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BUG: KCSAN: data-race in __d_instantiate / lookup_fast

read-write to 0xffff888162d526c0 of 4 bytes by task 22758 on cpu 1:
 __d_instantiate+0x2cd/0x3c0 fs/dcache.c:1855
 d_instantiate_new+0x5c/0xf0 fs/dcache.c:1899
 ext4_mkdir+0x5e6/0x740 fs/ext4/namei.c:3047
 vfs_mkdir+0x1f7/0x300 fs/namei.c:4126
 do_mkdirat+0x12f/0x2a0 fs/namei.c:4149
 __do_sys_mkdir fs/namei.c:4169 [inline]
 __se_sys_mkdir fs/namei.c:4167 [inline]
 __x64_sys_mkdir+0x44/0x50 fs/namei.c:4167
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffff888162d526c0 of 4 bytes by task 22759 on cpu 0:
 d_revalidate fs/namei.c:860 [inline]
 lookup_fast+0xd9/0x2a0 fs/namei.c:1641
 walk_component+0x3f/0x230 fs/namei.c:2000
 lookup_last fs/namei.c:2461 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2485
 filename_lookup+0x127/0x300 fs/namei.c:2514
 user_path_at_empty+0x42/0x120 fs/namei.c:2921
 user_path_at include/linux/namei.h:57 [inline]
 path_listxattr fs/xattr.c:861 [inline]
 __do_sys_llistxattr fs/xattr.c:882 [inline]
 __se_sys_llistxattr fs/xattr.c:879 [inline]
 __x64_sys_llistxattr+0x76/0x130 fs/xattr.c:879
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x00000000 -> 0x00280000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22759 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-11567-gb3603fcb79b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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