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: 86d, last: 4h05m
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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 200d 291d 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 35d 35d 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: migration/0/20
WARNING: kernel/sched/sched.h:1666 at lockdep_assert_rq_held kernel/sched/sched.h:1663 [inline], CPU#0: migration/0/20
WARNING: kernel/sched/sched.h:1666 at update_rq_clock+0x40a/0xd20 kernel/sched/core.c:875, CPU#0: migration/0/20
Modules linked in:
CPU: 0 UID: 0 PID: 20 Comm: migration/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Stopper: 0x0 <- 0x0
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 98 f0 fa 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:ffffc90000197c30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853c040 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8e369009 RDI: ffffffff8c623380
RBP: ffffc90000197dd0 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8880b843cbd8 R11: 00000017c66ce800 R12: ffffffff914589e4
R13: ffff8880b853cf20 R14: ffff8880b853c040 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888123b5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fce76fef2f8 CR3: 00000000778ee000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 pick_next_task kernel/sched/core.c:6367 [inline]
 __schedule+0x1c69/0x6920 kernel/sched/core.c:7191
 __schedule_loop kernel/sched/core.c:7353 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7368
 smpboot_thread_fn+0x8a0/0xab0 kernel/smpboot.c:156
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (831):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/08/03 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
2026/09/21 18:59 upstream 93f51579e7df 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/09/21 11:02 upstream 93f51579e7df 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in update_rq_clock
2026/09/21 05:07 upstream 518e5b794c06 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in update_rq_clock
2026/09/20 13:15 upstream 518e5b794c06 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in update_rq_clock
2026/09/20 11:10 upstream 518e5b794c06 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in update_rq_clock
2026/09/20 02:56 upstream 40288c9206c1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in update_rq_clock
2026/09/19 22:46 upstream 40288c9206c1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in update_rq_clock
2026/09/19 01:29 upstream c3d85c669d09 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in update_rq_clock
2026/09/17 19:42 upstream 4982d3552a3b 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in update_rq_clock
2026/09/16 11:22 upstream 9b87fdc9af2f 12a0a44a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-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
2026/09/22 10:25 upstream f0100363d8c3 e12281bd .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/20 10:04 upstream 518e5b794c06 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/19 20:57 upstream 40288c9206c1 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/19 10:33 upstream 40288c9206c1 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/19 03:30 upstream 40288c9206c1 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/18 19:19 upstream 5dd1818b15d9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in update_rq_clock
2026/09/22 20:19 upstream 50d05c7c76c9 3e2106e5 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/22 17:11 upstream 50d05c7c76c9 3e2106e5 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/22 12:13 upstream 50d05c7c76c9 e12281bd .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/22 03:00 upstream 50d05c7c76c9 a8efa948 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/22 02:52 upstream 50d05c7c76c9 a8efa948 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/22 02:49 upstream 50d05c7c76c9 a8efa948 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/21 14:28 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/21 09:14 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/21 07:38 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/21 06:36 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/21 05:02 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/21 02:10 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 20:28 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 17:20 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 14:39 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 12:36 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 08:51 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 07:24 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 05:07 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 03:59 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 03:59 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/20 00:18 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/19 12:51 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/19 11:40 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/19 05:27 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/19 05:27 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/18 22:39 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/18 14:46 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/18 12:39 upstream 50d05c7c76c9 853b104b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/18 10:49 upstream 50d05c7c76c9 8d7d05f1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/18 09:30 upstream 50d05c7c76c9 8d7d05f1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/18 09:30 upstream 50d05c7c76c9 8d7d05f1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/18 03:55 upstream 50d05c7c76c9 8d7d05f1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/17 22:26 upstream 50d05c7c76c9 4a607247 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in update_rq_clock
2026/09/22 21:39 linux-next a8c591ed6b67 3e2106e5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in update_rq_clock
2026/09/18 06:17 linux-next 9d80aa4617b3 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in update_rq_clock
2026/09/13 09:52 linux-next a9d7ced84989 70a60e12 .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.