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BUG: KCSAN: data-race in _copy_to_iter / fat16_ent_put

write to 0xffff88812a72941a of 2 bytes by task 14596 on cpu 0:
 fat16_ent_put+0x28/0x60
 fat_ent_write+0x62/0xe0
 fat_chain_add+0x15f/0x400
 fat_get_block+0x467/0x5e0
 __block_write_begin_int+0x2ed/0xc40
 block_write_begin+0x7c/0x180
 cont_write_begin+0x3d1/0x500
 fat_write_begin+0x61/0xf0
 generic_perform_write+0x1c3/0x3d0
 __generic_file_write_iter+0xe6/0x290
 generic_file_write_iter+0x7d/0x1c0
 vfs_write+0x45a/0x750
 ksys_write+0xeb/0x1a0
 __x64_sys_write+0x42/0x50
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88812a729400 of 1024 bytes by task 5860 on cpu 1:
 _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: 1 PID: 5860 Comm: udevd Not tainted 6.2.0-rc7-syzkaller-00011-g05ecb680708a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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