X2Go Bug report logs - #410
Segfault of _X11TransWritev in libNX_X11.so.6 with libQtGui

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Package: nxagent; Maintainer for nxagent is X2Go Developers <x2go-dev@lists.x2go.org>; Source for nxagent is src:nx-libs.

Reported by: Sven Willenberger <swillenberger@upsicorp.com>

Date: Fri, 24 Jan 2014 02:50:02 UTC

Severity: normal

Merged with 113, 467

Found in version

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

Full log

Message #26 received at 410@bugs.x2go.org (full text, mbox, reply):

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From swillenberger@upsicorp.com  Thu Jun 26 22:49:20 2014
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Date: Thu, 26 Jun 2014 16:39:24 -0400
From: Sven Willenberger <swillenberger@upsicorp.com>
To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Cc: 410@bugs.x2go.org
Subject: Re: Bug#410: Segfault of _X11TransWritev in libNX_X11.so.6 with
Message-ID: <20140626163924.4e60b559@dogpound>
In-Reply-To: <20140612220605.Horde.C9kE3LBXZ1cmFL5CtR1WBw9@mail.das-netzwerkteam.de>
References: <20140123213919.0cba2367@dogpound>
Organization: United Pay Systems
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[Message part 1 (text/plain, inline)]
So this goes into tracker:

I have isolated the problem to the following change in the nx-libs
Makefile between and, which persists through HEAD:

--- nx-libs-   2014-06-14 12:45:27.000000000 -0400
+++ nx-libs-HEAD/Makefile       2014-06-12 16:31:48.000000000 -0400
@@ -3,6 +3,7 @@
 INSTALL_DIR=install -d -m 755
 INSTALL_FILE=install -m 644
 INSTALL_PROGRAM=install -m 755
 RM_FILE=rm -f
 RM_DIR=rmdir -p --ignore-fail-on-non-empty
@@ -114,6 +115,13 @@
                                "$$(string_rep "$$dirname" nx-X11/.build-exports/include "$(DESTDIR)$(PREFIX)/include/nx")"/ || true; \
            done; \
+       # Provide means for Xinerama support in NX/X2Go sessions. This
+       # This also requires two post-install symlinks:
+       # (DESTDIR)$(NXLIBDIR)/X11/Xinerama/libNX_X11.so.6 -> /usr/<libdir>/libX11.so.6
+       # (DESTDIR)$(NXLIBDIR)/X11/Xinerama/libNX_Xext.so.6 -> /usr/<libdir>/libXext.so.6
+       $(INSTALL_DIR) $(DESTDIR)$(NXLIBDIR)/X11/Xinerama
+       $(INSTALL_SYMLINK) ../libNX_Xinerama.so.1 $(DESTDIR)$(NXLIBDIR)/X11/Xinerama/libXinerama.so.1
        $(INSTALL_DIR) $(DESTDIR)$(PREFIX)/include/nx/X11/bitmaps
        $(INSTALL_FILE) nx-X11/.build-exports/include/X11/bitmaps/* \

Commenting out the Xinerama lines and rebuilding results in a clean run
of my (and your) python scripts as well as VLC player.

I have attached a diff (excepting whitespace differences (diff -ub) of
my system's Xinerama.c (xorg's libXinerama 1.1.3) and the one provided
in x2go's source (based on XFree86).

Sven Willenberger
United Pay Systems International

[Xinerama_c.diff (text/x-patch, attachment)]
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