BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 244s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=5/256 refcnt=6
    in-flight: 7983:rtc_timer_do_work
    pending: defense_work_handler, vmstat_shepherd, cache_reap, push_to_pool
workqueue events_long: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: gc_worker
workqueue events_freezable: flags=0x4
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: update_balloon_stats_func
workqueue events_power_efficient: flags=0x80
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=5/256 refcnt=6
    pending: fb_flashcursor, neigh_periodic_work, neigh_periodic_work, do_cache_clean, check_lifetime
workqueue mm_percpu_wq: flags=0x8
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: vmstat_update
workqueue dm_bufio_cache: flags=0x8
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: work_fn
pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=244s workers=3 idle: 4647 23