Package: snmpd Version: 5.9+dfsg-4+deb11u1 Severity: important Dear Maintainer,
We have come across multiple situations in which snmpd would seemingly randomly crash on a large number of production systems, whereas only Debian 11 is affected. The root cause of this seems to be a race condition that is triggered when a network interface disappears during its processing. While this case may sound unlikely we have seen frequent crashes on systems running (short-lived) docker containers, which get veth network interfaces added and removed in short time frames. It turns out that this issue is known upstream ([0]) and fixed in 5.9.3 as available from Debian testing. A backport of net-snmp 5.9.3 to bullseye without any further adjustments fixed the issue for us and we have since been unable to reproduce the issue. -- System Information: Debian Release: 11.5 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable') Architecture: amd64 (x86_64) [0] https://github.com/net-snmp/net-snmp/issues/107
