INFO: task kworker/u8:4:64 blocked for more than 143 seconds. Not tainted 6.14.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:4 state:D stack:20304 pid:64 tgid:64 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0x190e/0x4c90 kernel/sched/core.c:6764 __schedule_loop kernel/sched/core.c:6841 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6856 schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 __flush_workqueue+0x575/0x1280 kernel/workqueue.c:3998 drain_workqueue+0xc9/0x3a0 kernel/workqueue.c:4111 destroy_workqueue+0xba/0xc40 kernel/workqueue.c:5856 wg_destruct+0x198/0x2e0 drivers/net/wireguard/device.c:255 netdev_run_todo+0xd48/0xf30 net/core/dev.c:11159 default_device_exit_batch+0xa24/0xaa0 net/core/dev.c:12352 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x8af/0xd60 net/core/net_namespace.c:652 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Showing all locks held in the system: 1 lock held by kworker/R-mm_pe/13: #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2676 2 locks held by kworker/1:0/25: 1 lock held by khungtaskd/30: #0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746 2 locks held by kworker/1:1/46: 2 locks held by kworker/u8:3/47: 4 locks held by kworker/u8:4/64: #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317 #1: ffffc9000214fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000214fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317 #2: ffffffff8fcb45d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x17a/0xd60 net/core/net_namespace.c:606 #3: ffff88807d9014e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_destruct+0x110/0x2e0 drivers/net/wireguard/device.c:249 3 locks held by kworker/u8:6/1144: #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline] #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317 #1: ffffc9000453fc60 ((work_completion)(&pool->idle_cull_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline] #1: ffffc9000453fc60 ((work_completion)(&pool->idle_cull_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317 #2: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: idle_cull_fn+0xd5/0x760 kernel/workqueue.c:2958 2 locks held by getty/5580: #0: ffff8880355ca0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by kworker/R-wg-cr/5868: #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2676 1 lock held by kworker/R-wg-cr/5869: #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline] #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xaf5/0x10a0 kernel/workqueue.c:3533 2 locks held by kworker/R-wg-cr/5870: 1 lock held by kworker/R-wg-cr/5872: #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline] #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xaf5/0x10a0 kernel/workqueue.c:3533 2 locks held by kworker/R-wg-cr/5873: #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline] #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xaf5/0x10a0 kernel/workqueue.c:3533 #1: ffffffff8e7f6280 (sched_map-wait-type-override){+.+.}-{3:3}, at: sched_submit_work kernel/sched/core.c:6797 [inline] #1: ffffffff8e7f6280 (sched_map-wait-type-override){+.+.}-{3:3}, at: schedule+0x90/0x320 kernel/sched/core.c:6855 2 locks held by kworker/R-wg-cr/5874: 2 locks held by kworker/R-wg-cr/5875: 2 locks held by kworker/R-wg-cr/5881: 4 locks held by kworker/1:3/5890: 2 locks held by kworker/1:5/5895: 2 locks held by kworker/1:6/5896: 2 locks held by kworker/1:7/5909: 2 locks held by kworker/R-wg-cr/15204: 2 locks held by kworker/R-wg-cr/15205: 2 locks held by kworker/R-wg-cr/16820: 2 locks held by kworker/R-wg-cr/16821: 2 locks held by kworker/R-wg-cr/17099: 2 locks held by kworker/R-wg-cr/17100: 1 lock held by kworker/R-wg-cr/17102: #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline] #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xaf5/0x10a0 kernel/workqueue.c:3533 2 locks held by dhcpcd/19450: #0: ffff88806406e258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1624 [inline] #0: ffff88806406e258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcb0 net/packet/af_packet.c:3253 #1: ffffffff8e93dcb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:302 [inline] #1: ffffffff8e93dcb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:996 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline] watchdog+0x1058/0x10a0 kernel/hung_task.c:399 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 17100 Comm: kworker/R-wg-cr Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: wg-crypt-wg1 wg_packet_encrypt_worker RIP: 0010:unwind_next_frame+0x0/0x22d0 arch/x86/kernel/unwind_orc.c:469 Code: a4 ff 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 91 4c 89 f7 e8 63 45 ba 00 eb 87 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 81 ec 98 00 00 00 49 RSP: 0018:ffffc90000a181b8 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffffc90000a181c0 RCX: ffffffff917c1000 RDX: dffffc0000000000 RSI: ffffffff81ab0dc8 RDI: ffffc90000a181c0 RBP: ffffc90000a18250 R08: 0000000000000000 R09: ffffc90000a182b0 R10: dffffc0000000000 R11: ffffffff81ab0e90 R12: ffff888025a29e00 R13: ffffffff81ab0e90 R14: ffffc90000a182a0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f03f8a8eea7 CR3: 00000000295f8000 CR4: 0000000000350ef0 Call Trace: arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4325 kmalloc_noprof include/linux/slab.h:901 [inline] dummy_urb_enqueue+0x7d/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1273 usb_hcd_submit_urb+0x36e/0x1e80 drivers/usb/core/hcd.c:1533 ath9k_hif_usb_reg_in_cb+0x4ce/0x6e0 drivers/net/wireless/ath/ath9k/hif_usb.c:790 __usb_hcd_giveback_urb+0x42e/0x6e0 drivers/usb/core/hcd.c:1650 dummy_timer+0x856/0x4620 drivers/usb/gadget/udc/dummy_hcd.c:1994 __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x59d/0xd30 kernel/time/hrtimer.c:1865 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1882 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:skb_headlen include/linux/skbuff.h:2482 [inline] RIP: 0010:__skb_flow_dissect+0x2ff/0x7d00 net/core/flow_dissector.c:1072 Code: f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 b0 75 00 00 44 0f b7 bb b8 00 00 00 48 8d 7b 70 48 89 f8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 a9 75 00 00 44 8b 73 70 48 83 c3 74 48 89 d8 48 c1 e8 RSP: 0018:ffffc90002ec6d80 EFLAGS: 00000212 RAX: 0000000000000000 RBX: ffff88802b522640 RCX: ffffc90002ec7101 RDX: ffff888025a29e00 RSI: 0000000000000000 RDI: ffff88802b5226b0 RBP: ffffc90002ec73b8 R08: ffffffff89bb223d R09: 0000000000000000 R10: dffffc0000000000 R11: fffff520005d8e96 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88802b522640 R15: 0000000000000000 __skb_get_hash_net+0xca/0xcb0 net/core/flow_dissector.c:1888 skb_get_hash include/linux/skbuff.h:1616 [inline] encrypt_packet drivers/net/wireguard/send.c:173 [inline] wg_packet_encrypt_worker+0x3c5/0x16b0 drivers/net/wireguard/send.c:297 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317 rescuer_thread+0x63f/0x10a0 kernel/workqueue.c:3494 kthread+0x7ab/0x920 kernel/kthread.c:464 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244