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Commit 98e6e89040a0534ca26914c66cae9dd49ef62ad9 made inadequate provision for the case of a single-page shared tidbitmap. It allocate space for a shared PagetableEntry, but failed to initialize it. Report by Thomas Munro. Patch by Dilip Kumar, with some comment changes by me. Discussion: http://postgr.es/m/CAEepm=19Cmnfbi-j2Bw-a6yGPeHE1OVhKvvKz9bRBTJGKfGHMA@mail.gmail.com