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From Tom Evans <tevans...@googlemail.com>
Subject Re: [users@httpd] Apache freezes after running for 2 days.
Date Tue, 27 Sep 2011 11:16:32 GMT
On Mon, Sep 26, 2011 at 10:35 PM, Abhi Auradkar <aurabhi@yahoo.com> wrote:
> Hi All,
>
> 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.

errno 34 is ERANGE. Your custom module is trying to parse a number
from a string, probably strtol() or variant, and fails. It then
reports a problem releasing a mutex, and your entire server locks up.
I'd suggest these things are not unrelated.

Given that the failing code is in your custom module, I guess you are
on your own. The proxy error comes from mod_wl_22; you should contact
Oracle to resolve that.

Cheers

Tom

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