Fix buffer pin leak in heap update redo routine.
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.
Branch
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REL9_1_STABLE
Details
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http://git.postgresql.org/pg/commitdiff/f4ecfbcaf046845b58c551184449e8e438d44c69
Modified Files
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src/backend/access/heap/heapam.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)