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BUG: KCSAN: data-race in retain_dentry / step_into

write to 0xffff88812a21d900 of 4 bytes by task 19354 on cpu 0:
 retain_dentry+0x1db/0x260 fs/dcache.c:659
 dput+0x10e/0x420 fs/dcache.c:873
 path_put+0x1b/0x30 fs/namei.c:496
 do_utimes+0x1b5/0x290 fs/utimes.c:128
 do_futimesat fs/utimes.c:190 [inline]
 __do_sys_utimes fs/utimes.c:203 [inline]
 __se_sys_utimes fs/utimes.c:200 [inline]
 __x64_sys_utimes+0xa4/0x150 fs/utimes.c:200
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812a21d900 of 4 bytes by task 19356 on cpu 1:
 __d_entry_type include/linux/dcache.h:391 [inline]
 d_is_symlink include/linux/dcache.h:421 [inline]
 step_into+0x158/0xe70 fs/namei.c:1694
 walk_component+0x190/0x350 fs/namei.c:1866
 lookup_last fs/namei.c:2309 [inline]
 path_lookupat+0x12d/0x560 fs/namei.c:2333
 filename_lookup+0xf2/0x380 fs/namei.c:2366
 user_path_at_empty+0x3b/0x50 fs/namei.c:2646
 user_path_at include/linux/namei.h:59 [inline]
 path_setxattr+0x4b/0x170 fs/xattr.c:465
 __do_sys_setxattr fs/xattr.c:485 [inline]
 __se_sys_setxattr fs/xattr.c:481 [inline]
 __x64_sys_setxattr+0x69/0x80 fs/xattr.c:481
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19356 Comm: syz-executor.1 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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