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From "Daniel Reinhardt" <crypto...@cryptodan.net>
Subject Re: [users@httpd] Apache intermittent crash - HELP!!!
Date Thu, 17 Dec 2009 14:22:54 GMT


From: gary lim 
Sent: 17 December, 2009 5:05
To: users@httpd.apache.org 
Subject: Re: [users@httpd] Apache intermittent crash - HELP!!!


Hi daniel,

1. the intermittent crash happens even before we did any performance tuning of the apache.

2. the reason why we did the tuning is because we want to limit the apache memory usage which
previously was due to apache using up all the swap mem causing the crash.

rgds



On Thu, Dec 17, 2009 at 12:42 PM, Daniel Reinhardt <cryptodan@cryptodan.net> wrote:

  -->From: gary lim
  -->Sent: 16 December, 2009 16:20
  -->To: users@httpd.apache.org
  -->Subject: [users@httpd] Apache intermittent crash - HELP!!!
  -->
  -->
  -->Dear all, 

  -->
  -->1. I'm using Linux 2.6.16.29 and running on i686 Intel(R) Pentium(R) 4 CPU 3.00GHz
GNU/Linux
  -->2. The below info are my machine config and log output
  -->3. Kindly advise how to resolve intermittent apache crash even after performance tuning

  -->
  -->apache2 error log 

  -->*** glibc detected *** /usr/sbin/apache2: double free or corruption (fasttop): 0x08b4faf0
***
  -->[Tue Dec 15 13:04:22 2009] [error] server reached MaxClients setting, consider raising
the MaxClients setting
  -->*** glibc detected *** /usr/sbin/apache2: double free or corruption (fasttop): 0x086a1170
***
  -->*** glibc detected *** /usr/sbin/apache2: double free or corruption (fasttop): 0x08b48c08
***




  Gary,

  What version of glibc do you have?  The glibc detected could be causing this since its producing
a dump code.  I would revert back to a default setup with your httpd.conf file, and just use
the basics you need for your site to run.  If you get no crashes then its an issue with your
performance tuning.

  Thanks,
  Daniel 


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Gary,

If your application is using all of the SWAP memory maybe its time to rebuild the system with
more swap space or upgrade the RAM.  Can you post the server specs for us?  I have never seen
an application take full use of all the memory and all the allocated swap space.  You have
hardware issues that need to be dealt with before attempting to solve the software ones.

When you list your system specs, can you also tell us if your Kernel has support for higher
memory system configs?

Thanks,
Daniel
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