unity-2d-launcher crashed with SIGSEGV in QObject::thread()

This crash happened in shortly after the crash in bug 870822. They may or may not be related.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity-2d-launcher 4.12.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
Date: Sat Oct 8 11:46:21 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/unity-2d-launcher
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcCmdline: unity-2d-launcher
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f2119d71b68 <_ZNK7QObject6threadEv+8>: mov 0x8(%rax),%rax
 PC (0x7f2119d71b68) ok
 source "0x8(%rax)" (0x38003600310036) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: unity-2d
StacktraceTop:
 QObject::thread() const () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
 QObject::QObject(QObjectPrivate&, QObject*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
 QDBusServiceWatcher::QDBusServiceWatcher(QObject*) () from /usr/lib/x86_64-linux-gnu/libQtDBus.so.4
 LauncherApplication::setDynamicQuicklistImporter(QString const&) () from /usr/lib/libunity-2d-private.so.0
 LauncherApplication::updateOverlaysState(QString const&, QMap<QString, QVariant>) () from /usr/lib/libunity-2d-private.so.0
Title: unity-2d-launcher crashed with SIGSEGV in QObject::thread()
UpgradeStatus: Upgraded to oneiric on 2011-09-30 (7 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare vboxusers
XsessionErrors:
 (nautilus:1966): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed
 (nautilus:1966): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed
 (bluetooth-applet:1961): Bluetooth-WARNING **: Cannot set discoverable: No such device