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BUG: KCSAN: data-race in __dentry_kill / lookup_fast

read-write to 0xffff88812d7dbb40 of 4 bytes by task 12777 on cpu 0:
 dentry_unlist fs/dcache.c:519 [inline]
 __dentry_kill+0x13f/0x450 fs/dcache.c:575
 dentry_kill fs/dcache.c:692 [inline]
 dput+0x203/0x420 fs/dcache.c:878
 do_renameat2+0x579/0x930 fs/namei.c:4461
 __do_sys_rename fs/namei.c:4503 [inline]
 __se_sys_rename fs/namei.c:4501 [inline]
 __x64_sys_rename+0x3a/0x40 fs/namei.c:4501
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812d7dbb40 of 4 bytes by task 4891 on cpu 1:
 d_revalidate fs/namei.c:767 [inline]
 lookup_fast+0x15f/0x370 fs/namei.c:1493
 open_last_lookups fs/namei.c:3144 [inline]
 path_openat+0x48e/0x20a0 fs/namei.c:3366
 do_filp_open+0xbd/0x1d0 fs/namei.c:3396
 do_sys_openat2+0xa3/0x240 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_open fs/open.c:1192 [inline]
 __se_sys_open fs/open.c:1188 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1188
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4891 Comm: systemd-journal Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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