watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [kworker/0:4:5234] Modules linked in: irq event stamp: 15532148 hardirqs last enabled at (15532147): [] __local_bh_enable_ip+0x9e/0x120 kernel/softirq.c:455 hardirqs last disabled at (15532148): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (15532146): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (15532146): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 softirqs last disabled at (15532144): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (15532144): [] __alloc_skb+0x35d/0x410 net/core/skbuff.c:672 CPU: 0 UID: 0 PID: 5234 Comm: kworker/0:4 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:__orc_find+0x4/0xf0 arch/x86/kernel/unwind_orc.c:86 Code: 90 90 90 90 90 90 48 8b 07 c3 cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 <41> 55 49 89 cd 89 d1 41 54 4c 8d 64 8f fc 55 53 48 83 ec 08 85 d2 RSP: 0018:ffffc900028fe980 EFLAGS: 00000202 RAX: ffffffff8b349390 RBX: 0000000000000001 RCX: ffffffff82130b3e RDX: 0000000000000010 RSI: ffffffff8b349390 RDI: ffffffff8adb5254 RBP: ffffc900028fea50 R08: ffffffff8b3493f0 R09: 0000000000000001 R10: 0000000000000200 R11: 000000000001130b R12: ffffc900028fea58 R13: ffffc900028fea08 R14: ffffc900028fea3d R15: ffffffff82130b3e FS: 0000000000000000(0000) GS:ffff8882689d8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff838467dac CR3: 000000011761c000 CR4: 00000000003506f0 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:238 [inline] unwind_next_frame+0x2ec/0x1ea0 arch/x86/kernel/unwind_orc.c:510 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 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kmalloc_noprof+0x33e/0x990 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+0x87/0x3d0 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+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: 21026 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 dvb_usb_read_remote_control RIP: 0010:hrtimer_get_softexpires_tv64 include/linux/hrtimer.h:149 [inline] RIP: 0010:__hrtimer_run_queues+0x326/0x990 kernel/time/hrtimer.c:1838 Code: 6e 58 4d 85 ed 0f 84 b5 04 00 00 e8 54 3b 13 00 48 8b 5c 24 68 e8 4a 3b 13 00 49 8d 7d 20 48 89 f8 48 c1 e8 03 42 80 3c 38 00 <0f> 85 38 05 00 00 49 8b 6d 20 48 89 de 48 89 ef e8 45 35 13 00 48 RSP: 0018:ffffc900001a8e50 EFLAGS: 00000046 RAX: 1ffff92000fa8fb2 RBX: 000001d2d33702d0 RCX: ffff8881f5728198 RDX: ffff8881017a57c0 RSI: ffffffff819e06b6 RDI: ffffc90007d47d90 RBP: 0000000000000000 R08: 0000000000000005 R09: 000000000000001f R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881f57280c0 R13: ffffc90007d47d70 R14: ffff8881f5728140 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888268ad8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff452b8ff8 CR3: 000000011a552000 CR4: 00000000003506f0 Call Trace: 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 98 56 20 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 66 51 20 00 48 85 ed 0f 85 27 01 00 00 78 56 20 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00 RSP: 0018:ffffc90006717a18 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000017 RCX: ffffffff8190ec9a RDX: ffff8881017a57c0 RSI: ffffffff8190eca4 RDI: ffff8881017a57c0 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff92000ce2f45 R13: 0000000000000200 R14: ffff8881135dd7c0 R15: ffffc90006717ae0 _printk+0xcf/0x110 kernel/printk/printk.c:2451 m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline] m920x_rc_core_query.cold+0x13/0x30 drivers/media/usb/dvb-usb/m920x.c:226 dvb_usb_read_remote_control+0xdd/0x1b0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:261 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