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BUG: KCSAN: data-race in _copy_to_iter / strncpy

write to 0xffff88811aab4488 of 1 bytes by task 21512 on cpu 1:
 strncpy+0x9b/0x150
 ext4_file_open+0x361/0x3f0
 do_dentry_open+0x5b3/0x930
 vfs_open+0x47/0x50
 path_openat+0x16b5/0x1b70
 do_filp_open+0xf6/0x200
 do_sys_openat2+0xb5/0x2a0
 __x64_sys_openat+0xf3/0x120
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88811aab4400 of 1024 bytes by task 21501 on cpu 0:
 _copy_to_iter+0x136/0x8f0
 copy_page_to_iter+0x1ba/0x3c0
 filemap_read+0x1234/0x1530
 blkdev_read_iter+0x2ca/0x370
 vfs_read+0x39a/0x560
 ksys_read+0xeb/0x1a0
 __x64_sys_read+0x42/0x50
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21501 Comm: udevd Not tainted 6.2.0-rc7-syzkaller-00002-gd2d11f342b17-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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