syzbot


INFO: task hung in rcu_barrier (3)

Status: closed as invalid on 2022/02/07 19:19
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 528d, last: 325d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in rcu_barrier (2) 1 725d 725d 0/24 auto-closed as invalid on 2021/03/12 23:17
upstream INFO: task hung in rcu_barrier 1 1363d 1363d 0/24 auto-closed as invalid on 2019/09/11 09:47

Sample crash report:
INFO: task kworker/u4:3:10809 blocked for more than 175 seconds.
      Not tainted 5.15.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:3    state:D stack:24288 pid:10809 ppid:     2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4969 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6250
 schedule+0xd2/0x260 kernel/sched/core.c:6323
 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x174/0x270 kernel/sched/completion.c:138
 rcu_barrier+0x2db/0x440 kernel/rcu/tree.c:4050
 l2tp_exit_net+0x247/0x500 net/l2tp/l2tp_core.c:1669
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (13):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2021/11/06 02:47 upstream d4439a1189f9 4c1be0be .config log report info INFO: task hung in rcu_barrier
ci-upstream-net-this-kasan-gce 2021/12/30 18:19 net f7397cd24c59 2e49f10d .config log report info INFO: task hung in rcu_barrier
ci-upstream-net-this-kasan-gce 2021/12/08 17:47 net b5bd95d17102 a4a2a501 .config log report info INFO: task hung in rcu_barrier
ci-upstream-net-this-kasan-gce 2021/11/29 09:14 net c5c17547b778 63eeac02 .config log report info INFO: task hung in rcu_barrier
ci-upstream-net-kasan-gce 2021/09/23 22:54 net-next 68a81bb2eebd 8cac236e .config log report info INFO: task hung in rcu_barrier
ci-upstream-net-kasan-gce 2021/06/27 10:24 net-next ff8744b5eb11 9d2ab5df .config log report info INFO: task hung in rcu_barrier
ci-upstream-linux-next-kasan-gce-root 2021/11/06 19:37 linux-next 6a37ebbe07bf 4c1be0be .config log report info INFO: task hung in rcu_barrier
ci-upstream-linux-next-kasan-gce-root 2021/11/02 15:16 linux-next 9150de4aac1e 098b5d53 .config log report info INFO: task hung in rcu_barrier
ci-upstream-linux-next-kasan-gce-root 2021/10/11 07:17 linux-next 683f29b781ae 838e7e2c .config log report info INFO: task hung in rcu_barrier
ci-upstream-linux-next-kasan-gce-root 2021/10/03 19:38 linux-next a25006a77348 db0f5787 .config log report info INFO: task hung in rcu_barrier
ci-upstream-linux-next-kasan-gce-root 2022/01/16 18:25 linux-next 70e6f1b39929 723cfaf0 .config log report info INFO: task can't die in rcu_barrier
ci-upstream-linux-next-kasan-gce-root 2021/12/23 01:44 linux-next 2bd48302750c 6caa12e4 .config log report info INFO: task can't die in rcu_barrier
ci-upstream-linux-next-kasan-gce-root 2021/11/08 13:06 linux-next e844ee04dee0 d29682f1 .config log report info INFO: task can't die in rcu_barrier
* Struck through repros no longer work on HEAD.