BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 159s!
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
pending: 4*ovs_dp_masks_rebalance
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 refcnt=4
pending: vmstat_shepherd, psi_avgs_work, ovs_dp_masks_rebalance
workqueue events_long: flags=0x0
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
pending: 2*defense_work_handler
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 refcnt=4
pending: 3*defense_work_handler
workqueue events_unbound: flags=0x2
pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/512 refcnt=2
pending: toggle_allocation_gate
pwq 4: cpus=0-1 flags=0x4 nice=0 active=2/512 refcnt=3
pending: flush_memcg_stats_dwork, crng_reseed
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 2: cpus=1 node=0 flags=0x0 nice=0 active=5/256 refcnt=6
pending: do_cache_clean, 2*neigh_managed_work, 2*neigh_periodic_work
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 refcnt=4
pending: gc_worker, reg_check_chans_work, check_lifetime
workqueue rcu_gp: flags=0x8
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wait_rcu_exp_gp
workqueue mm_percpu_wq: flags=0x8
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: vmstat_update
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: vmstat_update
workqueue writeback: flags=0x4a
pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=2
pending: wb_workfn
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 ipv6_addrconf: flags=0x40008
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=2
pending: addrconf_verify_work
workqueue krxrpcd: flags=0xa001a
pwq 5: cpus=0-1 node=0 flags=0x4 nice=-20 active=1/1 refcnt=8
pending: rxrpc_peer_keepalive_worker
inactive: 4*rxrpc_peer_keepalive_worker
Showing backtraces of running workers in stalled CPU-bound worker pools: