syzbot


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: 288d, last: 37d
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 Error
61704b0f-416d-4349-99c3-2133fab40c01 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 6b4a844333e83556da95d61d7f207e7ef5cd4bc6

			
		
6e0532b2-c4ef-4051-be7a-c7fd14e4805f assessment-security 💥 INFO: task hung in reg_todo (4) 2026/05/14 11:52 2026/05/14 11:52 2026/05/14 11:53 6ccb967e465e832a7bfd7a116ad00d52a0923a5d
failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128
From /app/workdir/repo/linux
 * branch                HEAD       -> FETCH_HEAD
Updating files:  ...
truncated to first 200 bytes; open job for full error
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 420d 420d 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 469d 469d 0/29 closed as invalid on 2025/04/14 03:52
Last patch testing requests (6)
Created Duration User Patch Repo Result
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/0:0:9 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 (6):
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
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
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
2026/05/10 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.