syzbot

BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 154s!
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 154s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=8 refcnt=9
    pending: vmstat_shepherd, ovs_dp_masks_rebalance, 4*l2cap_info_timeout, ovs_dp_masks_rebalance, kfree_rcu_monitor
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=4 refcnt=5
    pending: psi_avgs_work, l2cap_info_timeout, ovs_dp_masks_rebalance, kfree_rcu_monitor
workqueue events_long: flags=0x0
  pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
    pending: 2*defense_work_handler
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=4 refcnt=5
    pending: 4*defense_work_handler
workqueue events_unbound: flags=0x2
  pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2
    pending: flush_memcg_stats_dwork
  pwq 8: cpus=0-1 flags=0x4 nice=0 active=2 refcnt=3
    pending: toggle_allocation_gate, crng_reseed
workqueue events_freezable: flags=0x4
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2
    pending: update_balloon_stats_func
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
    pending: neigh_managed_work, neigh_periodic_work, do_cache_clean
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=5 refcnt=6
    pending: neigh_managed_work, gc_worker, neigh_periodic_work, check_lifetime, reg_check_chans_work
workqueue mm_percpu_wq: flags=0x8
  pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
    pending: vmstat_update
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2
    pending: vmstat_update
workqueue writeback: flags=0x4a
  pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2
    pending: wb_workfn
workqueue kblockd: flags=0x18
  pwq 3: cpus=0 node=0 flags=0x0 nice=-20 active=1 refcnt=2
    pending: blk_mq_timeout_work
workqueue dm_bufio_cache: flags=0x8
  pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
    pending: work_fn
workqueue ipv6_addrconf: flags=0x6000a
  pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=4
    pending: addrconf_verify_work
workqueue krxrpcd: flags=0x2001a
  pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=6
    pending: rxrpc_peer_keepalive_worker
    inactive: 2*rxrpc_peer_keepalive_worker
workqueue hci0: flags=0x20012
  pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=5
    pending: hci_cmd_timeout
    inactive: hci_conn_timeout
workqueue hci1: flags=0x20012
  pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=5
    pending: hci_cmd_timeout
    inactive: hci_conn_timeout
workqueue hci2: flags=0x20012
  pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=5
    pending: hci_cmd_timeout
    inactive: hci_conn_timeout
workqueue hci3: flags=0x20012
  pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=5
    pending: hci_cmd_timeout
    inactive: hci_conn_timeout
workqueue hci4: flags=0x20012
  pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=5
    pending: hci_cmd_timeout
    inactive: hci_conn_timeout
Showing backtraces of running workers in stalled CPU-bound worker pools: