[Bug 1622154] [NEW] x2goagent crashes in libNX_X11.so.6 in Ubuntu 16.04

[Colin Finck]

Public bug reported:

When using Ubuntu 16.04 as an X2Go server and connecting to launch a
graphical Java SWT application (like Eclipse or Jameica), the connection
is canceled and x2goagent crashes on the server with a core dump.
Analyzing this core dump with gdb reveals:

Core was generated by `/usr/lib/nx/../x2go/bin/x2goagent -extension XFIXES -nolisten tcp -nolisten tcp'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f5ae0e46e3f in _XData32 () from /usr/lib/x86_64-linux-gnu/libNX_X11.so.6

This worked well in Ubuntu 14.04.

Similar bugs are reported here:
[1] https://github.com/ArcticaProject/nx-libs/issues/82
[2] https://github.com/atom/atom/issues/4360
[3] http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=938

According to [2], it is related to the X11 BIG-REQUESTS extension, which is either not supported by this X2Go version or not handled properly.
Right now, this problem can be hackfixed by binary patching out "BIG-REQUESTS" to "_IG-REQUESTS" in libxcb.so.1. This is a very bad solution for a production system though..

Note that this problem cannot be reproduced using very simple GUI
applications (like xmessage or gxmessage). Apparently, these don't lead
to a X11 big request.

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Package changed: kaccounts-providers (Ubuntu) => ubuntu

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Title:
  x2goagent crashes in libNX_X11.so.6 in Ubuntu 16.04

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