watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [kworker/1:5:5250] Modules linked in: irq event stamp: 15098279 hardirqs last enabled at (15098278): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (15098278): [] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194 hardirqs last disabled at (15098279): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (15098270): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (15098270): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 softirqs last disabled at (15098273): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (15098273): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (15098273): [] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 5250 Comm: kworker/1:5 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 06 01 38 fa 48 89 df e8 ee 4e 38 fa f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 e5 d9 2b fa 65 8b 05 5e 30 75 05 85 c0 74 16 5b RSP: 0018:ffffc900001a8c00 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff888109f5c000 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffffff88dec92b RDI: ffffffff878e97a0 RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8881342f9d10 R13: ffff88810a3d7470 R14: 1ffff920000351b0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888268a6a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb11d2996c0 CR3: 000000011ec14000 CR4: 00000000003506f0 Call Trace: spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] dummy_timer+0x1d58/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:2012 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x516/0x990 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858 handle_softirqs+0x1dd/0x8f0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xed/0x150 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+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:stack_access_ok+0xc/0x1d0 arch/x86/kernel/unwind_orc.c:405 Code: 41 5f 5d e9 16 54 e7 05 e8 a1 73 e4 05 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df 41 55 <41> 54 49 89 d4 48 89 fa 55 48 c1 ea 03 48 89 f5 53 48 89 fb 48 83 RSP: 0018:ffffc900021ce8a8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff8b3af2d4 RDX: 0000000000000008 RSI: ffffc900021ced30 RDI: ffffc900021ce928 RBP: ffffc900021ce970 R08: ffffffff8b3af2d8 R09: 0000000000000007 R10: 0000000000000200 R11: 0000000000010b24 R12: ffffc900021ce978 R13: ffffc900021ce928 R14: ffffc900021ced38 R15: ffffc900021ce95c deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline] unwind_next_frame+0xb0b/0x1ea0 arch/x86/kernel/unwind_orc.c:600 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x292/0x7d0 mm/slub.c:5315 __alloc_skb+0x156/0x410 net/core/skbuff.c:679 __netdev_alloc_skb+0x7a/0x8f0 net/core/skbuff.c:754 netdev_alloc_skb include/linux/skbuff.h:3484 [inline] dev_alloc_skb include/linux/skbuff.h:3497 [inline] ath6kl_usb_post_recv_transfers.constprop.0+0x55/0x3d0 drivers/net/wireless/ath/ath6kl/usb.c:428 ath6kl_usb_start_recv_pipes drivers/net/wireless/ath/ath6kl/usb.c:498 [inline] hif_start drivers/net/wireless/ath/ath6kl/usb.c:703 [inline] ath6kl_usb_power_on+0x8e/0x160 drivers/net/wireless/ath/ath6kl/usb.c:1062 ath6kl_hif_power_on drivers/net/wireless/ath/ath6kl/hif-ops.h:136 [inline] ath6kl_core_init+0x173/0x11b0 drivers/net/wireless/ath/ath6kl/core.c:97 ath6kl_usb_probe+0xcd0/0x13e0 drivers/net/wireless/ath/ath6kl/usb.c:1168 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x340 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086 bus_probe_device+0x64/0x160 drivers/base/bus.c:574 device_add+0x11d9/0x1950 drivers/base/core.c:3689 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x340 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086 bus_probe_device+0x64/0x160 drivers/base/bus.c:574 device_add+0x11d9/0x1950 drivers/base/core.c:3689 usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x5da/0xe40 kernel/workqueue.c:3421 kthread+0x3b3/0x730 kernel/kthread.c:463 ret_from_fork+0x6c3/0xa20 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5230 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:rb_next lib/rbtree.c:488 [inline] RIP: 0010:rb_next+0xaa/0x130 lib/rbtree.c:463 Code: 48 89 d0 48 8d 78 10 48 89 fa 48 c1 ea 03 80 3c 1a 00 75 53 48 8b 50 10 48 85 d2 75 e3 48 83 c4 08 5b 5d 41 5c e9 96 2d 07 00 <48> 8d 78 08 48 89 fa 48 c1 ea 03 42 80 3c 22 00 75 4c 48 3b 58 08 RSP: 0018:ffffc90000007dc8 EFLAGS: 00000092 RAX: ffffc9000190fd70 RBX: ffffc900016ffd70 RCX: ffffffff874fb620 RDX: 1ffff920002dffaf RSI: ffffffff874fb6b0 RDI: ffffc900016ffd78 RBP: ffffc9000190fd71 R08: 0000000000000006 R09: ffffc9000190fd71 R10: ffffc900016ffd70 R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff8881f56280c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88826896a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e063fff CR3: 0000000124310000 CR4: 00000000003506f0 Call Trace: rb_erase_cached include/linux/rbtree.h:152 [inline] timerqueue_del+0xd8/0x150 lib/timerqueue.c:57 __remove_hrtimer+0x9e/0x2a0 kernel/time/hrtimer.c:1114 __run_hrtimer kernel/time/hrtimer.c:1757 [inline] __hrtimer_run_queues+0x40c/0x990 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x397/0x8c0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x109/0x3c0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x8a/0xb0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2037 [inline] RIP: 0010:vprintk_emit+0x553/0x6b0 kernel/printk/printk.c:2425 Code: 00 4d 85 ed 0f 85 1b 01 00 00 e8 78 54 20 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 46 4f 20 00 48 85 ed 0f 85 27 01 00 00 58 54 20 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00 RSP: 0018:ffffc900021bf508 EFLAGS: 00000287 RAX: 000000000002aaed RBX: 000000000000003c RCX: ffffc900108ab000 RDX: 0000000000100000 RSI: ffffffff8190e8c4 RDI: ffff888112123a80 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff92000437ea3 R13: 0000000000000200 R14: ffff888114279d40 R15: ffffc900021bf6c8 dev_vprintk_emit+0x394/0x3e0 drivers/base/core.c:4914 dev_printk_emit+0xd2/0x10d drivers/base/core.c:4925 __dev_printk+0xcb/0x100 drivers/base/core.c:4937 _dev_info+0xef/0x127 drivers/base/core.c:4983 hub_port_init.cold+0x124/0x389 drivers/usb/core/hub.c:4996 hub_port_connect drivers/usb/core/hub.c:5496 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x2f27/0x4af0 drivers/usb/core/hub.c:5953 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x5da/0xe40 kernel/workqueue.c:3421 kthread+0x3b3/0x730 kernel/kthread.c:463 ret_from_fork+0x6c3/0xa20 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246