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BUG: KCSAN: data-race in _copy_to_iter / fat16_ent_put

write to 0xffff88814093344c of 2 bytes by task 5909 on cpu 1:
 fat16_ent_put+0x28/0x60
 fat_alloc_clusters+0x4b5/0xa60
 fat_get_block+0x25c/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+0x175/0x290
 generic_file_write_iter+0x7d/0x1c0
 do_iter_write+0x418/0x700
 vfs_writev+0x199/0x300
 __se_sys_pwritev2+0x10c/0x1d0
 __x64_sys_pwritev2+0x78/0x90
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888140933400 of 1024 bytes by task 3650 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: 3650 Comm: udevd Not tainted 6.2.0-rc6-syzkaller-00258-gdb27c22251e7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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