BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 238s!
BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=-20 stuck for 236s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: kfree_rcu_monitor
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 refcnt=5