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BUG: KCSAN: data-race in __dentry_kill / lookup_fast

write to 0xffff8880b59730c0 of 4 bytes by task 22482 on cpu 1:
 dentry_unlist fs/dcache.c:519 [inline]
 __dentry_kill+0x127/0x3b0 fs/dcache.c:575
 dentry_kill fs/dcache.c:698 [inline]
 dput+0x399/0x700 fs/dcache.c:859
 path_put_conditional fs/namei.c:863 [inline]
 follow_managed+0x205/0x720 fs/namei.c:1359
 do_last fs/namei.c:3438 [inline]
 path_openat+0xbc5/0x2f70 fs/namei.c:3607
 do_filp_open+0x11e/0x1b0 fs/namei.c:3637
 do_sys_openat2+0x4f5/0x620 fs/open.c:1149
 do_sys_open+0xa2/0x110 fs/open.c:1165
 __do_sys_openat fs/open.c:1179 [inline]
 __se_sys_openat fs/open.c:1174 [inline]
 __x64_sys_openat+0x5d/0x70 fs/open.c:1174
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b59730c0 of 4 bytes by task 22479 on cpu 0:
 d_revalidate fs/namei.c:765 [inline]
 lookup_fast+0x1cd/0x6e0 fs/namei.c:1690
 do_last fs/namei.c:3361 [inline]
 path_openat+0x2db/0x2f70 fs/namei.c:3607
 do_filp_open+0x11e/0x1b0 fs/namei.c:3637
 do_sys_openat2+0x4f5/0x620 fs/open.c:1149
 do_sys_open+0xa2/0x110 fs/open.c:1165
 __do_sys_openat fs/open.c:1179 [inline]
 __se_sys_openat fs/open.c:1174 [inline]
 __x64_sys_openat+0x5d/0x70 fs/open.c:1174
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22479 Comm: syz-executor.5 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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