INFO: task kworker/0:1:10 blocked for more than 145 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:1 state:D stack:24064 pid:10 tgid:10 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events_power_efficient crda_timeout_work Call Trace: context_switch kernel/sched/core.c:5349 [inline] __schedule+0x1665/0x5590 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7044 [inline] schedule+0x164/0x360 kernel/sched/core.c:7059 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7116 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776 crda_timeout_work+0x16/0x80 net/wireless/reg.c:529 process_one_work+0x9a5/0x1760 kernel/workqueue.c:3286 process_scheduled_works kernel/workqueue.c:3377 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3458 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: 3 locks held by kworker/0:0/9: 3 locks held by kworker/u8:0/12: #0: ffff888032531148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x88b/0x1760 kernel/workqueue.c:3258 #1: ffffc90000117c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8b2/0x1760 kernel/workqueue.c:3259 #2: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0 net/ipv6/addrconf.c:4198 1 lock held by khungtaskd/30: #0: ffffffff8e75f2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8e75f2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8e75f2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 4 locks held by kworker/1:1/42: #0: ffff8880577d1548 ((wq_completion)wg-kex-wg0#6){+.+.}-{0:0}, at: process_one_work+0x88b/0x1760 kernel/workqueue.c:3258 #1: ffffc90000b27c40 ((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+0x8b2/0x1760 kernel/workqueue.c:3259 #2: ffff88807ccb1348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x1a1/0x9a0 drivers/net/wireguard/noise.c:598 #3: ffff888032c8dcf0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x58b/0x9a0 drivers/net/wireguard/noise.c:632 4 locks held by kworker/u8:6/145: #0: ffff88801c2b6948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x88b/0x1760 kernel/workqueue.c:3258 #1: ffffc90002f97c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8b2/0x1760 kernel/workqueue.c:3259 #2: ffffffff8fbc6fb0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800 net/core/net_namespace.c:675 #3: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: wg_netns_pre_exit+0x1c/0x200 drivers/net/wireguard/device.c:419 2 locks held by getty/5590: #0: ffff888036ef20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/5830: #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:634 [inline] #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0 drivers/net/tun.c:3436 1 lock held by syz-executor/5839: #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:634 [inline] #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0 drivers/net/tun.c:3436 1 lock held by syz-executor/5840: #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:634 [inline] #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0 drivers/net/tun.c:3436 2 locks held by kworker/0:4/5884: 5 locks held by kworker/0:5/5885: 2 locks held by kworker/1:4/5912: #0: ffff88801b06b148 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x88b/0x1760 kernel/workqueue.c:3258 #1: ffffc90004767c40 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x8b2/0x1760 kernel/workqueue.c:3259 3 locks held by kworker/0:6/5913: 3 locks held by kworker/1:5/5941: #0: ffff88801b06b148 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x88b/0x1760 kernel/workqueue.c:3258 #1: ffffc90004f17c40 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x8b2/0x1760 kernel/workqueue.c:3259 #2: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104 1 lock held by syz.1.2/5965: #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:634 [inline] #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0 drivers/net/tun.c:3436 3 locks held by kworker/1:6/5997: 2 locks held by kworker/0:10/6009: 2 locks held by syz-executor/6011: #0: ffffffff8fbc6fb0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:577 #1: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: cangw_pernet_exit_batch+0x20/0x90 net/can/gw.c:1294 2 locks held by syz-executor/6037: #0: ffffffff8fbc6fb0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:577 #1: ffffffff8e765578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline] #1: ffffffff8e765578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770 kernel/rcu/tree_exp.h:961 1 lock held by syz-executor/6041: #0: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: __tun_chr_ioctl+0x3bc/0x1e30 drivers/net/tun.c:3078 2 locks held by syz-executor/6043: #0: ffffffff8fbc6fb0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730 net/core/net_namespace.c:577 #1: ffffffff8fbd5e48 (rtnl_mutex){+.+.}-{4:4}, at: wg_netns_pre_exit+0x1c/0x200 drivers/net/wireguard/device.c:419 2 locks held by kworker/0:11/6047: 3 locks held by kworker/1:8/6056: #0: ffff88801b06b148 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x88b/0x1760 kernel/workqueue.c:3258 #1: ffffc90003017c40 ((fqdir_free_work).work){+.+.}-{0:0}, at: process_one_work+0x8b2/0x1760 kernel/workqueue.c:3259 #2: ffffffff8e765440 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:3828 2 locks held by dhcpcd/6059: #0: ffff88807274d048 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff88807274d048 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730 #1: ffffffff8e765578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline] #1: ffffffff8e765578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770 kernel/rcu/tree_exp.h:961 1 lock held by dhcpcd/6062: #0: ffff888072722648 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff888072722648 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730 1 lock held by dhcpcd/6063: #0: ffff888072726248 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff888072726248 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730 1 lock held by dhcpcd/6066: #0: ffff888072725c48 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] #0: ffff888072725c48 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730 ============================================= 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 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+0x1002/0x1060 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5885 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_power_efficient neigh_periodic_work RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 89 fb e8 23 00 00 00 48 8b 3d 74 3f 56 0c 48 89 de 5b e9 b3 e4 5d 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0d 78 5f 57 11 65 8b 15 99 5f 57 RSP: 0018:ffffc90000007d88 EFLAGS: 00000283 RAX: fffffbfff35c0740 RBX: 1ffff110087d4f61 RCX: ffff8880566a5b80 RDX: 0000000000000100 RSI: 000000000001eccc RDI: 0000000000000002 RBP: 00000000000043b0 R08: ffff88807ba0862b R09: 1ffff1100f7410c5 R10: dffffc0000000000 R11: ffffed100f7410c6 R12: ffffffff9ae256c0 R13: ffffffff9ae25780 R14: ffff888043ea7b00 R15: fffffbfff35c0728 FS: 0000000000000000(0000) GS:ffff888125441000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000341030 CR3: 000000000e54c000 CR4: 00000000003526f0 Call Trace: erase_dst_trace_buffer net/core/dst.c:89 [inline] dst_destroy+0x26e/0x570 net/core/dst.c:197 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 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:396 [inline] neigh_periodic_work+0xc28/0xe50 net/core/neighbour.c:1038 process_one_work+0x9a5/0x1760 kernel/workqueue.c:3286 process_scheduled_works kernel/workqueue.c:3377 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3458 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