INFO: task hung in switchdev_deferred_process_work

Status: auto-obsoleted due to no activity on 2022/09/03 16:45
Reported-by: syzbot+0bc7cdde131f94f707d4@syzkaller.appspotmail.com
First crash: 1539d, last: 1539d
▶ ▼ Similar bugs (14)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 INFO: task hung in switchdev_deferred_process_work (2) 1 11 12d 233d 0/2 upstream: reported on 2025/12/02 15:22
linux-6.1 INFO: task hung in switchdev_deferred_process_work (2) 1 1 305d 305d 0/3 auto-obsoleted due to no activity on 2025/12/31 08:30
linux-6.1 INFO: task hung in switchdev_deferred_process_work (3) 1 1 64d 64d 0/3 upstream: reported on 2026/05/20 16:07
linux-5.15 INFO: task hung in switchdev_deferred_process_work (5) 1 1 57d 57d 0/3 upstream: reported on 2026/05/27 14:28
upstream INFO: task hung in switchdev_deferred_process_work (2) net 1 C inconclusive 1226 745d 2187d 26/29 fixed on 2024/07/09 19:14
linux-6.6 INFO: task hung in switchdev_deferred_process_work 1 1 366d 366d 0/2 auto-obsoleted due to no activity on 2025/10/31 04:22
upstream INFO: task hung in switchdev_deferred_process_work net 1 35 2477d 3014d 0/29 closed as invalid on 2019/10/23 07:26
upstream INFO: task hung in switchdev_deferred_process_work (3) net 1 C inconclusive 655 3d06h 714d 0/29 upstream: reported C repro on 2024/08/08 21:14
linux-5.15 INFO: task hung in switchdev_deferred_process_work (4) 1 2 216d 225d 0/3 auto-obsoleted due to no activity on 2026/03/29 12:57
linux-5.15 INFO: task hung in switchdev_deferred_process_work 1 1 1199d 1199d 0/3 auto-obsoleted due to no activity on 2023/08/10 05:46
linux-4.19 INFO: task hung in switchdev_deferred_process_work 1 95 1251d 2329d 0/1 upstream: reported on 2020/03/08 04:06
linux-5.15 INFO: task hung in switchdev_deferred_process_work (2) 1 36 852d 924d 0/3 auto-obsoleted due to no activity on 2024/06/01 16:21
linux-5.15 INFO: task hung in switchdev_deferred_process_work (3) 1 8 637d 779d 0/3 auto-obsoleted due to no activity on 2025/02/02 03:46
linux-6.1 INFO: task hung in switchdev_deferred_process_work 1 8 744d 907d 0/3 auto-obsoleted due to no activity on 2024/10/18 09:59

Sample crash report:
INFO: task kworker/1:1:23 blocked for more than 140 seconds.
      Not tainted 4.14.277-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:1     D26720    23      2 0x80000000
Workqueue: events switchdev_deferred_process_work
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3387
 schedule+0x8d/0x1b0 kernel/sched/core.c:3431
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/05/06 16:45 linux-4.14.y e3a56aaade89 e60b1103 .config console log report info ci2-linux-4-14 INFO: task hung in switchdev_deferred_process_work
* Struck through repros no longer work on HEAD.