Fix assertion failure in pgbench when handling multiple pipeline sync messages.
Previously, when running pgbench in pipeline mode with a custom script
that triggered retriable errors (e.g., serialization errors),
an assertion failure could occur:
Assertion failed: (res == ((void*)0)), function discardUntilSync, file pgbench.c, line 3515.
The root cause was that pgbench incorrectly assumed only a single
pipeline sync message would be received at the end. In reality,
multiple pipeline sync messages can be sent and must be handled properly.
This commit fixes the issue by updating pgbench to correctly process
multiple pipeline sync messages, preventing the assertion failure.
Back-patch to v15, where the bug was introduced.
Author: Fujii Masao <masao.fujii@gmail.com>
Reviewed-by: Tatsuo Ishii <ishii@postgresql.org>
Discussion: https://postgr.es/m/CAHGQGwFAX56Tfx+1ppo431OSWiLLuW72HaGzZ39NkLkop6bMzQ@mail.gmail.com
Backpatch-through: 15
Branch
------
REL_18_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/fee46ab4f2440c835a18aa1fdfaebf6ceb85ae09
Modified Files
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src/bin/pgbench/pgbench.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
