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Alvaro Herrera
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In the 9.2 code for extending multixact/members, the logic was very simple because the number of entries in a members page was a proper divisor of 2^32, and thus at 2^32 wraparound the logic for page switch was identical than at any other page boundary. In commit 0ac5ad51 I failed to realize this and introduced code that was not able to go over the 2^32 boundary. Fix that by ensuring that when we reach the last page of the last segment we correctly zero the initial page of the initial segment, using correct uint32-wraparound-safe arithmetic. Noticed while investigating bug #8673 reported by Serge Negodyuck, as diagnosed by Andres Freund.
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