I tried running "top" while servicing SNMPv3 "get" requests. Results:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3585 root 20 0 13168 2988 1008 S 0.0 0.1 0:00.05 snmpd
3585 root 20 0 13168 2988 1008 S 0.0 0.1 0:00.05 snmpd
3585 root 20 0 13168 2988 1008 S 0.0 0.1 0:00.05 snmpd
3585 root 20 0 13168 3220 1240 S 0.3 0.2 0:00.06 snmpd
3585 root 20 0 13168 3220 1240 S 0.3 0.2 0:00.07 snmpd
3585 root 20 0 13168 3220 1240 S 0.0 0.2 0:00.07 snmpd
...
3585 root 20 0 13168 3220 1240 S 0.0 0.2 0:00.18 snmpd
3585 root 20 0 13168 3220 1240 S 0.0 0.2 0:00.18 snmpd
3585 root 20 0 13168 3220 1240 S 0.0 0.2 0:00.18 snmpd
3585 root 20 0 13168 3224 1244 S 0.0 0.2 0:00.18 snmpd
3585 root 20 0 13168 3224 1244 S 0.3 0.2 0:00.19 snmpd
3585 root 20 0 13168 3224 1244 S 0.3 0.2 0:00.20 snmpd
The first jump of memory usage was when I first started querying the agent
with a given SNMPv3 user. The second, smaller jump happened when I
switched to querying an object served by a subagent. This is many
queries/second, so it seems like the leak is at least not per-request.
I haven't had a chance to run valgrind to see what it thinks. Have you
found a way to cause multiple leaks?
Bill
On Tue, Jul 8, 2014 at 2:19 PM, Sean Burke <sean.bu...@pacbell.net> wrote:
> I've observed the leak with GET and v3 AuthNoPriv. I believe
> that GET-NEXT and GET-BULK would show the problem also.
> I am running an agent session that receives these requests.
>
> -SEan
>
>
>
> On Jul 8, 2014, at 11:10 AM, Bill Fenner wrote:
>
> On Tue, Jun 24, 2014 at 3:47 AM, Sean Burke <sean.bu...@pacbell.net>
> wrote:
>
>> Hi All,
>>
>> I am writing to ask about this code in 5.7.2.1 snmp_api.c at line 5423.
>> I am specifically concerned with the constraint pdu->command ==
>> SNMP_MSG_TRAP2,
>> which appears to interfere with freeing the securityStateRef for request
>> command
>> types, e.g. GET, SET, GET-NEXT, GET-BULK.
>>
>> Testing with valgrind indicates that removing the pdu-command constraint
>> fixes a leak.
>> Is this an error, or is there a rationale that I do not understand?
>>
>> Thanks,
>> -SEan
>>
>> /*
>>
>>
>>
>>
>> * Call USM to free any securityStateRef supplied with the message.
>>
>>
>>
>>
>> */
>> if (pdu != NULL && pdu->securityStateRef &&
>> pdu->command == SNMP_MSG_TRAP2) {
>> sptr = find_sec_mod(pdu->securityModel);
>> if (sptr) {
>> if (sptr->pdu_free_state_ref) {
>> (*sptr->pdu_free_state_ref) (pdu->securityStateRef);
>> } else {
>> snmp_log(LOG_ERR,
>> "Security Model %d can't free state references\n",
>> pdu->securityModel);
>> }
>> } else {
>> snmp_log(LOG_ERR,
>> "Can't find security model to free ptr: %d\n",
>> pdu->securityModel);
>> }
>> pdu->securityStateRef = NULL;
>> }
>>
>>
> Can you say what operation you perform to cause this leak? (E.g.,
> authPriv SNMPv3 GET?)
>
> Bill
>
>
>
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