watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [kworker/0:0:9] Modules linked in: irq event stamp: 18858552 hardirqs last enabled at (18858551): [] ___slab_alloc+0xa4d/0x1ca0 mm/slub.c:4555 hardirqs last disabled at (18858552): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (18858540): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (18858540): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 softirqs last disabled at (18858538): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (18858538): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 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:memset_orig+0x3a/0xb0 arch/x86/lib/memset_64.S:71 Code: 01 48 0f af c1 41 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 <48> 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 RSP: 0018:ffffc9000009ec68 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000080 RCX: 0000000000000000 RDX: 0000000000000080 RSI: 0000000000000000 RDI: ffff888113f75340 RBP: ffffc9000009ecd0 R08: 0000000000000068 R09: 0000000000000000 R10: ffff888113f75300 R11: ffff888101ab0aa8 R12: ffff888100041a00 R13: 0000000000000820 R14: 0000000000000001 R15: 0000000000000068 FS: 0000000000000000(0000) GS:ffff888268bf4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeae358ff8 CR3: 00000000090a6000 CR4: 00000000003506f0 Call Trace: slab_post_alloc_hook mm/slub.c:4956 [inline] slab_alloc_node mm/slub.c:5263 [inline] __kmalloc_cache_noprof+0x2ac/0x7e0 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] dummy_urb_enqueue+0xa3/0x920 drivers/usb/gadget/udc/dummy_hcd.c:1273 usb_hcd_submit_urb+0x25b/0x1cf0 drivers/usb/core/hcd.c:1546 usb_submit_urb+0x899/0x1970 drivers/usb/core/urb.c:587 ath6kl_usb_post_recv_transfers.constprop.0+0x201/0x400 drivers/net/wireless/ath/ath6kl/usb.c:450 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 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 10/25/2025 Workqueue: events legacy_dvb_usb_read_remote_control RIP: 0010:cfs_rq_min_slice kernel/sched/fair.c:757 [inline] RIP: 0010:enqueue_task_fair+0x4d4/0x21f0 kernel/sched/fair.c:6933 Code: f0 48 85 ed 74 24 48 8d 7d 50 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 74 06 0f 8e 64 16 00 00 80 7d 50 00 0f 85 1b 02 00 00 <49> c7 c7 ff ff ff ff 48 85 d2 74 21 48 8d 7b 28 48 89 f8 48 c1 e8 RSP: 0018:ffffc900001a8c60 EFLAGS: 00000046 RAX: 1ffff110242c8189 RBX: ffff88811277d850 RCX: ffff88811277d850 RDX: ffff88811277d840 RSI: ffff888121640c38 RDI: ffff888121640c38 RBP: 0000000000000000 R08: 1ffff110242c8188 R09: 0000000000000001 R10: ffff8881f57390c0 R11: ffff888103e84528 R12: dffffc0000000000 R13: ffff888121640c00 R14: ffff88811277d840 R15: ffff88811277d8e8 FS: 0000000000000000(0000) GS:ffff888268cf4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe777382a60 CR3: 00000001199b0000 CR4: 00000000003506f0 Call Trace: enqueue_task+0xd0/0x270 kernel/sched/core.c:2094 activate_task kernel/sched/core.c:2135 [inline] ttwu_do_activate+0x12e/0x890 kernel/sched/core.c:3631 ttwu_queue kernel/sched/core.c:3894 [inline] try_to_wake_up+0x72d/0x1480 kernel/sched/core.c:4218 hrtimer_wakeup+0x47/0x60 kernel/time/hrtimer.c:2013 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841 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 25 1e 21 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 e3 18 21 00 48 85 ed 0f 85 25 01 00 00 05 1e 21 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00 RSP: 0018:ffffc90000277978 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000017 RCX: ffffffff815ed27b RDX: ffff888103e83a80 RSI: ffffffff815ed285 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: ffff888103e84528 R12: 1ffff9200004ef31 R13: 0000000000000200 R14: ffff888101ab0000 R15: ffffc90000277a40 _printk+0xc7/0x100 kernel/printk/printk.c:2451 m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline] m920x_rc_query+0x496/0x770 drivers/media/usb/dvb-usb/m920x.c:193 legacy_dvb_usb_read_remote_control+0x10c/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:123 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