INFO: task hung in reg_todo (4)

Status: upstream: reported C repro on 2025/12/26 20:18
Subsystems: wireless
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+8f72a490f8e8879ee7e6@syzkaller.appspotmail.com
First crash: 370d, last: 15h16m
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
61704b0f assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ INFO: task hung in reg_todo (4) 2026/05/30 20:55 2026/05/30 20:55 2026/05/30 22:10 6b4a8443
6e0532b2 assessment-security 💥 INFO: task hung in reg_todo (4) 2026/05/14 11:52 2026/05/14 11:52 2026/05/14 11:53 6ccb967e
▶ ▼ 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 502d 502d 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 551d 551d 0/29 closed as invalid on 2025/04/14 03:52
▶ ▼ Last patch testing requests (8)
Created Duration User Patch Repo Result
2026/08/26 10:34 26m retest repro upstream no crash job log log
2026/06/28 17:32 28m retest repro net-next log
2026/06/11 03:31 27m retest repro upstream log
2026/06/11 02:12 1h27m retest repro upstream log
2026/04/19 13:18 47m retest repro net-next report log
2026/04/01 23:33 38m retest repro upstream report log
2026/01/05 20:40 40m retest repro upstream report log
2026/01/05 20:38 18m retest repro upstream error

Sample crash report:
INFO: task kworker/0:1:10 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:1     state:D stack:25952 pid:10    tgid:10    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events reg_todo
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7065
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
 reg_todo+0x1c/0xa50 net/wireless/reg.c:3202
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/05 01:51 net-next 3741f8fa004b 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in reg_todo
2026/09/05 05:22 upstream 654ae5d73c05 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in reg_todo
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
2026/09/05 19:43 upstream 654ae5d73c05 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in reg_todo
2026/09/03 16:50 net 544d85de4dc2 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in reg_todo
2026/09/02 00:47 net 1d2929d0850f 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in reg_todo
2026/09/04 11:05 net-next 7042c8c193e5 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in reg_todo
2026/09/01 11:06 net-next 25c1f6111034 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in reg_todo
2026/08/06 19:51 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in reg_todo
2026/05/10 07:28 linux-next e98d21c170b0 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in reg_todo
2026/04/29 17:41 linux-next 0787c45ea08a 804ea88f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in reg_todo
* Struck through repros no longer work on HEAD.