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From "Rodrigo Aliste P." <rali...@gmail.com>
Subject Re: [users@httpd] Apache intermittent crash - HELP!!!
Date Thu, 17 Dec 2009 02:13:04 GMT
Gary:

The same thing happened to one of my servers. After long research I got to
the conclusion that the problem was caused by the XCache module. If you have
it, try to disable it.


Rodrigo

2009/12/16 gary lim <garylim.in@gmail.com>

> Hi,
>
> 1. Unfortunately, our website depend heavily on PHP to operate, so it not
> possible for us to disable it. We also highly suspect that the crash is
> related to one of our php module because we are running a lot of Joomla
> component.
>
> 2. unfortunately, we are unable to track which module is causing this
> issue. Any idea how we can check which script is causing the problem because
> this has been going on for weeks and we are still unable to determine the
> source.
>
> 3. Kindly advise how we can perform the migration of our existing codebase
> to FastCGI/SCGI without breaking the current website?
>
>
> rgds
>
>
> On Thu, Dec 17, 2009 at 12:28 AM, Tom Evans <tevans.uk@googlemail.com>wrote:
>
>> On Wed, Dec 16, 2009 at 4:20 PM, gary lim <garylim.in@gmail.com> wrote:
>> >
>> > 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
>> >
>> > httpd.conf output
>> > # prefork MPM [DEFAULT IF USE=-threads]
>> > # StartServers: number of server processes to start
>> > # MinSpareServers: minimum number of server processes which are kept
>> spare
>> > # MaxSpareServers: maximum number of server processes which are kept
>> spare
>> > # MaxClients: maximum number of server processes allowed to start
>> > # MaxRequestsPerChild: maximum number of requests a server process
>> serves
>> > <IfModule prefork.c>
>> >     StartServers         2
>> >     MinSpareServers      4
>> >     MaxSpareServers     6
>> >     MaxClients         100
>> >     MaxRequestsPerChild  500
>> > </IfModule>
>> >
>> > # worker MPM [DEFAULT IF USE=threads]
>> > # StartServers: initial number of server processes to start
>> > # MaxClients: maximum number of simultaneous client connections
>> > # MinSpareThreads: minimum number of worker threads which are kept spare
>> > # MaxSpareThreads: maximum number of worker threads which are kept spare
>> > # ThreadsPerChild: constant number of worker threads in each server
>> process
>> > # MaxRequestsPerChild: maximum number of requests a server process
>> serves
>> > <IfModule worker.c>
>> >     StartServers         2
>> >     MaxClients         100
>> >     MinSpareThreads     25
>> >     MaxSpareThreads     75
>> >     ThreadsPerChild     25
>> >     MaxRequestsPerChild  500
>> > </IfModule>
>> >
>> >
>> >
>> > top output
>> > top - 00:09:00 up 157 days, 23:12,  2 users,  load average: 0.67, 0.85,
>> 0.80
>> > Tasks:  47 total,   1 running,  46 sleeping,   0 stopped,   0 zombie
>> > Cpu(s):  8.3% us,  1.4% sy,  0.0% ni, 88.0% id,  2.2% wa,  0.0% hi,
>> 0.0% si
>> > Mem:    917652k total,   858880k used,    58772k free,   142820k buffers
>> > Swap:  1048568k total,    37844k used,  1010724k free,   434476k cached
>> >
>> > 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 ***
>> > [Wed Dec 16 23:53:07 2009] [warn] child process 1325 still did not exit,
>> sending a SIGTERM
>> > [Wed Dec 16 23:53:07 2009] [warn] child process 19910 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:07 2009] [warn] child process 10569 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:07 2009] [warn] child process 16964 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:07 2009] [warn] child process 19718 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:09 2009] [warn] child process 1325 still did not exit,
>> sending a SIGTERM
>> > [Wed Dec 16 23:53:09 2009] [warn] child process 19910 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:09 2009] [warn] child process 10569 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:09 2009] [warn] child process 16964 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:09 2009] [warn] child process 19718 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:11 2009] [warn] child process 1325 still did not exit,
>> sending a SIGTERM
>> > [Wed Dec 16 23:53:11 2009] [warn] child process 19910 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:11 2009] [warn] child process 10569 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:11 2009] [warn] child process 16964 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:11 2009] [warn] child process 19718 still did not
>> exit, sending a SIGTERM
>> > [Wed Dec 16 23:53:13 2009] [error] child process 1325 still did not
>> exit, sending a SIGKILL
>> > [Wed Dec 16 23:53:13 2009] [error] child process 19910 still did not
>> exit, sending a SIGKILL
>> > [Wed Dec 16 23:53:13 2009] [error] child process 10569 still did not
>> exit, sending a SIGKILL
>> > [Wed Dec 16 23:53:13 2009] [error] child process 16964 still did not
>> exit, sending a SIGKILL
>> >
>> >
>> > Joomla / PHP / Apache
>> > System Information
>> > PHP built On: Linux trillian 2.6.16.29-ab1-xenU #1 SMP Sat Sep 23
>> 19:20:15 SGT 2006 i686
>> > Database Version: 5.0.24a-log
>> > PHP Version: 5.1.6-pl4-gentoo
>> > Web Server: Apache
>> > WebServer to PHP interface: apache2handler
>> > Joomla! Version: Joomla! 1.0.15 Stable [ Daytime ] 22 February 2008
>> 23:00 UTC
>> > User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.15)
>> Gecko/2009101601 Firefox/3.0.15 (.NET CLR 3.5.30729)
>> >
>> > Mysql
>> > mysql  Ver 14.12 Distrib 5.0.24a, for pc-linux-gnu (i686) using readline
>> 5.1
>> >
>>
>> Does it work if you disable PHP? Does it still exhibit problems if you
>> run PHP out of process, eg using fastcgi or scgi (can PHP talk SCGI?).
>> For my money, the double free()s are coming from PHP or a PHP module.
>>
>> Cheers
>>
>> Tom
>>
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>>
>


-- 
Rodrigo Aliste P.

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