Hello,
syzbot found the following issue on:
HEAD commit: 5e60366d Merge tag 'fallthrough-fixes-clang-5.11-rc1' of g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=179a2287500000
kernel config: https://syzkaller.appspot.com/x/.config?x=db720fe37a6a41d8
dashboard link: https://syzkaller.appspot.com/bug?extid=78bab6958a614b0c80b9
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10ea3e0f500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
------------[ cut here ]------------
WARNING: CPU: 0 PID: 9908 at net/can/isotp.c:835 isotp_tx_timer_handler+0x65f/0xba0 net/can/isotp.c:835
Modules linked in:
CPU: 0 PID: 9908 Comm: systemd-udevd Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:isotp_tx_timer_handler+0x65f/0xba0 net/can/isotp.c:835
Code: c1 e8 03 83 e1 07 0f b6 04 28 38 c8 7f 08 84 c0 0f 85 b8 04 00 00 41 88 54 24 05 e9 07 fb ff ff 40 84 ed 75 21 e8 21 11 80 f9 <0f> 0b 45 31 e4 e8 17 11 80 f9 44 89 e0 48 83 c4 48 5b 5d 41 5c 41
RSP: 0018:ffffc90000007dc8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88803e4e8518 RCX: 0000000000000100
RDX: ffff8880117d5040 RSI: ffffffff87f2102f RDI: 0000000000000003
RBP: 0000000000000000 R08: ffffffff8a7b6540 R09: ffffffff87f20a2e
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880b9c26c80 R14: ffff8880b9c26a00 R15: ffff88803e4e8000
FS: 00007fc247dbb8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcab7e7800 CR3: 000000001c8c6000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__run_hrtimer kernel/time/hrtimer.c:1519 [inline]
__hrtimer_run_queues+0x609/0xea0 kernel/time/hrtimer.c:1583
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600
__do_softirq+0x2bc/0xa77 kernel/softirq.c:343
asm_call_irq_on_stack+0xf/0x20
</IRQ>
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:226 [inline]
__irq_exit_rcu+0x17f/0x200 kernel/softirq.c:420
irq_exit_rcu+0x5/0x20 kernel/softirq.c:432
sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:call_rcu+0x2e7/0x710 kernel/rcu/tree.c:3039
Code: 3c 02 00 0f 85 bb 03 00 00 48 8b 05 63 75 1a 0a 49 03 84 24 f0 00 00 00 49 39 c7 0f 8f 72 01 00 00 e8 5d e4 18 00 ff 34 24 9d <48> 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 80 3c 02 00 0f 84 2f
RSP: 0018:ffffc9000adafb88 EFLAGS: 00000246
RAX: 00000000000010e9 RBX: ffff8880143c1780 RCX: ffffffff815740d7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880b9c35b70 R08: 0000000000000001 R09: ffffffff8f4f983f
R10: fffffbfff1e9f307 R11: 0000000000000000 R12: ffff8880b9c35a80
R13: ffff8880b9c35b60 R14: ffff8880b9c35b18 R15: 000000000000002c
security_inode_free+0x9a/0xc0 security/security.c:1005
__destroy_inode+0x24d/0x740 fs/inode.c:259
destroy_inode+0x91/0x1b0 fs/inode.c:282
iput_final fs/inode.c:1654 [inline]
iput.part.0+0x41e/0x840 fs/inode.c:1680
iput+0x58/0x70 fs/inode.c:1670
dentry_unlink_inode+0x2b1/0x3d0 fs/dcache.c:374
__dentry_kill+0x3c0/0x640 fs/dcache.c:579
dentry_kill fs/dcache.c:717 [inline]
dput+0x696/0xc10 fs/dcache.c:878
do_renameat2+0xae7/0xbf0 fs/namei.c:4461
__do_sys_rename fs/namei.c:4503 [inline]
__se_sys_rename fs/namei.c:4501 [inline]
__x64_sys_rename+0x5d/0x80 fs/namei.c:4501
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fc246bb7d47
Code: 75 12 48 89 df e8 19 84 07 00 85 c0 0f 95 c0 0f b6 c0 f7 d8 5b c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 52 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 21 41 33 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcab6e3c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00005556c8f7a380 RCX: 00007fc246bb7d47
RDX: 0000000000000000 RSI: 00007ffcab6e3c70 RDI: 00005556c8f823b0
RBP: 00007ffcab6e3d30 R08: 00005556c8f812c0 R09: 00005556c8f811e0
R10: 00007fc247dbb8c0 R11: 0000000000000246 R12: 00007ffcab6e3c70
R13: 0000000000000001 R14: 00005556c71306cb R15: 0000000000000000
---
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.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
Hello Hillf,
On 21.12.20 06:40, Hillf Danton wrote:
> Sun, 20 Dec 2020 11:24:13 -0800
>> syzbot found the following issue on:
>>
>> HEAD commit: 5e60366d Merge tag 'fallthrough-fixes-clang-5.11-rc1' of g..
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=179a2287500000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=db720fe37a6a41d8
>> dashboard link: https://syzkaller.appspot.com/bug?extid=78bab6958a614b0c80b9
>> compiler: gcc (GCC) 10.1.0-syz 20200507
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10ea3e0f500000
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: [email protected]
>>
>> ------------[ cut here ]------------
>> WARNING: CPU: 0 PID: 9908 at net/can/isotp.c:835 isotp_tx_timer_handler+0x65f/0xba0 net/can/isotp.c:835
>> Modules linked in:
>> CPU: 0 PID: 9908 Comm: systemd-udevd Not tainted 5.10.0-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>> RIP: 0010:isotp_tx_timer_handler+0x65f/0xba0 net/can/isotp.c:835
>> Code: c1 e8 03 83 e1 07 0f b6 04 28 38 c8 7f 08 84 c0 0f 85 b8 04 00 00 41 88 54 24 05 e9 07 fb ff ff 40 84 ed 75 21 e8 21 11 80 f9 <0f> 0b 45 31 e4 e8 17 11 80 f9 44 89 e0 48 83 c4 48 5b 5d 41 5c 41
>> RSP: 0018:ffffc90000007dc8 EFLAGS: 00010246
>> RAX: 0000000000000000 RBX: ffff88803e4e8518 RCX: 0000000000000100
>> RDX: ffff8880117d5040 RSI: ffffffff87f2102f RDI: 0000000000000003
>> RBP: 0000000000000000 R08: ffffffff8a7b6540 R09: ffffffff87f20a2e
>> R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
>> R13: ffff8880b9c26c80 R14: ffff8880b9c26a00 R15: ffff88803e4e8000
>> FS: 00007fc247dbb8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 00007ffcab7e7800 CR3: 000000001c8c6000 CR4: 00000000001506f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>> <IRQ>
>> __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
>> __hrtimer_run_queues+0x609/0xea0 kernel/time/hrtimer.c:1583
>> hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600
>> __do_softirq+0x2bc/0xa77 kernel/softirq.c:343
>> asm_call_irq_on_stack+0xf/0x20
>> </IRQ>
>> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
>> run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
>> do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
>> invoke_softirq kernel/softirq.c:226 [inline]
>> __irq_exit_rcu+0x17f/0x200 kernel/softirq.c:420
>> irq_exit_rcu+0x5/0x20 kernel/softirq.c:432
>> sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
>> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
>> RIP: 0010:call_rcu+0x2e7/0x710 kernel/rcu/tree.c:3039
>> Code: 3c 02 00 0f 85 bb 03 00 00 48 8b 05 63 75 1a 0a 49 03 84 24 f0 00 00 00 49 39 c7 0f 8f 72 01 00 00 e8 5d e4 18 00 ff 34 24 9d <48> 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 80 3c 02 00 0f 84 2f
>> RSP: 0018:ffffc9000adafb88 EFLAGS: 00000246
>> RAX: 00000000000010e9 RBX: ffff8880143c1780 RCX: ffffffff815740d7
>> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
>> RBP: ffff8880b9c35b70 R08: 0000000000000001 R09: ffffffff8f4f983f
>> R10: fffffbfff1e9f307 R11: 0000000000000000 R12: ffff8880b9c35a80
>> R13: ffff8880b9c35b60 R14: ffff8880b9c35b18 R15: 000000000000002c
>> security_inode_free+0x9a/0xc0 security/security.c:1005
>> __destroy_inode+0x24d/0x740 fs/inode.c:259
>> destroy_inode+0x91/0x1b0 fs/inode.c:282
>> iput_final fs/inode.c:1654 [inline]
>> iput.part.0+0x41e/0x840 fs/inode.c:1680
>> iput+0x58/0x70 fs/inode.c:1670
>> dentry_unlink_inode+0x2b1/0x3d0 fs/dcache.c:374
>> __dentry_kill+0x3c0/0x640 fs/dcache.c:579
>> dentry_kill fs/dcache.c:717 [inline]
>> dput+0x696/0xc10 fs/dcache.c:878
>> do_renameat2+0xae7/0xbf0 fs/namei.c:4461
>> __do_sys_rename fs/namei.c:4503 [inline]
>> __se_sys_rename fs/namei.c:4501 [inline]
>> __x64_sys_rename+0x5d/0x80 fs/namei.c:4501
>> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>> entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> RIP: 0033:0x7fc246bb7d47
>> Code: 75 12 48 89 df e8 19 84 07 00 85 c0 0f 95 c0 0f b6 c0 f7 d8 5b c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 52 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 21 41 33 00 f7 d8 64 89 01 48
>> RSP: 002b:00007ffcab6e3c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
>> RAX: ffffffffffffffda RBX: 00005556c8f7a380 RCX: 00007fc246bb7d47
>> RDX: 0000000000000000 RSI: 00007ffcab6e3c70 RDI: 00005556c8f823b0
>> RBP: 00007ffcab6e3d30 R08: 00005556c8f812c0 R09: 00005556c8f811e0
>> R10: 00007fc247dbb8c0 R11: 0000000000000246 R12: 00007ffcab6e3c70
>> R13: 0000000000000001 R14: 00005556c71306cb R15: 0000000000000000
>
> Canceling a running timer that handles ISOTP_WAIT_FC/ISOTP_WAIT_FIRST_FC
> ends up with the so->tx.state assigned to be ISOTP_IDLE. That triggers
> the warning. Fix it by correcting state before adding timer.
>
> --- a/net/can/isotp.c
> +++ b/net/can/isotp.c
> @@ -378,6 +378,7 @@ static int isotp_rcv_fc(struct isotp_soc
> break;
>
> case ISOTP_FC_WT:
> + so->tx.state = ISOTP_WAIT_FC;
> /* start timer to wait for next FC frame */
> hrtimer_start(&so->txtimer, ktime_set(1, 0),
> HRTIMER_MODE_REL_SOFT);
>
Thanks for looking into this!
But how did you get to this insight?
When going through isotp_rcv_fc() there is no other way than
so->tx.state already contains ISOTP_WAIT_FC at that point.
Or did I miss something?
Best regards,
Oliver
syzbot has found a reproducer for the following issue on:
HEAD commit: 614cb589 Merge tag 'acpi-5.11-rc1-2' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=151d558f500000
kernel config: https://syzkaller.appspot.com/x/.config?x=3e7e34a83d606100
dashboard link: https://syzkaller.appspot.com/bug?extid=78bab6958a614b0c80b9
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1196822b500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c75f97500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at net/can/isotp.c:835 isotp_tx_timer_handler+0x65f/0xba0 net/can/isotp.c:835
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:isotp_tx_timer_handler+0x65f/0xba0 net/can/isotp.c:835
Code: c1 e8 03 83 e1 07 0f b6 04 28 38 c8 7f 08 84 c0 0f 85 b8 04 00 00 41 88 54 24 05 e9 07 fb ff ff 40 84 ed 75 21 e8 c1 64 7e f9 <0f> 0b 45 31 e4 e8 b7 64 7e f9 44 89 e0 48 83 c4 48 5b 5d 41 5c 41
RSP: 0018:ffffc90000007dc8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88802a288518 RCX: 0000000000000100
RDX: ffffffff8b49bc00 RSI: ffffffff87f4e3ff RDI: 0000000000000003
RBP: 0000000000000000 R08: ffffffff8a7baf80 R09: ffffffff87f4ddfe
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880b9c26c80 R14: ffff8880b9c26a00 R15: ffff88802a288000
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd91884b10 CR3: 000000001b5d4000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__run_hrtimer kernel/time/hrtimer.c:1519 [inline]
__hrtimer_run_queues+0x609/0xea0 kernel/time/hrtimer.c:1583
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600
__do_softirq+0x2bc/0xa77 kernel/softirq.c:343
asm_call_irq_on_stack+0xf/0x20
</IRQ>
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:226 [inline]
__irq_exit_rcu+0x17f/0x200 kernel/softirq.c:420
irq_exit_rcu+0x5/0x20 kernel/softirq.c:432
sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:169 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:516
Code: ed 26 57 f8 84 db 75 ac e8 64 20 57 f8 e8 3f f6 5c f8 e9 0c 00 00 00 e8 55 20 57 f8 0f 00 2d ae 57 ae 00 e8 49 20 57 f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 24 28 57 f8 48 85 db
RSP: 0018:ffffffff8b407d60 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff8b49bc00 RSI: ffffffff891c2877 RDI: 0000000000000000
RBP: ffff888141653064 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff81791ed8 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888141653000 R14: ffff888141653064 R15: ffff888017f65004
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:647
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:158 [inline]
cpuidle_idle_call kernel/sched/idle.c:239 [inline]
do_idle+0x3eb/0x590 kernel/sched/idle.c:299
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396
start_kernel+0x496/0x4b7 init/main.c:1061
secondary_startup_64_no_verify+0xb0/0xbb