watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [kworker/0:5:5231] Modules linked in: irq event stamp: 11612390 hardirqs last enabled at (11612389): [] ___slab_alloc+0x8e7/0x1ca0 mm/slub.c:4555 hardirqs last disabled at (11612390): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (11612384): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (11612384): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (11612384): [] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723 softirqs last disabled at (11612375): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (11612375): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (11612375): [] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 5231 Comm: kworker/0:5 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_release+0x19e/0x2e0 kernel/locking/lockdep.c:5893 Code: ff 65 0f c1 05 bb 71 3d 0b 83 f8 01 0f 85 f7 00 00 00 9c 58 f6 c4 02 0f 85 0c 01 00 00 41 f7 c6 00 02 00 00 0f 85 99 00 00 00 <48> 8b 44 24 10 65 48 2b 05 ad 2d 3d 0b 0f 85 0f 01 00 00 48 83 c4 RSP: 0018:ffffc900022fe830 EFLAGS: 00000206 RAX: 0000000000000046 RBX: ffffffff894da3a0 RCX: ffffc900022fe83c RDX: 0000000000000005 RSI: ffffffff88dcb92b RDI: ffffffff878e97a0 RBP: ffffffff816f2b7e R08: 0000000000000001 R09: 0000000000000007 R10: 0000000000000200 R11: 000000000003d7f3 R12: ffff8881125c3a80 R13: ffffc900022fe8e8 R14: 0000000000000206 R15: 0000000000000006 FS: 0000000000000000(0000) GS:ffff88826896a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4b53ce3ec0 CR3: 00000000092a8000 CR4: 00000000003506f0 Call Trace: rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x3c3/0x1ea0 arch/x86/kernel/unwind_orc.c:495 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_node_track_caller_noprof+0x34e/0x9a0 mm/slub.c:5764 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:608 __alloc_skb+0x186/0x410 net/core/skbuff.c:690 __netdev_alloc_skb+0x7a/0x8f0 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+0x55/0x3d0 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+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: 5687 Comm: kworker/1:5 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:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data+0x0/0x90 kernel/kcov.c:246 Code: 4e 2b 1a 0b 48 8b 80 58 15 00 00 e9 0a 65 a5 05 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <65> 8b 05 39 2b 1a 0b 49 89 f8 49 89 f1 49 89 d2 65 48 8b 3d 10 2b RSP: 0018:ffffc9001239f2d8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff876a8c65 RCX: ffffffff87512dbe RDX: 0000000000000008 RSI: 0000000000000004 RDI: 0000000000000001 RBP: ffffc9001239f3d0 R08: 0000000000000001 R09: 0000000000000007 R10: 0000000000000001 R11: 000000000075dd00 R12: 0000000000000010 R13: 0000000000000025 R14: ffffc9001239f400 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff888268a6a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9ad1613ec0 CR3: 0000000117614000 CR4: 00000000003506f0 Call Trace: vsnprintf+0x26e/0x1240 lib/vsprintf.c:2907 sprintf+0xcc/0x100 lib/vsprintf.c:3110 print_time kernel/printk/printk.c:1357 [inline] info_print_prefix+0x25a/0x350 kernel/printk/printk.c:1383 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 _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