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The optimized code in 728bd991c3c4 contains a few invalid locking sequences. To wit, the original code would try to acquire an lwlock that it already holds. Avoid this by moving lock acquisitions to higher-level code, and install appropriate assertions in low-level that the correct mode is held. Authors: Michael Paquier, Álvaro Herrera Reported-By: chuanting wang Bug: #14680 Discussion: https://postgr.es/m/20170531033228.1487.10124@wrigleys.postgresql.org