INFO: task kworker/1:14:7318 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:14 state:D stack:30592 pid:7318 tgid:7318 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14bc/0x5000 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x165/0x360 kernel/sched/core.c:6960 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017 kthread+0x2bc/0x8a0 kernel/kthread.c:451 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Showing all locks held in the system: 2 locks held by kworker/1:0/24: 4 locks held by kworker/1:1/30: 1 lock held by khungtaskd/32: #0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 2 locks held by kworker/1:2/772: 2 locks held by kworker/1:3/975: 3 locks held by kworker/u8:16/4573: #0: ffff88813ff29948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline] #0: ffff88813ff29948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770 kernel/workqueue.c:3340 #1: ffffc9000dd37b80 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline] #1: ffffc9000dd37b80 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770 kernel/workqueue.c:3340 #2: ffffffff8df47400 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3816 2 locks held by getty/5588: #0: ffff88814e64d0a0 (&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+0x449/0x1460 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/5826: #0: ffffffff8df47538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] #0: ffffffff8df47538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:956 2 locks held by kworker/R-wg-cr/5882: 2 locks held by kworker/R-wg-cr/5884: 2 locks held by kworker/R-wg-cr/5885: 2 locks held by kworker/1:4/5886: 2 locks held by kworker/R-wg-cr/5890: 2 locks held by kworker/1:5/5918: 2 locks held by kworker/1:6/5955: 1 lock held by kworker/1:7/5968: 2 locks held by kworker/1:8/7204: 2 locks held by kworker/1:11/7282: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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] __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:346 [inline] watchdog+0xf95/0xfe0 kernel/hung_task.c:515 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:246 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5882 Comm: kworker/R-wg-cr Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: wg-crypt-wg0 wg_packet_decrypt_worker RIP: 0010:__lock_acquire+0xd3d/0x2cf0 kernel/locking/lockdep.c:5251 Code: e3 0d 00 0f 84 0f 07 00 00 41 f6 45 22 10 75 2c 49 89 ae 20 0b 00 00 41 8b 86 28 0b 00 00 ff c0 41 89 86 28 0b 00 00 83 f8 30 <0f> 83 51 18 00 00 3b 05 5f 92 e7 11 0f 87 a4 18 00 00 bd 01 00 00 RSP: 0018:ffffc90000a08010 EFLAGS: 00000083 RAX: 0000000000000003 RBX: 00000000fe09d4ff RCX: 0000000000000000 RDX: 000000005a44979c RSI: 0000000086db7919 RDI: ffff88802e9d5b80 RBP: 0ac0d5affe09d4ff R08: ffffffff823392da R09: ffffffff8df419e0 R10: dffffc0000000000 R11: ffffed100a2ac3be R12: ffff88802e9d6700 R13: ffff88802e9d6700 R14: ffff88802e9d5b80 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff888125f3a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30f16ff8 CR3: 000000000dd3a000 CR4: 0000000000350ef0 Call Trace: lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] __page_table_check_zero+0x87/0x3e0 mm/page_table_check.c:138 page_table_check_alloc include/linux/page_table_check.h:35 [inline] post_alloc_hook+0x247/0x290 mm/page_alloc.c:1847 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xf2b/0x1960 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __kmalloc_cache_noprof+0x41e/0x700 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] dummy_urb_enqueue+0x7c/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1273 usb_hcd_submit_urb+0x328/0x1b80 drivers/usb/core/hcd.c:1546 ath9k_hif_usb_reg_in_cb+0x4d5/0x6f0 drivers/net/wireless/ath/ath9k/hif_usb.c:790 __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1661 dummy_timer+0x85f/0x45b0 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858 handle_softirqs+0x27d/0x850 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:skb_has_frag_list include/linux/skbuff.h:4180 [inline] RIP: 0010:skb_cow_data+0x361/0xc50 net/core/skbuff.c:5336 Code: c0 0f 85 20 08 00 00 44 8b 33 4b 8d 1c 37 48 83 c3 08 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 72 bc f4 f8 4c 8b 23 <4d> 85 e4 0f 84 5c 06 00 00 48 89 5c 24 28 45 31 ed 31 ff 48 8b 5c RSP: 0018:ffffc900032874d0 EFLAGS: 00000246 RAX: 1ffff110064a4511 RBX: ffff888032522888 RCX: ffff88802e9d5b80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880269b7e90 RBP: dffffc0000000000 R08: ffffc9000328793f R09: ffffc90003287620 R10: dffffc0000000000 R11: fffff52000650f28 R12: 0000000000000000 R13: ffff8880269b7dc0 R14: 0000000000000180 R15: ffff888032522700 decrypt_packet drivers/net/wireguard/receive.c:268 [inline] wg_packet_decrypt_worker+0x4c6/0xd40 drivers/net/wireguard/receive.c:501 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 rescuer_thread+0x851/0xed0 kernel/workqueue.c:3528 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:246