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BUG: KCSAN: data-race in dev_uevent / usb_gadget_unregister_driver

write to 0xffff888102563078 of 8 bytes by task 11932 on cpu 1:
 usb_gadget_remove_driver drivers/usb/gadget/udc/core.c:1346 [inline]
 usb_gadget_unregister_driver+0x254/0x430 drivers/usb/gadget/udc/core.c:1493
 raw_release+0xac/0x130 drivers/usb/gadget/legacy/raw_gadget.c:400
 __fput+0x243/0x4d0 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:151
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
 exit_to_user_mode_prepare+0x13c/0x170 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888102563078 of 8 bytes by task 11988 on cpu 0:
 dev_uevent+0x213/0x350 drivers/base/core.c:1899
 uevent_show+0x10e/0x1f0 drivers/base/core.c:1971
 dev_attr_show+0x35/0x90 drivers/base/core.c:1673
 sysfs_kf_seq_show+0x152/0x270 fs/sysfs/file.c:61
 kernfs_seq_show+0x74/0x80 fs/kernfs/file.c:167
 seq_read+0x2de/0x890 fs/seq_file.c:208
 kernfs_fop_read+0xce/0x2f0 fs/kernfs/file.c:251
 vfs_read+0x154/0x5c0 fs/read_write.c:494
 ksys_read+0xce/0x180 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:642
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11988 Comm: systemd-udevd Not tainted 5.10.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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