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Message-ID: <4304DDB4.5020708@ectoplasm.org>
Date: Thu, 18 Aug 2005 12:12:52 -0700
From: "Philippe M. Chiasson" <gozer@ectoplasm.org>
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To: Gordon Lack <gml4410@ggr.co.uk>
CC: modperl@perl.apache.org
Subject: Re: make test fails (Solaris and Linux, same problem)
References: <4304D0CC.851843EE@ggr.co.uk>
In-Reply-To: <4304D0CC.851843EE@ggr.co.uk>
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Gordon Lack wrote:
> 1. Problem Description:
> 
>    The server core dumps when running make test.
> 
>    This happens on both Solaris and Linux systems (with the equivalent
> perl, Apache and mod_perl configurations).
> 
>    Having got the core dump info I added some printf statements to the
> start of ap_pcw_walk_files_config in modperl_pcw.c to print the values
> of dconf, dconf->sec_file and dconf->sec_file->elts.  
> 
>    This showed:
> 
> GML dconf: ab0e0
> GML dconf->sec_file: 2
> 
> (and then a SIGSEGV trying to use this "2" as a point to get to
> dconf->sec_file->elts).  
> 
> This 2 looks decidely unpointer-like.  Could Apache and mod_perl differ
> over what they think is in a core_dir_config struct and hence
> dconf->sec_file refer to a different offset?

This strange kind of segfaults is usually the syptoms of disagreements in
large-file support in httpd/apr/perl.

Detecting these kind of configuration problems has been discussed before, but
it's not quite as easy as it sounds ;-)

You can see one of the original discussions about this here:
  http://marc.theaimsgroup.com/?t=111686169600002&r=1&w=2

And it's evolution into a solution here:
  http://marc.theaimsgroup.com/?l=apache-modperl-dev&w=2&r=1&s=segfaulting+apache+in+ap_pcw_walk_files_&q=t

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Philippe M. Chiasson m/gozer\@(apache|cpan|ectoplasm)\.org/ GPG KeyID : 88C3A5A5
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