Re: [cgiapp] Troubleshooting Apache2 segfaults

[Michael Peters <suppressed>]

Joel Gwynn wrote:
> I'm getting back to working on my CGI::Application::Dispatch project,
> and I seem to be getting  messages like these in my apache error log
> on about 1 in every 10 hits to the site:

Can you reproduce it?

> [notice] child pid 21763 exit signal Segmentation fault (11)
> 
> The only modules installed are mod_actions, mod_perl, mod_rewrite, and
> mod_userdir
> 
> I'm not getting any more useful information besides the above error
> message.

And that's all you'll get with a segfault unfortunately. It means that something
is wrong in the underlying C code (either in Apache (unlikely), mod_* (slightly
more likely) or in a C based Perl module you're using (the most likely). To find
out where you'll need to get Apache to dump core and then analyze it. You can
find out some preliminary info (like where the segfault happened) even if you
didn't build with debug symbols. But ultimately if that doesn't help you'll need
to build with debugging symbols to get the full trace with arguments.

To see more info about getting apache to dump core and how to analyze it:
http://perl.apache.org/docs/2.0/devel/debug/c.html#Getting_the_core_File_Dumped

-- 
Michael Peters
Developer
Plus Three, LP


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