BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 146s! BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 146s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: nsim_dev_hwstats_traffic_work, nsim_dev_hwstats_traffic_work pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=12/256 refcnt=13 in-flight: 4331:nsim_dev_hwstats_traffic_work pending: nsim_dev_hwstats_traffic_work, nsim_dev_hwstats_traffic_work, ovs_dp_masks_rebalance, ovs_dp_masks_rebalance, vmstat_shepherd, psi_avgs_work, psi_avgs_work, ovs_dp_masks_rebalance, psi_avgs_work, psi_avgs_work, 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_unbound: flags=0x2 pwq 4: cpus=0-1 flags=0x4 nice=0 active=10/512 refcnt=13 in-flight: 46:fsnotify_mark_destroy_workfn, 4436:fsnotify_connector_destroy_workfn, 38:nsim_dev_trap_report_work pending: nsim_dev_trap_report_work, nsim_dev_trap_report_work, toggle_allocation_gate, nsim_dev_trap_report_work, nsim_dev_trap_report_work, macvlan_process_broadcast, macvlan_process_broadcast 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 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 refcnt=5 pending: crda_timeout_work, reg_check_chans_work, neigh_managed_work, neigh_periodic_work workqueue rcu_gp: flags=0x8 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 refcnt=3 pending: srcu_invoke_callbacks, wait_rcu_exp_gp 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 writeback: flags=0x4a pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=4 pending: wb_workfn workqueue kblockd: flags=0x18 pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256 refcnt=2 pending: blk_mq_timeout_work 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=3 pending: rxrpc_peer_keepalive_worker inactive: rxrpc_peer_keepalive_worker workqueue bat_events: flags=0xe000a pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=22 in-flight: 4592:batadv_nc_worker inactive: batadv_nc_worker, batadv_nc_worker, batadv_nc_worker, batadv_nc_worker, batadv_tt_purge, batadv_tt_purge, batadv_tt_purge, batadv_tt_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, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge 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 hci2: 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 hci4: 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 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg0: flags=0x6 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=4 pending: wg_packet_handshake_send_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 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_decrypt_worker workqueue wg-crypt-wg2: flags=0x28 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 workqueue wg-crypt-wg0: flags=0x28 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 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 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 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg0: flags=0x6 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=4 pending: wg_packet_handshake_send_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=2/256 refcnt=3 pending: wg_packet_decrypt_worker, 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 workqueue phy3: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy4: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy5: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy6: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy7: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy8: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy9: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy10: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy11: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work workqueue phy12: flags=0xa0002 pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=4 pending: ieee80211_iface_work pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=147s workers=9 idle: 14 4375 4310 4395 4106 4309 7 128 pool 4: cpus=0-1 flags=0x4 nice=0 hung=147s workers=18 idle: 9 4758 4349 11 75 4383 4452 4759 4421 4308 4368 4589 4407 4420 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 15 at kernel/rcu/tree_stall.h:970 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:962 Modules linked in: CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:970 Code: ff ff ff 48 c7 c7 20 df c2 96 be 04 00 00 00 e8 6a 5b 65 00 48 89 df b8 01 00 00 00 87 05 7c 33 57 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 00 02 b3 8c 74 47 48 c7 c0 64 9f 1f 8e 48 c1 e8 03 RSP: 0018:ffffc90000147a18 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffffffff8cb30200 RCX: ffffffff816bab96 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cb30200 RBP: ffffc90000147c90 R08: 0000000000000004 R09: 0000000000000003 R10: fffffbfff2d85be4 R11: 1ffffffff2d85be4 R12: 0000000000002904 R13: dffffc0000000000 R14: 0000000000000a06 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f31dff8 CR3: 000000002cffa000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_core+0x5d9/0x16a0 kernel/rcu/tree.c:2552 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596 run_ksoftirqd+0x98/0xf0 kernel/softirq.c:963 smpboot_thread_fn+0x64a/0xa40 kernel/smpboot.c:164 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295