[Bug 985202] [NEW] libx11 causes kwin to crash on login (over NX protocol)

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This behavior is 100% reproducible. I have freenx-server installed from here:
https://launchpad.net/~freenx-team/+archive/ppa

And am logging in from a remote machine with the newest nxclient from
nomachine.org. What happens is that upon login or shortly thereafter,
kwin crashes with a segfault. After restarting, it crashes at regular
intervals as well.

I reported a bug to the KDE4 tracker:
https://bugs.kde.org/show_bug.cgi?id=298370

And it was marked a duplicate of a bug NOT related to NX:
https://bugs.kde.org/show_bug.cgi?id=293209

Judging from the backtrace, and from the comments in bug 293209, the
problem is related to Xorg, and the people at KDE seem to think that the
problem might even be Ubuntu 12.04 specific. So I decided to re-report
the bug here and give you pointers to the relevant KDE bugreports.

We are really desperate to get Kwin working under NX and are willing to
test whatever you like!

Many thanks in advance.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libx11-6 2:1.4.99.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
ApportVersion: 2.0.1-0ubuntu4
Architecture: i386
Date: Wed Apr 18 16:18:16 2012
ProcEnviron:
 LANGUAGE=
 TERM=xterm
 PATH=(custom, no user)
 SHELL=/bin/bash
SourcePackage: libx11
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xorg-server
     Importance: Unknown
         Status: Unknown

** Affects: libxrandr (Ubuntu)
     Importance: Undecided
     Assignee: Chris Halse Rogers (raof)
         Status: Confirmed


** Tags: amd64 apport-bug i386 kubuntu patch precise
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libx11 causes kwin to crash on login (over NX protocol)
https://bugs.launchpad.net/bugs/985202
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