==================================================================
BUG: KCSAN: data-race in __dentry_kill / d_alloc_parallel

read to 0xffff88812546e3c0 of 4 bytes by task 7365 on cpu 0:
 dentry_unlist fs/dcache.c:544 [inline]
 __dentry_kill+0x1be/0x3c0 fs/dcache.c:575
 dentry_kill fs/dcache.c:698 [inline]
 dput+0x3b5/0x750 fs/dcache.c:859
 path_put fs/namei.c:482 [inline]
 terminate_walk+0x107/0x250 fs/namei.c:596
 path_lookupat.isra.0+0x27e/0x5a0 fs/namei.c:2322
 filename_lookup+0x145/0x2b0 fs/namei.c:2338
 user_path_at_empty+0x4c/0x70 fs/namei.c:2598
 user_path_at include/linux/namei.h:49 [inline]
 vfs_statx+0xd9/0x190 fs/stat.c:187
 vfs_stat include/linux/fs.h:3242 [inline]
 __do_sys_newstat+0x51/0xb0 fs/stat.c:341
 __se_sys_newstat fs/stat.c:337 [inline]
 __x64_sys_newstat+0x3a/0x50 fs/stat.c:337
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812546e3c0 of 4 bytes by task 7678 on cpu 1:
 d_alloc_parallel+0x533/0xe00 fs/dcache.c:2610
 __lookup_slow+0xb4/0x2a0 fs/namei.c:1646
 lookup_slow+0x4f/0x70 fs/namei.c:1680
 walk_component+0x4a2/0xe70 fs/namei.c:1800
 link_path_walk.part.0+0x5d3/0xa90 fs/namei.c:2131
 link_path_walk fs/namei.c:2259 [inline]
 path_lookupat.isra.0+0x77/0x5a0 fs/namei.c:2307
 filename_lookup+0x145/0x2b0 fs/namei.c:2338
 user_path_at_empty+0x4c/0x70 fs/namei.c:2598
 user_path_at include/linux/namei.h:49 [inline]
 vfs_statx+0xd9/0x190 fs/stat.c:187
 vfs_lstat include/linux/fs.h:3247 [inline]
 __do_sys_newlstat+0x51/0xb0 fs/stat.c:354
 __se_sys_newlstat fs/stat.c:348 [inline]
 __x64_sys_newlstat+0x3a/0x50 fs/stat.c:348
 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: 1 PID: 7678 Comm: udevd Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================