On Thu, Mar 9, 2017 at 10:02 PM, Dilip Kumar <dilipbal...@gmail.com> wrote: > I slightly modified your query to reproduce this issue. > > explain analyze select * from r1 where value<555; > > Patch is attached to fix the problem.
I forgot to mention the cause of the problem. if (istate->schunkptr < istate->nchunks) { PagetableEntry *chunk = &ptbase[idxchunks[istate->schunkptr]]; PagetableEntry *page = &ptbase[idxpages[istate->spageptr]]; BlockNumber chunk_blockno; In above if condition we have only checked istate->schunkptr < istate->nchunks that means we have some chunk left so we are safe to access idxchunks, But just after that we are accessing ptbase[idxpages[istate->spageptr]] without checking that accessing idxpages is safe or not. tbm_iterator already handling this case, I broke it in tbm_shared_iterator. -- Regards, Dilip Kumar EnterpriseDB: http://www.enterprisedb.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers