Hello,
syzbot found the following issue on:
HEAD commit: 90d35da658da Linux 6.8-rc7
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=122f6f6a180000
kernel config: https://syzkaller.appspot.com/x/.config?x=119d08814b43915b
dashboard link: https://syzkaller.appspot.com/bug?extid=360faf5c01a5be55581d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124056de180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fb2c1adf4ec3/disk-90d35da6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/09c5b88a8ceb/vmlinux-90d35da6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5e5cbc312e49/bzImage-90d35da6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
1-....
} 4831 jiffies s: 1849 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
kthread+0x2ef/0x390 kernel/kthread.c:388
NMI backtrace for cpu 1
CPU: 1 PID: 5232 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:format_decode+0x546/0x1bb0
Code: 85 96 01 00 00 45 84 ff 0f 84 8d 01 00 00 48 bb 00 ff ff ff 00 ff ff ff 48 8b 44 24 20 42 0f b6 04 30 84 c0 0f 85 4d 10 00 00 <48> 8b 54 24 48 48 21 da 48 8b 44 24 28 42 0f b6 04 30 84 c0 48 8d
RSP: 0000:ffffc900001efa20 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffff00ffffff00 RCX: ffff8880219e0000
RDX: ffff8880219e0000 RSI: 0000000000000025 RDI: 0000000000000000
RBP: ffffc900001efb10 R08: ffffffff8b57a4c8 R09: ffffffff8b57a1aa
R10: 0000000000000002 R11: ffff8880219e0000 R12: ffffffff8bab75e6
R13: ffffffff8bab75e6 R14: dffffc0000000000 R15: 0000000000000025
FS: 0000555555c82480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f74dc087056 CR3: 0000000021bc6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>
vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
sprintf+0xda/0x120 lib/vsprintf.c:3028
print_time kernel/printk/printk.c:1324 [inline]
info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1350
record_print_text kernel/printk/printk.c:1399 [inline]
printk_get_next_message+0x408/0xce0 kernel/printk/printk.c:2828
console_emit_next_record kernel/printk/printk.c:2868 [inline]
console_flush_all+0x42d/0xec0 kernel/printk/printk.c:2967
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036
vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303
_printk+0xd5/0x120 kernel/printk/printk.c:2328
printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
show_trace_log_lvl+0x438/0x520 arch/x86/kernel/dumpstack.c:285
sched_show_task+0x50c/0x6d0 kernel/sched/core.c:9171
show_state_filter+0x19e/0x270 kernel/sched/core.c:9216
kbd_keycode drivers/tty/vt/keyboard.c:1524 [inline]
kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1543
input_to_handler drivers/input/input.c:132 [inline]
input_pass_values+0x945/0x1200 drivers/input/input.c:161
input_event_dispose drivers/input/input.c:378 [inline]
input_handle_event drivers/input/input.c:406 [inline]
input_repeat_key+0x3fd/0x6c0 drivers/input/input.c:2263
call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1751 [inline]
__run_timers+0x621/0x830 kernel/time/timer.c:2038
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051
__do_softirq+0x2bb/0x942 kernel/softirq.c:553
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:page_table_check_set+0x58/0x700 mm/page_table_check.c:109
Code: 95 ff 85 ed 0f 84 5f 03 00 00 49 bf 00 00 00 00 00 fc ff df 48 c1 e3 06 48 bd 00 00 00 00 00 ea ff ff 48 8d 3c 2b 48 89 3c 24 <e8> 33 e9 ff ff 49 89 c6 4c 8d 64 2b 08 4c 89 e5 48 c1 ed 03 42 80
RSP: 0000:ffffc90004d0f650 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000001c8ae80 RCX: ffff8880219e0000
RDX: ffff8880219e0000 RSI: 0000000000000001 RDI: ffffea0001c8ae80
RBP: ffffea0000000000 R08: ffffffff81fdf590 R09: 1ffffffff1f0880d
R10: dffffc0000000000 R11: fffffbfff1f0880e R12: 0000000000000000
R13: 0000000000000001 R14: 00000000722ba025 R15: dffffc0000000000
__page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
set_ptes include/linux/pgtable.h:241 [inline]
set_pte_range+0x885/0x8b0 mm/memory.c:4549
filemap_map_order0_folio mm/filemap.c:3513 [inline]
filemap_map_pages+0xee2/0x1830 mm/filemap.c:3559
do_fault_around mm/memory.c:4716 [inline]
do_read_fault mm/memory.c:4749 [inline]
do_fault mm/memory.c:4888 [inline]
do_pte_missing mm/memory.c:3745 [inline]
handle_pte_fault mm/memory.c:5164 [inline]
__handle_mm_fault+0x485d/0x72d0 mm/memory.c:5305
handle_mm_fault+0x27e/0x770 mm/memory.c:5470
do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
handle_page_fault arch/x86/mm/fault.c:1498 [inline]
exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1554
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f74dc087080
Code: Unable to access opcode bytes at 0x7f74dc087056.
RSP: 002b:00007ffe028d3bb8 EFLAGS: 00010246
RAX: 00007f74dcdfb9d0 RBX: 00007f74dcdfb6c0 RCX: 00007f74dc07de67
RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f74dcdfb6c0
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffe028d3e60
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
</TASK>
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
</TASK>
task:kworker/u4:0 state:I stack:24400 pid:11 tgid:11 ppid:2 flags:0x00004000
Workqueue: 0x0 (events_unbound)
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
</TASK>
task:kworker/u4:1 state:I stack:23344 pid:12 tgid:12 ppid:2 flags:0x00004000
Workqueue: 0x0 (bat_events)
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
</TASK>
task:kworker/R-mm_pe state:I stack:28752 pid:13 tgid:13 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
</TASK>
task:rcu_tasks_kthre state:I stack:27448 pid:14 tgid:14 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
</TASK>
task:rcu_tasks_trace state:I stack:27144 pid:15 tgid:15 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
</TASK>
task:ksoftirqd/0
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email protected].
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 90d35da658da Linux 6.8-rc7
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=122f6f6a180000
> kernel config: https://syzkaller.appspot.com/x/.config?x=119d08814b43915b
> dashboard link: https://syzkaller.appspot.com/bug?extid=360faf5c01a5be55581d
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124056de180000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/fb2c1adf4ec3/disk-90d35da6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/09c5b88a8ceb/vmlinux-90d35da6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/5e5cbc312e49/bzImage-90d35da6.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
master
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7019a40457a6..69e344f07e68 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9233,6 +9233,7 @@ void show_state_filter(unsigned int state_filter)
*/
touch_nmi_watchdog();
touch_all_softlockup_watchdogs();
+ rcu_cpu_stall_reset();
if (state_filter_match(state_filter, p))
sched_show_task(p);
}
>
> rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
> 1-....
> } 4831 jiffies s: 1849 root: 0x2/.
> rcu: blocking rcu_node structures (internal RCU debug):
> Sending NMI from CPU 0 to CPUs 1:
> kthread+0x2ef/0x390 kernel/kthread.c:388
> NMI backtrace for cpu 1
> CPU: 1 PID: 5232 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
> RIP: 0010:format_decode+0x546/0x1bb0
> Code: 85 96 01 00 00 45 84 ff 0f 84 8d 01 00 00 48 bb 00 ff ff ff 00 ff ff ff 48 8b 44 24 20 42 0f b6 04 30 84 c0 0f 85 4d 10 00 00 <48> 8b 54 24 48 48 21 da 48 8b 44 24 28 42 0f b6 04 30 84 c0 48 8d
> RSP: 0000:ffffc900001efa20 EFLAGS: 00000046
> RAX: 0000000000000000 RBX: ffffff00ffffff00 RCX: ffff8880219e0000
> RDX: ffff8880219e0000 RSI: 0000000000000025 RDI: 0000000000000000
> RBP: ffffc900001efb10 R08: ffffffff8b57a4c8 R09: ffffffff8b57a1aa
> R10: 0000000000000002 R11: ffff8880219e0000 R12: ffffffff8bab75e6
> R13: ffffffff8bab75e6 R14: dffffc0000000000 R15: 0000000000000025
> FS: 0000555555c82480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f74dc087056 CR3: 0000000021bc6000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <NMI>
> </NMI>
> <IRQ>
> vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
> sprintf+0xda/0x120 lib/vsprintf.c:3028
> print_time kernel/printk/printk.c:1324 [inline]
> info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1350
> record_print_text kernel/printk/printk.c:1399 [inline]
> printk_get_next_message+0x408/0xce0 kernel/printk/printk.c:2828
> console_emit_next_record kernel/printk/printk.c:2868 [inline]
> console_flush_all+0x42d/0xec0 kernel/printk/printk.c:2967
> console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036
> vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303
> _printk+0xd5/0x120 kernel/printk/printk.c:2328
> printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
> show_trace_log_lvl+0x438/0x520 arch/x86/kernel/dumpstack.c:285
> sched_show_task+0x50c/0x6d0 kernel/sched/core.c:9171
> show_state_filter+0x19e/0x270 kernel/sched/core.c:9216
> kbd_keycode drivers/tty/vt/keyboard.c:1524 [inline]
> kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1543
> input_to_handler drivers/input/input.c:132 [inline]
> input_pass_values+0x945/0x1200 drivers/input/input.c:161
> input_event_dispose drivers/input/input.c:378 [inline]
> input_handle_event drivers/input/input.c:406 [inline]
> input_repeat_key+0x3fd/0x6c0 drivers/input/input.c:2263
> call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700
> expire_timers kernel/time/timer.c:1751 [inline]
> __run_timers+0x621/0x830 kernel/time/timer.c:2038
> run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051
> __do_softirq+0x2bb/0x942 kernel/softirq.c:553
> invoke_softirq kernel/softirq.c:427 [inline]
> __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
> irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
> sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
> </IRQ>
> <TASK>
> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
> RIP: 0010:page_table_check_set+0x58/0x700 mm/page_table_check.c:109
> Code: 95 ff 85 ed 0f 84 5f 03 00 00 49 bf 00 00 00 00 00 fc ff df 48 c1 e3 06 48 bd 00 00 00 00 00 ea ff ff 48 8d 3c 2b 48 89 3c 24 <e8> 33 e9 ff ff 49 89 c6 4c 8d 64 2b 08 4c 89 e5 48 c1 ed 03 42 80
> RSP: 0000:ffffc90004d0f650 EFLAGS: 00000202
> RAX: 0000000000000000 RBX: 0000000001c8ae80 RCX: ffff8880219e0000
> RDX: ffff8880219e0000 RSI: 0000000000000001 RDI: ffffea0001c8ae80
> RBP: ffffea0000000000 R08: ffffffff81fdf590 R09: 1ffffffff1f0880d
> R10: dffffc0000000000 R11: fffffbfff1f0880e R12: 0000000000000000
> R13: 0000000000000001 R14: 00000000722ba025 R15: dffffc0000000000
> __page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
> page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
> set_ptes include/linux/pgtable.h:241 [inline]
> set_pte_range+0x885/0x8b0 mm/memory.c:4549
> filemap_map_order0_folio mm/filemap.c:3513 [inline]
> filemap_map_pages+0xee2/0x1830 mm/filemap.c:3559
> do_fault_around mm/memory.c:4716 [inline]
> do_read_fault mm/memory.c:4749 [inline]
> do_fault mm/memory.c:4888 [inline]
> do_pte_missing mm/memory.c:3745 [inline]
> handle_pte_fault mm/memory.c:5164 [inline]
> __handle_mm_fault+0x485d/0x72d0 mm/memory.c:5305
> handle_mm_fault+0x27e/0x770 mm/memory.c:5470
> do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
> handle_page_fault arch/x86/mm/fault.c:1498 [inline]
> exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1554
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
> RIP: 0033:0x7f74dc087080
> Code: Unable to access opcode bytes at 0x7f74dc087056.
> RSP: 002b:00007ffe028d3bb8 EFLAGS: 00010246
> RAX: 00007f74dcdfb9d0 RBX: 00007f74dcdfb6c0 RCX: 00007f74dc07de67
> RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f74dcdfb6c0
> RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
> R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffe028d3e60
> R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
> </TASK>
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:kworker/u4:0 state:I stack:24400 pid:11 tgid:11 ppid:2 flags:0x00004000
> Workqueue: 0x0 (events_unbound)
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:kworker/u4:1 state:I stack:23344 pid:12 tgid:12 ppid:2 flags:0x00004000
> Workqueue: 0x0 (bat_events)
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:kworker/R-mm_pe state:I stack:28752 pid:13 tgid:13 ppid:2 flags:0x00004000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:rcu_tasks_kthre state:I stack:27448 pid:14 tgid:14 ppid:2 flags:0x00004000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:rcu_tasks_trace state:I stack:27144 pid:15 tgid:15 ppid:2 flags:0x00004000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:ksoftirqd/0
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at [email protected].
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
>>
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: 90d35da658da Linux 6.8-rc7
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=122f6f6a180000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=119d08814b43915b
>> dashboard link: https://syzkaller.appspot.com/bug?extid=360faf5c01a5be55581d
>> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124056de180000
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/fb2c1adf4ec3/disk-90d35da6.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/09c5b88a8ceb/vmlinux-90d35da6.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/5e5cbc312e49/bzImage-90d35da6.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: [email protected]
>
>
> #syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
want either no args or 2 args (repo, branch), got 1
> master
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 7019a40457a6..69e344f07e68 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -9233,6 +9233,7 @@ void show_state_filter(unsigned int state_filter)
> */
> touch_nmi_watchdog();
> touch_all_softlockup_watchdogs();
> + rcu_cpu_stall_reset();
> if (state_filter_match(state_filter, p))
> sched_show_task(p);
>
> }
>
>
>>
>> rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
>> 1-....
>> } 4831 jiffies s: 1849 root: 0x2/.
>> rcu: blocking rcu_node structures (internal RCU debug):
>> Sending NMI from CPU 0 to CPUs 1:
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> NMI backtrace for cpu 1
>> CPU: 1 PID: 5232 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
>> RIP: 0010:format_decode+0x546/0x1bb0
>> Code: 85 96 01 00 00 45 84 ff 0f 84 8d 01 00 00 48 bb 00 ff ff ff 00 ff ff ff 48 8b 44 24 20 42 0f b6 04 30 84 c0 0f 85 4d 10 00 00 <48> 8b 54 24 48 48 21 da 48 8b 44 24 28 42 0f b6 04 30 84 c0 48 8d
>> RSP: 0000:ffffc900001efa20 EFLAGS: 00000046
>> RAX: 0000000000000000 RBX: ffffff00ffffff00 RCX: ffff8880219e0000
>> RDX: ffff8880219e0000 RSI: 0000000000000025 RDI: 0000000000000000
>> RBP: ffffc900001efb10 R08: ffffffff8b57a4c8 R09: ffffffff8b57a1aa
>> R10: 0000000000000002 R11: ffff8880219e0000 R12: ffffffff8bab75e6
>> R13: ffffffff8bab75e6 R14: dffffc0000000000 R15: 0000000000000025
>> FS: 0000555555c82480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 00007f74dc087056 CR3: 0000000021bc6000 CR4: 00000000003506f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>> <NMI>
>> </NMI>
>> <IRQ>
>> vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
>> sprintf+0xda/0x120 lib/vsprintf.c:3028
>> print_time kernel/printk/printk.c:1324 [inline]
>> info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1350
>> record_print_text kernel/printk/printk.c:1399 [inline]
>> printk_get_next_message+0x408/0xce0 kernel/printk/printk.c:2828
>> console_emit_next_record kernel/printk/printk.c:2868 [inline]
>> console_flush_all+0x42d/0xec0 kernel/printk/printk.c:2967
>> console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036
>> vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303
>> _printk+0xd5/0x120 kernel/printk/printk.c:2328
>> printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
>> show_trace_log_lvl+0x438/0x520 arch/x86/kernel/dumpstack.c:285
>> sched_show_task+0x50c/0x6d0 kernel/sched/core.c:9171
>> show_state_filter+0x19e/0x270 kernel/sched/core.c:9216
>> kbd_keycode drivers/tty/vt/keyboard.c:1524 [inline]
>> kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1543
>> input_to_handler drivers/input/input.c:132 [inline]
>> input_pass_values+0x945/0x1200 drivers/input/input.c:161
>> input_event_dispose drivers/input/input.c:378 [inline]
>> input_handle_event drivers/input/input.c:406 [inline]
>> input_repeat_key+0x3fd/0x6c0 drivers/input/input.c:2263
>> call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700
>> expire_timers kernel/time/timer.c:1751 [inline]
>> __run_timers+0x621/0x830 kernel/time/timer.c:2038
>> run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051
>> __do_softirq+0x2bb/0x942 kernel/softirq.c:553
>> invoke_softirq kernel/softirq.c:427 [inline]
>> __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
>> irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
>> sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
>> </IRQ>
>> <TASK>
>> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
>> RIP: 0010:page_table_check_set+0x58/0x700 mm/page_table_check.c:109
>> Code: 95 ff 85 ed 0f 84 5f 03 00 00 49 bf 00 00 00 00 00 fc ff df 48 c1 e3 06 48 bd 00 00 00 00 00 ea ff ff 48 8d 3c 2b 48 89 3c 24 <e8> 33 e9 ff ff 49 89 c6 4c 8d 64 2b 08 4c 89 e5 48 c1 ed 03 42 80
>> RSP: 0000:ffffc90004d0f650 EFLAGS: 00000202
>> RAX: 0000000000000000 RBX: 0000000001c8ae80 RCX: ffff8880219e0000
>> RDX: ffff8880219e0000 RSI: 0000000000000001 RDI: ffffea0001c8ae80
>> RBP: ffffea0000000000 R08: ffffffff81fdf590 R09: 1ffffffff1f0880d
>> R10: dffffc0000000000 R11: fffffbfff1f0880e R12: 0000000000000000
>> R13: 0000000000000001 R14: 00000000722ba025 R15: dffffc0000000000
>> __page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
>> page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
>> set_ptes include/linux/pgtable.h:241 [inline]
>> set_pte_range+0x885/0x8b0 mm/memory.c:4549
>> filemap_map_order0_folio mm/filemap.c:3513 [inline]
>> filemap_map_pages+0xee2/0x1830 mm/filemap.c:3559
>> do_fault_around mm/memory.c:4716 [inline]
>> do_read_fault mm/memory.c:4749 [inline]
>> do_fault mm/memory.c:4888 [inline]
>> do_pte_missing mm/memory.c:3745 [inline]
>> handle_pte_fault mm/memory.c:5164 [inline]
>> __handle_mm_fault+0x485d/0x72d0 mm/memory.c:5305
>> handle_mm_fault+0x27e/0x770 mm/memory.c:5470
>> do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
>> handle_page_fault arch/x86/mm/fault.c:1498 [inline]
>> exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1554
>> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
>> RIP: 0033:0x7f74dc087080
>> Code: Unable to access opcode bytes at 0x7f74dc087056.
>> RSP: 002b:00007ffe028d3bb8 EFLAGS: 00010246
>> RAX: 00007f74dcdfb9d0 RBX: 00007f74dcdfb6c0 RCX: 00007f74dc07de67
>> RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f74dcdfb6c0
>> RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
>> R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffe028d3e60
>> R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
>> </TASK>
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:kworker/u4:0 state:I stack:24400 pid:11 tgid:11 ppid:2 flags:0x00004000
>> Workqueue: 0x0 (events_unbound)
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:kworker/u4:1 state:I stack:23344 pid:12 tgid:12 ppid:2 flags:0x00004000
>> Workqueue: 0x0 (bat_events)
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:kworker/R-mm_pe state:I stack:28752 pid:13 tgid:13 ppid:2 flags:0x00004000
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:rcu_tasks_kthre state:I stack:27448 pid:14 tgid:14 ppid:2 flags:0x00004000
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
>> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:rcu_tasks_trace state:I stack:27144 pid:15 tgid:15 ppid:2 flags:0x00004000
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
>> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:ksoftirqd/0
>>
>>
>> ---
>> This report is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at [email protected].
>>
>> syzbot will keep track of this issue. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>>
>> If the report is already addressed, let syzbot know by replying with:
>> #syz fix: exact-commit-title
>>
>> If you want syzbot to run the reproducer, reply with:
>> #syz test: git://repo/address.git branch-or-commit-hash
>> If you attach or paste a git patch, syzbot will apply it before testing.
>>
>> If you want to overwrite report's subsystems, reply with:
>> #syz set subsystems: new-subsystem
>> (See the list of subsystem names on the web dashboard)
>>
>> If the report is a duplicate of another one, reply with:
>> #syz dup: exact-subject-of-another-report
>>
>> If you want to undo deduplication, reply with:
>> #syz undup
>>
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 90d35da658da Linux 6.8-rc7
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=122f6f6a180000
> kernel config: https://syzkaller.appspot.com/x/.config?x=119d08814b43915b
> dashboard link: https://syzkaller.appspot.com/bug?extid=360faf5c01a5be55581d
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124056de180000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/fb2c1adf4ec3/disk-90d35da6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/09c5b88a8ceb/vmlinux-90d35da6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/5e5cbc312e49/bzImage-90d35da6.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
master
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7019a40457a6..69e344f07e68 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9233,6 +9233,7 @@ void show_state_filter(unsigned int state_filter)
*/
touch_nmi_watchdog();
touch_all_softlockup_watchdogs();
+ rcu_cpu_stall_reset();
if (state_filter_match(state_filter, p))
sched_show_task(p);
}
>
> rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
> 1-....
> } 4831 jiffies s: 1849 root: 0x2/.
> rcu: blocking rcu_node structures (internal RCU debug):
> Sending NMI from CPU 0 to CPUs 1:
> kthread+0x2ef/0x390 kernel/kthread.c:388
> NMI backtrace for cpu 1
> CPU: 1 PID: 5232 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
> RIP: 0010:format_decode+0x546/0x1bb0
> Code: 85 96 01 00 00 45 84 ff 0f 84 8d 01 00 00 48 bb 00 ff ff ff 00 ff ff ff 48 8b 44 24 20 42 0f b6 04 30 84 c0 0f 85 4d 10 00 00 <48> 8b 54 24 48 48 21 da 48 8b 44 24 28 42 0f b6 04 30 84 c0 48 8d
> RSP: 0000:ffffc900001efa20 EFLAGS: 00000046
> RAX: 0000000000000000 RBX: ffffff00ffffff00 RCX: ffff8880219e0000
> RDX: ffff8880219e0000 RSI: 0000000000000025 RDI: 0000000000000000
> RBP: ffffc900001efb10 R08: ffffffff8b57a4c8 R09: ffffffff8b57a1aa
> R10: 0000000000000002 R11: ffff8880219e0000 R12: ffffffff8bab75e6
> R13: ffffffff8bab75e6 R14: dffffc0000000000 R15: 0000000000000025
> FS: 0000555555c82480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f74dc087056 CR3: 0000000021bc6000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <NMI>
> </NMI>
> <IRQ>
> vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
> sprintf+0xda/0x120 lib/vsprintf.c:3028
> print_time kernel/printk/printk.c:1324 [inline]
> info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1350
> record_print_text kernel/printk/printk.c:1399 [inline]
> printk_get_next_message+0x408/0xce0 kernel/printk/printk.c:2828
> console_emit_next_record kernel/printk/printk.c:2868 [inline]
> console_flush_all+0x42d/0xec0 kernel/printk/printk.c:2967
> console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036
> vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303
> _printk+0xd5/0x120 kernel/printk/printk.c:2328
> printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
> show_trace_log_lvl+0x438/0x520 arch/x86/kernel/dumpstack.c:285
> sched_show_task+0x50c/0x6d0 kernel/sched/core.c:9171
> show_state_filter+0x19e/0x270 kernel/sched/core.c:9216
> kbd_keycode drivers/tty/vt/keyboard.c:1524 [inline]
> kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1543
> input_to_handler drivers/input/input.c:132 [inline]
> input_pass_values+0x945/0x1200 drivers/input/input.c:161
> input_event_dispose drivers/input/input.c:378 [inline]
> input_handle_event drivers/input/input.c:406 [inline]
> input_repeat_key+0x3fd/0x6c0 drivers/input/input.c:2263
> call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700
> expire_timers kernel/time/timer.c:1751 [inline]
> __run_timers+0x621/0x830 kernel/time/timer.c:2038
> run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051
> __do_softirq+0x2bb/0x942 kernel/softirq.c:553
> invoke_softirq kernel/softirq.c:427 [inline]
> __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
> irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
> sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
> </IRQ>
> <TASK>
> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
> RIP: 0010:page_table_check_set+0x58/0x700 mm/page_table_check.c:109
> Code: 95 ff 85 ed 0f 84 5f 03 00 00 49 bf 00 00 00 00 00 fc ff df 48 c1 e3 06 48 bd 00 00 00 00 00 ea ff ff 48 8d 3c 2b 48 89 3c 24 <e8> 33 e9 ff ff 49 89 c6 4c 8d 64 2b 08 4c 89 e5 48 c1 ed 03 42 80
> RSP: 0000:ffffc90004d0f650 EFLAGS: 00000202
> RAX: 0000000000000000 RBX: 0000000001c8ae80 RCX: ffff8880219e0000
> RDX: ffff8880219e0000 RSI: 0000000000000001 RDI: ffffea0001c8ae80
> RBP: ffffea0000000000 R08: ffffffff81fdf590 R09: 1ffffffff1f0880d
> R10: dffffc0000000000 R11: fffffbfff1f0880e R12: 0000000000000000
> R13: 0000000000000001 R14: 00000000722ba025 R15: dffffc0000000000
> __page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
> page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
> set_ptes include/linux/pgtable.h:241 [inline]
> set_pte_range+0x885/0x8b0 mm/memory.c:4549
> filemap_map_order0_folio mm/filemap.c:3513 [inline]
> filemap_map_pages+0xee2/0x1830 mm/filemap.c:3559
> do_fault_around mm/memory.c:4716 [inline]
> do_read_fault mm/memory.c:4749 [inline]
> do_fault mm/memory.c:4888 [inline]
> do_pte_missing mm/memory.c:3745 [inline]
> handle_pte_fault mm/memory.c:5164 [inline]
> __handle_mm_fault+0x485d/0x72d0 mm/memory.c:5305
> handle_mm_fault+0x27e/0x770 mm/memory.c:5470
> do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
> handle_page_fault arch/x86/mm/fault.c:1498 [inline]
> exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1554
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
> RIP: 0033:0x7f74dc087080
> Code: Unable to access opcode bytes at 0x7f74dc087056.
> RSP: 002b:00007ffe028d3bb8 EFLAGS: 00010246
> RAX: 00007f74dcdfb9d0 RBX: 00007f74dcdfb6c0 RCX: 00007f74dc07de67
> RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f74dcdfb6c0
> RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
> R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffe028d3e60
> R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
> </TASK>
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:kworker/u4:0 state:I stack:24400 pid:11 tgid:11 ppid:2 flags:0x00004000
> Workqueue: 0x0 (events_unbound)
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:kworker/u4:1 state:I stack:23344 pid:12 tgid:12 ppid:2 flags:0x00004000
> Workqueue: 0x0 (bat_events)
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:kworker/R-mm_pe state:I stack:28752 pid:13 tgid:13 ppid:2 flags:0x00004000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:rcu_tasks_kthre state:I stack:27448 pid:14 tgid:14 ppid:2 flags:0x00004000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:rcu_tasks_trace state:I stack:27144 pid:15 tgid:15 ppid:2 flags:0x00004000
> Call Trace:
> <TASK>
> context_switch kernel/sched/core.c:5400 [inline]
> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> __schedule_loop kernel/sched/core.c:6802 [inline]
> schedule+0x149/0x260 kernel/sched/core.c:6817
> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
> kthread+0x2ef/0x390 kernel/kthread.c:388
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> </TASK>
> task:ksoftirqd/0
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at [email protected].
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
>>
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: 90d35da658da Linux 6.8-rc7
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=122f6f6a180000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=119d08814b43915b
>> dashboard link: https://syzkaller.appspot.com/bug?extid=360faf5c01a5be55581d
>> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124056de180000
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/fb2c1adf4ec3/disk-90d35da6.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/09c5b88a8ceb/vmlinux-90d35da6.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/5e5cbc312e49/bzImage-90d35da6.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: [email protected]
>
> #syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
want either no args or 2 args (repo, branch), got 1
> master
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 7019a40457a6..69e344f07e68 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -9233,6 +9233,7 @@ void show_state_filter(unsigned int state_filter)
> */
> touch_nmi_watchdog();
> touch_all_softlockup_watchdogs();
> + rcu_cpu_stall_reset();
> if (state_filter_match(state_filter, p))
> sched_show_task(p);
> }
>
>
>
>
>>
>> rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
>> 1-....
>> } 4831 jiffies s: 1849 root: 0x2/.
>> rcu: blocking rcu_node structures (internal RCU debug):
>> Sending NMI from CPU 0 to CPUs 1:
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> NMI backtrace for cpu 1
>> CPU: 1 PID: 5232 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
>> RIP: 0010:format_decode+0x546/0x1bb0
>> Code: 85 96 01 00 00 45 84 ff 0f 84 8d 01 00 00 48 bb 00 ff ff ff 00 ff ff ff 48 8b 44 24 20 42 0f b6 04 30 84 c0 0f 85 4d 10 00 00 <48> 8b 54 24 48 48 21 da 48 8b 44 24 28 42 0f b6 04 30 84 c0 48 8d
>> RSP: 0000:ffffc900001efa20 EFLAGS: 00000046
>> RAX: 0000000000000000 RBX: ffffff00ffffff00 RCX: ffff8880219e0000
>> RDX: ffff8880219e0000 RSI: 0000000000000025 RDI: 0000000000000000
>> RBP: ffffc900001efb10 R08: ffffffff8b57a4c8 R09: ffffffff8b57a1aa
>> R10: 0000000000000002 R11: ffff8880219e0000 R12: ffffffff8bab75e6
>> R13: ffffffff8bab75e6 R14: dffffc0000000000 R15: 0000000000000025
>> FS: 0000555555c82480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 00007f74dc087056 CR3: 0000000021bc6000 CR4: 00000000003506f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>> <NMI>
>> </NMI>
>> <IRQ>
>> vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
>> sprintf+0xda/0x120 lib/vsprintf.c:3028
>> print_time kernel/printk/printk.c:1324 [inline]
>> info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1350
>> record_print_text kernel/printk/printk.c:1399 [inline]
>> printk_get_next_message+0x408/0xce0 kernel/printk/printk.c:2828
>> console_emit_next_record kernel/printk/printk.c:2868 [inline]
>> console_flush_all+0x42d/0xec0 kernel/printk/printk.c:2967
>> console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036
>> vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303
>> _printk+0xd5/0x120 kernel/printk/printk.c:2328
>> printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
>> show_trace_log_lvl+0x438/0x520 arch/x86/kernel/dumpstack.c:285
>> sched_show_task+0x50c/0x6d0 kernel/sched/core.c:9171
>> show_state_filter+0x19e/0x270 kernel/sched/core.c:9216
>> kbd_keycode drivers/tty/vt/keyboard.c:1524 [inline]
>> kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1543
>> input_to_handler drivers/input/input.c:132 [inline]
>> input_pass_values+0x945/0x1200 drivers/input/input.c:161
>> input_event_dispose drivers/input/input.c:378 [inline]
>> input_handle_event drivers/input/input.c:406 [inline]
>> input_repeat_key+0x3fd/0x6c0 drivers/input/input.c:2263
>> call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700
>> expire_timers kernel/time/timer.c:1751 [inline]
>> __run_timers+0x621/0x830 kernel/time/timer.c:2038
>> run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051
>> __do_softirq+0x2bb/0x942 kernel/softirq.c:553
>> invoke_softirq kernel/softirq.c:427 [inline]
>> __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
>> irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
>> sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
>> </IRQ>
>> <TASK>
>> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
>> RIP: 0010:page_table_check_set+0x58/0x700 mm/page_table_check.c:109
>> Code: 95 ff 85 ed 0f 84 5f 03 00 00 49 bf 00 00 00 00 00 fc ff df 48 c1 e3 06 48 bd 00 00 00 00 00 ea ff ff 48 8d 3c 2b 48 89 3c 24 <e8> 33 e9 ff ff 49 89 c6 4c 8d 64 2b 08 4c 89 e5 48 c1 ed 03 42 80
>> RSP: 0000:ffffc90004d0f650 EFLAGS: 00000202
>> RAX: 0000000000000000 RBX: 0000000001c8ae80 RCX: ffff8880219e0000
>> RDX: ffff8880219e0000 RSI: 0000000000000001 RDI: ffffea0001c8ae80
>> RBP: ffffea0000000000 R08: ffffffff81fdf590 R09: 1ffffffff1f0880d
>> R10: dffffc0000000000 R11: fffffbfff1f0880e R12: 0000000000000000
>> R13: 0000000000000001 R14: 00000000722ba025 R15: dffffc0000000000
>> __page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
>> page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
>> set_ptes include/linux/pgtable.h:241 [inline]
>> set_pte_range+0x885/0x8b0 mm/memory.c:4549
>> filemap_map_order0_folio mm/filemap.c:3513 [inline]
>> filemap_map_pages+0xee2/0x1830 mm/filemap.c:3559
>> do_fault_around mm/memory.c:4716 [inline]
>> do_read_fault mm/memory.c:4749 [inline]
>> do_fault mm/memory.c:4888 [inline]
>> do_pte_missing mm/memory.c:3745 [inline]
>> handle_pte_fault mm/memory.c:5164 [inline]
>> __handle_mm_fault+0x485d/0x72d0 mm/memory.c:5305
>> handle_mm_fault+0x27e/0x770 mm/memory.c:5470
>> do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
>> handle_page_fault arch/x86/mm/fault.c:1498 [inline]
>> exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1554
>> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
>> RIP: 0033:0x7f74dc087080
>> Code: Unable to access opcode bytes at 0x7f74dc087056.
>> RSP: 002b:00007ffe028d3bb8 EFLAGS: 00010246
>> RAX: 00007f74dcdfb9d0 RBX: 00007f74dcdfb6c0 RCX: 00007f74dc07de67
>> RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f74dcdfb6c0
>> RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
>> R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffe028d3e60
>> R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
>> </TASK>
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:kworker/u4:0 state:I stack:24400 pid:11 tgid:11 ppid:2 flags:0x00004000
>> Workqueue: 0x0 (events_unbound)
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:kworker/u4:1 state:I stack:23344 pid:12 tgid:12 ppid:2 flags:0x00004000
>> Workqueue: 0x0 (bat_events)
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:kworker/R-mm_pe state:I stack:28752 pid:13 tgid:13 ppid:2 flags:0x00004000
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:rcu_tasks_kthre state:I stack:27448 pid:14 tgid:14 ppid:2 flags:0x00004000
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
>> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:rcu_tasks_trace state:I stack:27144 pid:15 tgid:15 ppid:2 flags:0x00004000
>> Call Trace:
>> <TASK>
>> context_switch kernel/sched/core.c:5400 [inline]
>> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> __schedule_loop kernel/sched/core.c:6802 [inline]
>> schedule+0x149/0x260 kernel/sched/core.c:6817
>> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
>> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
>> kthread+0x2ef/0x390 kernel/kthread.c:388
>> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> </TASK>
>> task:ksoftirqd/0
>>
>>
>> ---
>> This report is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at [email protected].
>>
>> syzbot will keep track of this issue. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>>
>> If the report is already addressed, let syzbot know by replying with:
>> #syz fix: exact-commit-title
>>
>> If you want syzbot to run the reproducer, reply with:
>> #syz test: git://repo/address.git branch-or-commit-hash
>> If you attach or paste a git patch, syzbot will apply it before testing.
>>
>> If you want to overwrite report's subsystems, reply with:
>> #syz set subsystems: new-subsystem
>> (See the list of subsystem names on the web dashboard)
>>
>> If the report is a duplicate of another one, reply with:
>> #syz dup: exact-subject-of-another-report
>>
>> If you want to undo deduplication, reply with:
>> #syz undup
>>
On Mon, Mar 11, 2024 at 10:15 AM syzbot
<[email protected]> wrote:
>
> >>
> >> Hello,
> >>
> >> syzbot found the following issue on:
> >>
> >> HEAD commit: 90d35da658da Linux 6.8-rc7
> >> git tree: upstream
> >> console output: https://syzkaller.appspot.com/x/log.txt?x=122f6f6a180000
> >> kernel config: https://syzkaller.appspot.com/x/.config?x=119d08814b43915b
> >> dashboard link: https://syzkaller.appspot.com/bug?extid=360faf5c01a5be55581d
> >> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124056de180000
> >>
> >> Downloadable assets:
> >> disk image: https://storage.googleapis.com/syzbot-assets/fb2c1adf4ec3/disk-90d35da6.raw.xz
> >> vmlinux: https://storage.googleapis.com/syzbot-assets/09c5b88a8ceb/vmlinux-90d35da6.xz
> >> kernel image: https://storage.googleapis.com/syzbot-assets/5e5cbc312e49/bzImage-90d35da6.xz
> >>
> >> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> >> Reported-by: [email protected]
> >
> > #syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
Please try to either put this whole command on one line or add : after
#syz test (as in the example at the bottom of the report), then syzbot
will parse the next line with the branch name as well.
--
Aleksandr
>
> want either no args or 2 args (repo, branch), got 1
>
> > master
> >
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index 7019a40457a6..69e344f07e68 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -9233,6 +9233,7 @@ void show_state_filter(unsigned int state_filter)
> > */
> > touch_nmi_watchdog();
> > touch_all_softlockup_watchdogs();
> > + rcu_cpu_stall_reset();
> > if (state_filter_match(state_filter, p))
> > sched_show_task(p);
> > }
> >
> >
> >
> >
> >>
> >> rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
> >> 1-....
> >> } 4831 jiffies s: 1849 root: 0x2/.
> >> rcu: blocking rcu_node structures (internal RCU debug):
> >> Sending NMI from CPU 0 to CPUs 1:
> >> kthread+0x2ef/0x390 kernel/kthread.c:388
> >> NMI backtrace for cpu 1
> >> CPU: 1 PID: 5232 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0
> >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
> >> RIP: 0010:format_decode+0x546/0x1bb0
> >> Code: 85 96 01 00 00 45 84 ff 0f 84 8d 01 00 00 48 bb 00 ff ff ff 00 ff ff ff 48 8b 44 24 20 42 0f b6 04 30 84 c0 0f 85 4d 10 00 00 <48> 8b 54 24 48 48 21 da 48 8b 44 24 28 42 0f b6 04 30 84 c0 48 8d
> >> RSP: 0000:ffffc900001efa20 EFLAGS: 00000046
> >> RAX: 0000000000000000 RBX: ffffff00ffffff00 RCX: ffff8880219e0000
> >> RDX: ffff8880219e0000 RSI: 0000000000000025 RDI: 0000000000000000
> >> RBP: ffffc900001efb10 R08: ffffffff8b57a4c8 R09: ffffffff8b57a1aa
> >> R10: 0000000000000002 R11: ffff8880219e0000 R12: ffffffff8bab75e6
> >> R13: ffffffff8bab75e6 R14: dffffc0000000000 R15: 0000000000000025
> >> FS: 0000555555c82480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
> >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >> CR2: 00007f74dc087056 CR3: 0000000021bc6000 CR4: 00000000003506f0
> >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> >> Call Trace:
> >> <NMI>
> >> </NMI>
> >> <IRQ>
> >> vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
> >> sprintf+0xda/0x120 lib/vsprintf.c:3028
> >> print_time kernel/printk/printk.c:1324 [inline]
> >> info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1350
> >> record_print_text kernel/printk/printk.c:1399 [inline]
> >> printk_get_next_message+0x408/0xce0 kernel/printk/printk.c:2828
> >> console_emit_next_record kernel/printk/printk.c:2868 [inline]
> >> console_flush_all+0x42d/0xec0 kernel/printk/printk.c:2967
> >> console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036
> >> vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303
> >> _printk+0xd5/0x120 kernel/printk/printk.c:2328
> >> printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
> >> show_trace_log_lvl+0x438/0x520 arch/x86/kernel/dumpstack.c:285
> >> sched_show_task+0x50c/0x6d0 kernel/sched/core.c:9171
> >> show_state_filter+0x19e/0x270 kernel/sched/core.c:9216
> >> kbd_keycode drivers/tty/vt/keyboard.c:1524 [inline]
> >> kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1543
> >> input_to_handler drivers/input/input.c:132 [inline]
> >> input_pass_values+0x945/0x1200 drivers/input/input.c:161
> >> input_event_dispose drivers/input/input.c:378 [inline]
> >> input_handle_event drivers/input/input.c:406 [inline]
> >> input_repeat_key+0x3fd/0x6c0 drivers/input/input.c:2263
> >> call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700
> >> expire_timers kernel/time/timer.c:1751 [inline]
> >> __run_timers+0x621/0x830 kernel/time/timer.c:2038
> >> run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051
> >> __do_softirq+0x2bb/0x942 kernel/softirq.c:553
> >> invoke_softirq kernel/softirq.c:427 [inline]
> >> __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
> >> irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
> >> sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
> >> </IRQ>
> >> <TASK>
> >> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
> >> RIP: 0010:page_table_check_set+0x58/0x700 mm/page_table_check.c:109
> >> Code: 95 ff 85 ed 0f 84 5f 03 00 00 49 bf 00 00 00 00 00 fc ff df 48 c1 e3 06 48 bd 00 00 00 00 00 ea ff ff 48 8d 3c 2b 48 89 3c 24 <e8> 33 e9 ff ff 49 89 c6 4c 8d 64 2b 08 4c 89 e5 48 c1 ed 03 42 80
> >> RSP: 0000:ffffc90004d0f650 EFLAGS: 00000202
> >> RAX: 0000000000000000 RBX: 0000000001c8ae80 RCX: ffff8880219e0000
> >> RDX: ffff8880219e0000 RSI: 0000000000000001 RDI: ffffea0001c8ae80
> >> RBP: ffffea0000000000 R08: ffffffff81fdf590 R09: 1ffffffff1f0880d
> >> R10: dffffc0000000000 R11: fffffbfff1f0880e R12: 0000000000000000
> >> R13: 0000000000000001 R14: 00000000722ba025 R15: dffffc0000000000
> >> __page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
> >> page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
> >> set_ptes include/linux/pgtable.h:241 [inline]
> >> set_pte_range+0x885/0x8b0 mm/memory.c:4549
> >> filemap_map_order0_folio mm/filemap.c:3513 [inline]
> >> filemap_map_pages+0xee2/0x1830 mm/filemap.c:3559
> >> do_fault_around mm/memory.c:4716 [inline]
> >> do_read_fault mm/memory.c:4749 [inline]
> >> do_fault mm/memory.c:4888 [inline]
> >> do_pte_missing mm/memory.c:3745 [inline]
> >> handle_pte_fault mm/memory.c:5164 [inline]
> >> __handle_mm_fault+0x485d/0x72d0 mm/memory.c:5305
> >> handle_mm_fault+0x27e/0x770 mm/memory.c:5470
> >> do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
> >> handle_page_fault arch/x86/mm/fault.c:1498 [inline]
> >> exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1554
> >> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
> >> RIP: 0033:0x7f74dc087080
> >> Code: Unable to access opcode bytes at 0x7f74dc087056.
> >> RSP: 002b:00007ffe028d3bb8 EFLAGS: 00010246
> >> RAX: 00007f74dcdfb9d0 RBX: 00007f74dcdfb6c0 RCX: 00007f74dc07de67
> >> RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f74dcdfb6c0
> >> RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
> >> R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffe028d3e60
> >> R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
> >> </TASK>
> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> >> </TASK>
> >> task:kworker/u4:0 state:I stack:24400 pid:11 tgid:11 ppid:2 flags:0x00004000
> >> Workqueue: 0x0 (events_unbound)
> >> Call Trace:
> >> <TASK>
> >> context_switch kernel/sched/core.c:5400 [inline]
> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> >> __schedule_loop kernel/sched/core.c:6802 [inline]
> >> schedule+0x149/0x260 kernel/sched/core.c:6817
> >> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
> >> kthread+0x2ef/0x390 kernel/kthread.c:388
> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> >> </TASK>
> >> task:kworker/u4:1 state:I stack:23344 pid:12 tgid:12 ppid:2 flags:0x00004000
> >> Workqueue: 0x0 (bat_events)
> >> Call Trace:
> >> <TASK>
> >> context_switch kernel/sched/core.c:5400 [inline]
> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> >> __schedule_loop kernel/sched/core.c:6802 [inline]
> >> schedule+0x149/0x260 kernel/sched/core.c:6817
> >> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
> >> kthread+0x2ef/0x390 kernel/kthread.c:388
> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> >> </TASK>
> >> task:kworker/R-mm_pe state:I stack:28752 pid:13 tgid:13 ppid:2 flags:0x00004000
> >> Call Trace:
> >> <TASK>
> >> context_switch kernel/sched/core.c:5400 [inline]
> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> >> __schedule_loop kernel/sched/core.c:6802 [inline]
> >> schedule+0x149/0x260 kernel/sched/core.c:6817
> >> rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937
> >> kthread+0x2ef/0x390 kernel/kthread.c:388
> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> >> </TASK>
> >> task:rcu_tasks_kthre state:I stack:27448 pid:14 tgid:14 ppid:2 flags:0x00004000
> >> Call Trace:
> >> <TASK>
> >> context_switch kernel/sched/core.c:5400 [inline]
> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> >> __schedule_loop kernel/sched/core.c:6802 [inline]
> >> schedule+0x149/0x260 kernel/sched/core.c:6817
> >> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
> >> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
> >> kthread+0x2ef/0x390 kernel/kthread.c:388
> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> >> </TASK>
> >> task:rcu_tasks_trace state:I stack:27144 pid:15 tgid:15 ppid:2 flags:0x00004000
> >> Call Trace:
> >> <TASK>
> >> context_switch kernel/sched/core.c:5400 [inline]
> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
> >> __schedule_loop kernel/sched/core.c:6802 [inline]
> >> schedule+0x149/0x260 kernel/sched/core.c:6817
> >> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
> >> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
> >> kthread+0x2ef/0x390 kernel/kthread.c:388
> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
> >> </TASK>
> >> task:ksoftirqd/0
> >>
> >>
> >> ---
> >> This report is generated by a bot. It may contain errors.
> >> See https://goo.gl/tpsmEJ for more information about syzbot.
> >> syzbot engineers can be reached at [email protected].
> >>
> >> syzbot will keep track of this issue. See:
> >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >>
> >> If the report is already addressed, let syzbot know by replying with:
> >> #syz fix: exact-commit-title
> >>
> >> If you want syzbot to run the reproducer, reply with:
> >> #syz test: git://repo/address.git branch-or-commit-hash
> >> If you attach or paste a git patch, syzbot will apply it before testing.
> >>
> >> If you want to overwrite report's subsystems, reply with:
> >> #syz set subsystems: new-subsystem
> >> (See the list of subsystem names on the web dashboard)
> >>
> >> If the report is a duplicate of another one, reply with:
> >> #syz dup: exact-subject-of-another-report
> >>
> >> If you want to undo deduplication, reply with:
> >> #syz undup
> >>
>
> --
> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000007d76cf06135efac5%40google.com.
> On Mon, Mar 11, 2024 at 10:15 AM syzbot
> <[email protected]> wrote:
>>
>> >>
>> >> Hello,
>> >>
>> >> syzbot found the following issue on:
>> >>
>> >> HEAD commit: 90d35da658da Linux 6.8-rc7
>> >> git tree: upstream
>> >> console output: https://syzkaller.appspot.com/x/log.txt?x=122f6f6a180000
>> >> kernel config: https://syzkaller.appspot.com/x/.config?x=119d08814b43915b
>> >> dashboard link: https://syzkaller.appspot.com/bug?extid=360faf5c01a5be55581d
>> >> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>> >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124056de180000
>> >>
>> >> Downloadable assets:
>> >> disk image: https://storage.googleapis.com/syzbot-assets/fb2c1adf4ec3/disk-90d35da6.raw.xz
>> >> vmlinux: https://storage.googleapis.com/syzbot-assets/09c5b88a8ceb/vmlinux-90d35da6.xz
>> >> kernel image: https://storage.googleapis.com/syzbot-assets/5e5cbc312e49/bzImage-90d35da6.xz
>> >>
>> >> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> >> Reported-by: [email protected]
>> >
>> > #syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>
> Please try to either put this whole command on one line or add : after
> #syz test (as in the example at the bottom of the report), then syzbot
want either no args or 2 args (repo, branch), got 12
> will parse the next line with the branch name as well.
>
> --
> Aleksandr
>
>>
>> want either no args or 2 args (repo, branch), got 1
>>
>> > master
>> >
>> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
>> > index 7019a40457a6..69e344f07e68 100644
>> > --- a/kernel/sched/core.c
>> > +++ b/kernel/sched/core.c
>> > @@ -9233,6 +9233,7 @@ void show_state_filter(unsigned int state_filter)
>> > */
>> > touch_nmi_watchdog();
>> > touch_all_softlockup_watchdogs();
>> > + rcu_cpu_stall_reset();
>> > if (state_filter_match(state_filter, p))
>> > sched_show_task(p);
>> > }
>> >
>> >
>> >
>> >
>> >>
>> >> rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
>> >> 1-....
>> >> } 4831 jiffies s: 1849 root: 0x2/.
>> >> rcu: blocking rcu_node structures (internal RCU debug):
>> >> Sending NMI from CPU 0 to CPUs 1:
>> >> kthread+0x2ef/0x390 kernel/kthread.c:388
>> >> NMI backtrace for cpu 1
>> >> CPU: 1 PID: 5232 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0
>> >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
>> >> RIP: 0010:format_decode+0x546/0x1bb0
>> >> Code: 85 96 01 00 00 45 84 ff 0f 84 8d 01 00 00 48 bb 00 ff ff ff 00 ff ff ff 48 8b 44 24 20 42 0f b6 04 30 84 c0 0f 85 4d 10 00 00 <48> 8b 54 24 48 48 21 da 48 8b 44 24 28 42 0f b6 04 30 84 c0 48 8d
>> >> RSP: 0000:ffffc900001efa20 EFLAGS: 00000046
>> >> RAX: 0000000000000000 RBX: ffffff00ffffff00 RCX: ffff8880219e0000
>> >> RDX: ffff8880219e0000 RSI: 0000000000000025 RDI: 0000000000000000
>> >> RBP: ffffc900001efb10 R08: ffffffff8b57a4c8 R09: ffffffff8b57a1aa
>> >> R10: 0000000000000002 R11: ffff8880219e0000 R12: ffffffff8bab75e6
>> >> R13: ffffffff8bab75e6 R14: dffffc0000000000 R15: 0000000000000025
>> >> FS: 0000555555c82480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
>> >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> >> CR2: 00007f74dc087056 CR3: 0000000021bc6000 CR4: 00000000003506f0
>> >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> >> Call Trace:
>> >> <NMI>
>> >> </NMI>
>> >> <IRQ>
>> >> vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
>> >> sprintf+0xda/0x120 lib/vsprintf.c:3028
>> >> print_time kernel/printk/printk.c:1324 [inline]
>> >> info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1350
>> >> record_print_text kernel/printk/printk.c:1399 [inline]
>> >> printk_get_next_message+0x408/0xce0 kernel/printk/printk.c:2828
>> >> console_emit_next_record kernel/printk/printk.c:2868 [inline]
>> >> console_flush_all+0x42d/0xec0 kernel/printk/printk.c:2967
>> >> console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036
>> >> vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303
>> >> _printk+0xd5/0x120 kernel/printk/printk.c:2328
>> >> printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
>> >> show_trace_log_lvl+0x438/0x520 arch/x86/kernel/dumpstack.c:285
>> >> sched_show_task+0x50c/0x6d0 kernel/sched/core.c:9171
>> >> show_state_filter+0x19e/0x270 kernel/sched/core.c:9216
>> >> kbd_keycode drivers/tty/vt/keyboard.c:1524 [inline]
>> >> kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1543
>> >> input_to_handler drivers/input/input.c:132 [inline]
>> >> input_pass_values+0x945/0x1200 drivers/input/input.c:161
>> >> input_event_dispose drivers/input/input.c:378 [inline]
>> >> input_handle_event drivers/input/input.c:406 [inline]
>> >> input_repeat_key+0x3fd/0x6c0 drivers/input/input.c:2263
>> >> call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700
>> >> expire_timers kernel/time/timer.c:1751 [inline]
>> >> __run_timers+0x621/0x830 kernel/time/timer.c:2038
>> >> run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051
>> >> __do_softirq+0x2bb/0x942 kernel/softirq.c:553
>> >> invoke_softirq kernel/softirq.c:427 [inline]
>> >> __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
>> >> irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
>> >> sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
>> >> </IRQ>
>> >> <TASK>
>> >> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
>> >> RIP: 0010:page_table_check_set+0x58/0x700 mm/page_table_check.c:109
>> >> Code: 95 ff 85 ed 0f 84 5f 03 00 00 49 bf 00 00 00 00 00 fc ff df 48 c1 e3 06 48 bd 00 00 00 00 00 ea ff ff 48 8d 3c 2b 48 89 3c 24 <e8> 33 e9 ff ff 49 89 c6 4c 8d 64 2b 08 4c 89 e5 48 c1 ed 03 42 80
>> >> RSP: 0000:ffffc90004d0f650 EFLAGS: 00000202
>> >> RAX: 0000000000000000 RBX: 0000000001c8ae80 RCX: ffff8880219e0000
>> >> RDX: ffff8880219e0000 RSI: 0000000000000001 RDI: ffffea0001c8ae80
>> >> RBP: ffffea0000000000 R08: ffffffff81fdf590 R09: 1ffffffff1f0880d
>> >> R10: dffffc0000000000 R11: fffffbfff1f0880e R12: 0000000000000000
>> >> R13: 0000000000000001 R14: 00000000722ba025 R15: dffffc0000000000
>> >> __page_table_check_ptes_set+0x220/0x280 mm/page_table_check.c:196
>> >> page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
>> >> set_ptes include/linux/pgtable.h:241 [inline]
>> >> set_pte_range+0x885/0x8b0 mm/memory.c:4549
>> >> filemap_map_order0_folio mm/filemap.c:3513 [inline]
>> >> filemap_map_pages+0xee2/0x1830 mm/filemap.c:3559
>> >> do_fault_around mm/memory.c:4716 [inline]
>> >> do_read_fault mm/memory.c:4749 [inline]
>> >> do_fault mm/memory.c:4888 [inline]
>> >> do_pte_missing mm/memory.c:3745 [inline]
>> >> handle_pte_fault mm/memory.c:5164 [inline]
>> >> __handle_mm_fault+0x485d/0x72d0 mm/memory.c:5305
>> >> handle_mm_fault+0x27e/0x770 mm/memory.c:5470
>> >> do_user_addr_fault arch/x86/mm/fault.c:1355 [inline]
>> >> handle_page_fault arch/x86/mm/fault.c:1498 [inline]
>> >> exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1554
>> >> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
>> >> RIP: 0033:0x7f74dc087080
>> >> Code: Unable to access opcode bytes at 0x7f74dc087056.
>> >> RSP: 002b:00007ffe028d3bb8 EFLAGS: 00010246
>> >> RAX: 00007f74dcdfb9d0 RBX: 00007f74dcdfb6c0 RCX: 00007f74dc07de67
>> >> RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f74dcdfb6c0
>> >> RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
>> >> R10: 0000000000021000 R11: 0000000000000206 R12: 00007ffe028d3e60
>> >> R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
>> >> </TASK>
>> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> >> </TASK>
>> >> task:kworker/u4:0 state:I stack:24400 pid:11 tgid:11 ppid:2 flags:0x00004000
>> >> Workqueue: 0x0 (events_unbound)
>> >> Call Trace:
>> >> <TASK>
>> >> context_switch kernel/sched/core.c:5400 [inline]
>> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> >> __schedule_loop kernel/sched/core.c:6802 [inline]
>> >> schedule+0x149/0x260 kernel/sched/core.c:6817
>> >> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
>> >> kthread+0x2ef/0x390 kernel/kthread.c:388
>> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> >> </TASK>
>> >> task:kworker/u4:1 state:I stack:23344 pid:12 tgid:12 ppid:2 flags:0x00004000
>> >> Workqueue: 0x0 (bat_events)
>> >> Call Trace:
>> >> <TASK>
>> >> context_switch kernel/sched/core.c:5400 [inline]
>> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> >> __schedule_loop kernel/sched/core.c:6802 [inline]
>> >> schedule+0x149/0x260 kernel/sched/core.c:6817
>> >> worker_thread+0xc26/0x1000 kernel/workqueue.c:2802
>> >> kthread+0x2ef/0x390 kernel/kthread.c:388
>> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> >> </TASK>
>> >> task:kworker/R-mm_pe state:I stack:28752 pid:13 tgid:13 ppid:2 flags:0x00004000
>> >> Call Trace:
>> >> <TASK>
>> >> context_switch kernel/sched/core.c:5400 [inline]
>> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> >> __schedule_loop kernel/sched/core.c:6802 [inline]
>> >> schedule+0x149/0x260 kernel/sched/core.c:6817
>> >> rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937
>> >> kthread+0x2ef/0x390 kernel/kthread.c:388
>> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> >> </TASK>
>> >> task:rcu_tasks_kthre state:I stack:27448 pid:14 tgid:14 ppid:2 flags:0x00004000
>> >> Call Trace:
>> >> <TASK>
>> >> context_switch kernel/sched/core.c:5400 [inline]
>> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> >> __schedule_loop kernel/sched/core.c:6802 [inline]
>> >> schedule+0x149/0x260 kernel/sched/core.c:6817
>> >> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
>> >> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
>> >> kthread+0x2ef/0x390 kernel/kthread.c:388
>> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> >> </TASK>
>> >> task:rcu_tasks_trace state:I stack:27144 pid:15 tgid:15 ppid:2 flags:0x00004000
>> >> Call Trace:
>> >> <TASK>
>> >> context_switch kernel/sched/core.c:5400 [inline]
>> >> __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
>> >> __schedule_loop kernel/sched/core.c:6802 [inline]
>> >> schedule+0x149/0x260 kernel/sched/core.c:6817
>> >> rcu_tasks_one_gp+0x7f5/0xda0 kernel/rcu/tasks.h:578
>> >> rcu_tasks_kthread+0x186/0x1b0 kernel/rcu/tasks.h:625
>> >> kthread+0x2ef/0x390 kernel/kthread.c:388
>> >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>> >> ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
>> >> </TASK>
>> >> task:ksoftirqd/0
>> >>
>> >>
>> >> ---
>> >> This report is generated by a bot. It may contain errors.
>> >> See https://goo.gl/tpsmEJ for more information about syzbot.
>> >> syzbot engineers can be reached at [email protected].
>> >>
>> >> syzbot will keep track of this issue. See:
>> >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>> >>
>> >> If the report is already addressed, let syzbot know by replying with:
>> >> #syz fix: exact-commit-title
>> >>
>> >> If you want syzbot to run the reproducer, reply with:
>> >> #syz test: git://repo/address.git branch-or-commit-hash
>> >> If you attach or paste a git patch, syzbot will apply it before testing.
>> >>
>> >> If you want to overwrite report's subsystems, reply with:
>> >> #syz set subsystems: new-subsystem
>> >> (See the list of subsystem names on the web dashboard)
>> >>
>> >> If the report is a duplicate of another one, reply with:
>> >> #syz dup: exact-subject-of-another-report
>> >>
>> >> If you want to undo deduplication, reply with:
>> >> #syz undup
>> >>
>>
>> --
>> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
>> To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
>> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000007d76cf06135efac5%40google.com.