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BUG: KCSAN: data-race in path_openat / vfs_rename

write to 0xffff888129b05d80 of 4 bytes by task 27450 on cpu 1:
 dont_mount include/linux/dcache.h:357 [inline]
 vfs_rename+0xe4a/0xfb0 fs/namei.c:4551
 do_renameat2+0x59e/0x9b0 fs/namei.c:4696
 __do_sys_rename fs/namei.c:4745 [inline]
 __se_sys_rename fs/namei.c:4743 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4743
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888129b05d80 of 4 bytes by task 1035 on cpu 0:
 __d_entry_type include/linux/dcache.h:394 [inline]
 d_is_reg include/linux/dcache.h:429 [inline]
 do_open fs/namei.c:3353 [inline]
 path_openat+0x16f9/0x20b0 fs/namei.c:3494
 do_filp_open+0xd9/0x1f0 fs/namei.c:3521
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1207
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1035 Comm: systemd-udevd Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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