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@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@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@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@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@kallebuntu:~$ dpkg -s x2goserver | grep Version

Version: 4.1.0.0-0~1517~ubuntu16.04.1

ktuulos@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

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--

Norman Gaywood, Computer Systems Officer

School of Science and Technology
University of New England

Armidale NSW 2351, Australia

ngaywood@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@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