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BUG: KCSAN: data-race in __d_instantiate / step_into

write to 0xffff8881438bb7b0 of 8 bytes by task 18281 on cpu 0:
 __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_add_nondir+0x16c/0x1a0 fs/ext4/namei.c:2797
 ext4_create+0x20f/0x2f0 fs/ext4/namei.c:2838
 lookup_open fs/namei.c:3498 [inline]
 open_last_lookups fs/namei.c:3567 [inline]
 path_openat+0xdde/0x1d60 fs/namei.c:3797
 do_filp_open+0xf7/0x200 fs/namei.c:3827
 do_sys_openat2+0xab/0x120 fs/open.c:1407
 do_sys_open fs/open.c:1422 [inline]
 __do_sys_openat fs/open.c:1438 [inline]
 __se_sys_openat fs/open.c:1433 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1433
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffff8881438bb7b0 of 8 bytes by task 18282 on cpu 1:
 step_into+0x123/0x810 fs/namei.c:1847
 open_last_lookups fs/namei.c:3590 [inline]
 path_openat+0x10fc/0x1d60 fs/namei.c:3797
 do_filp_open+0xf7/0x200 fs/namei.c:3827
 do_sys_openat2+0xab/0x120 fs/open.c:1407
 do_sys_open fs/open.c:1422 [inline]
 __do_sys_openat fs/open.c:1438 [inline]
 __se_sys_openat fs/open.c:1433 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1433
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x0000000000000000 -> 0xffff888106dd2a38

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18282 Comm: syz-executor.3 Not tainted 6.8.0-syzkaller-02737-g1f440397665f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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