* [syzbot] [edac?] general protection fault in detach_timer (3)
@ 2026-07-31 17:15 syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2026-07-31 17:15 UTC (permalink / raw)
To: bp, linux-edac, linux-kernel, peterz, syzkaller-bugs, tglx,
tony.luck
Hello,
syzbot found the following issue on:
HEAD commit: cc2b5f627e8c Add linux-next specific files for 20260714
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17ba25b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2290ccbf984c524f
dashboard link: https://syzkaller.appspot.com/bug?extid=edc6b57cbed1fb72d0f9
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13334aea580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156ce249580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6836f8efb1da/disk-cc2b5f62.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0109d3477cc7/vmlinux-cc2b5f62.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c2e49e350bbf/bzImage-cc2b5f62.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+edc6b57cbed1fb72d0f9@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000025: 0000 [#1] SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0xdead000000000128-0xdead00000000012f]
CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__hlist_del include/linux/list.h:1031 [inline]
RIP: 0010:detach_timer+0x120/0x2d0 kernel/time/timer.c:891
Code: c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 a9 51 80 00 4d 89 3c 24 4d 85 ff 74 46 e8 cb f9 13 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 82 51 80 00 4d 89 27 80 7c 24 04 00
RSP: 0018:ffffc90000157af8 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: 1ffff110170e4694 RCX: ffff88801daf8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000100
R10: dffffc0000000000 R11: fffffbfff1fa1890 R12: ffffc90000157c00
R13: ffff8880b87234a8 R14: 1ffff110170e4695 R15: dead00000000012a
FS: 0000000000000000(0000) GS:ffff8881259f2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a50cf012d CR3: 000000004485e000 CR4: 00000000003526f0
Call Trace:
<TASK>
expire_timers kernel/time/timer.c:1782 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x5f8/0x9b0 kernel/time/timer.c:2386
run_timer_base kernel/time/timer.c:2395 [inline]
run_timer_softirq+0x67/0x170 kernel/time/timer.c:2403
handle_softirqs+0x1d9/0x6c0 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
run_ktimerd+0x69/0x100 kernel/softirq.c:1155
smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__hlist_del include/linux/list.h:1031 [inline]
RIP: 0010:detach_timer+0x120/0x2d0 kernel/time/timer.c:891
Code: c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 a9 51 80 00 4d 89 3c 24 4d 85 ff 74 46 e8 cb f9 13 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 82 51 80 00 4d 89 27 80 7c 24 04 00
RSP: 0018:ffffc90000157af8 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: 1ffff110170e4694 RCX: ffff88801daf8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000100
R10: dffffc0000000000 R11: fffffbfff1fa1890 R12: ffffc90000157c00
R13: ffff8880b87234a8 R14: 1ffff110170e4695 R15: dead00000000012a
FS: 0000000000000000(0000) GS:ffff8881259f2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a50cf012d CR3: 000000004485e000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
7: 74 08 je 0x11
9: 4c 89 e7 mov %r12,%rdi
c: e8 a9 51 80 00 call 0x8051ba
11: 4d 89 3c 24 mov %r15,(%r12)
15: 4d 85 ff test %r15,%r15
18: 74 46 je 0x60
1a: e8 cb f9 13 00 call 0x13f9ea
1f: 49 83 c7 08 add $0x8,%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 ff mov %r15,%rdi
33: e8 82 51 80 00 call 0x8051ba
38: 4d 89 27 mov %r12,(%r15)
3b: 80 7c 24 04 00 cmpb $0x0,0x4(%rsp)
---
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 syzkaller@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [edac?] general protection fault in detach_timer (3)
[not found] <761cea30-ec04-465a-abf5-0d6160e4c759n@googlegroups.com>
@ 2026-08-13 6:01 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2026-08-13 6:01 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in detach_timer
Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000025: 0000 [#1] SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0xdead000000000128-0xdead00000000012f]
CPU: 0 UID: 0 PID: 6706 Comm: syz.0.35 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__hlist_del include/linux/list.h:1031 [inline]
RIP: 0010:detach_timer+0x120/0x2d0 kernel/time/timer.c:891
Code: c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 c9 48 7d 00 4d 89 3c 24 4d 85 ff 74 46 e8 4b d1 13 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 a2 48 7d 00 4d 89 27 80 7c 24 04 00
RSP: 0018:ffffc9000492fae8 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: 1ffff110170e4694 RCX: ffff888031879f00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f5e987 R12: ffff8880b86258f0
R13: ffff8880b87234a8 R14: 1ffff110170e4695 R15: dead00000000012a
FS: 00007f01d31bd6c0(0000) GS:ffff888125c46000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01d3bcb7c0 CR3: 0000000032b9e000 CR4: 00000000003526f0
Call Trace:
<TASK>
detach_if_pending kernel/time/timer.c:910 [inline]
__try_to_del_timer_sync kernel/time/timer.c:1462 [inline]
__timer_delete_sync+0x4fb/0x600 kernel/time/timer.c:1621
mce_timer_delete_all arch/x86/kernel/cpu/mce/core.c:1817 [inline]
set_ignore_ce+0x1c2/0x2a0 arch/x86/kernel/cpu/mce/core.c:2562
kernfs_fop_write_iter+0x3a5/0x540 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x61e/0xbb0 fs/read_write.c:687
ksys_write+0x156/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01d3b7e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f01d31bd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f01d3e06090 RCX: 00007f01d3b7e0d9
RDX: 0000000000000002 RSI: 00002000000001a0 RDI: 0000000000000003
RBP: 00007f01d3c15024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f01d3e06128 R14: 00007f01d3e06090 R15: 00007ffc28e9bd68
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__hlist_del include/linux/list.h:1031 [inline]
RIP: 0010:detach_timer+0x120/0x2d0 kernel/time/timer.c:891
Code: c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 c9 48 7d 00 4d 89 3c 24 4d 85 ff 74 46 e8 4b d1 13 00 49 83 c7 08 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 a2 48 7d 00 4d 89 27 80 7c 24 04 00
RSP: 0018:ffffc9000492fae8 EFLAGS: 00010802
RAX: 1bd5a00000000025 RBX: 1ffff110170e4694 RCX: ffff888031879f00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f5e987 R12: ffff8880b86258f0
R13: ffff8880b87234a8 R14: 1ffff110170e4695 R15: dead00000000012a
FS: 00007f01d31bd6c0(0000) GS:ffff888125c46000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01d3bcb7c0 CR3: 0000000032b9e000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: c1 e8 03 shr $0x3,%eax
3: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
7: 74 08 je 0x11
9: 4c 89 e7 mov %r12,%rdi
c: e8 c9 48 7d 00 call 0x7d48da
11: 4d 89 3c 24 mov %r15,(%r12)
15: 4d 85 ff test %r15,%r15
18: 74 46 je 0x60
1a: e8 4b d1 13 00 call 0x13d16a
1f: 49 83 c7 08 add $0x8,%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 ff mov %r15,%rdi
33: e8 a2 48 7d 00 call 0x7d48da
38: 4d 89 27 mov %r12,(%r15)
3b: 80 7c 24 04 00 cmpb $0x0,0x4(%rsp)
Tested on:
commit: cfeb0849 timers: Abort CPU hotplug on corrupted timer ..
git tree: https://github.com/yutao-intel/linux.git fix-edac
console output: https://syzkaller.appspot.com/x/log.txt?x=148bec79580000
kernel config: https://syzkaller.appspot.com/x/.config?x=158601bb8cb292dd
dashboard link: https://syzkaller.appspot.com/bug?extid=edc6b57cbed1fb72d0f9
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Note: no patches were applied.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2026-08-13 6:01 UTC | newest]
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2026-08-13 6:01 ` [syzbot] [edac?] general protection fault in detach_timer (3) syzbot
2026-07-31 17:15 syzbot
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