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INFO: task hung in cfg80211_event_work (4)

Status: upstream: reported syz repro on 2024/10/10 15:19
Subsystems: wireless
[Documentation on labels]
Reported-by: syzbot+5506b2556159a1ab6923@syzkaller.appspotmail.com
First crash: 470d, last: 5d12h
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wireless?] INFO: task hung in cfg80211_event_work (4) 3 (5) 2024/10/14 14:38
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in cfg80211_event_work (2) wireless 1 C done error 3 674d 916d 0/29 auto-obsoleted due to no activity on 2024/06/18 14:16
upstream INFO: task hung in cfg80211_event_work (3) wireless 1 1 562d 562d 0/29 auto-obsoleted due to no activity on 2024/09/28 13:35
upstream INFO: task hung in cfg80211_event_work wireless 1 C unreliable error 4 1823d 1856d 0/29 closed as invalid on 2022/02/08 10:49
linux-4.19 INFO: task hung in cfg80211_event_work 1 1 1088d 1088d 0/1 upstream: reported on 2023/01/21 03:03
▶ ▼ Last patch testing requests (11)
Created Duration User Patch Repo Result
2025/12/27 07:50 18m retest repro upstream report log
2025/12/27 07:31 18m retest repro upstream report log
2025/12/25 04:32 18m retest repro upstream report log
2025/12/25 04:32 18m retest repro upstream report log
2025/12/25 04:32 18m retest repro upstream report log
2025/12/25 04:32 18m retest repro upstream report log
2025/12/25 04:32 18m retest repro upstream report log
2025/11/28 07:44 18m retest repro upstream report log
2025/11/28 06:35 18m retest repro upstream report log
2025/10/18 07:29 17m retest repro upstream report log
2024/10/14 02:53 20m lizhi.xu@windriver.com patch upstream report log

Sample crash report:
INFO: task kworker/u4:2:31 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2    state:D stack:24744 pid:31    tgid:31    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: cfg80211 cfg80211_event_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 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
 class_wiphy_constructor include/net/cfg80211.h:6363 [inline]
 cfg80211_event_work+0x29/0x70 net/wireless/core.c:332
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/11 04:09 upstream 0048fbb4011e d1b870e1 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2025/06/27 05:05 upstream f02769e7f272 803ce19b .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2025/03/01 12:33 upstream 276f98efb64a 67cf5345 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2025/02/26 22:21 upstream ac9c34d1e45a 6a8fcbc4 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2025/02/03 04:58 upstream 69e858e0b8b2 568559e4 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2024/11/30 22:11 upstream d8b78066f4c9 68914665 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2024/11/11 15:50 upstream 2d5404caa8c7 0c4b1325 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2024/10/19 04:10 upstream b04ae0f45168 cd6fc0a3 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2024/10/07 01:30 upstream 2a130b7e1fcd d7906eff .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in cfg80211_event_work
2024/10/11 01:51 upstream d3d1556696c1 8fbfc0c8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in cfg80211_event_work
2024/10/11 00:34 upstream d3d1556696c1 8fbfc0c8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in cfg80211_event_work
2024/09/30 08:34 upstream 9852d85ec9d4 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in cfg80211_event_work
2026/01/08 14:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e8c40f11c7b0 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in cfg80211_event_work
2025/12/29 13:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8f0b4cce4481 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in cfg80211_event_work
* Struck through repros no longer work on HEAD.