/usr/sbin/openvpn:*** Error in `/usr/sbin/openvpn': corrupted double-linked list: ADDR ***

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding openvpn. This problem was most recently seen with version 2.3.4-5ubuntu1, the problem page at https://errors.ubuntu.com/problem/1f088343c0831fdc775480dffdca886cd166b472 contains more details.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Paul Crawford (psc-sat)]

I am seeing this occasionally, today when disconnecting from a hung VPN session. I was seeing message such as:

nm-openvpn[1832]: RESOLVE: Cannot resolve host address: <redacted>: Temporary failure in name resolution

In syslog which may, or may not, be related to the resulting crash.

It might also be related to Bug #1406220 as the apport collected file shows the message also came from the malloc() call, but maybe the error reporting text has changed with libc updates?

[Paul Crawford (psc-sat)]

Forgot to add the system details:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty

$ apt-cache policy openvpn
openvpn:
  Installed: 2.3.2-7ubuntu3.1
  Candidate: 2.3.2-7ubuntu3.1
  Version table:
 *** 2.3.2-7ubuntu3.1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2.3.2-7ubuntu3 0
        500 http://gb.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages