INFO: task kworker/u8:10:8631 blocked for more than 141 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:10   state:D stack:23240 pid:8631  tgid:8631  ppid:2      task_flags:0x4208160 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1295/0x67a0 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7283
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7340
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0xced/0x1b10 kernel/locking/mutex.c:820
 netdev_wait_allrefs_any net/core/dev.c:11591 [inline]
 netdev_run_todo+0xccd/0x12b0 net/core/dev.c:11711
 ops_exit_rtnl_list net/core/net_namespace.c:189 [inline]
 ops_undo_list+0x904/0xab0 net/core/net_namespace.c:248
 cleanup_net+0x499/0x920 net/core/net_namespace.c:702