WARNING in rcu_tasks_verify_work_fn

Status: upstream: reported on 2026/03/31 21:53
Subsystems: kernel
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+251e9abcdac140e7ec74@syzkaller.appspotmail.com
First crash: 175d, last: 2h49m
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ID Workflow Result Correct Bug Created Started Finished Revision
f65ca737 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in rcu_tasks_verify_work_fn 2026/05/26 01:24 2026/05/26 01:24 2026/05/26 01:51 c69befb3
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH AUTOSEL 6.18-5.10] wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() 8 (8) 2026/08/31 13:30
[PATCH] rcu-tasks: Dump rcu tasks status when the boot-test failed 1 (1) 2026/07/06 10:03
[PATCH] rcu-tasks: Fix possible boot-time tests failed for the call_rcu_tasks() 1 (1) 2026/04/23 11:19
[syzbot] [kernel?] WARNING in rcu_tasks_verify_work_fn 0 (1) 2026/03/31 21:53

Sample crash report:
input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input2
input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input4
call_rcu_tasks() has failed boot-time tests.
rcu_tasks: RTGS_WAIT_SCAN_HOLDOUTS(6) since 56 g:5 i:0 kCuUP l:25 
------------[ cut here ]------------
ret < 0
WARNING: kernel/rcu/tasks.h:1541 at rcu_tasks_verify_self_tests kernel/rcu/tasks.h:1541 [inline], CPU#0: kworker/0:2/988
WARNING: kernel/rcu/tasks.h:1541 at rcu_tasks_verify_work_fn+0x1b6/0x270 kernel/rcu/tasks.h:1553, CPU#0: kworker/0:2/988
Modules linked in:
CPU: 0 UID: 0 PID: 988 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events rcu_tasks_verify_work_fn
RIP: 0010:rcu_tasks_verify_self_tests kernel/rcu/tasks.h:1541 [inline]
RIP: 0010:rcu_tasks_verify_work_fn+0x1b6/0x270 kernel/rcu/tasks.h:1553
Code: 80 3c 10 00 0f 85 b5 00 00 00 48 8b 35 5b 6a 77 0c b9 64 00 00 00 bf 08 00 00 00 48 c7 c2 a0 ea 99 9b e8 ad 6d e2 ff eb 97 90 <0f> 0b 90 eb 91 48 89 df e8 3d 8d 8f 00 e9 69 ff ff ff 48 89 df e8
RSP: 0000:ffffc90004e47bb0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8edeb928 RCX: 0000000000000000
RDX: 1ffffffff1dbd725 RSI: ffffffff81e97b49 RDI: fffff520009c8f49
RBP: 1ffff920009c8f76 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000000 R11: 0000000000000001 R12: 0000000000000bb8
R13: 00000000ffffffff R14: 0000000000000001 R15: ffffffff8edeb928
FS:  0000000000000000(0000) GS:ffff888123b5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823ffff000 CR3: 000000000eb96000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 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 (477):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/19 08:00 upstream 40288c9206c1 853b104b .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/19 06:38 upstream f259f446f519 853b104b .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/19 03:45 upstream f259f446f519 853b104b .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/19 00:58 upstream ef31d04b6d8a 8d7d05f1 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/18 23:13 upstream f259f446f519 853b104b .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/18 20:45 upstream f259f446f519 853b104b .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/18 20:32 upstream f259f446f519 853b104b .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/18 18:38 upstream f259f446f519 853b104b .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/18 16:45 upstream 4982d3552a3b 853b104b .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/18 08:20 upstream 4982d3552a3b 8d7d05f1 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/18 04:54 upstream 4982d3552a3b 8d7d05f1 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/18 03:26 upstream 4982d3552a3b 8d7d05f1 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 23:37 upstream 4982d3552a3b 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/17 21:41 upstream 4982d3552a3b 4a607247 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 20:39 upstream 4982d3552a3b 4a607247 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 19:01 upstream 4982d3552a3b 4a607247 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 16:26 upstream 238650ef6c7c 4a607247 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 14:29 upstream 238650ef6c7c 4a607247 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 13:16 upstream 238650ef6c7c 4a607247 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 10:25 upstream 238650ef6c7c 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 09:17 upstream 238650ef6c7c 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 07:16 upstream 238650ef6c7c 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/17 04:33 upstream 238650ef6c7c 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/17 03:08 upstream 238650ef6c7c 95928915 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 21:23 upstream 9b87fdc9af2f b0e4c57e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 19:30 upstream 9b87fdc9af2f b0e4c57e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 19:16 upstream 9b87fdc9af2f b0e4c57e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 18:08 upstream 9b87fdc9af2f b0e4c57e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 16:09 upstream 9b87fdc9af2f b0e4c57e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 15:03 upstream 9b87fdc9af2f b0e4c57e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 10:56 upstream 9b87fdc9af2f 12a0a44a .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/16 08:51 upstream f6e7b42bf05b 12a0a44a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 07:16 upstream f6e7b42bf05b 12a0a44a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 05:31 upstream f6e7b42bf05b 12a0a44a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 02:23 upstream f6e7b42bf05b 12a0a44a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/16 01:31 upstream f6e7b42bf05b 12a0a44a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 23:55 upstream f6e7b42bf05b 81a27d1a .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/15 17:39 upstream 587858367581 f41e228a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 15:20 upstream 587858367581 f41e228a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 14:16 upstream 587858367581 f41e228a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 12:37 upstream 587858367581 f41e228a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 10:33 upstream 587858367581 81a27d1a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 08:42 upstream 587858367581 81a27d1a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 02:29 upstream 587858367581 81a27d1a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 01:40 upstream 587858367581 81a27d1a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/15 00:21 upstream 587858367581 81a27d1a .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/14 21:51 upstream 704340f1cd0d 924033e8 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/14 17:55 upstream 704340f1cd0d 924033e8 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/06/25 12:48 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next 319fafd9a374 432fd51a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in rcu_tasks_verify_work_fn
2026/04/27 05:43 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next 9b3a2be84803 9c2d0995 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in rcu_tasks_verify_work_fn
2026/03/27 22:12 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next b335bc5892a0 158c21af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in rcu_tasks_verify_work_fn
2026/03/27 21:42 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next b335bc5892a0 158c21af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in rcu_tasks_verify_work_fn
* Struck through repros no longer work on HEAD.