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BUG: KCSAN: data-race in __d_instantiate / lookup_fast

read-write to 0xffff8881458f4b40 of 4 bytes by task 23775 on cpu 0:
 __d_instantiate+0x2cd/0x3b0
 d_instantiate_new+0x5c/0xf0
 ext4_mkdir+0x5e5/0x740
 vfs_mkdir+0x27d/0x380
 do_mkdirat+0xf5/0x260
 __x64_sys_mkdir+0x44/0x50
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881458f4b40 of 4 bytes by task 23774 on cpu 1:
 lookup_fast+0xd9/0x290
 walk_component+0x3f/0x230
 path_lookupat+0x10a/0x2a0
 filename_lookup+0x126/0x300
 user_path_at_empty+0x42/0x110
 __se_sys_mount+0x24b/0x2d0
 __x64_sys_mount+0x67/0x80
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00080000 -> 0x00280040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23774 Comm: syz-executor.1 Tainted: G        W          6.2.0-rc6-syzkaller-00273-g837c07cf68fe-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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