INFO: task hung in reg_check_chans_work (3)

Status: auto-obsoleted due to no activity on 2025/07/15 07:58
Reported-by: syzbot+8e8f0f982cb11244072e@syzkaller.appspotmail.com
First crash: 498d, last: 498d
▶ ▼ Similar bugs (17)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 INFO: task hung in reg_check_chans_work (2) origin:lts-only 1 syz, C inconclusive 9 16d 218d 0/2 upstream: reported C repro on 2026/01/11 01:10
linux-5.15 INFO: task hung in reg_check_chans_work 1 10 648d 933d 0/3 auto-obsoleted due to no activity on 2025/02/14 20:30
linux-6.1 INFO: task hung in reg_check_chans_work (2) 1 1 604d 604d 0/3 auto-obsoleted due to no activity on 2025/03/30 18:04
upstream INFO: task hung in reg_check_chans_work (6) wireless 1 syz, C error 129 771d 845d 26/29 fixed on 2024/07/09 19:14
upstream INFO: task hung in reg_check_chans_work (3) wireless 1 60 1716d 1780d 0/29 auto-closed as invalid on 2022/04/03 20:03
linux-4.14 INFO: task hung in reg_check_chans_work 1 1 1562d 1562d 0/1 auto-obsoleted due to no activity on 2022/09/05 08:58
upstream INFO: task hung in reg_check_chans_work (7) prio:normal wireless 1 syz, C error 1112 49m 693d 0/29 upstream: reported C repro on 2024/09/23 08:39
upstream INFO: task hung in reg_check_chans_work (4) wireless 1 4 1508d 1511d 0/29 auto-closed as invalid on 2022/09/28 14:08
linux-6.6 INFO: task hung in reg_check_chans_work 1 5 319d 425d 0/2 auto-obsoleted due to no activity on 2026/01/10 01:05
linux-6.1 INFO: task hung in reg_check_chans_work (4) origin:lts-only 1 syz error 2 248d 272d 0/3 upstream: reported syz repro on 2025/11/18 03:08
upstream INFO: task hung in reg_check_chans_work net 1 15 3046d 3105d 0/29 closed as dup on 2018/02/14 15:33
android-44 INFO: task hung in reg_check_chans_work 1 18 3018d 3092d 0/2 auto-closed as invalid on 2019/02/22 14:50
linux-5.15 INFO: task hung in reg_check_chans_work (2) 1 1 98d 98d 0/3 upstream: reported on 2026/05/10 19:53
android-49 INFO: task hung in reg_check_chans_work 1 18 3018d 3115d 0/3 auto-closed as invalid on 2019/02/22 15:19
linux-6.1 INFO: task hung in reg_check_chans_work 1 3 795d 813d 0/3 auto-obsoleted due to no activity on 2024/09/20 17:51
upstream INFO: task hung in reg_check_chans_work (5) wireless 1 26 1023d 1151d 0/29 auto-obsoleted due to no activity on 2024/01/08 12:17
upstream INFO: task hung in reg_check_chans_work (2) wireless 1 3 2141d 2149d 0/29 auto-closed as invalid on 2021/01/04 12:48

Sample crash report:
INFO: task kworker/1:7:4298 blocked for more than 143 seconds.
      Not tainted 6.1.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:7     state:D stack:22016 pid:4298  ppid:2      flags:0x00004000
Workqueue: events_power_efficient reg_check_chans_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 schedule+0xbf/0x180 kernel/sched/core.c:6637
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 reg_check_chans_work+0x8d/0xdb0 net/wireless/reg.c:2499
 process_one_work+0x917/0x1260 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task syz.4.308:5408 blocked for more than 149 seconds.
      Not tainted 6.1.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.308       state:D stack:25864 pid:5408  ppid:4249   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 schedule+0xbf/0x180 kernel/sched/core.c:6637
 synchronize_rcu_expedited+0x777/0x930 kernel/rcu/tree_exp.h:977

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/06 07:57 linux-6.1.y 8e60a714ba3b 1c65791e .config console log report info ci2-linux-6-1-kasan-perf INFO: task hung in reg_check_chans_work
* Struck through repros no longer work on HEAD.