[Bug 2011458] Re: ssh fails to rebind when it is killed with -HUP

[Nick Rosbrook]

This is related to the systemd socket activation patch we have in
openssh, and specifically that it does not correctly handle the re-
execution logic of sshd. I am working on a fix for this.

** Changed in: openssh (Ubuntu)
       Status: New => Triaged

** Changed in: openssh (Ubuntu)
   Importance: Undecided => Medium

** Changed in: openssh (Ubuntu)
     Assignee: (unassigned) => Nick Rosbrook (enr0n)

** Also affects: openssh (Ubuntu Kinetic)
   Importance: Undecided
       Status: New

** Changed in: openssh (Ubuntu Kinetic)
       Status: New => Triaged

** Changed in: openssh (Ubuntu Kinetic)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/2011458

Title:
  ssh fails to rebind when it is killed with -HUP

Status in openssh package in Ubuntu:
  Triaged
Status in openssh source package in Kinetic:
  Triaged

Bug description:
  In kinetic and lunar gce images we are facing an issue when ssh is being killed with -HUP
  SSH is failing to rebind port 22. It is not failing in other previous systems. 

  It can be reproduced by running

  
  # pkill -o -HUP sshd || true
  # journalctl -n 20
  Mar 13 14:58:52 mar131454-025105 sshd[1371]: Received SIGHUP; restarting.
  Mar 13 14:58:52 mar131454-025105 sshd[1371]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
  Mar 13 14:58:52 mar131454-025105 sshd[1371]: error: Bind to port 22 on :: failed: Address already in use.
  Mar 13 14:58:52 mar131454-025105 sshd[1371]: fatal: Cannot bind any address.
  Mar 13 14:58:52 mar131454-025105 systemd[1]: ssh.service: Main process exited, code=exited, status=255/EXCEPTION
  Mar 13 14:58:52 mar131454-025105 systemd[1]: ssh.service: Failed with result 'exit-code'.

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