INFO: task hung in pwq_release

INFO: task hung in pwq_release_workfn (2)

Status: auto-obsoleted due to no activity on 2026/04/18 16:17
Subsystems: kernel
[Documentation on labels]
First crash: 99d, last: 99d

▶ ▼ ✨ AI Jobs (1)

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
5101cfd1-563b-44fa-9c89-110544455e61	repro		❓	INFO: task hung in pwq_release_workfn (2)	2026/03/06 13:09	2026/03/06 13:09	2026/03/06 13:19	31e9c887f7dc24e04b3ca70d0d54fc34141844b0

▶ ▼ Similar bugs (1)

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in pwq_release_workfn net	1				1	345d	345d	0/29	auto-obsoleted due to no activity on 2025/08/15 06:35

Sample crash report:

INFO: task pool_workqueue_:3 blocked for more than 144 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:pool_workqueue_ state:D stack:27568 pid:3     tgid:3     ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
 pwq_release_workfn+0x3dc/0x870 kernel/workqueue.c:5127
 kthread_worker_fn+0x4f0/0xb20 kernel/kthread.c:1005
 kthread+0x711/0x8a0 kernel/kthread.c:463

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/01/18 16:16	upstream	e84d960149e7	d6526ea3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-root	INFO: task hung in pwq_release_workfn

* ~~Struck through~~ repros no longer work on HEAD.