From: Craig James <craig_james@emolecules.com>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: libgcc double-free, backend won't die
Date: Tue, 11 Dec 2007 07:17:17 -0800
Message-ID: <475EA9FD.9000706@emolecules.com> (raw)
In-Reply-To: <20071211151416.GD10710@alvh.no-ip.org>
References: <C34DDC3D.43F60%llonergan@greenplum.com>
<7EB0D6C0-48E2-4155-8559-9113D3BD2785@ketema.net>
<4728CF7B.7040306@gmail.com>
<4728FB3E.3070709@shaw.ca>
<472978BE.9@hagander.net>
<4729B1E9.2080306@gmail.com>
<475E4133.5080009@emolecules.com>
<20071211112128.GB4708@alvh.no-ip.org>
<475EA754.1090307@emolecules.com>
<20071211151416.GD10710@alvh.no-ip.org>
Alvaro Herrera wrote:
> Craig James wrote:
>
>> Here is my guess -- and this is just a guess. My functions use a
>> third-party library which, of necessity, uses malloc/free in the
>> ordinary way. I suspect that there's a bug in the Postgres palloc()
>> code that's walking over memory that regular malloc() allocates. The
>> third-party library (OpenBabel) has been tested pretty thoroughly by
>> me an others and has no memory corruption problems. All malloc's are
>> freed properly. Does that seem like a possibility?
>
> Not really. palloc uses malloc underneath.
But some Postgres code could be walking off the end of a malloc'ed block, even if palloc() is allocating and deallocating correctly. Which is why I was hoping to use valgrind to see what's going on.
Thanks,
Craig
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To: pgsql-performance@postgresql.org
Cc: craig_james@emolecules.com, alvherre@alvh.no-ip.org
Subject: Re: libgcc double-free, backend won't die
In-Reply-To: <475EA9FD.9000706@emolecules.com>
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