[X2Go-Dev] new version 4.1.1.0 from Mac still crashes to Fedora 26

[Robert Kudyba]

>
> > hostnamectl set-hostname fedora.local.home.ionic.de
> >
> > Then, I edited /etc/hosts and added:
> >
> > 192.168.122.128 fedora fedora.local.home.ionic.de
> >
> > This leads to exactly the problem you described.
> >
> >
> > If I change "fedora" to resolve to 127.0.0.1 instead (with
> > fedora.local.home.ionic.de staying on 192.168.122.128), I can connect
> via X2Go
> > again.
> >
> > Can you confirm this?
>

Just making this one change to the /etc/hosts file didn't change anything.
However when I used the hostnamectl command I was able to get the dialog
box asking me to continue or terminate what had to be 15 sessions. After
terminating them all I got the X2Go screen for about 3 seconds and then it
quit with the following segfault:

Nov 10 13:58:11 sobolev /usr/bin/x2goruncommand[2728]: dbus wrapper
available as /usr/bin/dbus-run-session
Nov 10 13:58:12 sobolev kernel: glxinfo[2769]: segfault at 0 ip
00007f31b6cc4627 sp 00007fffb61bc838 error 4 in
libX11-xcb.so.1.0.0[7f31b6cc4000+1000]
Nov 10 13:58:12 sobolev systemd[1]: Started Process Core Dump (PID 2773/UID
0).
Nov 10 13:58:12 sobolev systemd-coredump[2774]: Process 2769 (glxinfo) of
user 1000 dumped core.#012#012Stack trace of thread 2769:#012#0
0x00007f31b6cc4627 XGetXCBConnection (libX11-xcb.so.1)#012#1
0x00007f31b838eb46 __glXInitialize (libGLX_indirect.so.0)#012#2
0x00007f31b838a4a4 GetGLXPrivScreenConfig (libGLX_indirect.so.0)#012#3
0x00007f31b838b375 glXChooseVisual (libGLX_indirect.so.0)#012#4
0x000055f5cc3c2b6a main (glxinfo)#012#5  0x00007f31ba57b88a
__libc_start_main (libc.so.6)#012#6  0x000055f5cc3c32fa _start (glxinfo)
Nov 10 13:58:13 sobolev abrt-server[2836]: Deleting problem directory
ccpp-2017-11-10-13:58:12.853273-2769 (dup of
ccpp-2017-11-10-13:54:22.364670-28375)
Nov 10 13:58:13 sobolev abrt-notification[2946]: Process 28375 (glxinfo)
crashed in XGetXCBConnection()
Nov 10 13:58:13 sobolev kernel: mate-session[2731]: segfault at 0 ip
00007f3ffb453627 sp 00007ffeda962b68 error 4 in
libX11-xcb.so.1.0.0[7f3ffb453000+1000]
Nov 10 13:58:13 sobolev systemd[1]: Started Process Core Dump (PID 2975/UID
0).
Nov 10 13:58:14 sobolev systemd-coredump[2976]: Process 2731 (mate-session)
of user 1000 dumped core.#012#012Stack trace of thread 2731:#012#0
0x00007f3ffb453627 XGetXCBConnection (libX11-xcb.so.1)#012#1
0x00007f3ffc2b9b46 __glXInitialize (libGLX_indirect.so.0)#012#2
0x00007f3ffc2b54a4 GetGLXPrivScreenConfig (libGLX_indirect.so.0)#012#3
0x00007f3ffc2b5d11 glXQueryServerString (libGLX_indirect.so.0)#012#4
0x00007f40098b8939 epoxy_glx_version (libepoxy.so.0)#012#5
0x00007f400cbeb869 gdk_x11_screen_init_gl (libgdk-3.so.0)#012#6
0x00007f400cbebc3a _gdk_x11_screen_update_visuals_for_gl
(libgdk-3.so.0)#012#7  0x00007f400cbf4965 _gdk_x11_screen_init_visuals
(libgdk-3.so.0)#012#8  0x00007f400cbf1990 _gdk_x11_screen_new
(libgdk-3.so.0)#012#9  0x00007f400cbe154d _gdk_x11_display_open
(libgdk-3.so.0)#012#10 0x00007f400cbb5c13 gdk_display_manager_open_display
(libgdk-3.so.0)#012#11 0x00007f400d0a4f50 gtk_init_with_args
(libgtk-3.so.0)#012#12 0x000055e55977eace main (mate-session)#012#13
0x00007f400ac7588a __libc_start_main (libc.so.6)#012#14 0x000055e55977f66a
_start (mate-session)
Nov 10 13:58:14 sobolev /usr/bin/x2gofeature[2987]: x2gofeature called with
options: X2GO_RUN_EXTENSIONS
Nov 10 13:58:14 sobolev
/usr/share/x2go/x2gofeature.d/x2goserver-extensions.features[2993]:
x2goserver-extensions.features called with options: X2GO_RUN_EXTENSIONS
Nov 10 13:58:14 sobolev /usr/bin/x2goserver-run-extensions[3000]:
x2goserver-run-extensions called with options:
localguy-51-1510340283_stDMATE_dp32 post-runcommand
Nov 10 13:58:14 sobolev /usr/bin/x2gofeature[3021]: x2gofeature called with
options: X2GO_DESKTOPSHARING
Nov 10 13:58:14 sobolev
/usr/share/x2go/x2gofeature.d/x2goserver-extensions.features[3041]:
x2goserver-extensions.features called with options: X2GO_DESKTOPSHARING
Nov 10 13:58:14 sobolev
/usr/share/x2go/x2gofeature.d/x2goserver.features[3047]:
x2goserver.features called with options: X2GO_DESKTOPSHARING
Nov 10 13:58:15 sobolev abrt-server[2995]: Deleting problem directory
ccpp-2017-11-10-13:58:14.112723-2731 (dup of
ccpp-2017-11-10-13:54:24.515378-28338)
Nov 10 13:58:15 sobolev
/usr/share/x2go/x2gofeature.d/x2goserver-xsession.features[3054]:
x2goserver-xsession.features called with options: X2GO_DESKTOPSHARING



 Weirdly, this seems not to happen if the hostname is *not* set to a FQDN.
I have

> a machine that is working flawlessly with such a setup:
>
> hostname: shortname
> /etc/hosts: shortname or FQDN not set
> dns: returning public IPv4 and IPv6 addresses for FQDN; shortname will be
> extended to FQDN automatically (and hence also resolves to these public
> addresses)
>
> In this scenario, connecting via X2Go works just fine, even though neither
> address is 127.0.0.1.
>

Just to confirm the /etc/hosts file now looks like this:
127.0.0.1   localhost localhost.localdomain localhost4
localhost4.localdomain4
::1         localhost localhost.localdomain localhost6
localhost6.localdomain6

#150.108.64.57  sobolev.dsm.fordham.edu sobolev
150.108.64.57   sobolev.dsm.fordham.edu 127.0.0.1
150.108.64.65   mandelbrot.dsm.fordham.edu mandelbrot
150.108.64.52   dsm.dsm.fordham.edu dsm
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