[X2Go-User] X2Go server, nxagent causes segfault

Norman Gaywood ngaywood at une.edu.au
Tue Mar 13 05:43:05 CET 2018


I've got several users reporting seg faults in nxagent

Mine occur when moving my x2goclient window from one screen to another.
Simple resizing seems OK.

Not sure if this is the same for all my users though.

Seems to be happening after these updates:

nxproxy-3.5.99.15-0.0build1.1.git20180308.2971.main.fc27.x86_64 Mon 12 Mar
2018 09:14:38 AEDT
nxagent-3.5.99.15-0.0build1.1.git20180308.2971.main.fc27.x86_64 Mon 12 Mar
2018 09:14:38 AEDT
libXcompshad3-3.5.99.15-0.0build1.1.git20180308.2971.main.fc27.x86_64 Mon
12 Mar 2018 09:14:37 AEDT
libXcomp3-3.5.99.15-0.0build1.1.git20180308.2971.main.fc27.x86_64 Mon 12
Mar 2018 09:14:36 AEDT
libNX_X11-6-3.5.99.15-0.0build1.1.git20180308.2971.main.fc27.x86_64 Mon 12
Mar 2018 09:14:36 AEDT
nx-libs-3.5.99.15-0.0build1.1.git20180308.2971.main.fc27.x86_64 Mon 12 Mar
2018 09:14:35 AEDT

It does not seem to be possible to roll back.



On Tue, 13 Mar 2018 at 15:02, Norman Gaywood <ngaywood at une.edu.au> wrote:

> I'm thinking it may be the latest update to libNX_X11 (a few days ago)
>
> But the x2go repo does not contain old versions, so I can't test the
> downgrade.
>
> Anyone know how to downgrade?
> rpm -q libNX_X11-6
> libNX_X11-6-3.5.99.15-0.0build1.1.git20180308.2971.main.fc27.x86_64
>
> dnf downgrade libNX_X11-6
> Last metadata expiration check: 0:00:00 ago on Tue 13 Mar 2018 15:01:38
> AEDT.
> Package libNX_X11-6 of lowest version already installed, cannot downgrade
> it.
> Error: No packages marked for downgrade.
>
>
>
>
> On Tue, 13 Mar 2018 at 14:44, Norman Gaywood <ngaywood at une.edu.au> wrote:
>
>> I'm getting this on Fedora 27 (XFCE) as well.
>>
>> x2goserver-4.1.0.0-0.0x2go1.1.git20180302.1517.main.fc27.x86_64
>>
>> I notice that if you don't resize or move the x2go client window it stays
>> stable (does not segfault).
>>
>>
>> On Mon, 12 Mar 2018 at 22:35, Kalle Tuulos <kalle at tuulos.net> wrote:
>>
>>> Hello
>>>
>>> I'm using X2Go server in several computers, all running Ubuntu. Just
>>> today, one of my computers (headless Linux box) just froze and I had to
>>> give it a power cycle reset. After powering up again, I can't any more
>>> connect to X2Go.
>>>
>>> I'm getting following into /var/log/syslog:
>>> ---8<---8<---
>>> Mar 12 13:15:40 kallebuntu systemd[1]: Started Session 10 of user
>>> ktuulos.
>>> Mar 12 13:15:49 kallebuntu /usr/sbin/x2gocleansessions[1091]:
>>> ktuulos-50-1520853345_stDLXDE_dp32: state file for this session does not
>>> exist: /tmp/.x2go-ktuulos/C-ktuulos-50-1520853345_stDLXDE_dp32/state (this
>>> can be ignored during session startups)
>>> Mar 12 13:15:51 kallebuntu /usr/bin/x2gostartagent: successfully started
>>> X2Go Agent session with ID ktuulos-50-1520853345_stDLXDE_dp32
>>> Mar 12 13:15:58 kallebuntu kernel: [ 1315.845394] nxagent[9647]:
>>> segfault at 8 ip 000056286f70db3a sp 00007ffea2bd1bc0 error 4 in
>>> nxagent[56286f693000+432000]
>>> Mar 12 13:16:04 kallebuntu /usr/bin/x2gosetkeyboard: Setting X keyboard
>>> according to
>>> /home/ktuulos/.x2go/C-ktuulos-50-1520853345_stDLXDE_dp32/keyboard
>>> Mar 12 13:16:05 kallebuntu /usr/bin/x2goruncommand: launching session
>>> with Xsession-x2go mechanism, using STARTUP="startlxde"
>>> Mar 12 13:16:05 kallebuntu /usr/bin/x2goruncommand: dbus wrapper
>>> available as /usr/bin/dbus-run-session
>>> ---8<---8<---
>>>
>>> This computer is running Ubuntu 16.04. X2go server has been installed
>>> using the ppa method.
>>> ---8<---8<---
>>> ktuulos at kallebuntu:~$ uname -a
>>> Linux kallebuntu 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16
>>> 23:25:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
>>> ktuulos at kallebuntu:~$ dpkg -s x2goserver | grep Version
>>> Version: 4.1.0.0-0~1517~ubuntu16.04.1
>>> ktuulos at kallebuntu:~$ cat
>>> /etc/apt/sources.list.d/x2go-ubuntu-stable-xenial.list
>>> deb http://ppa.launchpad.net/x2go/stable/ubuntu xenial main
>>> # deb-src http://ppa.launchpad.net/x2go/stable/ubuntu xenial main
>>> ---8<---8<---
>>>
>>> There seem to be no hardware problems - I installed mcelog and I'm now
>>> monitoring its output. Nothing.
>>>
>>> Could anyone give some hints? I have spent the last hour googling about
>>> "nxagent segfault", but I haven't found anything, which would help.
>>>
>>> Thanks,
>>>   Kalle
>>>
>>> _______________________________________________
>>> x2go-user mailing list
>>> x2go-user at lists.x2go.org
>>> https://lists.x2go.org/listinfo/x2go-user
>>
>>
>>
>> --
>> Norman Gaywood, Computer Systems Officer
>> School of Science and Technology
>> University of New England
>> Armidale NSW 2351, Australia
>>
>> ngaywood at une.edu.au  http://turing.une.edu.au/~ngaywood
>> Phone: +61 (0)2 6773 2412  Mobile: +61 (0)4 7862 0062
>>
>> Please avoid sending me Word or Power Point attachments.
>> See http://www.gnu.org/philosophy/no-word-attachments.html
>>
>
>
> --
> Norman Gaywood, Computer Systems Officer
> School of Science and Technology
> University of New England
> Armidale NSW 2351, Australia
>
> ngaywood at une.edu.au  http://turing.une.edu.au/~ngaywood
> Phone: +61 (0)2 6773 2412  Mobile: +61 (0)4 7862 0062
>
> Please avoid sending me Word or Power Point attachments.
> See http://www.gnu.org/philosophy/no-word-attachments.html
>


-- 
Norman Gaywood, Computer Systems Officer
School of Science and Technology
University of New England
Armidale NSW 2351, Australia

ngaywood at une.edu.au  http://turing.une.edu.au/~ngaywood
Phone: +61 (0)2 6773 2412  Mobile: +61 (0)4 7862 0062

Please avoid sending me Word or Power Point attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html
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