[syzbot] [edac?] WARNING in mce_timer_fn

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: cc2b5f627e8c Add linux-next specific files for 20260714
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1304e249580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2290ccbf984c524f
dashboard link: https://syzkaller.appspot.com/bug?extid=9d17de59c48d71bd6824
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=14efd632580000

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+9d17de...@syzkaller.appspotmail.com

------------[ cut here ]------------
cpu_t != t
WARNING: arch/x86/kernel/cpu/mce/core.c:1770 at mce_timer_fn+0x23f/0x280 arch/x86/kernel/cpu/mce/core.c:1770, CPU#0: ktimers/0/16
Modules linked in:
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:mce_timer_fn+0x23f/0x280 arch/x86/kernel/cpu/mce/core.c:1770
Code: 00 75 0a e8 93 3b 55 00 e9 16 ff ff ff e8 89 3b 55 00 4c 8b 1d f2 b1 af 0c 2e 2e 2e 41 ff d3 e9 ff fe ff ff e8 72 3b 55 00 90 <0f> 0b 90 e9 33 fe ff ff e8 64 3b 55 00 48 c7 c7 a0 20 20 8e 4c 89
RSP: 0018:ffffc90000157a08 EFLAGS: 00010246
RAX: ffffffff8170683e RBX: ffff8880b87234a0 RCX: ffff88801daf8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000100
R10: dffffc0000000000 R11: ffffffff81706600 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8dc427d0 R15: ffff8880b87234a0
FS: 0000000000000000(0000) GS:ffff8881259f2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f08d99b56c8 CR3: 000000003fe3e000 CR4: 00000000003526f0
Call Trace:
<TASK>
call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2374 [inline]
__run_timer_base+0x67b/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>


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[Borislav Petkov]

On Fri, Jul 31, 2026 at 10:16:43AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: cc2b5f627e8c Add linux-next specific files for 20260714

$ git checkout cc2b5f627e8c
error: pathspec 'cc2b5f627e8c' did not match any file(s) known to git

Looks like a report from 2 weeks ago.

--
Regards/Gruss,
Boris.

https://people.kernel.org/tglx/notes-about-netiquette