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BUG: KCSAN: data-race in d_alloc_parallel / d_set_d_op

read to 0xffff888125635240 of 4 bytes by task 7911 on cpu 0:
 d_wait_lookup fs/dcache.c:2500 [inline]
 d_alloc_parallel+0x884/0xe00 fs/dcache.c:2588
 __lookup_slow+0xb4/0x2a0 fs/namei.c:1646
 lookup_slow+0x4f/0x70 fs/namei.c:1680
 walk_component+0x4a2/0xe70 fs/namei.c:1800
 lookup_last fs/namei.c:2263 [inline]
 path_lookupat.isra.0+0x13a/0x5a0 fs/namei.c:2308
 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 0xffff888125635240 of 4 bytes by task 7910 on cpu 1:
 d_set_d_op+0x17b/0x230 fs/dcache.c:1854
 simple_lookup fs/libfs.c:70 [inline]
 simple_lookup+0xaa/0xb0 fs/libfs.c:65
 __lookup_slow+0x129/0x2a0 fs/namei.c:1663
 lookup_slow+0x4f/0x70 fs/namei.c:1680
 walk_component+0x4a2/0xe70 fs/namei.c:1800
 lookup_last fs/namei.c:2263 [inline]
 path_lookupat.isra.0+0x13a/0x5a0 fs/namei.c:2308
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7910 Comm: modprobe Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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