BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 54s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: jump_label_update_timeout
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
    in-flight: 3:key_garbage_collector key_garbage_collector
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: gc_worker
workqueue kblockd: flags=0x18
  pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256
    pending: cfq_kick_queue
pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=0s workers=6 idle: 24 5080 1303 6668 12534