INFO: task kworker/1:1:29 blocked for more than 144 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:1 state:D stack:21088 pid:29 tgid:29 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: context_switch kernel/sched/core.c:5352 [inline] __schedule+0x165c/0x5560 kernel/sched/core.c:6964 __schedule_loop kernel/sched/core.c:7047 [inline] schedule+0x164/0x360 kernel/sched/core.c:7062 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7119 __mutex_lock_common kernel/locking/mutex.c:710 [inline] __mutex_lock+0x856/0x1420 kernel/locking/mutex.c:794 class_wiphy_constructor include/net/cfg80211.h:6443 [inline] reg_leave_invalid_chans net/wireless/reg.c:2439 [inline] reg_check_chans_work+0x15a/0xf50 net/wireless/reg.c:2454 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3288 process_scheduled_works kernel/workqueue.c:3379 [inline] worker_thread+0xba8/0x11e0 kernel/workqueue.c:3465 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 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: 2 locks held by kthreadd/2: 3 locks held by kworker/0:0/9: #0: ffff8880598df540 ((wq_completion)wg-kex-wg1#10){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260 #1: ffffc900000e7c40 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __ptr = (unsigned long) ((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker)))); (typeof((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261 #2: ffff888033994888 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_begin_session+0x36/0xbd0 drivers/net/wireguard/noise.c:822 3 locks held by kworker/0:1/10: 5 locks held by kworker/u8:0/12: 1 lock held by kworker/R-mm_pe/14: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2693 4 locks held by kworker/1:1/29: #0: ffff88813ff41d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260 #1: ffffc90000a57c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261 #2: ffffffff8fdf6540 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xa5/0xf50 net/wireless/reg.c:2451 #3: ffff888041fb0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6443 [inline] #3: ffff888041fb0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2439 [inline] #3: ffff888041fb0780 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x15a/0xf50 net/wireless/reg.c:2454 1 lock held by khungtaskd/31: #0: ffffffff8e95d7e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8e95d7e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8e95d7e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 4 locks held by kworker/u8:2/36: 3 locks held by kworker/u8:4/61: 4 locks held by kworker/u8:5/139: 3 locks held by kworker/u8:7/184: 1 lock held by kworker/0:2/809: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2693 3 locks held by kworker/1:2/810: 3 locks held by kworker/u8:9/1125: 3 locks held by kworker/u8:11/1351: 3 locks held by kworker/R-ipv6_/3204: #0: ffff888032c07940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260 #1: ffffc9000e0dfc00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261 #2: ffffffff8fdf6540 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8fdf6540 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4738 1 lock held by kworker/R-krxrp/3412: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2693 6 locks held by kworker/R-bat_e/3430: 1 lock held by klogd/5202: 2 locks held by udevd/5213: 2 locks held by dhcpcd/5507: 4 locks held by dhcpcd/5508: 2 locks held by crond/5587: 2 locks held by getty/5604: #0: ffff8880376e00a0 (&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+0x45c/0x13a0 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/5831: 4 locks held by kworker/1:3/5844: 4 locks held by kworker/1:4/5854: 3 locks held by kworker/0:3/5897: 2 locks held by kworker/0:4/5904: 2 locks held by kworker/0:5/5917: 2 locks held by kworker/1:6/5935: 4 locks held by kworker/0:6/5945: #0: ffff888074a96540 ((wq_completion)wg-kex-wg2#14){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260 #1: ffffc90004487c40 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __ptr = (unsigned long) ((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker)))); (typeof((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261 #2: ffff888034c6d380 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x1a1/0x9a0 drivers/net/wireguard/noise.c:598 #3: ffff888033990d18 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x58b/0x9a0 drivers/net/wireguard/noise.c:632 2 locks held by udevd/6036: 3 locks held by kworker/0:7/6216: 3 locks held by syz-executor/12094: 1 lock held by kworker/R-wg-cr/12099: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2751 [inline] #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xdc2/0x12f0 kernel/workqueue.c:3641 1 lock held by kworker/R-wg-cr/12101: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2751 [inline] #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xdc2/0x12f0 kernel/workqueue.c:3641 1 lock held by kworker/R-wg-cr/13789: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2751 [inline] #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xdc2/0x12f0 kernel/workqueue.c:3641 1 lock held by kworker/R-wg-cr/13790: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2693 4 locks held by kworker/u8:1/13814: #0: ffff88804c218940 ((wq_completion)wg-kex-wg1#9){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260 #1: ffffc90003697c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261 #2: ffff888067d65380 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12f/0x830 drivers/net/wireguard/noise.c:529 #3: ffff888033994888 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x140/0x830 drivers/net/wireguard/noise.c:530 1 lock held by kworker/R-wg-cr/14076: 2 locks held by syz-executor/17242: 1 lock held by kworker/R-wg-cr/17262: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2693 1 lock held by kworker/R-wg-cr/17264: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2751 [inline] #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xdc2/0x12f0 kernel/workqueue.c:3641 1 lock held by kworker/R-wg-cr/17266: 2 locks held by syz.7.3352/17703: 4 locks held by kworker/u8:3/17724: #0: ffff888078efb940 ((wq_completion)wg-kex-wg2#13){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260 #1: ffffc9000d937c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261 #2: ffff888034c6d380 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12f/0x830 drivers/net/wireguard/noise.c:529 #3: ffff888033990d18 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x140/0x830 drivers/net/wireguard/noise.c:530 3 locks held by kworker/u8:6/17725: 4 locks held by kworker/u8:8/17726: 4 locks held by kworker/u8:10/17727: 4 locks held by kworker/u8:12/17729: 4 locks held by kworker/u8:13/17730: #0: ffff88804c26b940 ((wq_completion)wg-kex-wg2#15){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260 #1: ffffc9000d817c40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261 #2: ffff888077c61380 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12f/0x830 drivers/net/wireguard/noise.c:529 #3: ffff888034cd2ad0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x140/0x830 drivers/net/wireguard/noise.c:530 1 lock held by kworker/u8:14/17731: #0: ffffffff8e7fbc60 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2693 3 locks held by kworker/1:0/17732: #0: ffff8880594a8140 ((wq_completion)wg-kex-wg0#16){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260 #1: ffffc9000366fc40 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __ptr = (unsigned long) ((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker)))); (typeof((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261 #2: ffff888034cd34b8 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_begin_session+0x36/0xbd0 drivers/net/wireguard/noise.c:822 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 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+0xfd3/0x1030 kernel/hung_task.c:561 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3430 Comm: kworker/R-bat_e Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: bat_events batadv_tt_purge RIP: 0010:filter_irq_stacks+0x32/0xa0 kernel/stacktrace.c:397 Code: 41 55 41 54 53 85 f6 74 70 49 89 fe 41 89 f4 31 db 49 bd 00 00 00 00 00 fc ff df 49 89 ff 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 ff e8 64 1f 7e 00 49 8b 04 de 48 3d 30 02 00 81 0f 93 RSP: 0018:ffffc90000a07bc8 EFLAGS: 00000246 RAX: 1ffff92000140f91 RBX: 0000000000000007 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 000000000000001c RDI: ffffc90000a07c50 RBP: ffffc90000a07e80 R08: 000000000000001e R09: ffffffff8e95d7e0 R10: ffffc90000a07b58 R11: ffffffff81b1dc30 R12: 000000000000001c R13: dffffc0000000000 R14: ffffc90000a07c50 R15: ffffc90000a07c88 FS: 0000000000000000(0000) GS:ffff8881250f3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd11da00000 CR3: 000000007f518000 CR4: 00000000003526f0 Call Trace: stack_depot_save_flags+0x33/0x810 lib/stackdepot.c:667 kasan_save_stack mm/kasan/common.c:58 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6242 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6369 kfree_skb_reason include/linux/skbuff.h:1322 [inline] kfree_skb include/linux/skbuff.h:1331 [inline] ip6_mc_input+0x8de/0xbd0 net/ipv6/ip6_input.c:633 ip_sabotage_in+0x1e1/0x270 net/bridge/br_netfilter_hooks.c:990 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:622 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316 __netif_receive_skb_one_core net/core/dev.c:6182 [inline] __netif_receive_skb net/core/dev.c:6295 [inline] netif_receive_skb_internal net/core/dev.c:6381 [inline] netif_receive_skb+0x278/0xbf0 net/core/dev.c:6440 NF_HOOK+0xa4/0x3a0 include/linux/netfilter.h:318 br_handle_frame_finish+0x14e2/0x1bb0 net/bridge/br_input.c:-1 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1 br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442 __netif_receive_skb_core+0x98f/0x3170 net/core/dev.c:6069 __netif_receive_skb_one_core net/core/dev.c:6180 [inline] __netif_receive_skb net/core/dev.c:6295 [inline] process_backlog+0x76d/0x1950 net/core/dev.c:6646 __napi_poll+0xae/0x340 net/core/dev.c:7710 napi_poll net/core/dev.c:7773 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7930 handle_softirqs+0x22a/0x840 kernel/softirq.c:626 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:2250 [inline] batadv_tt_purge+0x4d1/0x9e0 net/batman-adv/translation-table.c:3510 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3288 process_scheduled_works kernel/workqueue.c:3379 [inline] rescuer_thread+0x909/0x12f0 kernel/workqueue.c:3613 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245