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MDEV-25026 Various code paths are accessing freed pages
The test case encryption.innodb_encrypt_freed was failing in MemorySanitizer builds. recv_recover_page(): Mark non-recovered pages as freed. fil_crypt_rotate_page(): Before comparing the block->frame contents, check if the block was marked as freed. Other places: Whenever using BUF_GET_POSSIBLY_FREED, check the block->page.status before accessing the page frame. (Both uses of BUF_GET_IF_IN_POOL should be correct now.)
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