usb 2-1: USB disconnect, device number 86 ------------[ cut here ]------------ workqueue: work disable count underflowed WARNING: kernel/workqueue.c:4409 at work_offqd_enable kernel/workqueue.c:4409 [inline], CPU#1: kworker/1:4/5822 WARNING: kernel/workqueue.c:4409 at enable_work+0x1c7/0x230 kernel/workqueue.c:4580, CPU#1: kworker/1:4/5822 Modules linked in: CPU: 1 UID: 0 PID: 5822 Comm: kworker/1:4 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:work_offqd_enable kernel/workqueue.c:4409 [inline] RIP: 0010:enable_work+0x1c7/0x230 kernel/workqueue.c:4580 Code: df 83 37 00 4d 85 f6 75 48 e8 d5 83 37 00 eb 47 e8 ce 83 37 00 90 0f 0b 90 e9 bc fe ff ff e8 c0 83 37 00 48 8d 3d 39 cb 86 0e <67> 48 0f b9 3a e9 d2 fe ff ff e8 aa 83 37 00 90 0f 0b 90 e9 1d ff RSP: 0018:ffffc9000412f160 EFLAGS: 00010087 RAX: ffffffff818cb710 RBX: 0000000000000000 RCX: 0000000000100000 RDX: ffffc90017ba5000 RSI: 0000000000007c71 RDI: ffffffff90138250 RBP: 0000000000000000 R08: ffff88805ca8173f R09: 1ffff1100b9502e7 R10: dffffc0000000000 R11: ffffed100b9502e8 R12: 1ffff1100b9502e7 R13: 001fffffffc00001 R14: ffff88805ca81738 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881255b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3c9328 CR3: 0000000057a52000 CR4: 00000000003526f0 Call Trace: __cancel_work_sync+0xf7/0x110 kernel/workqueue.c:4450 thermal_zone_device_unregister+0x23e/0x3f0 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:571 [inline] __device_release_driver drivers/base/dd.c:1284 [inline] device_release_driver_internal+0x46f/0x860 drivers/base/dd.c:1307 bus_remove_device+0x34d/0x440 drivers/base/bus.c:616 device_del+0x527/0x8f0 drivers/base/core.c:3878 hid_remove_device drivers/hid/hid-core.c:3008 [inline] hid_destroy_device+0x6b/0x1b0 drivers/hid/hid-core.c:3030 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:573 [inline] __device_release_driver drivers/base/dd.c:1284 [inline] device_release_driver_internal+0x4d9/0x860 drivers/base/dd.c:1307 bus_remove_device+0x34d/0x440 drivers/base/bus.c:616 device_del+0x527/0x8f0 drivers/base/core.c:3878 usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1418 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:3275 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: df 83 37 00 4d 85 filds -0x7ab2ffc9(%rbx) 6: f6 75 48 divb 0x48(%rbp) 9: e8 d5 83 37 00 call 0x3783e3 e: eb 47 jmp 0x57 10: e8 ce 83 37 00 call 0x3783e3 15: 90 nop 16: 0f 0b ud2 18: 90 nop 19: e9 bc fe ff ff jmp 0xfffffeda 1e: e8 c0 83 37 00 call 0x3783e3 23: 48 8d 3d 39 cb 86 0e lea 0xe86cb39(%rip),%rdi # 0xe86cb63 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 d2 fe ff ff jmp 0xffffff06 34: e8 aa 83 37 00 call 0x3783e3 39: 90 nop 3a: 0f 0b ud2 3c: 90 nop 3d: e9 .byte 0xe9 3e: 1d .byte 0x1d 3f: ff .byte 0xff