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

read-write to 0xffff888009616a80 of 4 bytes by task 10670 on cpu 0:
 __d_lookup_done+0x84/0x230 fs/dcache.c:2655
 d_lookup_done include/linux/dcache.h:370 [inline]
 __lookup_slow+0x205/0x250 fs/namei.c:1545
 lookup_slow fs/namei.c:1561 [inline]
 walk_component+0x2a5/0x350 fs/namei.c:1861
 link_path_walk+0x471/0x730 fs/namei.c:2182
 path_openat+0x19f/0x20a0 fs/namei.c:3367
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x240 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1192
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888009616a80 of 4 bytes by task 11570 on cpu 1:
 dentry_unlist fs/dcache.c:544 [inline]
 __dentry_kill+0x1e7/0x450 fs/dcache.c:575
 dentry_kill fs/dcache.c:692 [inline]
 dput+0x203/0x420 fs/dcache.c:885
 handle_mounts fs/namei.c:1389 [inline]
 step_into+0x43b/0xe80 fs/namei.c:1691
 walk_component+0x190/0x350 fs/namei.c:1867
 link_path_walk+0x471/0x730 fs/namei.c:2182
 path_openat+0x19f/0x20a0 fs/namei.c:3367
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x240 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1192
 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: 11570 Comm: systemd-udevd Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================