RE: [users@httpd] Strategies for debugging a segmentation fault o n a production ser ver

[Michael Caplan <mi...@lechateau.ca>]

Marc,

That is exactly what I did originally.  No results though.  The log  is not
written to.

Thanks,

Michael


> -----Original Message-----
> From: Marc Wiatrowski [mailto:wia@iglass.net]
> Sent: Tuesday, June 21, 2005 9:32 AM
> To: users@httpd.apache.org
> Subject: RE: [users@httpd] Strategies for debugging a segmentation fault o
> n a production ser ver
> 
> 
> > > -----Original Message-----
> > > From: Krist van Besien [mailto:krist.vanbesien@gmail.com]
> > > Sent: Tuesday, June 21, 2005 8:22 AM
> > >
> > > > On 6/21/05, Michael Caplan <mi...@lechateau.ca> wrote:
> > > >
> > > > I am looking for some advice on how to go about debugging Apache
> 1.3.33/
> > > > PHP 5.0.4 on a production Linux box (RHE 3).  The scenario is this:
> > > > Once a day we find a segfault in our apache logs.  From our current
> position,
> > > > we don't know what page was accessed, and our 400+ users haven't
> brought
> > > > the issue to our attention.  All we know is the date/time and PID of
> when
> > > > the segfault occurred.  The question is this:  how can we go about
> isolating
> > > > the offending requested page that bombs?
> > >
> > > What you could do is  set up a proxy in front of you server. Let the
> > > proxy log all requests. The request that causes the server to bomb
> > > will probably be listed with an error  message in the proxy's log,
> > > otherwise you always have the timestamps.
> > >
> > > Krist
> > >
> 
> Would adding the PID to your access_log help any?  %P in your logFormat.
> We use the following in our httpd.conf:
> 
> LogFormat "%h %l %u %{[%d/%b/%Y:%T %z]}t \"%r\" %>s %b \"%{User-Agent}i\"
> %{VHOST}e[%P]"
> icombined
> CustomLog /usr/local/apache/logs/access_log icombined
> 
> I believe the access_log entries are written at the end of the process, ie
> the seg
> fault probably happens before the access_log entry is written.  But you
> may be able
> to see where the user is headed..?
> 
> marc
> 
> 
> 
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