watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [kworker/1:4:5237] Modules linked in: irq event stamp: 13872487 hardirqs last enabled at (13872486): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (13872486): [] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194 hardirqs last disabled at (13872487): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13872478): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (13872478): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 softirqs last disabled at (13872481): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13872481): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13872481): [] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 5237 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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 c6 3c 02 fa 48 89 df e8 7e 8f 02 fa f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 c5 e2 f5 f9 65 8b 05 de 36 49 05 85 c0 74 16 5b RSP: 0018:ffffc900001a8bd8 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff888109f94000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff88d036ab RDI: ffffffff878a7200 RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8aa48bd7 R11: ffff88810a727470 R12: ffff888122c73f10 R13: dffffc0000000000 R14: 1ffff920000351ad R15: ffff88810a72749b FS: 0000000000000000(0000) GS:ffff888268cf5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556d0c94a8 CR3: 00000000090a6000 CR4: 00000000003506f0 Call Trace: spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] dummy_timer+0x1e8b/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:2012 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858 handle_softirqs+0x208/0x940 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xfa/0x160 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+0x90/0xb0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:__rcu_read_unlock+0x9/0x5a0 kernel/rcu/tree_plugin.h:432 Code: 5b e9 eb de ff ff e8 76 b0 7b 00 eb e7 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 55 41 54 55 <65> 48 8b 2d d7 af 3c 0b 53 48 8d bd fc 03 00 00 48 b8 00 00 00 00 RSP: 0018:ffffc900023d6858 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffffc900023d69d8 RCX: ffffc900023d683c RDX: 0000000000000005 RSI: ffffffff88ce2bab RDI: ffffffff878a7200 RBP: 0000000000000001 R08: 0000000000000001 R09: 00000000381c204b R10: 0000000000000002 R11: 00000000000033ff R12: ffffc900023d6988 R13: ffffc900023d6938 R14: ffffc900023d69d8 R15: ffffc900023d696c rcu_read_unlock include/linux/rcupdate.h:899 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x3fe/0x20a0 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x2a8/0x7e0 mm/slub.c:5315 __alloc_skb+0x156/0x410 net/core/skbuff.c:679 __netdev_alloc_skb+0x7a/0x920 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+0x55/0x400 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+0x17e/0x11b0 drivers/net/wireless/ath/ath6kl/core.c:97 ath6kl_usb_probe+0xcee/0x1440 drivers/net/wireless/ath/ath6kl/usb.c:1168 usb_probe_interface+0x303/0xa80 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xb20 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086 bus_probe_device+0x64/0x150 drivers/base/bus.c:574 device_add+0x116e/0x1980 drivers/base/core.c:3689 usb_set_configuration+0x1187/0x1e50 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xb1/0x110 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+0x241/0xb20 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x470 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x350 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4e0 drivers/base/dd.c:1031 device_initial_probe+0xaa/0xc0 drivers/base/dd.c:1086 bus_probe_device+0x64/0x150 drivers/base/bus.c:574 device_add+0x116e/0x1980 drivers/base/core.c:3689 usb_new_device+0xd07/0x1a90 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+0x31bf/0x5420 drivers/usb/core/hub.c:5953 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x74f/0xa30 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: 13349 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events dvb_usb_read_remote_control RIP: 0010:timerqueue_getnext include/linux/timerqueue.h:25 [inline] RIP: 0010:__hrtimer_run_queues+0x3b8/0xc40 kernel/time/hrtimer.c:1821 Code: 07 00 00 48 8b 54 24 10 48 c1 e5 07 48 b8 00 00 00 00 00 fc ff df 49 c7 84 2c c8 00 00 00 00 00 00 00 48 c1 ea 03 80 3c 02 00 <0f> 85 49 07 00 00 4c 8b 73 58 4d 85 f6 0f 84 6b 06 00 00 e8 c0 69 RSP: 0018:ffffc90000007e40 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff8881f5628140 RCX: ffffffff816c81a6 RDX: 1ffff1103eac5033 RSI: ffffffff816c8255 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88810a6c4528 R12: ffff8881f56280c0 R13: 0000000000000001 R14: ffffc900017cfd78 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888268bf5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8e72356c0 CR3: 0000000124c70000 CR4: 00000000003506f0 Call Trace: hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x10b/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+0x8b/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+0x556/0x6b0 kernel/printk/printk.c:2425 Code: 00 4d 85 ed 0f 85 19 01 00 00 e8 85 1d 21 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 43 18 21 00 48 85 ed 0f 85 25 01 00 00 65 1d 21 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00 RSP: 0018:ffffc90002427a20 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000017 RCX: ffffffff815ed01b RDX: ffff88810a6c3a80 RSI: ffffffff815ed025 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88810a6c4528 R12: 1ffff92000484f46 R13: 0000000000000200 R14: ffff8881221a3a80 R15: ffffc90002427ae8 _printk+0xc7/0x100 kernel/printk/printk.c:2451 m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline] m920x_rc_core_query+0x2d7/0x500 drivers/media/usb/dvb-usb/m920x.c:229 dvb_usb_read_remote_control+0xdd/0x1c0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:261 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246