INFO: task kworker/1:4:5744 blocked for more than 146 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:21104 pid:5744 tgid:5744 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7326 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821 class_wiphy_constructor include/net/cfg80211.h:6884 [inline] reg_leave_invalid_chans net/wireless/reg.c:2457 [inline] reg_check_chans_work+0x1a1/0x1110 net/wireless/reg.c:2472 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Showing all locks held in the system: 1 lock held by kthreadd/2: 1 lock held by kworker/R-rcu_g/4: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2737 3 locks held by kworker/0:0/9: 4 locks held by kworker/0:1/10: 3 locks held by kworker/u8:1/13: 1 lock held by kworker/R-mm_pe/14: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2737 3 locks held by kworker/1:0/24: 2 locks held by kworker/1:2/30: 1 lock held by khungtaskd/32: #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/u8:2/37: #0: ffff888031dae940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff888031dae940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #1: ffffc90000ad7c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffffc90000ad7c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #2: ffffffff9002d8c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff9002d8c0 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4769 1 lock held by kworker/R-quota/48: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2737 4 locks held by kworker/u8:3/49: #0: ffff88807fd1f140 ((wq_completion)wg-kex-wg0#9){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff88807fd1f140 ((wq_completion)wg-kex-wg0#9){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #1: ffffc90000b97c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffffc90000b97c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #2: ffff88807c7a5440 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12e/0x810 drivers/net/wireguard/noise.c:529 #3: ffff8880212fbea0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x13f/0x810 drivers/net/wireguard/noise.c:530 3 locks held by kworker/u8:4/61: 3 locks held by kworker/R-bat_e/3220: 3 locks held by kworker/u8:8/3275: 4 locks held by kworker/u8:9/3289: 3 locks held by kworker/u8:11/3338: 1 lock held by klogd/4977: 4 locks held by udevd/4988: 2 locks held by dhcpcd/5283: 3 locks held by kworker/0:3/5354: #0: ffff88801b02b140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff88801b02b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #1: ffffc90003107c40 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffffc90003107c40 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #2: ffffffff9002d8c0 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 2 locks held by getty/5378: #0: ffff888035a4f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/5609: 2 locks held by syz-executor/5629: 1 lock held by syz-executor/5632: 2 locks held by syz-executor/5636: 1 lock held by syz-executor/5641: #0: ffff888050ee20d8 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff888050ee20d8 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline] #0: ffff888050ee20d8 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:509 1 lock held by syz-executor/5653: #0: ffff8880310262e0 (&xt[i].mutex){+.+.}-{4:4}, at: xt_find_table_lock+0x55/0x400 net/netfilter/x_tables.c:1336 1 lock held by kworker/R-wg-cr/5710: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5711: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5716: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2737 1 lock held by kworker/R-wg-cr/5722: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5723: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5725: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5726: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2737 1 lock held by kworker/R-wg-cr/5727: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2737 1 lock held by kworker/R-wg-cr/5728: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5729: 1 lock held by kworker/R-wg-cr/5730: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5732: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5735: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2795 [inline] #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0 kernel/workqueue.c:3657 1 lock held by kworker/R-wg-cr/5736: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2737 4 locks held by kworker/1:4/5744: #0: ffff88801b029d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff88801b029d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #1: ffffc90004417c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffffc90004417c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #2: ffffffff9002d8c0 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xac/0x1110 net/wireless/reg.c:2469 #3: ffff8880523e07a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6884 [inline] #3: ffff8880523e07a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2457 [inline] #3: ffff8880523e07a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x1a1/0x1110 net/wireless/reg.c:2472 2 locks held by kworker/0:4/5751: 2 locks held by kworker/1:5/5752: 3 locks held by kworker/1:6/5765: 1 lock held by kworker/1:7/5766: #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2737 3 locks held by kworker/0:8/5890: 3 locks held by kworker/1:8/5916: #0: ffff88801b02b140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff88801b02b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #1: ffffc90004fa7c40 (key_gc_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffffc90004fa7c40 (key_gc_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #2: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] #2: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961 4 locks held by kworker/u8:0/15399: #0: ffff88807ce57140 ((wq_completion)wg-kex-wg2#5){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff88807ce57140 ((wq_completion)wg-kex-wg2#5){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #1: ffffc9001eca7c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffffc9001eca7c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #2: ffff888035fbd440 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12e/0x810 drivers/net/wireguard/noise.c:529 #3: ffff888022e9aad0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x13f/0x810 drivers/net/wireguard/noise.c:530 2 locks held by kworker/0:6/15483: 4 locks held by kworker/0:7/15551: 4 locks held by kworker/u8:5/16075: #0: ffff88807d5fd940 ((wq_completion)wg-kex-wg1#5){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff88807d5fd940 ((wq_completion)wg-kex-wg1#5){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #1: ffffc90020a57c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffffc90020a57c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #2: ffff888035fb9440 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12e/0x810 drivers/net/wireguard/noise.c:529 #3: ffff88807aa19700 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x13f/0x810 drivers/net/wireguard/noise.c:530 6 locks held by syz.2.4859/16941: 2 locks held by kworker/u8:6/16942: #0: ffff88801b179140 ((wq_completion)quota_events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: ffff88801b179140 ((wq_completion)quota_events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 #1: ffffc9001eabfc40 ((quota_release_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #1: ffffc9001eabfc40 ((quota_release_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405 3 locks held by kworker/0:9/16943: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122 nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xfd7/0x1030 kernel/hung_task.c:561 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3220 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: bat_events batadv_tt_purge RIP: 0010:debug_lockdep_rcu_enabled+0x29/0x40 kernel/rcu/update.c:321 Code: 90 f3 0f 1e fa 31 c0 83 3d c3 88 86 04 00 74 1d 83 3d 9a ba 86 04 00 74 14 65 48 8b 0d 58 15 9c 07 31 c0 83 b9 9c 0b 00 00 00 <0f> 94 c0 e9 4a 36 3f f5 cc cc cc cc cc cc cc cc cc cc cc cc cc cc RSP: 0018:ffffc90000007438 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880a74e38d0 RCX: ffff888032515d00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff88807d7d0000 RBP: ffffc900000075f0 R08: ffffc900000076af R09: ffffc90000007680 R10: dffffc0000000000 R11: ffffffff8aa130f0 R12: ffff8880a74e38c0 R13: dffffc0000000000 R14: ffff888031048100 R15: 1ffff92000000e98 FS: 0000000000000000(0000) GS:ffff888124f4e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd9393f0078 CR3: 000000005d62c000 CR4: 0000000000350ef0 Call Trace: br_port_get_rcu net/bridge/br_private.h:459 [inline] br_handle_frame_finish+0xe6/0x1990 net/bridge/br_input.c:79 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1 br_nf_pre_routing_finish_ipv6+0x90c/0xc40 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x382/0x6f0 net/bridge/br_netfilter_ipv6.c:183 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0x127f/0x1510 net/bridge/br_input.c:442 __netif_receive_skb_core+0x989/0x30b0 net/core/dev.c:6099 __netif_receive_skb_one_core net/core/dev.c:6210 [inline] __netif_receive_skb net/core/dev.c:6325 [inline] process_backlog+0x706/0x1860 net/core/dev.c:6676 __napi_poll+0xaa/0x330 net/core/dev.c:7735 napi_poll net/core/dev.c:7798 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:7955 handle_softirqs+0x225/0x840 kernel/softirq.c:622 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_tt_global_purge net/batman-adv/translation-table.c:2301 [inline] batadv_tt_purge+0x4ae/0xa10 net/batman-adv/translation-table.c:3566 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 rescuer_thread+0x7b6/0x10b0 kernel/workqueue.c:3629 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245