Public bug reported:

New report here about Xmir PPA and compiz crash. 
See this bug https://bugs.launchpad.net/xmir/+bug/1196355
I think they are connected someway. 

Here I have reported the bug with apport, so full logs listed.

When I added the ppa:mir-team/system-compositor-testing and rebooted the
system, the desktop in unsusable. Compiz crashes all the time and I
cannot use anythig (except shortcuts). Either Xmir is enabled or
disabled the results are the same.

Regards 
 NikTh

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: unity 7.0.2+13.10.20130705.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.10.0-2.10-generic 3.10.0
Uname: Linux 3.10.0-2-generic x86_64
ApportVersion: 2.10.2-0ubuntu4
Architecture: amd64
CrashCounter: 1
Date: Thu Jul 11 09:11:24 2013
ExecutablePath: /usr/bin/compiz
InstallationDate: Installed on 2013-07-08 (2 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130704)
MarkForUpload: True
ProcCmdline: compiz
SegvAnalysis:
 Segfault happened at: 0x7fe4d6550f3f:  mov    %r8,(%rdi)
 PC (0x7fe4d6550f3f) ok
 source "%r8" ok
 destination "(%rdi)" (0x000088e0) not located in a known VMA region (needed 
writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
 nouveau_pushbuf_kick () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
 ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
 ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
 ?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
Title: compiz crashed with SIGSEGV in nouveau_pushbuf_kick()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-crash need-amd64-retrace saucy third-party-packages xmir

** Tags added: xmir

** Information type changed from Private to Public

** Summary changed:

- compiz crashed with SIGSEGV in nouveau_pushbuf_kick()
+ compiz crashed with SIGSEGV in nouveau_pushbuf_kick() - Xmir

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https://bugs.launchpad.net/bugs/1200097

Title:
  compiz crashed with SIGSEGV in nouveau_pushbuf_kick() - Xmir

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