INFO: task kworker/1:2:795 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:2 state:D stack:22536 pid:795 tgid:795 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1539/0x5110 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776 class_wiphy_constructor include/net/cfg80211.h:6441 [inline] reg_leave_invalid_chans net/wireless/reg.c:2452 [inline] reg_check_chans_work+0x171/0xfe0 net/wireless/reg.c:2467 process_one_work+0x949/0x1650 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] worker_thread+0xb46/0x1140 kernel/workqueue.c:3443 kthread+0x388/0x470 kernel/kthread.c:467 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: 1 lock held by kworker/R-rcu_g/4: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2691 2 locks held by kworker/0:0/9: 3 locks held by kworker/0:1/10: 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/13: 1 lock held by kworker/R-mm_pe/14: 3 locks held by kworker/1:0/24: 1 lock held by khungtaskd/30: #0: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 1 lock held by kworker/R-write/32: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2691 5 locks held by kworker/u8:2/35: 4 locks held by kworker/1:1/42: 3 locks held by kworker/u8:3/49: 4 locks held by kworker/u8:4/77: #0: ffff888060bd2148 ((wq_completion)wg-kex-wg2#3){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254 #1: ffffc9000210fc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255 #2: ffff888076cb5348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12f/0x830 drivers/net/wireguard/noise.c:529 #3: ffff88807a0bb4c0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x140/0x830 drivers/net/wireguard/noise.c:530 3 locks held by kworker/u8:5/155: 4 locks held by kworker/1:2/795: #0: ffff88813ff46148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254 #1: ffffc90003297c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255 #2: ffffffff8fde8388 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xa5/0xfe0 net/wireless/reg.c:2464 #3: ffff88807c3f0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6441 [inline] #3: ffff88807c3f0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2452 [inline] #3: ffff88807c3f0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x171/0xfe0 net/wireless/reg.c:2467 3 locks held by kworker/0:2/944: 3 locks held by kworker/0:3/1207: 4 locks held by kworker/u8:6/1332: 1 lock held by kworker/R-bat_e/3407: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2691 3 locks held by kworker/u8:7/3492: #0: ffff888032561148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254 #1: ffffc9000bf1fc40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255 #2: ffffffff8fde8388 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8fde8388 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4739 6 locks held by kworker/u8:8/3527: 4 locks held by kworker/u8:9/3544: #0: ffff88806088b148 ((wq_completion)wg-kex-wg2#7){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254 #1: ffffc9000bd2fc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255 #2: ffff888032ea9348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12f/0x830 drivers/net/wireguard/noise.c:529 #3: ffff88805f8b3ea8 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x140/0x830 drivers/net/wireguard/noise.c:530 4 locks held by kworker/u8:10/3562: 2 locks held by klogd/5182: 1 lock held by udevd/5193: 2 locks held by dhcpcd/5487: 5 locks held by dhcpcd/5488: 2 locks held by getty/5584: #0: ffff8880376500a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900036be2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211 4 locks held by kworker/1:3/5822: 2 locks held by syz-executor/5830: 1 lock held by kworker/R-wg-cr/5852: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline] #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614 1 lock held by kworker/R-wg-cr/5853: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline] #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614 1 lock held by kworker/R-wg-cr/5854: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline] #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614 1 lock held by kworker/R-wg-cr/5855: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline] #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614 1 lock held by kworker/R-wg-cr/5856: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline] #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614 1 lock held by kworker/R-wg-cr/5857: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline] #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614 1 lock held by kworker/R-wg-cr/5858: 1 lock held by kworker/R-wg-cr/5861: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline] #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614 1 lock held by kworker/R-wg-cr/5862: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline] #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614 1 lock held by kworker/1:4/5877: #0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2691 3 locks held by kworker/0:4/5890: 4 locks held by kworker/1:5/5892: 4 locks held by kworker/0:5/5913: 3 locks held by kworker/1:6/5922: 2 locks held by kworker/0:6/5924: 2 locks held by kworker/1:7/5946: 1 lock held by syz.3.412/7137: 4 locks held by kworker/u8:11/7143: 4 locks held by kworker/0:7/7144: #0: ffff88807a75f148 ((wq_completion)wg-kex-wg2#2){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254 #1: ffffc9000424fc40 ((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+0x87c/0x1650 kernel/workqueue.c:3255 #2: ffff888078fe9348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x1a1/0x9a0 drivers/net/wireguard/noise.c:598 #3: ffff88807a0bdc60 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x58b/0x9a0 drivers/net/wireguard/noise.c:632 4 locks held by kworker/0:8/7145: 4 locks held by kworker/u8:12/7146: #0: ffff88806088c148 ((wq_completion)wg-kex-wg1#3){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254 #1: ffffc90003e9fc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255 #2: ffff888076e19348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12f/0x830 drivers/net/wireguard/noise.c:529 #3: ffff88807a0bc890 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x140/0x830 drivers/net/wireguard/noise.c:530 1 lock held by syz-executor/7147: 2 locks held by syz-executor/7148: 3 locks held by syz-executor/7151: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 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:161 [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:347 [inline] watchdog+0x103d/0x1090 kernel/hung_task.c:516 kthread+0x388/0x470 kernel/kthread.c:467 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3527 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:__lock_release kernel/locking/lockdep.c:5571 [inline] RIP: 0010:lock_release+0x179/0x3d0 kernel/locking/lockdep.c:5889 Code: 01 c8 05 00 00 e0 ff 81 c1 00 00 e0 ff 89 45 20 85 c9 0f 85 e6 00 00 00 45 89 af 10 0b 00 00 48 8b 45 00 49 89 87 08 0b 00 00 <41> 39 d5 0f 84 cb 00 00 00 41 ff c5 48 8d 4c 24 24 4c 89 ff 48 8b RSP: 0018:ffffc90000006970 EFLAGS: 00000083 RAX: 39529a686290c103 RBX: 0000000000000202 RCX: 0000000080000102 RDX: 0000000000000007 RSI: ffffffff8e960320 RDI: ffff8880337c8c30 RBP: ffff8880337c8c30 R08: ffffc90000006b07 R09: 0000000000000000 R10: ffffc90000006af8 R11: fffff52000000d61 R12: 0000000000000007 R13: 0000000000000007 R14: ffffffff8e960320 R15: ffff8880337c8000 FS: 0000000000000000(0000) GS:ffff888125018000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f36fc1e0ad8 CR3: 000000006d9cc000 CR4: 00000000003526f0 Call Trace: rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/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:2667 [inline] slab_free mm/slub.c:6079 [inline] kmem_cache_free+0x187/0x630 mm/slub.c:6205 skb_ext_reset include/linux/skbuff.h:5087 [inline] skb_release_head_state+0x270/0x360 net/core/skbuff.c:1194 skb_release_all net/core/skbuff.c:1200 [inline] __kfree_skb+0x24/0x210 net/core/skbuff.c:1216 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:593 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:623 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:6152 [inline] __netif_receive_skb net/core/dev.c:6265 [inline] netif_receive_skb_internal net/core/dev.c:6351 [inline] netif_receive_skb+0x278/0xc50 net/core/dev.c:6410 NF_HOOK+0xa4/0x3a0 include/linux/netfilter.h:319 br_handle_frame_finish+0x14b2/0x1b40 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/0x31a0 net/core/dev.c:6039 __netif_receive_skb_one_core net/core/dev.c:6150 [inline] __netif_receive_skb net/core/dev.c:6265 [inline] process_backlog+0x76d/0x1950 net/core/dev.c:6617 __napi_poll+0xae/0x340 net/core/dev.c:7681 napi_poll net/core/dev.c:7744 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7896 handle_softirqs+0x22a/0x870 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:395 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:891 [inline] nsim_dev_trap_report_work+0x7c7/0xb80 drivers/net/netdevsim/dev.c:922 process_one_work+0x949/0x1650 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] worker_thread+0xb46/0x1140 kernel/workqueue.c:3443 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 01 c8 add %ecx,%eax 2: 05 00 00 e0 ff add $0xffe00000,%eax 7: 81 c1 00 00 e0 ff add $0xffe00000,%ecx d: 89 45 20 mov %eax,0x20(%rbp) 10: 85 c9 test %ecx,%ecx 12: 0f 85 e6 00 00 00 jne 0xfe 18: 45 89 af 10 0b 00 00 mov %r13d,0xb10(%r15) 1f: 48 8b 45 00 mov 0x0(%rbp),%rax 23: 49 89 87 08 0b 00 00 mov %rax,0xb08(%r15) * 2a: 41 39 d5 cmp %edx,%r13d <-- trapping instruction 2d: 0f 84 cb 00 00 00 je 0xfe 33: 41 ff c5 inc %r13d 36: 48 8d 4c 24 24 lea 0x24(%rsp),%rcx 3b: 4c 89 ff mov %r15,%rdi 3e: 48 rex.W 3f: 8b .byte 0x8b