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Re: Process kill on logout

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On 26 Jun 2017, Alan wrote:

> I have just upgraded from Jessie to Stretch and my arrangement where
> I logout and then mythtv shuts my computer down and sets a wakeup
> time just before the next recording time has stopped working.

I have no help to offer regarding mythtv, or your shutdown/wakeup
scheme.

I'm interested in your GNU screen problems, though:

> In the past when that happens I have set up "screen", and entered an
> used "sleep 1m && who -u" to find out why its not detecting me as
> logged out.  I set that command running, detach from screen, logout,
> ensure the minute is up, log back in and re-enter my screen session
> to see what it made of things.
>
> That no longer works.

So, just to be sure we are on the same page, you do all of the above
as userjoe and then, after waiting 60 seconds and logging back in
again as userjoe,

  $ screen -ls

tells you that there are no sockets in /run/screen/S-userjoe ?

> It appears that systemd now kills off all processess associated with
> the user - or rather I found a bug report that said that had
> happened about a year ago as the default had changed.

You are refering to one of these bug reports, I guess, which were
marked fixed in version systemd/230-2 ?

  #825941 - screen is killed by systemd when the user logs out
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=825941

  #825394 - systemd kill background processes after user logs out
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=825394

I have upgraded a minimal jessie install to stretch, and installed GNU
screen after the upgrade, and I am unable to replicate the breakage. I
log out, and my detached screen sessions survive.

It would be interesting to know what makes the difference.

What output do you get for the following four commands? (I include
output from my own system here for comparison.)

  $ systemd --version
  systemd 232
  +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
  +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID
  +ELFUTILS +KMOD +IDN

  $ screen -v
  Screen version 4.05.00 (GNU) 10-Dec-16

  $ uname -a
  Linux magicbucket 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u2 (2017-06-26) x86_64 GNU/Linux

  $ grep '^[^#]' /etc/apt/sources.list{,.d/*}

  /etc/apt/sources.list:deb http://debian.univ-lorraine.fr/debian/ stretch main
  /etc/apt/sources.list:deb-src http://debian.univ-lorraine.fr/debian/ stretch main
  /etc/apt/sources.list:deb http://security.debian.org/ stretch/updates main
  /etc/apt/sources.list:deb-src http://security.debian.org/ stretch/updates main
  /etc/apt/sources.list:deb http://debian.univ-lorraine.fr/debian/ stable-updates main
  /etc/apt/sources.list:deb-src http://debian.univ-lorraine.fr/debian/ stable-updates main
  grep: /etc/apt/sources.list.d/*: No such file or directory

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Process kill on logout Alan Chandler <alan@chandlerfamily.org.uk> - 2017-06-26 08:00 +0200
  Re: Process kill on logout davidson@freevolt.org - 2017-07-01 03:30 +0200

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