BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 241s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=4/256 refcnt=5
    in-flight: 4314:rtc_timer_do_work
    pending: defense_work_handler, cache_reap, push_to_pool
workqueue events_long: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: gc_worker
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=4/256 refcnt=5
    pending: fb_flashcursor, neigh_periodic_work, neigh_periodic_work, check_lifetime
workqueue mm_percpu_wq: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: vmstat_update
workqueue cgroup_destroy: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=4
    pending: css_killed_work_fn
    delayed: css_killed_work_fn, css_release_work_fn
workqueue cgroup_pidlist_destroy: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=7
    pending: cgroup_pidlist_destroy_work_fn
    delayed: cgroup_pidlist_destroy_work_fn, cgroup_pidlist_destroy_work_fn, cgroup_pidlist_destroy_work_fn, cgroup_pidlist_destroy_work_fn, cgroup_pidlist_destroy_work_fn
workqueue dm_bufio_cache: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: work_fn
pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=241s workers=2 idle: 23