watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [kworker/0:3:5223] Modules linked in: irq event stamp: 11800607 hardirqs last enabled at (11800606): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (11800606): [] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194 hardirqs last disabled at (11800607): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (11800592): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (11800592): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 softirqs last disabled at (11800601): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (11800601): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (11800601): [] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 5223 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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:ffffc90000007c00 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff888109f64000 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffffff88dec92b RDI: ffffffff878e97a0 RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888115060210 R13: ffff88810a380470 R14: 1ffff92000000fb0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88826896a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f931a059d40 CR3: 00000000092a8000 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:__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:ffffc900022eede8 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff888114ca2000 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffffffff88dec92b RDI: ffffffff878e97a0 RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000246 R13: ffff888114ca28c8 R14: ffff888114ca27f8 R15: ffff8881017b3188 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] ath6kl_usb_alloc_urb_from_pipe+0x1e8/0x2a0 drivers/net/wireless/ath/ath6kl/usb.c:148 ath6kl_usb_post_recv_transfers.constprop.0+0x22f/0x3d0 drivers/net/wireless/ath/ath6kl/usb.c:424 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 37 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:info_print_prefix+0xe/0x350 kernel/printk/printk.c:1376 Code: 5f 3e 89 5b e9 53 cd be 05 0f 1f 00 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 57 41 56 <41> 89 f6 41 55 41 89 d5 41 54 55 48 89 fd 53 48 89 cb 49 89 df 48 RSP: 0018:ffffc90000277038 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900002770c8 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffc900002771f8 RBP: 0000000000000012 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000097d10 R12: ffffffff93d575a0 R13: 0000000000000000 R14: ffffc900002771b8 R15: ffffc900002771f8 FS: 0000000000000000(0000) GS:ffff888268a6a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f83efa65fd0 CR3: 000000012915e000 CR4: 00000000003506f0 Call Trace: record_print_text+0x143/0x3c0 kernel/printk/printk.c:1432 printk_get_next_message+0x2d1/0x6c0 kernel/printk/printk.c:3018 console_emit_next_record kernel/printk/printk.c:3083 [inline] console_flush_one_record+0x67c/0xe50 kernel/printk/printk.c:3215 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 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_err+0xef/0x127 drivers/base/core.c:4980 hub_port_init.cold+0xb4/0x389 drivers/usb/core/hub.c:5116 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