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BUG: KCSAN: data-race in __d_instantiate / step_into

write to 0xffff888106bccdb0 of 8 bytes by task 5694 on cpu 1:
 __d_set_inode_and_type fs/dcache.c:344 [inline]
 __d_instantiate+0x1f9/0x3c0 fs/dcache.c:1853
 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_mkdirat fs/namei.c:4164 [inline]
 __se_sys_mkdirat fs/namei.c:4162 [inline]
 __x64_sys_mkdirat+0x50/0x60 fs/namei.c:4162
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffff888106bccdb0 of 8 bytes by task 5704 on cpu 0:
 step_into+0x123/0x810 fs/namei.c:1846
 walk_component+0x169/0x230 fs/namei.c:2010
 lookup_last fs/namei.c:2461 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2485
 do_o_path+0x44/0x120 fs/namei.c:3770
 path_openat+0x1a73/0x1d80 fs/namei.c:3792
 do_filp_open+0xf7/0x200 fs/namei.c:3826
 do_sys_openat2+0xab/0x120 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_openat fs/open.c:1437 [inline]
 __se_sys_openat fs/open.c:1432 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1432
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x0000000000000000 -> 0xffff888106926ec8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5704 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-12955-g8e938e398669 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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EXT4-fs warning (device loop4): dx_probe:832: inode #2: comm syz-executor.4: Unrecognised inode hash code 20
EXT4-fs warning (device loop4): dx_probe:965: inode #2: comm syz-executor.4: Corrupt directory, running e2fsck is recommended