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MDEV-10104 Table lock race condition with replication
Problem was two race condtion in Aria page cache: - find_block() didn't inform free_block() that it had released requests - free_block() didn't handle pinned blocks, which could happen if free_block() was called as part of flush. This is fixed by not freeing blocks that are pinned. This is safe as when maria_close() is called when last thread is using a table, there can be no pinned blocks. For other flush calls it's safe to ignore pinned blocks.
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