Re: snmpd agent crashing after SIGHUP sent

Brendan Simon <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
Dave Shield wrote:
> On 17/04/2008, Brendan Simon <[email protected]> wrote:
>   
>> I have an net-snmp agent (5.2.2) that crashes (segfault) when sending a
>>  sighup to the agent, followed by an snmp access (eg. snmpget).
>>     
>>  My colleague says it is something to do with registering and
>>  unregistering the mibs and function pointers pointing to old memory
>>  allocations, or something like that.
>>
>>  Any help to solve this would be welcomed.
>>     
>
> The first thing is to pinpoint exactly where the crash is happening,
> and what is causing it.   Try running the agent under a debugger,
> and trigger the crash - what does a backtrace show?   What does
> the code look like at the point where the agent crashed?
>
> See http://www.net-snmp.org/wiki/index.php/Debugger
> for details.
>   

I believe it as to do with registering the MIBs more than once.  My 
colleague has been able to resolve this by unregistering the MIBs 
"properly".  I say properly because they were being unregistered but I 
don't think it was being done the right way.  At least the new way 
certainly doesn't cause the crash.

Are there any detailed examples on how to unregister MIBS "properly" ???
I saw some quick tutorial for registering but I don't recall seeing much 
info on the unregistering side of things.  I will keep looking.

Thanks, Brendan.






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