I tried running top while servicing SNMPv3 get requests. Results:
PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ 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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