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BUG: KCSAN: data-race in __d_instantiate / step_into

read-write to 0xffff888107a2c300 of 4 bytes by task 1688 on cpu 1:
 __d_instantiate+0x2cd/0x3c0 fs/dcache.c:1855
 d_instantiate_new+0x5c/0xf0 fs/dcache.c:1899
 ext4_add_nondir+0x16c/0x1a0 fs/ext4/namei.c:2797
 ext4_mknod+0x210/0x2f0 fs/ext4/namei.c:2872
 vfs_mknod+0x2d4/0x310 fs/namei.c:4001
 do_mknodat+0x276/0x430
 __do_sys_mknod fs/namei.c:4087 [inline]
 __se_sys_mknod fs/namei.c:4085 [inline]
 __x64_sys_mknod+0x53/0x60 fs/namei.c:4085
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffff888107a2c300 of 4 bytes by task 1689 on cpu 0:
 __follow_mount_rcu fs/namei.c:1485 [inline]
 handle_mounts fs/namei.c:1536 [inline]
 step_into+0xe7/0x810 fs/namei.c:1842
 open_last_lookups fs/namei.c:3589 [inline]
 path_openat+0x10fc/0x1d80 fs/namei.c:3796
 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_open fs/open.c:1429 [inline]
 __se_sys_open fs/open.c:1425 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1425
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x00000000 -> 0x00580000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1689 Comm: syz-executor.2 Tainted: G        W          6.8.0-syzkaller-11743-ga4145ce1e7bc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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