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I don't really understand what you expect here. Agressive debug output from ssh?

So, I did look into the issue and there doesn't seem to be a problem with ssh actually. The failure looks like this:

https://openqa.suse.de/tests/1656222#step/boot_to_desktop/21

While if the xterm started, it looks like this:
https://openqa.suse.de/tests/1563415#step/boot_to_desktop/19

What you notice in the failed log:
[2018-05-01T08:50:09.0524 CEST] [debug] <<< testapi::select_console(testapi_console='root-console')
/usr/lib/os-autoinst/consoles/vnc_base.pm:71:{
'hostname' => 'localhost',
'port' => 35180,
'ikvm' => 0
}
IceWM: using /var/lib/empty/.icewm for private configuration files
11841
[2018-05-01T08:50:10.0777 CEST] [debug] activate_console, console: root-console, type: console
[2018-05-01T08:50:10.0777 CEST] [debug] backend s390x || zkvm
[2018-05-01T08:50:10.0778 CEST] [debug] /var/lib/openqa/cache/tests/sle/tests/boot/boot_to_desktop.pm:27 called opensusebasetest::wait_boot
[2018-05-01T08:50:10.0778 CEST] [debug] <<< testapi::assert_screen(mustmatch='password-prompt', timeout=30)
[2018-05-01T08:50:10.0833 CEST] [debug] MATCH(password-prompt-20141126:0.00)
[2018-05-01T08:50:10.0838 CEST] [info] Collected unknown process with pid 11841 and exit status: 0

Note that 11841 is the xterm/Xvnc pid - I don't know why it crashes/stops, but it has nothing to do with ssh

coolo wrote:

[…]
Note that 11841 is the xterm/Xvnc pid - I don't know why it crashes/stops, but it has nothing to do with ssh

Well, then I consider the "Xvnc has vanished" as part of the story.

Do the Acceptance criteria make sense to you?

Take a look into a standard test with "remote backend", e.g. default@s390x-kvm. Looking for select_console I see there blocks like

[2018-05-03T23:28:36.0547 CEST] [debug] <<< testapi::select_console(testapi_console='svirt', await_console=0)
[2018-05-03T23:28:36.0628 CEST] [debug] Connection to root@s390p8.suse.de established
/usr/lib/os-autoinst/consoles/vnc_base.pm:71:{
  'port' => 56100,

which is already helpful because we know that an ssh-connection is established. However we the part about VNC is not really clear to test reviewers. So I think one debug line could be helpful. And in case the ssh connection is not working it might be hard to understand who tried to connect to where (from where) and why so I suggest a debug line there as well that say something like "[debug] select_console 'svirt': Connecting from '' to ''". The related tickets show some examples, please see them as well. For example https://openqa.suse.de/tests/1536522#step/boot_to_desktop/20 is a case of a black screen and it is not obvious from the logs what is going wrong.

the ssh connections don't happen in backends - they happen in consoles

Well, but the ssh you're having problems with is running in an xterm and is assert_screened. The failed assert_screen is the feedback

From https://openqa.suse.de/tests/1677493/file/autoinst-log.txt

20564
[2018-05-09T11:59:16.0547 CEST] [debug] activate_console, console: root-console, type: console
[2018-05-09T11:59:16.0547 CEST] [debug] backend s390x || zkvm
[2018-05-09T11:59:16.0547 CEST] [debug] /var/lib/openqa/cache/tests/sle/tests/boot/boot_to_desktop.pm:27 called opensusebasetest::wait_boot
[2018-05-09T11:59:16.0548 CEST] [debug] <<< testapi::assert_screen(mustmatch='password-prompt', timeout=30)
[2018-05-09T11:59:16.0603 CEST] [debug] MATCH(password-prompt-20141126:0.00)
[2018-05-09T11:59:16.0616 CEST] [debug] MATCH(password-prompt-20150730:0.00)
[2018-05-09T11:59:16.0628 CEST] [info] Collected unknown process with pid 20564 and exit status: 0

But there is more in the journal:

May 09 11:58:24 openqaw2 worker[20496]: [info] Collected unknown process with pid 20318 and exit status: 1
May 09 11:58:24 openqaw2 worker[20496]: [info] Collected unknown process with pid 20320 and exit status: 84
May 09 11:58:24 openqaw2 worker[20496]: [info] Collected unknown process with pid 20322 and exit status: 13
May 09 11:58:24 openqaw2 worker[20496]: [info] Collected unknown process with pid 20325 and exit status: 0
May 09 11:58:24 openqaw2 worker[20496]: [info] Collected unknown process with pid 20326 and exit status: 255
May 09 11:59:16 openqaw2 worker[20496]: [info] Collected unknown process with pid 20564 and exit status: 0
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20562 and exit status: 1
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20292 and exit status: 0
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20441 and exit status: 1
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20535 and exit status: 0
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20446 and exit status: 84
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20455 and exit status: 0
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20443 and exit status: 84
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20456 and exit status: 255
May 09 11:59:48 openqaw2 worker[20496]: [info] Collected unknown process with pid 20401 and exit status: 0

the 84 are xterm's exit code for IO error - so they are easy to spot :)

This happens whenever we close the xvnc console. I guess we should take care of more processes within the consoles, so we know when they die before we want them to.

coolo wrote:

the 84 are xterm's exit code for IO error - so they are easy to spot :)

good to know

I guess we should take care of more processes within the consoles, so we know when they die before we want them to.

Yes, that would be great!