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BUG: KCSAN: data-race in _copy_to_iter / fat12_ent_put

write to 0xffff8881277ce80c of 1 bytes by task 6996 on cpu 0:
 fat12_ent_put+0x7a/0x180 fs/fat/fatent.c:168
 fat_alloc_clusters+0x4b5/0xa60 fs/fat/fatent.c:503
 fat_add_cluster fs/fat/inode.c:108 [inline]
 __fat_get_block fs/fat/inode.c:155 [inline]
 fat_get_block+0x25c/0x5e0 fs/fat/inode.c:190
 __block_write_begin_int+0x349/0xe50 fs/buffer.c:2034
 __block_write_begin fs/buffer.c:2084 [inline]
 block_write_begin+0x7c/0x180 fs/buffer.c:2145
 cont_write_begin+0x4c0/0x6f0 fs/buffer.c:2504
 fat_write_begin+0x61/0xf0 fs/fat/inode.c:230
 generic_perform_write+0x1c3/0x3d0 mm/filemap.c:3926
 __generic_file_write_iter+0x175/0x290 mm/filemap.c:4022
 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4086
 call_write_iter include/linux/fs.h:1851 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x45a/0x750 fs/read_write.c:584
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 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 0xffff8881277ce800 of 1024 bytes by task 3457 on cpu 1:
 instrument_copy_to_user include/linux/instrumented.h:120 [inline]
 copyout lib/iov_iter.c:169 [inline]
 _copy_to_iter+0x136/0x8f0 lib/iov_iter.c:523
 copy_page_to_iter+0x1a8/0x310 lib/iov_iter.c:721
 copy_folio_to_iter include/linux/uio.h:174 [inline]
 filemap_read+0x438/0x680 mm/filemap.c:2745
 blkdev_read_iter+0x2ca/0x370 block/fops.c:606
 call_read_iter include/linux/fs.h:1845 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x39a/0x560 fs/read_write.c:470
 ksys_read+0xeb/0x1a0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:621
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3457 Comm: udevd Not tainted 6.3.0-rc2-syzkaller-00016-g4979bf866825 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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