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The ginfast.c code previously checked for conflicts in before locking the relevant buffer, leaving a window where a RW conflict could be missed. Re-order. There was also a place where buffer ID and block number were confused while trying to predicate-lock a page, noted by visual inspection. Back-patch to all supported releases. Fixes one more problem discovered with the reproducer from bug #17949, in this case when Dmitry tried other index types. Reported-by: Artem Anisimov <artem.anisimov.255@gmail.com> Reported-by: Dmitry Dolgov <9erthalion6@gmail.com> Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Discussion: https://postgr.es/m/17949-a0f17035294a55e2%40postgresql.org |
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