BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 270s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=6/256 refcnt=7
    in-flight: 9026:free_obj_work
    pending: free_obj_work, defense_work_handler, defense_work_handler, vmstat_shepherd, cache_reap
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_unbound: flags=0x2
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=2/512 refcnt=5
    in-flight: 9347:fsnotify_mark_destroy_workfn, 7955:fsnotify_connector_destroy_workfn
workqueue events_freezable: flags=0x4
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: update_balloon_stats_func
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: fb_flashcursor
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: process_srcu
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 kblockd: flags=0x18
  pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256 refcnt=2
    pending: blk_mq_run_work_fn
  pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256 refcnt=2
    pending: blk_mq_timeout_work
workqueue bat_events: flags=0xe000a
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=6
    pending: batadv_nc_worker
    delayed: batadv_nc_worker, batadv_nc_worker
pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=0s workers=5 idle: 7958 7994 9229 24
pool 4: cpus=0-1 flags=0x4 nice=0 hung=0s workers=7 idle: 2962 9227 8397 8181 8076