syzbot

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BUG: KCSAN: data-race in fsnotify_parent / vfs_rename

write to 0xffff8880b6198780 of 4 bytes by task 12064 on cpu 0:
 dont_mount include/linux/dcache.h:352 [inline]
 vfs_rename+0x985/0x1130 fs/namei.c:4297
 do_renameat2+0x9e8/0xa50 fs/namei.c:4437
 __do_sys_rename fs/namei.c:4483 [inline]
 __se_sys_rename fs/namei.c:4481 [inline]
 __x64_sys_rename+0x44/0x60 fs/namei.c:4481
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b6198780 of 4 bytes by task 5286 on cpu 1:
 fsnotify_parent+0x4d/0x1b0 fs/notify/fsnotify.c:153
 fsnotify_file include/linux/fsnotify.h:74 [inline]
 fsnotify_close include/linux/fsnotify.h:281 [inline]
 __fput+0x121/0x500 fs/file_table.c:266
 ____fput+0x1b/0x30 fs/file_table.c:313
 task_work_run+0xba/0x120 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2ae/0x2c0 arch/x86/entry/common.c:165
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x38b/0x3b0 arch/x86/entry/common.c:305
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5286 Comm: systemd-udevd Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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