usb 4-1: USB disconnect, device number 49 ------------[ cut here ]------------ workqueue: work disable count underflowed WARNING: kernel/workqueue.c:4412 at work_offqd_enable kernel/workqueue.c:4412 [inline], CPU#0: kworker/0:2/13327 WARNING: kernel/workqueue.c:4412 at enable_work+0x1c7/0x230 kernel/workqueue.c:4583, CPU#0: kworker/0:2/13327 Modules linked in: CPU: 0 UID: 0 PID: 13327 Comm: kworker/0:2 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:work_offqd_enable kernel/workqueue.c:4412 [inline] RIP: 0010:enable_work+0x1c7/0x230 kernel/workqueue.c:4583 Code: 0f e3 37 00 4d 85 f6 75 48 e8 05 e3 37 00 eb 47 e8 fe e2 37 00 90 0f 0b 90 e9 bc fe ff ff e8 f0 e2 37 00 48 8d 3d 79 46 87 0e <67> 48 0f b9 3a e9 d2 fe ff ff e8 da e2 37 00 90 0f 0b 90 e9 1d ff RSP: 0018:ffffc9000557f020 EFLAGS: 00010083 RAX: ffffffff818e3f90 RBX: 0000000000000000 RCX: 0000000000100000 RDX: ffffc90019669000 RSI: 0000000000007cf6 RDI: ffffffff90158610 RBP: 0000000000000000 R08: ffff88807b468787 R09: 1ffff1100f68d0f0 R10: dffffc0000000000 R11: ffffed100f68d0f1 R12: 1ffff1100f68d0f0 R13: 001fffffffc00001 R14: ffff88807b468780 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812543f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f875500b030 CR3: 000000006276a000 CR4: 00000000003526f0 Call Trace: __cancel_work_sync+0xf7/0x110 kernel/workqueue.c:4453 thermal_zone_device_unregister+0x210/0x380 drivers/thermal/thermal_core.c:1723 psy_unregister_thermal drivers/power/supply/power_supply_core.c:1551 [inline] power_supply_unregister+0xf9/0x140 drivers/power/supply/power_supply_core.c:1767 thunderstrike_destroy drivers/hid/hid-nvidia-shield.c:927 [inline] shield_remove+0x72/0x120 drivers/hid/hid-nvidia-shield.c:1104 hid_device_remove+0x228/0x370 drivers/hid/hid-core.c:-1 device_remove drivers/base/dd.c:631 [inline] __device_release_driver drivers/base/dd.c:1344 [inline] device_release_driver_internal+0x46f/0x870 drivers/base/dd.c:1367 bus_remove_device+0x455/0x570 drivers/base/bus.c:657 device_del+0x527/0x8f0 drivers/base/core.c:3881 hid_remove_device drivers/hid/hid-core.c:3017 [inline] hid_destroy_device+0x6b/0x1b0 drivers/hid/hid-core.c:3039 usbhid_disconnect+0x9f/0xc0 drivers/hid/usbhid/hid-core.c:1477 usb_unbind_interface+0x26e/0x910 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:633 [inline] __device_release_driver drivers/base/dd.c:1344 [inline] device_release_driver_internal+0x4d9/0x870 drivers/base/dd.c:1367 bus_remove_device+0x455/0x570 drivers/base/bus.c:657 device_del+0x527/0x8f0 drivers/base/core.c:3881 usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1478 usb_disconnect+0x32f/0x990 drivers/usb/core/hub.c:2345 hub_port_connect drivers/usb/core/hub.c:5407 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x1cc9/0x4f30 drivers/usb/core/hub.c:5953 process_one_work kernel/workqueue.c:3278 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3361 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3442 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 0f e3 37 pavgw (%rdi),%mm6 3: 00 4d 85 add %cl,-0x7b(%rbp) 6: f6 75 48 divb 0x48(%rbp) 9: e8 05 e3 37 00 call 0x37e313 e: eb 47 jmp 0x57 10: e8 fe e2 37 00 call 0x37e313 15: 90 nop 16: 0f 0b ud2 18: 90 nop 19: e9 bc fe ff ff jmp 0xfffffeda 1e: e8 f0 e2 37 00 call 0x37e313 23: 48 8d 3d 79 46 87 0e lea 0xe874679(%rip),%rdi # 0xe8746a3 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 d2 fe ff ff jmp 0xffffff06 34: e8 da e2 37 00 call 0x37e313 39: 90 nop 3a: 0f 0b ud2 3c: 90 nop 3d: e9 .byte 0xe9 3e: 1d .byte 0x1d 3f: ff .byte 0xff