Nagios causing signal 11 on apache.

[Marc Powell]

Tim Uckun <mailto:tim at diligence.com> wrote:
>> The nagios daemon (the bit that's doing the actual service checking,
>> as opposed to the web page generating CGI stuff) doesn't have
>> *anything* to do with the web server, so it seems... unlikely that it
>> directly could cause Apache threads to die.
> 
> Ooops it seems like I was misunderstood.
> 
> What is happening is that nagios is running on machine A checking
> https and http service on machine B. The signal 11s are happening on
> machine B.  
> 
> In other words when nagios checks the web server apache (the machine
> being 
> checked) throws a signal 11.
> 
> Just like sshd throws error messages into syslog when nagios checks
> to see if sshd is running. 


That's making a little more sense now but I still agree with the
previous poster that it's probably not nagios _causing_ the problem but
more likely that it's excacerbating an already existing problem.
Assuming you're using check_http, there isn't anything that it does that
a normal browser wouldn't/couldn't do. What commands, exactly, are you
using to check your web server (i.e. what are the full command
definitions)? Have you correlated the sig 11's to the http or https
checks yet? That would be a key piece of information. Have you tried
making the same request from a browser to see if it has the same effect?
I seem to remember reading some posts elsewhere about people having
problems with apache+openSSL segfaulting. A quick google search for
'apache signal 11' or 'apache signal 11 https' bring up a lot of hits
like
http://216.239.51.104/search?q=cache:bLrGusXwg3EJ:lists.freebsd.org/pipe
rmail/freebsd-isp/2003-April/000063.html+apache+signal+11&hl=en&ie=UTF-8
. Have any changes been made on the web server? New libraries installed
or old libraries removed? PHP upgraded? Anything like that? Has apache
been restarted since this started?

--
Marc


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