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BUG: KCSAN: data-race in __fsnotify_parent / vfs_rename

read-write to 0xffff88810d9fba80 of 4 bytes by task 10687 on cpu 1:
 dont_mount include/linux/dcache.h:355 [inline]
 vfs_rename+0xcd9/0xe20 fs/namei.c:4322
 do_renameat2+0x5c3/0x900 fs/namei.c:4457
 __do_sys_rename fs/namei.c:4508 [inline]
 __se_sys_rename fs/namei.c:4506 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4506
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810d9fba80 of 4 bytes by task 4892 on cpu 0:
 __fsnotify_parent+0x7d/0x430 fs/notify/fsnotify.c:187
 fsnotify_parent include/linux/fsnotify.h:68 [inline]
 fsnotify_file include/linux/fsnotify.h:90 [inline]
 fsnotify_perm+0x296/0x2d0 include/linux/fsnotify.h:115
 security_file_permission+0x87/0xa0 security/security.c:1452
 rw_verify_area+0x136/0x250 fs/read_write.c:400
 vfs_read+0xde/0x5c0 fs/read_write.c:487
 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: 4892 Comm: systemd-udevd Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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