From: Tom Lane <tgl@sss.pgh.pa.us>
To: Michael Paquier <michael@paquier.xyz>
Cc: Robert Treat <rob@xzilla.net>
Cc: Jim Jones <jim.jones@uni-muenster.de>
Cc: Postgres hackers <pgsql-hackers@lists.postgresql.org>
Cc: Erik Wienhold <ewie@ewie.name>
Subject: Re: Regression with large XML data input
Date: Sun, 27 Jul 2025 22:16:47 -0400
Message-ID: <314265.1753669007@sss.pgh.pa.us> (raw)
In-Reply-To: <aIbb3TOq3XP923e5@paquier.xyz>
References: <aIGknLuc8b8ega2X@paquier.xyz>
<1569825.1753327718@sss.pgh.pa.us>
<1685956.1753380629@sss.pgh.pa.us>
<1691195.1753383449@sss.pgh.pa.us>
<1721385.1753385039@sss.pgh.pa.us>
<7a9a9804-01d8-4489-a831-1a222bae6705@uni-muenster.de>
<aILK3nMlw6pp-XhA@paquier.xyz>
<CABV9wwOY3pH+pA0R1hSq5g_DXqeDaGWRuoBEE4QwWLfTiw+nKw@mail.gmail.com>
<1944118.1753467686@sss.pgh.pa.us>
<aIbb3TOq3XP923e5@paquier.xyz>
Michael Paquier <michael@paquier.xyz> writes:
> On Fri, Jul 25, 2025 at 02:21:26PM -0400, Tom Lane wrote:
>> However, from Jim Jones' result upthread, a "minor update" of libxml2
>> could also have caused this problem: 2.9.7 and 2.9.14 behave
>> differently. So we don't have sole control --- or sole responsibility
>> --- here.
> This sentence is incorrect after I have double-checked the behaviors I
> am seeing based on local builds of libxml2 2.9.7 and 2.9.14.
Hmm, okay, I misread Jim's results then. But there still remains
the big question: what reason is there to believe that it's safe
to return to the old behavior? If newer libxml2 versions report
XML_ERR_RESOURCE_LIMIT on the same input, doesn't it seem likely
that there's a live hazard in the old code?
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, michael@paquier.xyz, rob@xzilla.net, jim.jones@uni-muenster.de, pgsql-hackers@lists.postgresql.org, ewie@ewie.name
Subject: Re: Regression with large XML data input
In-Reply-To: <314265.1753669007@sss.pgh.pa.us>
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