OpenSMTPD crashes after upgrade to 18.04.1 LTS

[Pavneet Arora]

I had a stable 16.04 server running OpenSMTPD. Recently upgraded to 18.04.1 LTS, and smtpd would crash repeatedly with each outbound email attempt.

Logged this as an issue on github.com/OpenSMTPD/OpenSMTPD. After a great deal of assisted investigation, the problem was traced to crypt_checkpass.c for which a patch has already been made and merged back into the main branch.

In order to get back into production I have used the package source and replaced crypt_checkpass.c with the updated one. The full recipe for getting our server back into production may be found here:

https://github.com/OpenSMTPD/OpenSMTPD/issues/888#issuecomment-436686749

I would classify this as *URGENT* as it renders mail servers using OpenSMTPD on the latest stable unusable.

# lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04

# apt-cache policy opensmtpd
opensmtpd:
  Installed: 6.0.3p1-1build1
  Candidate: 6.0.3p1-1build1
  Version table:
 *** 6.0.3p1-1build1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

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