INFO: task kworker/1:1:43 blocked for more than 145 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:1 state:D stack:21464 pid:43 tgid:43 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events console_callback Call Trace: context_switch kernel/sched/core.c:5264 [inline] __schedule+0x1848/0x4ec0 kernel/sched/core.c:6872 __schedule_loop kernel/sched/core.c:6954 [inline] schedule+0x165/0x360 kernel/sched/core.c:6969 schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75 ___down_common kernel/locking/semaphore.c:268 [inline] __down_common+0x319/0x6a0 kernel/locking/semaphore.c:293 down+0x80/0xd0 kernel/locking/semaphore.c:100 console_lock+0x58/0x90 kernel/printk/printk.c:2822 class_console_lock_constructor include/linux/console.h:724 [inline] console_callback+0x69/0x440 drivers/tty/vt/vt.c:3256 process_one_work+0x94a/0x15d0 kernel/workqueue.c:3267 process_scheduled_works kernel/workqueue.c:3350 [inline] worker_thread+0x9b0/0xee0 kernel/workqueue.c:3431 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 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-kvfre/6: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2678 3 locks held by kworker/0:0/9: #0: ffff88813fe16948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x841/0x15d0 kernel/workqueue.c:3242 #1: ffffc900000e7b80 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x868/0x15d0 kernel/workqueue.c:3243 #2: ffffffff8f2d7e08 (rtnl_mutex){+.+.}-{4:4}, at: crda_timeout_work+0x16/0x80 net/wireless/reg.c:541 3 locks held by kworker/0:1/10: #0: ffff88813fe16948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x841/0x15d0 kernel/workqueue.c:3242 #1: ffffc900000f7b80 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x868/0x15d0 kernel/workqueue.c:3243 #2: ffffffff8f2d7e08 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xa1/0xf70 net/wireless/reg.c:2453 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: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 4 locks held by kworker/1:0/24: 1 lock held by khungtaskd/31: #0: ffffffff8df3b720 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df3b720 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8df3b720 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/u8:2/36: 2 locks held by kworker/1:1/43: #0: ffff88813fe15948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x841/0x15d0 kernel/workqueue.c:3242 #1: ffffc90000b37b80 (console_work){+.+.}-{0:0}, at: process_one_work+0x868/0x15d0 kernel/workqueue.c:3243 3 locks held by kworker/u8:3/50: 3 locks held by kworker/u8:4/62: 4 locks held by kworker/1:2/793: 3 locks held by kworker/u8:5/1150: 2 locks held by kworker/0:2/1207: 3 locks held by kworker/R-ipv6_/3178: #0: ffff88814ca86148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x841/0x15d0 kernel/workqueue.c:3242 #1: ffffc9000b407b60 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15d0 kernel/workqueue.c:3243 #2: ffffffff8f2d7e08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8f2d7e08 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4734 3 locks held by kworker/u8:6/4433: 5 locks held by kworker/u9:1/5143: #0: ffff8880270cd948 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work+0x841/0x15d0 kernel/workqueue.c:3242 #1: ffffc9000e1ffb80 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15d0 kernel/workqueue.c:3243 #2: ffff88807c944dd0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400 net/bluetooth/hci_sync.c:331 #3: ffff88807c9440c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x242/0xe30 net/bluetooth/hci_sync.c:5691 #4: ffffffff8f441c68 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2118 [inline] #4: ffffffff8f441c68 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340 net/bluetooth/hci_conn.c:1331 2 locks held by klogd/5182: 3 locks held by udevd/5193: 1 lock held by dhcpcd/5487: 4 locks held by dhcpcd/5488: 2 locks held by crond/5566: 2 locks held by getty/5583: #0: ffff88814d8b70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000362b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/5810: 4 locks held by kworker/0:3/5815: #0: ffff88813fe15948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x841/0x15d0 kernel/workqueue.c:3242 #1: ffffc90003f8fb80 (reg_work){+.+.}-{0:0}, at: process_one_work+0x868/0x15d0 kernel/workqueue.c:3243 #2: ffffffff8f2d7e08 (rtnl_mutex){+.+.}-{4:4}, at: reg_todo+0x1c/0x8d0 net/wireless/reg.c:3189 #3: ffff888057170788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6363 [inline] #3: ffff888057170788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_process_self_managed_hints+0xaf/0x1c0 net/wireless/reg.c:3179 2 locks held by syz-executor/5821: 5 locks held by syz-executor/5824: 3 locks held by kworker/0:4/5829: 4 locks held by udevd/5833: 5 locks held by kworker/u9:3/5835: 5 locks held by kworker/u9:6/5839: #0: ffff8880275ed148 ((wq_completion)hci4){+.+.}-{0:0}, at: process_one_work+0x841/0x15d0 kernel/workqueue.c:3242 #1: ffffc9000412fb80 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15d0 kernel/workqueue.c:3243 #2: ffff88807ab5cdd0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400 net/bluetooth/hci_sync.c:331 #3: ffff88807ab5c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x242/0xe30 net/bluetooth/hci_sync.c:5691 #4: ffffffff8df411f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] #4: ffffffff8df411f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:957 1 lock held by kworker/R-wg-cr/5860: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 1 lock held by kworker/R-wg-cr/5861: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 1 lock held by kworker/R-wg-cr/5862: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 2 locks held by kworker/R-wg-cr/5863: 1 lock held by kworker/R-wg-cr/5864: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 1 lock held by kworker/R-wg-cr/5865: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2678 1 lock held by kworker/R-wg-cr/5867: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 1 lock held by kworker/R-wg-cr/5869: 1 lock held by kworker/R-wg-cr/5872: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 1 lock held by kworker/R-wg-cr/5873: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 1 lock held by kworker/R-wg-cr/5875: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2736 [inline] #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x767/0xf00 kernel/workqueue.c:3560 1 lock held by kworker/R-wg-cr/5876: 1 lock held by kworker/R-wg-cr/5877: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2678 1 lock held by kworker/R-wg-cr/5878: 7 locks held by kworker/1:3/5886: 3 locks held by kworker/0:5/5912: 1 lock held by kworker/0:6/5921: #0: ffffffff8dde2368 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2678 3 locks held by kworker/u8:7/5940: 2 locks held by kworker/0:7/5941: 3 locks held by kworker/1:5/5945: 2 locks held by kworker/1:6/5961: 1 lock held by syz.0.109/6208: #0: ffff88805ff340e0 (&type->s_umount_key#32){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff88805ff340e0 (&type->s_umount_key#32){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff88805ff340e0 (&type->s_umount_key#32){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506 1 lock held by kmmpd-loop0/6215: #0: ffff88805ff34420 (sb_writers#4){.+.+}-{0:0}, at: kmmpd+0x3b2/0xa50 fs/ext4/mmp.c:174 6 locks held by syz.4.116/6228: 3 locks held by kworker/u8:8/6231: 3 locks held by kworker/u8:9/6232: 4 locks held by kworker/u8:10/6235: 2 locks held by kworker/u8:11/6236: 4 locks held by kworker/u8:12/6238: 2 locks held by kworker/u8:13/6240: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:336 [inline] watchdog+0xfa9/0xff0 kernel/hung_task.c:499 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 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: 5886 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: wg-kex-wg2 wg_packet_handshake_receive_worker RIP: 0010:__preempt_count_add kernel/rcu/tree.c:747 [inline] RIP: 0010:rcu_is_watching+0x8/0xb0 kernel/rcu/tree.c:750 Code: 3e 22 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 <53> 65 ff 05 f0 76 ce 10 e8 9b e4 b4 09 89 c3 83 f8 08 73 65 49 bf RSP: 0018:ffffc90000a082d0 EFLAGS: 00000057 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81c945d8 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8f7da970 RBP: ffffc90000a08390 R08: ffffffff8f7da977 R09: 1ffffffff1efb52e R10: dffffc0000000000 R11: fffffbfff1efb52f R12: ffffffff8a21ca8b R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000141060 FS: 0000000000000000(0000) GS:ffff888125fc2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff04ecfc58 CR3: 000000006955e000 CR4: 00000000003526f0 Call Trace: trace_irq_disable+0x37/0x110 include/trace/events/preemptirq.h:36 __local_bh_enable_ip+0xce/0x1c0 kernel/softirq.c:432 local_bh_enable include/linux/bottom_half.h:33 [inline] ip6t_do_table+0x1376/0x1560 net/ipv6/netfilter/ip6_tables.c:375 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 include/linux/netfilter.h:316 [inline] br_nf_pre_routing_ipv6+0x586/0x6b0 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+0x96e/0x14f0 net/bridge/br_input.c:442 __netif_receive_skb_core+0x96f/0x3060 net/core/dev.c:6017 __netif_receive_skb_one_core net/core/dev.c:6128 [inline] __netif_receive_skb+0x72/0x380 net/core/dev.c:6243 process_backlog+0x622/0x1530 net/core/dev.c:6595 __napi_poll+0xae/0x320 net/core/dev.c:7658 napi_poll net/core/dev.c:7721 [inline] net_rx_action+0x672/0xe50 net/core/dev.c:7873 handle_softirqs+0x286/0x870 kernel/softirq.c:626 do_softirq+0xec/0x180 kernel/softirq.c:523 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] fpregs_unlock arch/x86/include/asm/fpu/api.h:77 [inline] kernel_fpu_end+0xd2/0x120 arch/x86/kernel/fpu/core.c:479 blake2s_compress+0xe9/0x1b80 lib/crypto/x86/blake2s.h:42 blake2s_final+0x116/0x270 lib/crypto/blake2s.c:148 hmac+0x1c6/0x330 drivers/net/wireguard/noise.c:325 kdf+0x105/0x270 drivers/net/wireguard/noise.c:367 mix_dh drivers/net/wireguard/noise.c:413 [inline] wg_noise_handshake_consume_initiation+0x220/0x900 drivers/net/wireguard/noise.c:608 wg_receive_handshake_packet drivers/net/wireguard/receive.c:144 [inline] wg_packet_handshake_receive_worker+0x5f4/0xfd0 drivers/net/wireguard/receive.c:213 process_one_work+0x94a/0x15d0 kernel/workqueue.c:3267 process_scheduled_works kernel/workqueue.c:3350 [inline] worker_thread+0x9b0/0xee0 kernel/workqueue.c:3431 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245