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

[Sergio Cazzolato]

Public bug reported:

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'.

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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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