From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f199.google.com (mail-oi1-f199.google.com [209.85.167.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B6A6837DAAE for ; Sat, 17 Oct 2026 12:23:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792239825; cv=none; b=C5A8IeT0wJI2TabzTa7oFFoWAXXPNUukXcNQbG18zNs/fM+tJCSfE3xxb2qW+hUmVDA6eiBSB6I2yblmZA49EeJ7pi7QpiDmSKS3R+/GsdWMGJSEPvMYuMU9ZW1wtgcFJHBmAryl3CGXklhK+RRmP0HwAcVpaJGxtKNUcRYZE9k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792239825; c=relaxed/simple; bh=VQoiidGEkSeLoAedeAV3+JNqkKjiV3m6K1l9jefAsys=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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2002:a05:6808:6716:b0:4f9:6348:cd3b with SMTP id 5614622812f47-53ccf4ee273mr2059000b6e.41.1792239822636; Sat, 17 Oct 2026 05:23:42 -0700 (PDT) Date: Sat, 17 Oct 2026 05:23:42 -0700 In-Reply-To: <6a6cd87b.2d659fcc.1d46f5.019c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ad368ce.a6d1a155.34a93f.0014.GAE@google.com> Subject: Re: [syzbot] [edac?] WARNING in mce_timer_fn From: syzbot To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@kernel.org, tony.luck@intel.com, x86@kernel.org Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 70dd4ee72eb2 Merge tag 'pinctrl-v7.3-3' of git://git.kerne.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=114c8031580000 kernel config: https://syzkaller.appspot.com/x/.config?x=129d675874dbf896 dashboard link: https://syzkaller.appspot.com/bug?extid=9d17de59c48d71bd6824 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1391efd1580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9d17de59c48d71bd6824@syzkaller.appspotmail.com ------------[ cut here ]------------ cpu_t != t WARNING: arch/x86/kernel/cpu/mce/core.c:1770 at mce_timer_fn+0x289/0x2e0 arch/x86/kernel/cpu/mce/core.c:1770, CPU#0: udevd/4970 Modules linked in: CPU: 0 UID: 0 PID: 4970 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 RIP: 0010:mce_timer_fn+0x289/0x2e0 arch/x86/kernel/cpu/mce/core.c:1770 Code: 59 00 4d 01 e4 4d 39 ec 4d 0f 47 e5 31 ff 4c 89 e6 e8 6b 40 59 00 4d 85 e4 0f 84 20 ff ff ff e9 f7 fe ff ff e8 b8 45 59 00 90 <0f> 0b 90 e9 cf fd ff ff 4c 89 f6 48 c7 c7 a0 ef bf 8f e8 60 dc 84 RSP: 0018:ffffc90000007c20 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880b8223440 RCX: 0000000000000100 RDX: ffff88807cbccb00 RSI: ffffffff81b311b8 RDI: ffffffff8e6af920 RBP: ffff8880b8323440 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000100 R14: 1ffff92000000f8d R15: ffffffff81b30f30 FS: 00007fa1f48b4880(0000) GS:ffff888122946000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563a7ab14be0 CR3: 000000007be29000 CR4: 00000000003526f0 Call Trace: call_timer_fn+0x198/0x5f0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers+0x757/0xb00 kernel/time/timer.c:2374 __run_timer_base kernel/time/timer.c:2386 [inline] __run_timer_base kernel/time/timer.c:2378 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2395 run_timer_softirq+0x10/0x50 kernel/time/timer.c:2403 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0x16a/0x210 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:127 [inline] RIP: 0010:lock_acquire kernel/locking/lockdep.c:5938 [inline] RIP: 0010:lock_acquire+0x166/0x380 kernel/locking/lockdep.c:5899 Code: d5 00 00 00 65 8b 05 61 63 a6 13 85 c0 0f 85 c6 00 00 00 65 48 8b 05 91 1c a6 13 8b 90 a4 0b 00 00 85 d2 0f 85 b0 00 00 00 9c <8f> 04 24 fa 48 c7 c7 49 a7 4d 8e e8 6a 07 ed 09 45 89 e8 44 89 f6 RSP: 0018:ffffc90004e9f578 EFLAGS: 00000246 RAX: ffff88807cbccb00 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff81b9c261 RDI: fffffbfff1fbd8bc RBP: ffffffff8fdec5e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000200 R11: 000000000000b9e5 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:309 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] class_rcu_constructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495 __unwind_start+0x3cd/0x7e0 arch/x86/kernel/unwind_orc.c:787 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0x73/0xf0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5414 [inline] __kmalloc_noprof+0x32f/0x840 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] tomoyo_realpath_from_path+0xb6/0x690 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x276/0x460 security/tomoyo/file.c:827 security_inode_getattr+0x116/0x280 security/security.c:1895 vfs_getattr fs/stat.c:259 [inline] vfs_fstat+0x4b/0xe0 fs/stat.c:281 __do_sys_newfstat+0x8b/0x110 fs/stat.c:551 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa1f4111ad7 Code: 73 01 c3 48 8b 0d 21 f3 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8 RSP: 002b:00007ffe5cd40ab8 EFLAGS: 00000206 ORIG_RAX: 0000000000000005 RAX: ffffffffffffffda RBX: 000000000000000d RCX: 00007fa1f4111ad7 RDX: 0000000000090800 RSI: 00007ffe5cd40ac0 RDI: 000000000000000d RBP: 00007ffe5cd40ac0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000206 R12: 00005592845d9170 R13: 00000000000000ff R14: 000055926871bbe0 R15: 00007ffe5cd40e10 ---------------- Code disassembly (best guess): 0: d5 00 00 00 {rex2 0x0} add %al,(%rax) 4: 65 8b 05 61 63 a6 13 mov %gs:0x13a66361(%rip),%eax # 0x13a6636c b: 85 c0 test %eax,%eax d: 0f 85 c6 00 00 00 jne 0xd9 13: 65 48 8b 05 91 1c a6 mov %gs:0x13a61c91(%rip),%rax # 0x13a61cac 1a: 13 1b: 8b 90 a4 0b 00 00 mov 0xba4(%rax),%edx 21: 85 d2 test %edx,%edx 23: 0f 85 b0 00 00 00 jne 0xd9 29: 9c pushf * 2a: 8f 04 24 pop (%rsp) <-- trapping instruction 2d: fa cli 2e: 48 c7 c7 49 a7 4d 8e mov $0xffffffff8e4da749,%rdi 35: e8 6a 07 ed 09 call 0x9ed07a4 3a: 45 89 e8 mov %r13d,%r8d 3d: 44 89 f6 mov %r14d,%esi --- 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.