BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 56s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=9/256
    pending: vmstat_shepherd, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, dst_gc_task
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
    pending: defense_work_handler, defense_work_handler
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: neigh_periodic_work
workqueue vmstat: flags=0xc
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: vmstat_update
workqueue dm_bufio_cache: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: work_fn