Re: PostgreSQL 17: Bug in libpq when libpq is dlopened/closed multiple times

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Jacob Champion <jacob(dot)champion(at)enterprisedb(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Daniel Schreiber <daniel(dot)schreiber(at)hrz(dot)tu-chemnitz(dot)de>
Subject: Re: PostgreSQL 17: Bug in libpq when libpq is dlopened/closed multiple times
Date: 2026-04-22 19:23:53
Message-ID: 1309665.1776885833@sss.pgh.pa.us
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Jacob Champion <jacob(dot)champion(at)enterprisedb(dot)com> writes:
> If anyone has thoughts on that, I'd love to hear them. I don't mind
> removing this unnecessary code in HEAD, or even backpatching as a
> courtesy -- but if it were up to me, I would not guarantee zero global
> resource leaks across libpq and its entire dependency graph.

I agree that we have no real ability to guarantee that.
Still, as far as the presented patch goes, it seems like a clear
win so I'd vote for fix-and-backpatch.

Should we write the arguments as BIO_TYPE_NONE | BIO_TYPE_SOURCE_SINK
rather than just BIO_TYPE_SOURCE_SINK?

regards, tom lane

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