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When I come back from CS Source full screen to screen of Xubuntu by
typing tab+alt, the apport said that xfwm4 crashed.

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: xfwm4 4.10.0-4ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-13.23-generic 3.8.3
Uname: Linux 3.8.0-13-generic i686
ApportVersion: 2.9.2-0ubuntu1
Architecture: i386
CrashCounter: 1
Date: Tue Mar 19 18:00:17 2013
ExecutablePath: /usr/bin/xfwm4
InstallationDate: Installed on 2013-03-15 (3 days ago)
InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Alpha i386 (20130315)
MarkForUpload: True
ProcCmdline: xfwm4 --replace
ProcCwd: /home/lukasz
ProcEnviron:
 LANGUAGE=pl:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb6ee2b94 <XUnmapWindow+20>:    mov    0x4d0(%esi),%eax
 PC (0xb6ee2b94) ok
 source "0x4d0(%esi)" (0x000004d0) not located in a known VMA region (needed 
readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: xfwm4
StacktraceTop:
 XUnmapWindow (dpy=0x0, w=w@entry=10497032) at ../../src/UnmapWin.c:39
 wireframeUpdate (c=c@entry=0xb8945fa0, xwindow=10497032) at wireframe.c:56
 clientCycleEventFilter (xevent=0xbfdb8cfc, data=0xbfdb8f28) at cycle.c:337
 eventXfwmFilter (gdk_xevent=0xbfdb8cfc, event=0xb88c4ed8, data=0xb892a098) at 
event_filter.c:158
 gdk_event_apply_filters (filters=<optimized out>, event=<optimized out>, 
xevent=<optimized out>) at 
/build/buildd/gtk+2.0-2.24.16/gdk/x11/gdkevents-x11.c:356
Title: xfwm4 crashed with SIGSEGV in XUnmapWindow()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: xfwm4 (Ubuntu)
     Importance: Medium
         Status: New


** Tags: apport-crash i386 raring xfce xfwm4
-- 
xfwm4 crashed with SIGSEGV in XUnmapWindow()
https://bugs.launchpad.net/bugs/1157311
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