BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 54s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x100
  pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=13 refcnt=14
    pending: 3*nsim_dev_hwstats_traffic_work, 4*psi_avgs_work, vmstat_shepherd, 3*ovs_dp_masks_rebalance, bpf_prog_free_deferred, free_obj_work
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=15 refcnt=16
    in-flight: 866:nsim_fib_event_work for 51s ,24:reg_todo for 32s
    pending: delayed_vfree_work, 2*ovs_dp_masks_rebalance, nsim_fib_event_work, 2*nsim_dev_hwstats_traffic_work, psi_avgs_work, debugfs_reap_work, destroy_super_work, psi_avgs_work, 2*ovs_dp_masks_rebalance, drm_fb_helper_damage_work
workqueue events_unbound: flags=0x2
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=24 refcnt=25
    in-flight: 12:cfg80211_wiphy_work for 54s cfg80211_wiphy_work ,58:cfg80211_wiphy_work for 51s cfg80211_wiphy_work ,3067:cfg80211_wiphy_work for 49s cfg80211_wiphy_work ,40:cfg80211_wiphy_work for 52s cfg80211_wiphy_work ,3004:cfg80211_wiphy_work for 55s cfg80211_wiphy_work ,158:cfg80211_wiphy_work for 53s cfg80211_wiphy_work
    pending: cfg80211_wiphy_work, 9*macvlan_process_broadcast, crng_reseed, macvlan_process_broadcast
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=16 refcnt=17
    in-flight: 49:cfg80211_wiphy_work for 48s ,3203:cfg80211_wiphy_work for 53s cfg80211_wiphy_work ,3240:cfg80211_wiphy_work for 53s cfg80211_wiphy_work ,3134:cfg80211_wiphy_work for 7s
    pending: cfg80211_wiphy_work, nsim_dev_trap_report_work, macvlan_process_broadcast, 2*nsim_dev_trap_report_work, cfg80211_wiphy_work, 2*nsim_dev_trap_report_work, toggle_allocation_gate, flush_memcg_stats_dwork
workqueue events_power_efficient: flags=0x82
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=10 refcnt=11
    in-flight: 1186:neigh_periodic_work for 54s
    pending: gc_worker, neigh_managed_work, do_cache_clean, wg_ratelimiter_gc_entries, hash_netportnet4_gc, crda_timeout_work, fb_flashcursor, hash_netportnet4_gc, neigh_managed_work
workqueue events_dfl_long: flags=0x2
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=7 refcnt=8
    pending: 7*defense_work_handler
workqueue netns: flags=0x6000a
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=5
    in-flight: 13:cleanup_net for 60s
    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
  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=0x6 nice=0 active=2 refcnt=5 MAYDAY
    in-flight: 33(RESCUER):wb_workfn for 50s
    pending: wb_workfn
workqueue mld: flags=0x40108
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=31
    in-flight: 4822:mld_dad_work for 12s
    inactive: 29*mld_dad_work
workqueue bat_events: flags=0x6000a
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=53 MAYDAY
    in-flight: 2854(RESCUER):batadv_tt_purge for 8s
    pending: mayday_cursor_func
    inactive: 2*batadv_tt_purge, batadv_mcast_mla_update, batadv_tt_purge, 5*batadv_mcast_mla_update, batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, 4*batadv_iv_send_outstanding_bat_ogm_packet, batadv_dat_purge, batadv_bla_periodic_work, 7*batadv_iv_send_outstanding_bat_ogm_packet, 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, 3*batadv_iv_send_outstanding_bat_ogm_packet, 4*batadv_purge_orig, 3*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, 2*batadv_tt_purge
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-kex-wg2: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_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-kex-wg1: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_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-kex-wg0: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_worker
workqueue wg-kex-wg1: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_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-wg1: flags=0x128
  pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
    pending: wg_packet_encrypt_worker, wg_packet_tx_worker
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2
    pending: wg_packet_tx_worker
workqueue wg-kex-wg2: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_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-kex-wg2: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_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-kex-wg1: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_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 krds_cp_wq#3/0: flags=0x20002
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=4
    in-flight: 2942:rds_connect_worker for 6s
workqueue wg-kex-wg0: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 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=2 refcnt=3
    pending: wg_packet_encrypt_worker, wg_packet_tx_worker
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2
    pending: wg_packet_tx_worker
workqueue wg-kex-wg1: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg1: flags=0x128
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=2 refcnt=3
    pending: wg_packet_encrypt_worker, wg_packet_decrypt_worker
workqueue wg-kex-wg2: flags=0x124
  pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_receive_worker
workqueue wg-kex-wg2: flags=0x6
  pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
    pending: wg_packet_handshake_send_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
pool 6: cpus=1 node=0 flags=0x0 nice=0 hung=12s workers=7 idle: 26 4328 4856 4817
pool 8: cpus=0-1 flags=0x6 nice=0 hung=6s workers=14 manager: 5789
Showing backtraces of busy workers in stalled worker pools:
pool 2: no worker in running state, cpu=0 is busy (nr_workers=8 nr_idle=8)
The pool might have trouble waking an idle worker.
Backtrace of last woken worker:
task:kworker/0:2     state:R  running task     stack:0     pid:1154  tgid:1154  ppid:2      task_flags:0x4208060 flags:0x00000010
Workqueue:  0x0 (events)
Call trace:
 __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T)
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x135c/0x2b00 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x13c/0x20c kernel/sched/core.c:7376
 worker_thread+0x924/0xbd0 kernel/workqueue.c:3575
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2854 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026
Workqueue: bat_events batadv_tt_purge
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x270/0x2b8 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x1c0/0x430 lib/nmi_backtrace.c:66
 arch_trigger_cpumask_backtrace+0x30/0x40 arch/arm64/kernel/smp.c:972
 cpumask_backtrace+0x28/0x38 lib/nmi_backtrace.c:136
 trigger_single_cpu_backtrace include/linux/nmi.h:182 [inline]
 show_cpu_pool_busy_workers kernel/workqueue.c:7885 [inline]
 show_cpu_pools_busy_workers+0x640/0x830 kernel/workqueue.c:7899
 wq_watchdog_timer_fn+0x648/0x740 kernel/workqueue.c:8015
 call_timer_fn+0x198/0x7f4 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2374 [inline]
 __run_timer_base+0x530/0x744 kernel/time/timer.c:2386
 run_timer_base+0x84/0x1b8 kernel/time/timer.c:2395
 run_timer_softirq+0x28/0x48 kernel/time/timer.c:2406
 handle_softirqs+0x324/0xcbc kernel/softirq.c:645
 __do_softirq+0x14/0x20 kernel/softirq.c:679
 ____do_softirq+0x10/0x1c arch/arm64/kernel/irq.c:78
 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:901
 do_softirq_own_stack+0x1c/0x28 arch/arm64/kernel/irq.c:83
 do_softirq+0x90/0xf8 kernel/softirq.c:546
 __local_bh_enable_ip+0x190/0x234 kernel/softirq.c:473
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:237 [inline]
 _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:245
 spin_unlock_bh include/linux/spinlock.h:407 [inline]
 batadv_tt_local_purge+0x274/0x2f0 net/batman-adv/translation-table.c:1402
 batadv_tt_purge+0x44/0x7b4 net/batman-adv/translation-table.c:3753
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479
 rescuer_thread+0x68c/0xd90 kernel/workqueue.c:3703
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854