[AGENT++] Core dump related to rows being removed from agentX tables?

[Frank Fock]

Hi John,

How do you remove the rows from the table?
Are you calling lock_mib() and table->start_synch()
before removing the rows?

Best regards,
Frank

john.edmonds at bt.com wrote:
> Hi,
>  
> I have a setup that works most of the time, but occasionally core dumps (under linux on PPC).  I suspect that it is somehow related to removing rows from tables (or multiple rows), when I don't remove table rows I never seem to get core dumps.  I am running an AgentX++ sub agent with Net-SNMP 5.4.1 master agent.
>  
> agent++ v3.5.27.b
> agentX++ v1.4.15
> snmp++ v3.2.21.a
>  
> This a stack backtrace I got from one core dump, the crash occurs at #0, List.h line 1154. Looks like a "get_next"...
>  
> #7 thread_starter () at threads.cpp:486
> #6 Agentpp::TaskManager::run () at threads.cpp:742
> #5 Agentpp::MibTask::run () at threads.cpp:920
> #4 Agentpp::SubAgentXMib::do_process_request () at agentx_subagent.cpp:926
> #3 Agentpp::Mib::process_request () at mib.cpp:3297
> #2 Agentpp::SubAgentXMib::find_next () at agentx_subagent.cpp:1072
> #1 Agentpp::MibTable::find_succ () at mib.cpp:1753
> #0 Agentpp::MibTable::find_next () at List.h:1154
>  
> I have a MIB Browser that is constantly refreshing the display of the Tables.  Could there be a missing mutex somewhere between table row updates and browser SNMP gets perhaps?  Or confusion between a get on one table and row removal on another?
>  
> Any suggestions as to what might be happening or what I could do to patch code to stop core dumps?  Add some bounds checking?
>  
> Best regards,
> John Edmonds (BT)
>  
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