Confd is crashing with "Internal error: Supervision terminated"

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1

Hi, we are using confd 6.7. Recently we have been seeing numerous authenticationFailure traps not being sent and the following message being printed to stdout.

Confd finally crashes with **"Internal error: Supervision terminated"**

**STDOUT** (logs are very frequent, more than one per second)
** [2021:01:15 00:23:36 437] SNMP MASTER-AGENT INFO ***
   Trap not sent:
   {system_limit,
       [{erlang,spawn_link,
            [proc_lib,init_p,
             [snmp_master_agent,
              [snmpa_agent_sup,snmpa_supervisor,snmp_app_sup,<0.2132.0>],
              snmpa_agent,do_send_trap,
              [{notification,authenticationFailure,
                   [1,3,6,1,6,3,1,1,5,5],
                   [],undefined},
               [],[],no_receiver,[],
               [{'$ancestors',
                    [snmpa_agent_sup,snmpa_supervisor,snmp_app_sup,
                     <0.2132.0>]},
                {mibserver,<0.2164.0>},
                {net_if,<0.2163.0>},
                {net_if_data,undefined},
                {snmp_context,undefined},
                {snmp_community,undefined},
                {snmp_request_id,undefined},
                {sname,ma},
                {set_module,confd_snmpa_set},
                {'__nslist',
                [...]
                {auth_module,snmpa_acm},
                {verbosity,info},
                {'$initial_call',{snmpa_agent,init,1}}],
               undefined]]],
            []},
        {proc_lib,spawn_link,3,[{file,"proc_lib.erl"},{line,93}]},
        {snmpa_agent,do_handle_send_trap,7,
            [{file,"snmpa_agent.erl"},{line,1927}]},
        {snmpa_agent,handle_call,3,[{file,"snmpa_agent.erl"},{line,917}]},
        {gen_server,try_handle_call,4,[{file,"gen_server.erl"},{line,645}]},
        {gen_server,handle_msg,5,[{file,"gen_server.erl"},{line,677}]},
        {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,240}]}]}

**STDOUT : CONFD CRASHED**
connection refused (debug_dump)
"Internal error: Supervision terminated\n"^M
"Internal error: Component terminated (application_controller) ({application_terminated,capi,shutdown})\n"^M

**DEVEL LOG**
devel-snmpa *encryption error: priv protocol*: 1.3.6.1.6.3.10.1.2.4
2

That looks like a resource leak to me. Are you able to throttle the amount of traps to be sent to check if the system is able to recover/release the resources when it is given some more time?

Btw. when you write that you are using confd-6.7, does it mean 6.7.x or really 6.7? The revision 6.7 is a bit dated already.

3

The issue was seen on all confd versions (eg 6.7, 7.3.2 etc)
Is there a reason why we are seeing “encryption error: priv protocol” ?

I’m not sure about trap throttling. We have setup an snmp trap target that takes v2 traps.

I’ve noticed that when snmpagent restarts confd crashes with Internal Error : Supervision Terminated.

The snmpagent can restart on changing snmp version, localengineid etc

4

Hi,

Any update on why we are seeing “encryption error: priv protocol” ?

(also correction in above message, we are sending v3 traps to the target with authPriv security level)

Thanks

5

There is not much that can fail during aes_encrypt, so I would assume this error is a consequence of other problems.