==================================================================
BUG: KCSAN: data-race in retain_dentry / step_into

write to 0xffff88810d940f00 of 4 bytes by task 12664 on cpu 1:
 retain_dentry+0x1de/0x260 fs/dcache.c:660
 dput+0x11e/0x430 fs/dcache.c:881
 path_put fs/namei.c:546 [inline]
 terminate_walk+0x109/0x270 fs/namei.c:643
 path_openat+0x18dc/0x21b0 fs/namei.c:3499
 do_filp_open+0xbd/0x1d0 fs/namei.c:3525
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1214
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810d940f00 of 4 bytes by task 12687 on cpu 0:
 __d_entry_type include/linux/dcache.h:394 [inline]
 d_is_symlink include/linux/dcache.h:424 [inline]
 step_into+0x158/0xec0 fs/namei.c:1773
 open_last_lookups fs/namei.c:3312 [inline]
 path_openat+0x105e/0x21b0 fs/namei.c:3495
 do_filp_open+0xbd/0x1d0 fs/namei.c:3525
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1214
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12687 Comm: syz-executor.5 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================