Re: xid_wraparound/002_limits.pl might fail due to transient warning

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Alexander Lakhin <exclusion(at)gmail(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: xid_wraparound/002_limits.pl might fail due to transient warning
Date: 2026-09-02 03:03:07
Message-ID: 1306023.1788318187@sss.pgh.pa.us
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Alexander Lakhin <exclusion(at)gmail(dot)com> writes:
> Hello hackers,
> New buildfarm animal partridge (aarch64, maybe with slow storage)
> produced several unprecedented failures of 002_limits, e.g., [1], [2]:

I went looking at this tonight and then found your message. I think
the reason we're not seeing a lot of these in the buildfarm is that
not that many animals are running this test suite (it requires putting
xid_wraparound in PG_TEST_EXTRA). I concur with your conclusion that
poll_query_until is iterating the INSERT an extra time, but I think
a less magic solution would be to just change the test's match rule
to allow that to happen, more or less as attached.

regards, tom lane

Attachment Content-Type Size
stabilize-002_limits-wraparound-test.patch text/x-diff 1.0 KB

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