[Pkg-net-snmp-devel] Bug#856551: Error allocating more space for arpcache

[Israel G. Lugo]

Hello,

I can confirm this also on my GNU/Linux routers.

As Sven indicated, this has been fixed upstream in 2016-08-31:
https://sourceforge.net/p/net-snmp/bugs/2678/

The fix for this, kindly attached here by Sven from upstream, is
trivial. It changes only 2 lines, and does not change program behavior
in any way other than to fix broken memory management.

Please backport this to stable Debian Jessie. Network management
software such as Netdisco or Netdot relies on periodically retrieving
the ARP tables via SNMP for day to day management. With this bug, I'm
getting only a partial random view of the access network.

Regards,
Israel G. Lugo




On Thu, 02 Mar 2017 12:40:12 +0100 Sven Hartge <sven at svenhartge.de> wrote:
> Package: snmpd
> Version: 5.7.2.1+dfsg-1
> Severity: normal
> Tags: upstream patch
>
> Hi!
>
> On a system of mine where the neighbour table can get quite large, I
> often get the following error:
>
> ,----
> | Mar 2 10:57:26 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> | Mar 2 10:57:27 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> | Mar 2 10:57:28 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> | Mar 2 10:57:29 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> | Mar 2 10:57:30 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> | Mar 2 10:57:31 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> | Mar 2 10:57:32 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> | Mar 2 10:57:33 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> | Mar 2 10:57:34 firewall snmpd[5302]: Error allocating more space for
arpcache. Cache will continue to be limited to 1024 entries
> `----
>
> I tracked this down to bug 2678 on Sourceforge:
> https://sourceforge.net/p/net-snmp/bugs/2678/
>
> The fix is in commit d6e7f8962b110a2cd65667b2c57a8a60ad3cd222 in the
> upstream git, a patch is attached for your convenience.
>
> It would be very nice if this change can make it to Stretch before
> release. The fix is simple enough that the Release-Team should unblock
> the package.
>
> Grüße,
> Sven.