WARNING in update_rq_clock (2)

Status: upstream: reported C repro on 2026/07/03 00:38
Subsystems: kernel
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+681e729b2cf0d4860042@syzkaller.appspotmail.com
First crash: 98d, last: 3h42m
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ID Workflow Result Correct Bug Created Started Finished Revision
48fadd05 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in update_rq_clock (2) 2026/07/01 00:35 2026/07/01 00:35 2026/07/01 01:15 93f57954
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Title Replies (including bot) Last reply
[syzbot] [kernel?] WARNING in update_rq_clock (2) 3 (5) 2026/08/03 06:40
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in update_rq_clock fs -1 23 212d 303d 0/29 auto-obsoleted due to no activity on 2026/05/15 14:56
linux-6.1 WARNING in update_rq_clock -1 syz, C 1 12d 47d 0/3 upstream: reported C repro on 2026/08/18 22:00

Sample crash report:
------------[ cut here ]------------
debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0)
WARNING: kernel/sched/sched.h:1666 at lockdep_assert_rq_held kernel/sched/sched.h:1666 [inline], CPU#0: syz-executor251/5712
WARNING: kernel/sched/sched.h:1666 at lockdep_assert_rq_held kernel/sched/sched.h:1663 [inline], CPU#0: syz-executor251/5712
WARNING: kernel/sched/sched.h:1666 at update_rq_clock+0x40a/0xd20 kernel/sched/core.c:875, CPU#0: syz-executor251/5712
Modules linked in:
CPU: 0 UID: 0 PID: 5712 Comm: syz-executor251 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1666 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1663 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:875
Code: ab c8 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 d8 ae fd 09 a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 c0 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc9000307fb38 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853bf00 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8e367a38 RDI: ffffffff8c623880
RBP: ffffc9000307fcd8 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8880b843ca98 R11: 0000000000000000 R12: ffffffff91458704
R13: ffff8880b853cde0 R14: ffff8880b853bf00 R15: 0000000000000001
FS:  0000555564077400(0000) GS:ffff888123b52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000076872000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 pick_next_task kernel/sched/core.c:6375 [inline]
 __schedule+0x1c69/0x6920 kernel/sched/core.c:7199
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7606
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
RIP: 0010:memset_orig+0x75/0xb0 arch/x86/lib/memset_64.S:92
Code: 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1 e9 03 66 0f 1f 44 00 00 ff c9 48 89 07 <48> 8d 7f 08 75 f5 83 e2 07 74 0a ff ca 88 07 48 8d 7f 01 75 f6 4c
RSP: 0018:ffffc9000307fdf0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88802a3fbd00 RCX: 0000000000000002
RDX: 0000000000000018 RSI: 0000000000000000 RDI: ffffed100547f7a0
RBP: 00000000000000c0 R08: 00000000fff48df5 R09: 0000000000000000
R10: ffffed100547f7a0 R11: 0000000000000000 R12: ffff88801daaf280
R13: 0000000000000cc0 R14: 00000000ffffffff R15: ffff88802a3fbd00
 kasan_unpoison+0x27/0x60 mm/kasan/shadow.c:178
 unpoison_slab_object mm/kasan/common.c:336 [inline]
 __kasan_slab_alloc+0x4e/0x90 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x269/0x6a0 mm/slub.c:5010
 alloc_filename fs/namei.c:147 [inline]
 do_getname+0x35/0x390 fs/namei.c:187
 getname_flags fs/namei.c:230 [inline]
 getname include/linux/fs.h:2557 [inline]
 class_filename_constructor include/linux/fs.h:2584 [inline]
 __do_sys_mkdirat fs/namei.c:5463 [inline]
 __se_sys_mkdirat fs/namei.c:5461 [inline]
 __x64_sys_mkdirat+0x78/0xc0 fs/namei.c:5461
 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: 0033:0x7fcdcb429639
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc7c8a8278 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcdcb429639
RDX: 00000000000001ff RSI: 0000200000000000 RDI: 00000000ffffff9c
RBP: 00000000000f4240 R08: 0000000000000009 R09: 0000000000000009
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000010248
R13: 00007ffc7c8a828c R14: 00007ffc7c8a82a0 R15: 00007ffc7c8a8290
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 47 30             	mov    %eax,0x30(%rdi)
   3:	48 89 47 38          	mov    %rax,0x38(%rdi)
   7:	48 8d 7f 40          	lea    0x40(%rdi),%rdi
   b:	75 d8                	jne    0xffffffe5
   d:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  14:	00
  15:	89 d1                	mov    %edx,%ecx
  17:	83 e1 38             	and    $0x38,%ecx
  1a:	74 14                	je     0x30
  1c:	c1 e9 03             	shr    $0x3,%ecx
  1f:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
  25:	ff c9                	dec    %ecx
  27:	48 89 07             	mov    %rax,(%rdi)
* 2a:	48 8d 7f 08          	lea    0x8(%rdi),%rdi <-- trapping instruction
  2e:	75 f5                	jne    0x25
  30:	83 e2 07             	and    $0x7,%edx
  33:	74 0a                	je     0x3f
  35:	ff ca                	dec    %edx
  37:	88 07                	mov    %al,(%rdi)
  39:	48 8d 7f 01          	lea    0x1(%rdi),%rdi
  3d:	75 f6                	jne    0x35
  3f:	4c                   	rex.WR

Crashes (1252):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/25 15:06 upstream 165768bb7026 f281d9d2 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/09/13 10:18 upstream 2f0c1cf72f46 70a60e12 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in update_rq_clock
2026/09/21 03:36 upstream 518e5b794c06 853b104b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/20 23:26 upstream 518e5b794c06 853b104b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/12 07:09 upstream 3026c6e4f223 70a60e12 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/08 09:45 upstream 28924df2a08f 680aa3e1 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/06 03:36 upstream 9f0346dcbea3 4f7b22a0 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/13 11:59 upstream 50d05c7c76c9 70a60e12 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/02 12:03 linux-next 6474fa070f2b 6d32eb1f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/10/02 10:46 linux-next 6474fa070f2b 6d32eb1f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/09/25 06:47 linux-next 4c253ac4b29b f281d9d2 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/08/03 06:39 linux-next cc2b5f627e8c e611ffe1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/08/25 14:04 linux-next 4b18edbd8e70 614e416a .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/08/23 12:30 linux-next 903c1cf6dff9 1e72964b .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/08/20 13:47 linux-next 6a746cd265ae 1e72964b .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/10/05 03:41 upstream a90ee4305c4a 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/05 03:36 upstream a90ee4305c4a 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/05 02:11 upstream 6addb4f38557 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/04 23:18 upstream 6addb4f38557 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/04 22:10 upstream 6addb4f38557 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/04 21:03 upstream 6addb4f38557 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in update_rq_clock
2026/10/04 17:29 upstream 6addb4f38557 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in update_rq_clock
2026/10/04 15:04 upstream 6addb4f38557 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in update_rq_clock
2026/10/04 03:01 upstream a74306e2e676 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/02 17:18 upstream ce1e0223d8ad 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/02 14:47 upstream ce1e0223d8ad 6d32eb1f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/01 16:12 upstream 551c722f4080 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in update_rq_clock
2026/10/01 12:52 upstream 551c722f4080 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/01 06:23 upstream 551c722f4080 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in update_rq_clock
2026/10/01 05:19 upstream 551c722f4080 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in update_rq_clock
2026/09/24 17:10 upstream 62f4c998b297 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in update_rq_clock
2026/06/29 00:32 upstream 8b69c0475871 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in update_rq_clock
2026/10/04 09:59 upstream a74306e2e676 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/04 06:33 upstream a74306e2e676 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/03 23:51 upstream a74306e2e676 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/02 23:24 upstream 3b7cab693ba2 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/02 06:11 upstream d24e8ac715de 6d32eb1f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/05 10:36 upstream a90ee4305c4a 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/05 07:01 upstream a90ee4305c4a 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 22:12 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 22:07 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 18:39 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 16:15 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 15:13 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 15:11 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 14:11 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 14:11 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 12:23 upstream e767a4ea70a3 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 09:03 upstream 3b7cab693ba2 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 03:30 upstream 3b7cab693ba2 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 01:51 upstream 3b7cab693ba2 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 01:44 upstream 3b7cab693ba2 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/03 01:42 upstream 3b7cab693ba2 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/02 21:04 upstream 3b7cab693ba2 57bbd979 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/02 15:32 upstream ce1e0223d8ad 1065c8fa .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/02 01:07 upstream d24e8ac715de 6d32eb1f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/01 15:05 upstream 551c722f4080 38f7f0d1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/01 15:02 upstream 551c722f4080 38f7f0d1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/01 11:54 upstream 551c722f4080 38f7f0d1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/01 02:14 upstream 551c722f4080 15fb8e5e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/30 23:24 upstream 551c722f4080 15fb8e5e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/05 09:19 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/04 19:06 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/04 12:32 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/04 11:00 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/03 20:00 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/03 06:28 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/03 04:44 linux-next f0406245cb98 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
* Struck through repros no longer work on HEAD.