ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 176s! Showing busy workqueues and worker pools: workqueue events: flags=0x100 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=8 refcnt=9 pending: 2*nsim_dev_hwstats_traffic_work, psi_avgs_work, vmstat_shepherd, 4*ovs_dp_masks_rebalance pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=2 refcnt=3 in-flight: 17436:nsim_fib_event_work for 176s pending: nsim_fib_event_work workqueue events_long: flags=0x100 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=9 refcnt=10 pending: 7*defense_work_handler, 2*br_fdb_cleanup workqueue events_unbound: flags=0x2 pwq 8: cpus=0-1 flags=0x4 nice=0 active=24 refcnt=25 pending: linkwatch_event, flush_memcg_stats_dwork, 4*cfg80211_wiphy_work, 8*nsim_dev_trap_report_work, 2*cfg80211_wiphy_work, crng_reseed, idle_cull_fn, 4*macvlan_process_broadcast, 2*idle_cull_fn pwq 8: cpus=0-1 flags=0x4 nice=0 active=2 refcnt=3 in-flight: 1146:nsim_dev_trap_report_work for 176s ,12:toggle_allocation_gate for 176s workqueue events_power_efficient: flags=0x180 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=10 refcnt=11 pending: do_cache_clean, neigh_managed_work, neigh_periodic_work, 7*check_lifetime workqueue kvfree_rcu_reclaim: flags=0xa pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: kfree_rcu_monitor workqueue netns: flags=0x6000a pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=5 in-flight: 6727:cleanup_net for 186s inactive: cleanup_net workqueue mm_percpu_wq: flags=0x108 pwq 2: cpus=0 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=2 refcnt=3 pending: 2*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 gid-cache-wq: flags=0x20002 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=18 pending: netdevice_event_work_handler inactive: netdevice_event_work_handler, 2*update_gid_event_work_handler, 2*netdevice_event_work_handler, 2*update_gid_event_work_handler, netdevice_event_work_handler, 6*update_gid_event_work_handler workqueue mld: flags=0x40108 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=3 pending: mld_ifc_work inactive: mld_ifc_work workqueue ipv6_addrconf: flags=0x6000a pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=26 pending: addrconf_dad_work inactive: 16*addrconf_dad_work, 6*addrconf_verify_work workqueue krxrpcd: flags=0x2001a pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=4 pending: rxrpc_peer_keepalive_worker workqueue krdsd: flags=0x6000a pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=4 pending: rds_tcp_accept_worker workqueue bat_events: flags=0x6000a pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=28 pending: batadv_iv_send_outstanding_bat_ogm_packet inactive: 5*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, 9*batadv_iv_send_outstanding_bat_ogm_packet, batadv_tt_purge, 2*batadv_iv_send_outstanding_bat_ogm_packet, 5*batadv_tt_purge, batadv_dat_purge workqueue wg-crypt-wg0: flags=0x128 pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=0x128 pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg2: flags=0x128 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=2 refcnt=3 pending: wg_queued_expired_zero_key_material, wg_packet_handshake_send_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=2 refcnt=3 pending: wg_packet_handshake_send_worker, wg_queued_expired_zero_key_material workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=3 refcnt=4 pending: 2*wg_packet_handshake_send_worker, wg_queued_expired_zero_key_material workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg0: flags=0x128 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=0x128 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg2: flags=0x128 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg0: flags=0x128 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=0x128 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue hci1: flags=0x20012 pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=4 pending: hci_conn_timeout workqueue hci4: flags=0x20012 pwq 9: cpus=0-1 node=0 flags=0x4 nice=-20 active=1 refcnt=4 pending: hci_conn_timeout pool 6: cpus=1 node=0 flags=0x0 nice=0 hung=177s workers=7 idle: 6506 5943 5931 16810 796 24 pool 8: cpus=0-1 flags=0x4 nice=0 hung=177s workers=18 idle: 1170 47 1112 6731 61 14561 137 6726 1151 6736 14558 1156 36 14549 14559 Showing backtraces of busy workers in stalled worker pools: pool 6: task:kworker/1:3 state:D stack:26824 pid:17436 tgid:17436 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events nsim_fib_event_work Call Trace: context_switch kernel/sched/core.c:5387 [inline] __schedule+0x10e9/0x6820 kernel/sched/core.c:7188 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0xdd/0x390 kernel/sched/core.c:7282 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99 msleep+0x32/0x50 kernel/time/sleep_timeout.c:318 nsim_fib4_rt_add+0xbed/0x1650 drivers/net/netdevsim/fib.c:369 nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:432 [inline] nsim_fib4_event drivers/net/netdevsim/fib.c:464 [inline] nsim_fib_event drivers/net/netdevsim/fib.c:884 [inline] nsim_fib_event_work+0x1f2a/0x63b0 drivers/net/netdevsim/fib.c:1493 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302 process_scheduled_works kernel/workqueue.c:3385 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245