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BUG: KCSAN: data-race in dont_mount / lookup_fast

read-write to 0xffff8881392fe180 of 4 bytes by task 8799 on cpu 1:
 dont_mount+0x27/0x40 include/linux/dcache.h:352
 vfs_rmdir+0x2a9/0x2f0 fs/namei.c:4195
 do_rmdir+0x194/0x320 fs/namei.c:4248
 __do_sys_rmdir fs/namei.c:4267 [inline]
 __se_sys_rmdir fs/namei.c:4265 [inline]
 __x64_sys_rmdir+0x30/0x40 fs/namei.c:4265
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881392fe180 of 4 bytes by task 7483 on cpu 0:
 d_revalidate fs/namei.c:861 [inline]
 lookup_fast+0xd9/0x290 fs/namei.c:1643
 walk_component fs/namei.c:1998 [inline]
 link_path_walk+0x3f4/0x7e0 fs/namei.c:2329
 path_parentat fs/namei.c:2530 [inline]
 __filename_parentat+0x13b/0x3c0 fs/namei.c:2554
 filename_parentat fs/namei.c:2572 [inline]
 do_unlinkat+0x9b/0x4c0 fs/namei.c:4357
 __do_sys_unlink fs/namei.c:4430 [inline]
 __se_sys_unlink fs/namei.c:4428 [inline]
 __x64_sys_unlink+0x30/0x40 fs/namei.c:4428
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00200008 -> 0x00008008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7483 Comm: udevd Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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