[Bug 1821255] Re: Restart policy "Always" doesn't work under certain circumstances

[Steve Langasek]

We triaged this to the fact that ExecStop runs a command that tries to
talk to iscsid, and iscsid is socket-activated on Ubuntu, so the command
hangs while trying to talk to a socket that systemd is waiting to
dispatch to the iscsid service that is in the process of being stopped.

>From reading the manpage on iscsiadm, we should just omit the ExecStop
command in favor of using the default semantics of KillSignal=SIGTERM.

** Changed in: open-iscsi (Ubuntu)
   Importance: Undecided => High

** Changed in: open-iscsi (Ubuntu)
       Status: New => Triaged

** Also affects: open-iscsi (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: open-iscsi (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: open-iscsi (Ubuntu Bionic)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1821255

Title:
  Restart policy "Always" doesn't work under certain circumstances

Status in open-iscsi package in Ubuntu:
  Triaged
Status in open-iscsi source package in Bionic:
  Triaged

Bug description:
  Iscsid restart fails when killed with a SIGTERM.

  Conditions:
  Iscsid restart policy set to "Always" via a .conf file in /etc/systemd/system/iscsid.service.d/, with the contents:
  [Service]
  Restart=always

  Steps to Reproduce:
  1. Confirm iscsid is running, e.g.
  $ ps aux | grep iscsid
  or
  $ pgrep iscsid

  2. Kill the pid(s) with SIGTERM, e.g.
  $ sudo kill -15 <pid>
  or
  $ sudo pkill iscsid

  3. Confirm that iscsid has not restarted
  $ systemctl status iscsid

  This bug affects 18.04, but not 16.04. This hasn't been tested on
  18.10 or later.

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