Chao Li found a mistake I made in not releasing the buffer content lock in one code path which he reported in another thread [1]. This patch set shares some patches with the patches in that thread, so attached is a corrected v9. - Melanie [1] https://www.postgresql.org/message-id/20E76846-4816-45BC-84F0-D8836D9AFA4C%40gmail.com
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