BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 155s! BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 157s! BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=-20 stuck for 155s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=8/256 refcnt=9 pending: 3*nsim_dev_hwstats_traffic_work, psi_avgs_work, 2*ovs_dp_masks_rebalance, kfree_rcu_monitor, psi_avgs_work pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=9/256 refcnt=10 pending: nsim_dev_hwstats_traffic_work, free_obj_work, 2*psi_avgs_work, vmstat_shepherd, psi_avgs_work, 3*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=14/512 refcnt=15 pending: 2*nsim_dev_trap_report_work, toggle_allocation_gate, 2*nsim_dev_trap_report_work, 4*cfg80211_wiphy_work, linkwatch_event, 4*macvlan_process_broadcast pwq 4: cpus=0-1 flags=0x4 nice=0 active=9/512 refcnt=10 pending: 3*cfg80211_wiphy_work, flush_memcg_stats_dwork, 4*macvlan_process_broadcast, 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: wg_ratelimiter_gc_entries, neigh_managed_work, neigh_periodic_work, reg_check_chans_work, check_lifetime pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 refcnt=5 pending: neigh_managed_work, neigh_periodic_work, gc_worker, do_cache_clean 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 writeback: flags=0x4a pwq 4: cpus=0-1 flags=0x4 nice=0 active=3/256 refcnt=4 pending: 3*wb_workfn workqueue kblockd: flags=0x18 pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=3/256 refcnt=4 pending: 3*blk_mq_timeout_work pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256 refcnt=2 pending: blk_mq_timeout_work workqueue usb_hub_wq: flags=0x4 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 in-flight: 28:hub_event hub_event workqueue dm_bufio_cache: flags=0x8 pwq 2: cpus=1 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=4 pending: addrconf_verify_work inactive: 2*addrconf_verify_work pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=3 pending: addrconf_verify_work inactive: 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 workqueue krdsd: flags=0xe000a pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: rds_connect_worker workqueue bat_events: flags=0xe000a pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=39 pending: batadv_nc_worker inactive: 3*batadv_nc_worker, batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, 3*batadv_mcast_mla_update, 2*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, batadv_mcast_mla_update, 2*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, 7*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, 4*batadv_tt_purge, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work workqueue hci0: flags=0xa0012 pwq 5: cpus=0-1 node=0 flags=0x4 nice=-20 active=1/1 refcnt=4 pending: hci_conn_timeout workqueue hci1: flags=0xa0012 pwq 5: cpus=0-1 node=0 flags=0x4 nice=-20 active=1/1 refcnt=4 pending: hci_conn_timeout workqueue hci3: flags=0xa0012 pwq 5: cpus=0-1 node=0 flags=0x4 nice=-20 active=1/1 refcnt=4 pending: hci_conn_timeout workqueue hci2: flags=0xa0012 pwq 5: cpus=0-1 node=0 flags=0x4 nice=-20 active=1/1 refcnt=4 pending: hci_conn_timeout workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=158s workers=10 idle: 55 23 5839 5782 5885 5847 5796 5886 5860 Showing backtraces of running workers in stalled CPU-bound worker pools: pool 2: task:kworker/1:1 state:R running task stack:21448 pid:28 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x14e2/0x4580 kernel/sched/core.c:6700 schedule+0xbd/0x170 kernel/sched/core.c:6774 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167 schedule_timeout_uninterruptible kernel/time/timer.c:2201 [inline] msleep+0xa1/0xe0 kernel/time/timer.c:2322 hub_port_wait_reset drivers/usb/core/hub.c:2900 [inline] hub_port_reset+0x5b1/0x1740 drivers/usb/core/hub.c:3028 hub_port_init+0xf7a/0x2760 drivers/usb/core/hub.c:4990 hub_port_connect drivers/usb/core/hub.c:5430 [inline] hub_port_connect_change drivers/usb/core/hub.c:5641 [inline] port_event drivers/usb/core/hub.c:5801 [inline] hub_event+0x2513/0x49c0 drivers/usb/core/hub.c:5883 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293