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BUG: KCSAN: data-race in __d_instantiate / lookup_fast

read-write to 0xffff888130f0e600 of 4 bytes by task 29481 on cpu 0:
 __d_instantiate+0x2cd/0x3b0 fs/dcache.c:2010
 d_instantiate_new+0x5c/0xf0 fs/dcache.c:2054
 ext4_add_nondir+0x161/0x190 fs/ext4/namei.c:2797
 ext4_create+0x20e/0x2f0 fs/ext4/namei.c:2837
 vfs_create+0x15f/0x250 fs/namei.c:3197
 do_mknodat+0x267/0x3d0 fs/namei.c:4048
 __do_sys_mknod fs/namei.c:4081 [inline]
 __se_sys_mknod fs/namei.c:4079 [inline]
 __x64_sys_mknod+0x53/0x60 fs/namei.c:4079
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888130f0e600 of 4 bytes by task 29482 on cpu 1:
 d_revalidate fs/namei.c:860 [inline]
 lookup_fast+0xd9/0x290 fs/namei.c:1642
 walk_component+0x3f/0x230 fs/namei.c:1997
 lookup_last fs/namei.c:2458 [inline]
 path_lookupat+0x10a/0x2a0 fs/namei.c:2482
 filename_lookup+0x126/0x300 fs/namei.c:2511
 vfs_statx+0xa2/0x430 fs/stat.c:277
 vfs_fstatat fs/stat.c:315 [inline]
 vfs_stat include/linux/fs.h:3083 [inline]
 __do_sys_newstat fs/stat.c:458 [inline]
 __se_sys_newstat+0x6f/0x280 fs/stat.c:454
 __x64_sys_newstat+0x31/0x40 fs/stat.c:454
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x00480000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29482 Comm: syz-executor.0 Not tainted 6.5.0-syzkaller-00453-g727dbda16b83 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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