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BUG: KCSAN: data-race in __fsnotify_parent / vfs_rename

write to 0xffff8880b321f3c0 of 4 bytes by task 19855 on cpu 1:
 dont_mount include/linux/dcache.h:354 [inline]
 vfs_rename+0x9a3/0xe30 fs/namei.c:4319
 do_renameat2+0x554/0x940 fs/namei.c:4456
 __do_sys_rename fs/namei.c:4502 [inline]
 __se_sys_rename fs/namei.c:4500 [inline]
 __x64_sys_rename+0x3a/0x40 fs/namei.c:4500
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b321f3c0 of 4 bytes by task 19860 on cpu 0:
 __fsnotify_parent+0x79/0x470 fs/notify/fsnotify.c:180
 fsnotify_parent include/linux/fsnotify.h:68 [inline]
 fsnotify_file include/linux/fsnotify.h:90 [inline]
 fsnotify_perm+0x292/0x2d0 include/linux/fsnotify.h:115
 security_file_open+0x85/0x90 security/security.c:1578
 do_dentry_open+0x22d/0x890 fs/open.c:804
 vfs_open+0x43/0x50 fs/open.c:931
 do_open fs/namei.c:3251 [inline]
 path_openat+0x1844/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3395
 do_sys_openat2+0x33b/0x500 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_open fs/open.c:1192 [inline]
 __se_sys_open fs/open.c:1188 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1188
 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: 19860 Comm: systemd-udevd Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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