[Pkg-net-snmp-devel] Bug#421906: memory leaks with snmpd on i686/vserver

[Progfou]

Package: snmpd
Version: 5.2.3-7
Severity: important


(This bug may be related to #420876, but the subject is different
 and I don't know how to change it or link them together.)

The snmpd service leaks memory to finaly get killed (!) by the memory
manager. It's perfectly reproducible on my server (firewall actually).

I restarted the snmpd service once again this morning and here was
it's status just after starting:

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
snmp     22460  1.1  6.5   6916  4084 ?        S    11:40   0:00 /usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid

And this is it's status now, about 7 hours later:

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
snmp     22460  0.1 16.8  14620 10456 ?        S    11:40   0:47 /usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid

This snmpd is running a very simple configuration, only to serve MRTG.
There is no call to external programs or trap management either.

The memory is growing by a few 10th kilobytes on every single request.

I did strace it but I was not able to find anything clearly wrong.

The only clue I have found is that we can clearly see the heap
allocation growing in "/proc/$(pidof snmpd)/smaps".

Hope this helps, cheers, J.C.

-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (990, 'stable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-4-vserver-686
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

Versions of packages snmpd depends on:
ii  adduser                     3.102        Add and remove users and groups
ii  debconf                     1.5.11       Debian configuration management sy
ii  libc6                       2.3.6.ds1-13 GNU C Library: Shared libraries
ii  libsensors3                 1:2.10.1-3   library to read temperature/voltag
ii  libsnmp9                    5.2.3-7      NET SNMP (Simple Network Managemen
ii  libwrap0                    7.6.dbs-13   Wietse Venema's TCP wrappers libra

snmpd recommends no packages.

-- debconf information:
* snmpd/upgradefrom521:
  snmpd/upgradefrom36: