EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
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BUG: KCSAN: data-race in event_handler / usbip_stop_eh

read-write to 0xffff8881038bfc08 of 8 bytes by task 113 on cpu 1:
 unset_event drivers/usb/usbip/usbip_event.c:36 [inline]
 event_handler+0x1a8/0x330 drivers/usb/usbip/usbip_event.c:80
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
 worker_thread+0x569/0x750 kernel/workqueue.c:3486
 kthread+0x221/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff8881038bfc08 of 8 bytes by task 4936 on cpu 0:
 usbip_stop_eh+0x37/0x120 drivers/usb/usbip/usbip_event.c:118
 vgadget_pullup+0x16a/0x1a0 drivers/usb/usbip/vudc_dev.c:183
 usb_gadget_disconnect_locked+0xc9/0x220 drivers/usb/gadget/udc/core.c:785
 gadget_unbind_driver+0x65/0x210 drivers/usb/gadget/udc/core.c:1718
 device_remove drivers/base/dd.c:616 [inline]
 __device_release_driver drivers/base/dd.c:1349 [inline]
 device_release_driver_internal+0x2c7/0x520 drivers/base/dd.c:1372
 driver_detach+0x167/0x1f0 drivers/base/dd.c:1435
 bus_remove_driver+0x197/0x1d0 drivers/base/bus.c:832
 driver_unregister+0x4e/0x80 drivers/base/driver.c:202
 usb_gadget_unregister_driver+0x33/0x60 drivers/usb/gadget/udc/core.c:1784
 unregister_gadget drivers/usb/gadget/configfs.c:263 [inline]
 gadget_dev_desc_UDC_store+0x115/0x1f0 drivers/usb/gadget/configfs.c:290
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x1cb/0x250 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x57d/0x990 fs/read_write.c:687
 ksys_write+0xdc/0x1a0 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __x64_sys_write+0x40/0x50 fs/read_write.c:747
 x64_sys_call+0x27e1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000007 -> 0x0000000000000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4936 Comm: syz.1.434 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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