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BUG: KCSAN: data-race in d_lru_add / lookup_fast

read to 0xffff888124414d80 of 4 bytes by task 24069 on cpu 1:
 d_is_miss include/linux/dcache.h:394 [inline]
 d_is_negative include/linux/dcache.h:440 [inline]
 lookup_fast+0xdf/0x700 fs/namei.c:1575
 do_last fs/namei.c:3274 [inline]
 path_openat+0x2ac/0x36e0 fs/namei.c:3525
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888124414d80 of 4 bytes by task 24068 on cpu 0:
 d_lru_add+0x56/0xf0 fs/dcache.c:400
 retain_dentry fs/dcache.c:653 [inline]
 dput+0x417/0x750 fs/dcache.c:854
 path_put fs/namei.c:482 [inline]
 put_link fs/namei.c:877 [inline]
 step_into fs/namei.c:1762 [inline]
 do_last fs/namei.c:3373 [inline]
 path_openat+0x1ec9/0x36e0 fs/namei.c:3525
 do_filp_open+0x11e/0x1b0 fs/namei.c:3555
 do_sys_open+0x3b3/0x4f0 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1110
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24068 Comm: blkid Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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