syzbot


INFO: task hung in worker_thread

Status: auto-closed as invalid on 2022/05/08 06:12
Reported-by: syzbot+b66a54896f60c72f0d9d@syzkaller.appspotmail.com
First crash: 832d, last: 832d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in worker_thread (3) serial 1 425d 425d 0/26 auto-obsoleted due to no activity on 2023/05/20 16:01
upstream INFO: task hung in worker_thread (4) kernel 1 109d 109d 0/26 auto-obsoleted due to no activity on 2024/03/31 02:07
upstream INFO: task hung in worker_thread (2) fs 1 1185d 1185d 0/26 auto-closed as invalid on 2021/05/17 11:26
upstream INFO: task hung in worker_thread fs 1 1350d 1350d 0/26 auto-closed as invalid on 2020/11/06 03:23

Sample crash report:
netlink: 'syz-executor.1': attribute type 10 has an invalid length.
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
ieee802154 phy0 wpan0: encryption failed: -22
ieee802154 phy1 wpan1: encryption failed: -22
INFO: task kworker/1:2:3394 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:2     I25784  3394      2 0x80000000
Workqueue:            (null) (events)
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 worker_thread+0x14c/0x1130 kernel/workqueue.c:2317
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Showing all locks held in the system:
2 locks held by kworker/0:1/14:
 #0: 00000000f31539c3 ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 000000000e0ce072 ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
1 lock held by khungtaskd/1562:
 #0: 0000000009dfa819 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
4 locks held by kworker/u4:5/3573:
 #0: 000000000ae16d03 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 000000003593e08b (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
 #2: 0000000002faca04 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521
 #3: 00000000c3d00ae9 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline]
 #3: 00000000c3d00ae9 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455
1 lock held by in:imklog/7797:
 #0: 0000000008a50c93 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/01/08 06:12 linux-4.19.y 3f8a27f9e27b 2ca0d385 .config console log report info ci2-linux-4-19 INFO: task hung in worker_thread
* Struck through repros no longer work on HEAD.