watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [kworker/0:6:16359] Modules linked in: irq event stamp: 10891742 hardirqs last enabled at (10891741): [] __local_bh_enable_ip+0xa4/0x120 kernel/softirq.c:455 hardirqs last disabled at (10891742): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (10891740): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (10891740): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 softirqs last disabled at (10891738): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (10891738): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 CPU: 0 UID: 0 PID: 16359 Comm: kworker/0:6 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:lock_acquire+0x62/0x330 kernel/locking/lockdep.c:5872 Code: 03 47 0b 83 f8 07 0f 87 a2 02 00 00 89 c0 48 0f a3 05 22 d5 48 09 0f 82 74 02 00 00 8b 35 ba e1 48 09 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 39 03 47 0b 0f 85 ad 02 00 00 48 83 c4 RSP: 0018:ffffc900059de940 EFLAGS: 00000206 RAX: 0000000000000046 RBX: ffffffff892cd6e0 RCX: 00000000243bdd83 RDX: 0000000000000000 RSI: ffffffff88ce314f RDI: ffffffff878a7300 RBP: 0000000000000002 R08: 00000000a9469121 R09: 000000001a946912 R10: 0000000000000002 R11: ffff88811ae68aa8 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888268bf4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f93d1a056c0 CR3: 00000000090a6000 CR4: 00000000003506f0 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 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 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kmalloc_noprof+0x33b/0x8d0 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] usb_alloc_urb+0x66/0xa0 drivers/usb/core/urb.c:75 ath6kl_usb_post_recv_transfers.constprop.0+0x84/0x400 drivers/net/wireless/ath/ath6kl/usb.c:432 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: cdc_wdm 10-1:1.0: Stall on int endpoint NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5337 Comm: kworker/1:6 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:check_kcov_mode kernel/kcov.c:185 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x70 kernel/kcov.c:217 Code: 8b 05 69 d3 22 0b a9 00 01 ff 00 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75 3c a9 00 00 f0 00 75 35 8b 82 64 15 00 00 85 c0 74 2b <8b> 82 40 15 00 00 83 f8 02 75 20 48 8b 8a 48 15 00 00 8b 92 44 15 RSP: 0018:ffffc900001a8460 EFLAGS: 00000002 RAX: 0000000000000001 RBX: 1ffff92000035092 RCX: ffffffff815e8947 RDX: ffff88811db18000 RSI: ffffffff815e8955 RDI: 0000000000000001 RBP: ffffc900001a8698 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000520770 R12: 0000000000000000 R13: 0000000000000001 R14: ffffc900001a84b0 R15: 0000000000000800 FS: 0000000000000000(0000) GS:ffff888268cf4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80ddce3f70 CR3: 0000000125afa000 CR4: 00000000003506f0 Call Trace: printk_get_next_message+0x175/0x6d0 kernel/printk/printk.c:3002 console_emit_next_record kernel/printk/printk.c:3083 [inline] console_flush_one_record+0x684/0xc60 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+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 dev_vprintk_emit drivers/base/core.c:4914 [inline] dev_printk_emit+0xfa/0x140 drivers/base/core.c:4925 __dev_printk+0xf5/0x270 drivers/base/core.c:4937 _dev_err+0xe4/0x120 drivers/base/core.c:4980 wdm_int_callback+0x3dd/0xbd0 drivers/usb/class/cdc-wdm.c:270 __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745 dummy_timer+0x1809/0x3ad0 drivers/usb/gadget/udc/dummy_hcd.c:1995 __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:console_flush_one_record+0x995/0xc60 kernel/printk/printk.c:3216 Code: 00 e8 8f 65 29 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 8d 49 21 00 48 85 ed 0f 85 8e 01 00 00 e8 af 4e 21 00 fb 4c 89 e8 <48> c1 e8 03 42 80 3c 38 00 0f 84 b4 fe ff ff 4c 89 ef e8 74 1b 83 RSP: 0018:ffffc900025cf788 EFLAGS: 00000293 RAX: ffffffff89816558 RBX: 0000000000000001 RCX: ffffffff815e9df3 RDX: ffff88811db18000 RSI: ffffffff815e9e01 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88811db18aa8 R12: 0000000000000001 R13: ffffffff89816558 R14: ffffffff89816500 R15: dffffc0000000000 console_flush_all kernel/printk/printk.c:3289 [inline] __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xef/0x240 kernel/printk/printk.c:3359 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426 _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