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BUG: KCSAN: data-race in link_path_walk / vfs_rmdir

write to 0xffff888106733840 of 4 bytes by task 10428 on cpu 1:
 dont_mount include/linux/dcache.h:358 [inline]
 vfs_rmdir+0x1ac/0x2c0 fs/namei.c:3901
 do_rmdir+0x14a/0x2e0 fs/namei.c:3958
 __do_sys_rmdir fs/namei.c:3976 [inline]
 __se_sys_rmdir fs/namei.c:3974 [inline]
 __x64_sys_rmdir+0x2c/0x30 fs/namei.c:3974
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888106733840 of 4 bytes by task 10427 on cpu 0:
 link_path_walk+0x37d/0x780 fs/namei.c:2231
 path_parentat fs/namei.c:2473 [inline]
 filename_parentat+0x104/0x950 fs/namei.c:2495
 do_unlinkat+0x59/0x4f0 fs/namei.c:4063
 __do_sys_unlink fs/namei.c:4139 [inline]
 __se_sys_unlink fs/namei.c:4137 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4137
 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: 10427 Comm: systemd-udevd Not tainted 5.13.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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