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INFO: task hung in reg_check_chans_work (2)

Status: upstream: reported C repro on 2026/01/11 01:10
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+54c26125ad12e8834691@syzkaller.appspotmail.com
First crash: 66d, last: 45d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/01/23 linux-6.6.y (ToT) cbb31f77b879 C [report] INFO: task hung in corrupted
2026/01/23 upstream (ToT) a66191c590b3 C Didn't crash
▶ ▼ Similar bugs (16)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in reg_check_chans_work 1 10 496d 781d 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 452d 452d 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 C error 129 619d 692d 26/29 fixed on 2024/07/09 19:14
upstream INFO: task hung in reg_check_chans_work (3) wireless 1 60 1564d 1627d 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 1409d 1409d 0/1 auto-obsoleted due to no activity on 2022/09/05 08:58
upstream INFO: task hung in reg_check_chans_work (7) wireless 1 C error 869 1d13h 540d 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 1356d 1359d 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 167d 273d 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 95d 120d 0/3 upstream: reported syz repro on 2025/11/18 03:08
upstream INFO: task hung in reg_check_chans_work net 1 15 2894d 2953d 0/29 closed as dup on 2018/02/14 15:33
linux-6.1 INFO: task hung in reg_check_chans_work (3) 1 1 345d 345d 0/3 auto-obsoleted due to no activity on 2025/07/15 07:58
android-44 INFO: task hung in reg_check_chans_work 1 18 2866d 2940d 0/2 auto-closed as invalid on 2019/02/22 14:50
android-49 INFO: task hung in reg_check_chans_work 1 18 2865d 2963d 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 643d 661d 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 870d 999d 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 1988d 1997d 0/29 auto-closed as invalid on 2021/01/04 12:48
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2026/02/23 17:09 0m fix candidate upstream error job log
2026/01/24 07:01 1m fix candidate upstream error job log

Sample crash report:
INFO: task kworker/1:0:23 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0     state:D stack:22984 pid:23    ppid:2      flags:0x00004000
Workqueue: events_power_efficient reg_check_chans_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
 wiphy_lock include/net/cfg80211.h:5777 [inline]
 reg_leave_invalid_chans net/wireless/reg.c:2451 [inline]
 reg_check_chans_work+0x10a/0xd90 net/wireless/reg.c:2466
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/17 13:46 linux-6.6.y c596736dadab 20d37d28 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in reg_check_chans_work
2026/01/31 13:06 linux-6.6.y 2cf6f68313dc afc0c4d4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in reg_check_chans_work
2026/01/11 01:10 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in reg_check_chans_work
* Struck through repros no longer work on HEAD.