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: 212d, last: 10d
▶ ▼ 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 (17)
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 643d 927d 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 599d 599d 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 766d 839d 26/29 fixed on 2024/07/09 19:14
upstream INFO: task hung in reg_check_chans_work (3) wireless 1 60 1711d 1774d 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 1556d 1556d 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 1094 11h17m 687d 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 1503d 1505d 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 313d 420d 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 242d 266d 0/3 upstream: reported syz repro on 2025/11/18 03:08
upstream INFO: task hung in reg_check_chans_work net 1 15 3041d 3100d 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 492d 492d 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 3013d 3086d 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 93d 93d 0/3 upstream: reported on 2026/05/10 19:53
android-49 INFO: task hung in reg_check_chans_work 1 18 3012d 3110d 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 790d 807d 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 1017d 1146d 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 2135d 2144d 0/29 auto-closed as invalid on 2021/01/04 12:48
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2026/07/09 09:06 2h32m fix candidate upstream OK (0) job log
2026/06/09 06:08 13m fix candidate upstream error job log
2026/03/26 05:47 0m fix candidate upstream error job log
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:27304 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

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/05 21:13 linux-6.6.y 08667c1437c0 4440e7c2 .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
2026/01/17 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
2026/08/01 09:07 linux-6.6.y a1153c0deb44 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in reg_check_chans_work
2026/06/15 20:43 linux-6.6.y 924b4a879cbb 50bb0618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in reg_check_chans_work
2026/04/18 17:02 linux-6.6.y 9760bf04666d 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in reg_check_chans_work
2026/04/11 11:27 linux-6.6.y 80de0a958133 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in reg_check_chans_work
2026/03/28 01:17 linux-6.6.y c09fbcd31ae6 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in reg_check_chans_work
2026/01/31 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.