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Date: Wed, 28 Sep 2011 09:46:14 +0200
From: Rainer Jung <rainer.jung@kippdata.de>
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Subject: Re: [users@httpd] Apache freezes after running for 2 days.

On 26.09.2011 23:35, Abhi Auradkar wrote:
> I have been running the apache server to load test a application. 
> 
> The apache 2.2.20 is running on CentOS 5.6
> 
> -bash-3.2$ uname -a
> Linux hdm102 2.6.18-238.19.1.el5.centos.plus #1 SMP Mon Jul 18 10:05:09
> EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
> -bash-3.2$ cat /etc/issue
> CentOS release 5.6 (Final)
> Kernel \r on an \m
> 
> 
> -bash-3.2$ ./httpd -V
> Server version: Apache/2.2.20 (Unix)
> Server built:   Sep  8 2011 23:41:28
> Server's Module Magic Number: 20051115:28
> Server loaded:  APR 1.4.5, APR-Util 1.3.12
> Compiled using: APR 1.4.5, APR-Util 1.3.12
> Architecture:   64-bit
> Server MPM:     Worker
>   threaded:     yes (fixed thread count)
>     forked:     yes (variable process count)
> Server compiled with....
>  -D APACHE_MPM_DIR="server/mpm/worker"
>  -D APR_HAS_SENDFILE
>  -D APR_HAS_MMAP
>  -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
>  -D APR_USE_SYSVSEM_SERIALIZE
>  -D APR_USE_PTHREAD_SERIALIZE
>  -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
>  -D APR_HAS_OTHER_CHILD
>  -D AP_HAVE_RELIABLE_PIPED_LOGS
>  -D DYNAMIC_MODULE_LIMIT=128
>  -D HTTPD_ROOT="/usr/local/apache2"
>  -D SUEXEC_BIN="/usr/local/apache2/bin/suexec"
>  -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
>  -D DEFAULT_ERRORLOG="logs/error_log"
>  -D AP_TYPES_CONFIG_FILE="conf/mime.types"
>  -D SERVER_CONFIG_FILE="conf/httpd.conf"
> 
> 
> I have a custom module(mod_XXXX.so) and oracle weblogic apache
> plugin(mod_wl_22.so) loaded via LoadModule directive into apache. 
> 
> The load that is being tested is 2500 req/second. 
> 
> Under this load apache continues to run for 2-3 days but suddnely stops
> responding.  Has been happening consistently. 
> Once this condition occurs apache stops serving even static pages exa:
> index.html or does not display server-status(mod_status).
> 
> And the only way to recover is to restart the server. 
> 
> The errors that I see in the error log are the following ones, which
> keep showing up frequently of which the first one when the weblogic
> server refuses connections dues to overload condition.
> 
> *1.* [Tue Sep 20 08:15:11 2011] [error] [client 135.115.142.108]
> ap_proxy: trying POST /cwmp-allow/cwmpWeb/CPEMgt at backend host
> '64.186.185.155/7003; got exception 'CONNECTION_REFUSED [os error=0,
> line 1715 of ../nsapi/URL.cpp]: Error connecting to host
> 64.186.185.155:7003'
> *2.* [Tue Sep 20 08:15:12 2011] [error] [client 135.115.142.100]
> *(34)Numerical result out of range: *mod_XXXX: XXXX_throttle_handler():
> failed to release the mutex lock
> 
> Had a look at the errno of apr and *(34)Numerical result out of range
> *doesn't seem to be coming from APR. 
> 
> Has some come across such a issue? Any kind of help/advice will really
> helpfull. 

Use gstack or similar against the hangingApache processes to inspect
what they are doing. My guess: since your modules logs "failed to
release the mutex lock", the worker threads micht block in trying to
acquire the unreleased lock.

Regards,

Rainer

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