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Re: Recent SIGSEGV failures in buildfarm HEAD

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Seneca Cunningham <tentra(at)gmail(dot)com>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: Recent SIGSEGV failures in buildfarm HEAD
Date: 2006-12-31 05:29:32
Message-ID: 27035.1167542972@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
Seneca Cunningham <tentra(at)gmail(dot)com> writes:
> I don't have a core, but here's the CrashReporter output for both
> of jackal's failed runs:

Wow, some actual data, rather than just noodling about how to get it ...
thanks!

> ...
> 11  postgres 	0x0022b2e3 RelationIdGetRelation + 110 (relcache.c:1496)
> 12  postgres 	0x00020868 relation_open + 84 (heapam.c:697)
> 13  postgres 	0x0002aab9 index_open + 32 (indexam.c:140)
> 14  postgres 	0x0002a9d4 systable_beginscan + 289 (genam.c:184)
> 15  postgres 	0x002279e4 RelationInitIndexAccessInfo + 1645 (relcache.c:1200)
> 16  postgres 	0x0022926a RelationBuildDesc + 3527 (relcache.c:866)
> 17  postgres 	0x0022b2e3 RelationIdGetRelation + 110 (relcache.c:1496)
> 18  postgres 	0x00020868 relation_open + 84 (heapam.c:697)
> 19  postgres 	0x0002aab9 index_open + 32 (indexam.c:140)
> 20  postgres 	0x0002a9d4 systable_beginscan + 289 (genam.c:184)
> 21  postgres 	0x002279e4 RelationInitIndexAccessInfo + 1645 (relcache.c:1200)
> 22  postgres 	0x0022926a RelationBuildDesc + 3527 (relcache.c:866)
> 23  postgres 	0x0022b2e3 RelationIdGetRelation + 110 (relcache.c:1496)
> ...

What you seem to have here is infinite recursion during relcache
initialization.  That's surely not hard to believe, considering I just
whacked that code around, and indeed changed some of the tests that are
intended to prevent such recursion.  But what I don't understand is why
it'd be platform-specific, much less not perfectly repeatable on the
platforms where it does manifest.  Anyone have a clue?

			regards, tom lane

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