BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 30s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    in-flight: 22:request_firmware_work_func
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=8/256 refcnt=9
    pending: psi_avgs_work, vmstat_shepherd, ovs_dp_masks_rebalance, l2cap_info_timeout, l2cap_info_timeout, ovs_dp_masks_rebalance, ovs_dp_masks_rebalance, kfree_rcu_monitor
workqueue events_long: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
    pending: defense_work_handler, defense_work_handler
workqueue events_power_efficient: flags=0x82
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=5/256 refcnt=7
    pending: neigh_periodic_work, neigh_managed_work, do_cache_clean, neigh_periodic_work, gc_worker
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
workqueue krxrpcd: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=4
    pending: rxrpc_peer_keepalive_worker
    inactive: rxrpc_peer_keepalive_worker, rxrpc_peer_keepalive_worker
workqueue hci1: flags=0xa0012
  pwq 5: cpus=0-1 flags=0x4 nice=-20 active=1/1 refcnt=3
    pending: hci_cmd_timeout
pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=0s workers=5 idle: 4019 1954 4240 24