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: 108d, last: 1h48m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (1)
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
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] sched/core: Do not touch SMT siblings that have not joined the core yet 1 (1) 2026/10/06 06:12
[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 222d 313d 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 22d 57d 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 (1511):
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
2026/10/12 06:22 upstream 24a19b953e2a 4f92358f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream 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
2026/10/14 08:38 upstream ca3e345926b0 7321cd29 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 09:32 upstream a5ebb76233b7 4f92358f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 08:15 upstream a5ebb76233b7 4f92358f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 06:59 upstream a5ebb76233b7 4f92358f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 06:11 upstream a5ebb76233b7 4f92358f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 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
2026/10/15 05:43 upstream 4056b3c9d3c9 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/14 11:17 upstream ca3e345926b0 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in update_rq_clock
2026/10/14 04:31 upstream ca3e345926b0 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in update_rq_clock
2026/10/13 13:23 upstream 24a19b953e2a 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in update_rq_clock
2026/10/13 12:22 upstream 24a19b953e2a 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/13 09:09 upstream 24a19b953e2a 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/12 19:42 upstream 24a19b953e2a 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in update_rq_clock
2026/10/12 18:00 upstream 24a19b953e2a 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in update_rq_clock
2026/10/12 12:47 upstream 24a19b953e2a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in update_rq_clock
2026/10/12 03:18 upstream b88c841d1164 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in update_rq_clock
2026/10/11 20:52 upstream b88c841d1164 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in update_rq_clock
2026/10/11 15:13 upstream a5ebb76233b7 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in update_rq_clock
2026/10/10 15:13 upstream 3857c2fe5449 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/10/09 02:57 upstream 6c377d19d4a5 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-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
2026/10/15 08:11 upstream 0fcb05b72344 8fb0ae89 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/14 07:02 upstream ca3e345926b0 7321cd29 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/11 19:43 upstream b88c841d1164 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/11 05:02 upstream a5ebb76233b7 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/10 20:11 upstream 3857c2fe5449 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/10/15 11:41 upstream 0fcb05b72344 8fb0ae89 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/15 09:43 upstream 0fcb05b72344 8fb0ae89 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/15 02:25 upstream 0fcb05b72344 8fb0ae89 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/14 19:49 upstream 4056b3c9d3c9 1a71827b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/14 00:08 upstream 24a19b953e2a 7321cd29 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/13 19:07 upstream 24a19b953e2a 7321cd29 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/13 17:53 upstream 24a19b953e2a 5a1eeac4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/13 16:42 upstream 24a19b953e2a 5a1eeac4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/13 05:29 upstream 24a19b953e2a 745a967f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/13 05:27 upstream 24a19b953e2a 745a967f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/13 02:26 upstream 24a19b953e2a 745a967f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/13 01:08 upstream 24a19b953e2a 745a967f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/12 23:52 upstream 24a19b953e2a 745a967f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/12 21:55 upstream 24a19b953e2a 745a967f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 21:34 upstream b88c841d1164 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 17:24 upstream b88c841d1164 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 13:54 upstream a5ebb76233b7 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 11:56 upstream a5ebb76233b7 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 09:31 upstream a5ebb76233b7 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 03:10 upstream a5ebb76233b7 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/11 00:01 upstream 3857c2fe5449 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/10 17:54 upstream 3857c2fe5449 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/10 12:27 upstream 3857c2fe5449 4f92358f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/10/15 04:19 linux-next d419d682257d 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/14 11:59 linux-next 1fffefb00cc0 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/10/13 22:34 linux-next 1fffefb00cc0 7321cd29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/13 11:17 linux-next 4eb2586bd40d 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/13 10:12 linux-next 4eb2586bd40d 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/10/12 04:37 linux-next becb95e45ef0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/10 22:20 linux-next becb95e45ef0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/10/10 16:20 linux-next becb95e45ef0 4f92358f .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.