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BUG: KCSAN: data-race in __d_instantiate / lookup_fast

read-write to 0xffff888137dc0c00 of 4 bytes by task 9829 on cpu 0:
 __d_instantiate+0x2cd/0x3b0 fs/dcache.c:2011
 d_instantiate_new+0x58/0xe0 fs/dcache.c:2055
 ext4_mkdir+0x5ff/0x760 fs/ext4/namei.c:2963
 vfs_mkdir+0x216/0x320 fs/namei.c:3931
 do_mkdirat+0x105/0x280 fs/namei.c:3957
 __do_sys_mkdirat fs/namei.c:3972 [inline]
 __se_sys_mkdirat fs/namei.c:3970 [inline]
 __x64_sys_mkdirat+0x4c/0x60 fs/namei.c:3970
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888137dc0c00 of 4 bytes by task 9831 on cpu 1:
 d_revalidate fs/namei.c:853 [inline]
 lookup_fast+0x172/0x360 fs/namei.c:1656
 walk_component+0x6b/0x280 fs/namei.c:2016
 lookup_last fs/namei.c:2475 [inline]
 path_lookupat+0x11d/0x2b0 fs/namei.c:2499
 filename_lookup+0x130/0x310 fs/namei.c:2528
 user_path_at_empty+0x3e/0x110 fs/namei.c:2851
 user_path_at include/linux/namei.h:57 [inline]
 path_setxattr+0x60/0x190 fs/xattr.c:591
 __do_sys_setxattr fs/xattr.c:612 [inline]
 __se_sys_setxattr fs/xattr.c:608 [inline]
 __x64_sys_setxattr+0x69/0x80 fs/xattr.c:608
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00080000 -> 0x00280040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9831 Comm: syz-executor.2 Not tainted 5.18.0-rc6-syzkaller-00007-g9be9ed2612b5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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