hi, Uros Bizjak,
we reported an early crash issue for this commit last Oct.
https://lore.kernel.org/all/[email protected]/
as you mentioned at that time
"It is KASAN that is not compatible with named address spaces [1]."
now we noticed the commit is merged into mainline, and we observed a different
issue related with kcsan_setup_watchpoint. below detail report FYI.
[1] https://lore.kernel.org/lkml/CAHk-=wi6U-O1wdPOESuCE6QO2OaPu0hEzaig0uDOU4L5CREhug@mail.gmail.com/
Hello,
kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on:
commit: ca4256348660cb2162668ec3d13d1f921d05374a ("x86/percpu: Use C for percpu read/write accessors")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
[test failed on linus/master b3603fcb79b1036acae10602bffc4855a4b9af80]
[test failed on linux-next/master 226d3c72fcde130a99d760895ebdd20e78e02cb5]
in testcase: boot
compiler: gcc-12
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+-------------------------------------------------------------------------+------------+------------+
| | 9a462b9eaf | ca42563486 |
+-------------------------------------------------------------------------+------------+------------+
| BUG:unable_to_handle_page_fault_for_address | 0 | 6 |
| Oops:#[##] | 0 | 6 |
| RIP:kcsan_setup_watchpoint | 0 | 6 |
+-------------------------------------------------------------------------+------------+------------+
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-lkp/[email protected]
[ 1.416777][ C0] BUG: unable to handle page fault for address: 000000000002bd28
[ 1.416777][ C0] #PF: supervisor read access in kernel mode
[ 1.416777][ C0] #PF: error_code(0x0000) - not-present page
[ 1.416777][ C0] PGD 0 P4D 0
[ 1.416777][ C0] Oops: 0000 [#1] SMP
[ 1.416777][ C0] CPU: 0 PID: 2 Comm: kthreadd Not tainted 6.5.0-11417-gca4256348660 #1 232bbe22019ca80af13d3fa459a6dc475e14d345
[ 1.416777][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 1.416777][ C0] RIP: 0010:kcsan_setup_watchpoint (kernel/kcsan/core.c:353 kernel/kcsan/core.c:609)
[ 1.416777][ C0] Code: d1 7e e9 ab fc ff ff 48 83 fd 08 0f 85 15 01 00 00 4d 8b 14 24 4d 89 d8 4d 31 d0 e9 d6 fe ff ff 48 83 fd 08 0f 85 f4 00 00 00 <4d> 8b 1c 24 e9 31 fe ff ff 9c 58 48 89 44 24 10 fa f6 c4 02 0f 84
All code
========
0: d1 7e e9 sarl -0x17(%rsi)
3: ab stos %eax,%es:(%rdi)
4: fc cld
5: ff (bad)
6: ff 48 83 decl -0x7d(%rax)
9: fd std
a: 08 0f or %cl,(%rdi)
c: 85 15 01 00 00 4d test %edx,0x4d000001(%rip) # 0x4d000013
12: 8b 14 24 mov (%rsp),%edx
15: 4d 89 d8 mov %r11,%r8
18: 4d 31 d0 xor %r10,%r8
1b: e9 d6 fe ff ff jmp 0xfffffffffffffef6
20: 48 83 fd 08 cmp $0x8,%rbp
24: 0f 85 f4 00 00 00 jne 0x11e
2a:* 4d 8b 1c 24 mov (%r12),%r11 <-- trapping instruction
2e: e9 31 fe ff ff jmp 0xfffffffffffffe64
33: 9c pushf
34: 58 pop %rax
35: 48 89 44 24 10 mov %rax,0x10(%rsp)
3a: fa cli
3b: f6 c4 02 test $0x2,%ah
3e: 0f .byte 0xf
3f: 84 .byte 0x84
Code starting with the faulting instruction
===========================================
0: 4d 8b 1c 24 mov (%r12),%r11
4: e9 31 fe ff ff jmp 0xfffffffffffffe3a
9: 9c pushf
a: 58 pop %rax
b: 48 89 44 24 10 mov %rax,0x10(%rsp)
10: fa cli
11: f6 c4 02 test $0x2,%ah
14: 0f .byte 0xf
15: 84 .byte 0x84
[ 1.416777][ C0] RSP: 0000:ffffc90000003eb8 EFLAGS: 00010046
[ 1.416777][ C0] RAX: 0000000000000000 RBX: ffff88842fc2b6e0 RCX: 0000000000000001
[ 1.416777][ C0] RDX: 001000000002bd28 RSI: 0000000000000000 RDI: 000000000000002b
[ 1.416777][ C0] RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
[ 1.416777][ C0] R10: 0000000000000160 R11: 00000000aaaaaaab R12: 000000000002bd28
[ 1.416777][ C0] R13: 000000000000002c R14: 0000000000000000 R15: ffffffff841f2200
[ 1.416777][ C0] FS: 0000000000000000(0000) GS:ffff88842fc00000(0000) knlGS:0000000000000000
[ 1.416777][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1.416777][ C0] CR2: 000000000002bd28 CR3: 0000000003e38000 CR4: 00000000000406b0
[ 1.416777][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1.416777][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1.416777][ C0] Call Trace:
[ 1.416777][ C0] <IRQ>
[ 1.416777][ C0] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434)
[ 1.416777][ C0] ? page_fault_oops (arch/x86/mm/fault.c:707)
[ 1.416777][ C0] ? exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1561)
[ 1.416777][ C0] ? asm_exc_page_fault (arch/x86/include/asm/idtentry.h:570)
[ 1.416777][ C0] ? kcsan_setup_watchpoint (kernel/kcsan/core.c:353 kernel/kcsan/core.c:609)
[ 1.416777][ C0] ? rcu_is_cpu_rrupt_from_idle (kernel/rcu/tree.c:357)
[ 1.416777][ C0] rcu_is_cpu_rrupt_from_idle (kernel/rcu/tree.c:357)
[ 1.416777][ C0] rcu_sched_clock_irq (kernel/rcu/tree.c:3869 kernel/rcu/tree.c:2240)
[ 1.416777][ C0] update_process_times (arch/x86/include/asm/preempt.h:27 kernel/time/timer.c:2073)
[ 1.416777][ C0] tick_periodic (kernel/time/tick-common.c:102)
[ 1.416777][ C0] tick_handle_periodic (kernel/time/tick-common.c:120)
[ 1.416777][ C0] __sysvec_apic_timer_interrupt (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:207 arch/x86/include/asm/trace/irq_vectors.h:41 arch/x86/kernel/apic/apic.c:1081)
[ 1.416777][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1074 (discriminator 14))
[ 1.416777][ C0] </IRQ>
[ 1.416777][ C0] <TASK>
[ 1.416777][ C0] asm_sysvec_apic_timer_interrupt (arch/x86/include/asm/idtentry.h:645)
[ 1.416777][ C0] RIP: 0010:__tsan_read8 (arch/x86/include/asm/current.h:41 kernel/kcsan/core.c:206 kernel/kcsan/core.c:750 kernel/kcsan/core.c:1025)
[ 1.416777][ C0] Code: 08 85 c9 7f 3e 8b 50 0c 85 d2 7e 57 48 83 78 28 00 75 7b 31 c0 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 45 31 db c3 <65> 48 8b 04 25 c0 f8 02 00 8b 88 10 13 00 00 48 05 08 13 00 00 85
All code
========
0: 08 85 c9 7f 3e 8b or %al,-0x74c18037(%rbp)
6: 50 push %rax
7: 0c 85 or $0x85,%al
9: d2 7e 57 sarb %cl,0x57(%rsi)
c: 48 83 78 28 00 cmpq $0x0,0x28(%rax)
11: 75 7b jne 0x8e
13: 31 c0 xor %eax,%eax
15: 31 d2 xor %edx,%edx
17: 31 c9 xor %ecx,%ecx
19: 31 f6 xor %esi,%esi
1b: 31 ff xor %edi,%edi
1d: 45 31 c0 xor %r8d,%r8d
20: 45 31 c9 xor %r9d,%r9d
23: 45 31 d2 xor %r10d,%r10d
26: 45 31 db xor %r11d,%r11d
29: c3 ret
2a:* 65 48 8b 04 25 c0 f8 mov %gs:0x2f8c0,%rax <-- trapping instruction
31: 02 00
33: 8b 88 10 13 00 00 mov 0x1310(%rax),%ecx
39: 48 05 08 13 00 00 add $0x1308,%rax
3f: 85 .byte 0x85
Code starting with the faulting instruction
===========================================
0: 65 48 8b 04 25 c0 f8 mov %gs:0x2f8c0,%rax
7: 02 00
9: 8b 88 10 13 00 00 mov 0x1310(%rax),%ecx
f: 48 05 08 13 00 00 add $0x1308,%rax
15: 85 .byte 0x85
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240325/[email protected]
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki