BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 39s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
    pending: defense_work_handler, defense_work_handler