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Date: Mon, 2 Sep 2013 13:35:08 -0400
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 <CAKUrXK5dSY=iv5NM0kqd-7j8_gPiVAhV+N24ZSfr6KtiQtemiA@mail.gmail.com>
Subject: Re: Debugging "segmentation fault"
From: Jeff Trawick <trawick@gmail.com>
To: Igor Chudov <ichudov@gmail.com>
Cc: Mod_Perl <modperl@perl.apache.org>
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On Mon, Sep 2, 2013 at 1:12 PM, Igor Chudov <ichudov@gmail.com> wrote:

> I run a busy website algebra.com on a CentOS server.
>
> Occasionally, apache processes crash with a "segmentation fault".
>
> I often get 140+ object requests per second, so isolating which request
> caused segfault, by looking at logs, is not practicable.
>
> I want to know if I can at least isolate the cause of the problem to a URL
> (webpage) that caused it to crash. A stack dump would be ideal, but if I
> can get URL and parameters, that would already be very nice.
>
> Any suggestions?
>

non-Perl-specific:

mod_log_forensic
http://httpd.apache.org/docs/2.2/mod/mod_log_forensic.html

mod_whatkilledus (usually with mod_backtrace):
http://emptyhammock.com/projects/httpd/diag/legacy_exception_hook.html

http://emptyhammock.com/projects/httpd/diag/index.html


-- 
Born in Roswell... married an alien...
http://emptyhammock.com/

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<div dir=3D"ltr">On Mon, Sep 2, 2013 at 1:12 PM, Igor Chudov <span dir=3D"l=
tr">&lt;<a href=3D"mailto:ichudov@gmail.com" target=3D"_blank">ichudov@gmai=
l.com</a>&gt;</span> wrote:<br><div class=3D"gmail_extra"><div class=3D"gma=
il_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div dir=3D"ltr">I run a busy website <a href=3D"http://al=
gebra.com" target=3D"_blank">algebra.com</a> on a CentOS server.<div>
<br></div><div>Occasionally, apache processes crash with a &quot;segmentati=
on fault&quot;.<div><br></div><div>I often get 140+ object requests per sec=
ond, so isolating which request caused segfault, by looking at logs, is not=
 practicable.</div>


</div><div><br></div><div>I want to know if I can at least isolate the caus=
e of the problem to a URL (webpage) that caused it to crash. A stack dump w=
ould be ideal, but if I can get URL and parameters, that would already be v=
ery nice.=A0</div>


<div><br></div><div>Any suggestions?</div></div>
</blockquote></div><br>non-Perl-specific:</div><div class=3D"gmail_extra"><=
br></div><div class=3D"gmail_extra">mod_log_forensic</div><div class=3D"gma=
il_extra"><a href=3D"http://httpd.apache.org/docs/2.2/mod/mod_log_forensic.=
html">http://httpd.apache.org/docs/2.2/mod/mod_log_forensic.html</a></div>
<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">mod_whatkil=
ledus (usually with mod_backtrace):</div><a href=3D"http://emptyhammock.com=
/projects/httpd/diag/legacy_exception_hook.html">http://emptyhammock.com/pr=
ojects/httpd/diag/legacy_exception_hook.html</a><br clear=3D"all">
<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra"><a href=3D"=
http://emptyhammock.com/projects/httpd/diag/index.html">http://emptyhammock=
.com/projects/httpd/diag/index.html</a></div><div class=3D"gmail_extra"><br=
></div>
<div class=3D"gmail_extra"><div><br></div>-- <br>Born in Roswell... married=
 an alien...<br><a href=3D"http://emptyhammock.com/" target=3D"_blank">http=
://emptyhammock.com/</a><br>
</div></div>

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