INFO: task hung in reg

INFO: task hung in reg_todo (4)

Status: upstream: reported C repro on 2025/12/26 20:18
Subsystems: wireless
[Documentation on labels]
Reported-by: syzbot+8f72a490f8e8879ee7e6@syzkaller.appspotmail.com
First crash: 122d, last: 9d15h

Cause bisection: failed (error log, bisect log)

▶ ▼ Discussions (1)

Title	Replies (including bot)	Last reply
[syzbot] [wireless?] INFO: task hung in reg_todo (4)	0 (1)	2025/12/26 20:18

▶ ▼ Similar bugs (2)

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in reg_todo (3) wireless	1				1	254d	254d	0/29	auto-obsoleted due to no activity on 2025/07/20 20:01
upstream	INFO: task hung in reg_todo (2) wireless	1	syz			3	303d	303d	0/29	closed as invalid on 2025/04/14 03:52

Sample crash report:

INFO: task kworker/0:0:9 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:23672 pid:9     tgid:9     ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events reg_todo
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
 reg_todo+0x1c/0xa60 net/wireless/reg.c:3189

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/12/22 20:04	upstream	9448598b22c5	d6526ea3	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce	INFO: task hung in reg_todo
2025/10/09 10:29	upstream	ec714e371f22	7e2882b3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-qemu-gce-upstream-auto	INFO: task hung in reg_todo
2025/09/01 03:17	upstream	5c3b3264e585	807a3b61	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-qemu-gce-upstream-auto	INFO: task hung in reg_todo

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