[X2Go-User] Every connect from Ubuntu 18.04 client gives core dump
Kees Bakker
keesb at ghs.com
Fri Oct 11 10:21:35 CEST 2019
Bingo !!! Thanks Михайло.
That's it. Disabling ProxyCommand in /etc/ssh/ssh_config allows me
to get a remote session.
The FreeIPA installation puts these lines in /etc/ssh/ssh_config
GlobalKnownHostsFile /var/lib/sss/pubconf/known_hosts
PubkeyAuthentication yes
ProxyCommand /usr/bin/sss_ssh_knownhostsproxy -p %p %h
Just disabling ProxyCommand is enough.
Of course it is not nice that you get a core dump when ProxyCommand
is present. That's a bug for sure (in x2go and/or in libssh.so).
-- Kees
On 10-10-19 21:36, Михайло Падалка wrote:
> **** EXTERNAL E-MAIL ****
>
> AFAIK FreeIPA modifies client SSH config when joining domain, particularly sets ProxyCommand (to pull SSH fingerprints from server), and maybe some other options.
>
> Maybe that changes are causing problem with X2GO.
>
> Ср, 9 жовт. 2019, 10:21 користувач Kees Bakker <keesb at ghs.com <mailto:keesb at ghs.com>> пише:
>
> On 08-10-19 14:17, Stefan Baur wrote:
> > Am 08.10.19 um 13:57 schrieb Kees Bakker:
> >> I already tried that with another system.
> >> Same result: core dumped.
> > In that case, I would like to ask you to do fresh installs of Ubuntu
> > 18.04 with X2GoServer and X2GoClient somewhere (say, two virtual
> > machines), that aren't joined to your FreeIPA environment. Just two
> > plain and simple basic installations. If it works there, then it's
> > likely to be an issue with your particular setup.
> Two virtual machines (with a reasonable fresh install) don't
> give the problem. I haven't completed the whole test because I
> needed to install LXDE, or MATE.
> Most important conclusion is that the connection worked well.
> No segfault.
>
> >
> > Also, did you try if using a different session type makes a difference?
> > Say, a Desktop session of XFCE or MATE, or a single application
> > LibreOffice session, ...
> > Given your error message, it seems unlikely, but it's a quick check
> > compared to the effort two new installs require.
>
> I tried various desktops, all gave the "core dumped" message.
>
> Can we draw the conclusion that it is the SSH connection?
> How can I investigate this further? One thing I already tried was
> to run the remote sshd in debug. I noticed that it uses different
> connection methods between normal ssh and x2go.
> --
> Kees
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