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BUG: KCSAN: data-race in __d_instantiate / step_into

write to 0xffff888105ecddb0 of 8 bytes by task 22422 on cpu 1:
 __d_set_inode_and_type fs/dcache.c:345 [inline]
 __d_instantiate+0x1f9/0x3b0 fs/dcache.c:2008
 d_instantiate_new+0x5c/0xf0 fs/dcache.c:2054
 ext4_mkdir+0x5e5/0x740 fs/ext4/namei.c:3050
 vfs_mkdir+0x1ef/0x2f0 fs/namei.c:4106
 do_mkdirat+0x12f/0x2a0 fs/namei.c:4129
 __do_sys_mkdirat fs/namei.c:4144 [inline]
 __se_sys_mkdirat fs/namei.c:4142 [inline]
 __x64_sys_mkdirat+0x50/0x60 fs/namei.c:4142
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888105ecddb0 of 8 bytes by task 22425 on cpu 0:
 step_into+0x123/0x800 fs/namei.c:1844
 open_last_lookups fs/namei.c:3569 [inline]
 path_openat+0x10da/0x1d70 fs/namei.c:3776
 do_filp_open+0xf6/0x200 fs/namei.c:3809
 do_sys_openat2+0xab/0x110 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_open fs/open.c:1463 [inline]
 __se_sys_open fs/open.c:1459 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1459
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000000000 -> 0xffff888105c18a48

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22425 Comm: syz-executor.1 Not tainted 6.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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