Help with net-snmp memory leak

R

roscoe

I am currently running net-snmp-5.4.2.1_6 with cacti-0.8.7e4 for remote monitoring of my server.

Since upgrading to FreeBSD 8.0-RELEASE I have noticed a memory leak issue with net-snmp. Maybe it was there with 7.2-RELEASE, I am not sure.

I currently have Cacti set up with a 5 minute polling cycle where some SNMP MIBs are polled (i.e. ethernet traffic usage, CPU usage, etc.)

Memory leak issue: after each poll, snmpd uses up four additional kilobytes. Each day, it consumes about one additional megabyte. If I restart snmpd, memory usage goes back down to normal (about 5,000 kilobytes).

Any ideas on how to fix this? I can also replicate this in a virtual machine running 8.0-RELEASEp2 (vmware workstation).

Thanks!
 
As a further update, the snmpd process running on its own (with no SNMP polling or Cacti running) seems to eat up memory anyways.
 
I have been seeing as similar leak on FreeBSD 7.3 with net-snmp-5.5_4, only it's eating up /var rather than real memory. I'm also using cacti-0.8.7g, but as you say, it doesn't seem that Cacti is the issue.

Code: 
# lsof -p <pid of snmpd>
...
snmpd   48564 root    3w  VREG       0,79 364942730  165266 /var (/dev/mirror/gm0s1d)
...

Restarting snmpd does the trick every time. Mine's been going on since at least July, when I first noticed it. I keep my ports up to date religiously.
 
The changelog mentions "Fix various memory leaks". You could file a PR to get net-snmp updated to version 5.6, hopefully those fixes will be included in that version.
 
Thanks for pointing that out. I'm a bit embarrassed now, as I updated net-snmp last week, but you made me realize I hadn't restarted snmpd since, so 5.5 may very well have fixed my issue! I will follow up in a few days...
 
Nope, still leaking...
Code: 
# lsof -p <pid of snmpd>
...
snmpd   43652 root    3w  VREG       0,79 40909387  165333 /var (/dev/mirror/gm0s1d)
...
 
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