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The code in BootStrapXLOG() and in pg_test_fsync.c tried to align WAL buffers in complicated ways. Also, they still used XLOG_BLCKSZ for the alignment, even though that should now be PG_IO_ALIGN_SIZE. This can now be simplified and made more consistent by using PGAlignedXLogBlock, either directly in BootStrapXLOG() and using alignas in pg_test_fsync.c. Reviewed-by: Chao Li <li.evan.chao@gmail.com> Reviewed-by: Thomas Munro <thomas.munro@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/f462a175-b608-44a1-b428-bdf351e914f4%40eisentraut.org