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Fix buffer pin leak in heap update redo routine.

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In a heap update, if the old and new tuple were on different pages, and the
new page no longer existed (because it was subsequently truncated away by
vacuum), heap_xlog_update forgot to release the pin on the old buffer. This
bug was introduced by the "Fix multiple problems in WAL replay" patch,
commit 3bbf668de9f1bc172371681e80a4e769b6d014c8 (on master branch).

With full_page_writes=off, this triggered an "incorrect local pin count"
error later in replay, if the old page was vacuumed.

This fixes bug #7969, reported by Yunong Xiao. Backpatch to 9.0, like the
commit that introduced this bug.
This commit is contained in:
Heikki Linnakangas 2013-03-27 21:51:27 +02:00
parent 96103c6a0f
commit 1b315c5391
1 changed files with 4 additions and 0 deletions
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4
src/backend/access/heap/heapam.c
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@ -5367,7 +5367,11 @@ newt:;
ItemPointerGetBlockNumber(&(xlrec->newtid)), ItemPointerGetBlockNumber(&(xlrec->newtid)),
false); false);
if (!BufferIsValid(nbuffer)) if (!BufferIsValid(nbuffer))
{
if (BufferIsValid(obuffer))
UnlockReleaseBuffer(obuffer);
return; return;
}
page = (Page) BufferGetPage(nbuffer); page = (Page) BufferGetPage(nbuffer);
if (XLByteLE(lsn, PageGetLSN(page))) /* changes are applied */ if (XLByteLE(lsn, PageGetLSN(page))) /* changes are applied */