From: Tom Lane <tgl@sss.pgh.pa.us>
To: Stephen Frost <sfrost@snowman.net>
cc: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>,
        PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: Re: check failure with -DRELCACHE_FORCE_RELEASE
 -DCLOBBER_FREED_MEMORY
In-reply-to: <22846.1488660113@sss.pgh.pa.us>
References: <7b52f900-0579-cda9-ae2e-de5da17090e6@2ndQuadrant.com>
 <2b2c4bc2-160c-8626-1374-c0da6a638339@2ndQuadrant.com>
 <22846.1488660113@sss.pgh.pa.us>
Comments: In-reply-to Tom Lane <tgl@sss.pgh.pa.us>
	message dated "Sat, 04 Mar 2017 15:41:53 -0500"
Date: Sat, 04 Mar 2017 16:16:51 -0500
Message-ID: <40492.1488662211@sss.pgh.pa.us>
Precedence: bulk
Sender: pgsql-hackers-owner@postgresql.org

I wrote:
> Andrew Dunstan <andrew.dunstan@2ndquadrant.com> writes:
>> On 03/03/2017 02:24 PM, Andrew Dunstan wrote:
>>> I have been setting up a buildfarm member with -DRELCACHE_FORCE_RELEASE
>>> -DCLOBBER_FREED_MEMORY, settings which Alvaro suggested to me.I got core
>>> dumps with these stack traces. The platform is Amazon Linux.

>> I have replicated this on a couple of other platforms (Fedora, FreeBSD)
>> and back to 9.5. The same failure doesn't happen with buildfarm runs on
>> earlier branches, although possibly they don't have the same set of tests.

> well, the problem in rebuild_relation() seems pretty blatant:

I fixed that, and the basic regression tests no longer crash outright with
these settings, but I do see half a dozen errors that all seem to be in
RLS-related tests.  They all look like something is trying to access an
already-closed relcache entry, much like the problem in
rebuild_relation().  But I have no time to look closer for the next
several days.  Stephen, I think this is your turf anyway.

			regards, tom lane


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