compiz crashed with SIGSEGV in free()

The desktop got frozen when I opened a terminal and started a wget process. So I do not think that the action is related to the crash. Something like this happens once a week since I've updated to Ubuntu 11.10

As it happens quite often when I'm using Google Chrome it might be somehow involved in the crash

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: libnux-1.0-0 1.14.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu2
Architecture: i386
CrashCounter: 1
Date: Sat Oct 1 20:10:50 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427)
ProcCmdline: compiz
SegvAnalysis:
 Segfault happened at: 0xf9d656: cmp 0xc(%eax),%ecx
 PC (0x00f9d656) ok
 source "0xc(%eax)" (0xffd2dbeb) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 ?? () from /lib/i386-linux-gnu/libc.so.6
 free () from /lib/i386-linux-gnu/libc.so.6
 ?? () from /usr/lib/i386-linux-gnu/libdrm_intel.so.1
 ?? () from /usr/lib/i386-linux-gnu/libdrm_intel.so.1
 drm_intel_bo_unreference () from /usr/lib/i386-linux-gnu/libdrm_intel.so.1
Title: compiz crashed with SIGSEGV in free()
UpgradeStatus: Upgraded to oneiric on 2011-09-26 (5 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (nautilus:1438): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed
 (nautilus:1438): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed
 (process:1477): GdkPixbuf-CRITICAL **: gdk_pixbuf_new_from_file_at_scale: assertion `filename != NULL' failed
 (process:1477): GdkPixbuf-CRITICAL **: gdk_pixbuf_new_from_file_at_scale: assertion `filename != NULL' failed
 (process:1477): GdkPixbuf-CRITICAL **: gdk_pixbuf_new_from_file_at_scale: assertion `filename != NULL' failed