Qt Creator 2.6rc crashes on startup

#0  0x00007ffff56fc82e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007fffe4d6f258 in QTJSC::JIT::privateCompileCTIMachineTrampolines(QTWTF::RefPtr<QTJSC::ExecutablePool>*, QTJSC::JSGlobalData*, QTJSC::MacroAssemblerCodePtr*, QTJSC::MacroAssemblerCodePtr*, QTJSC::MacroAssemblerCodePtr*, QTJSC::MacroAssemblerCodePtr*) ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtScript.so.4
No symbol table info available.
#2  0x00007fffe4d8a5e5 in QTJSC::JIT::compileCTIMachineTrampolines(QTJSC::JSGlobalData*, QTWTF::RefPtr<QTJSC::ExecutablePool>*, QTJSC::MacroAssemblerCodePtr*, QTJSC::MacroAssemblerCodePtr*, QTJSC::MacroAssemblerCodePtr*, QTJSC::MacroAssemblerCodePtr*) ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtScript.so.4
No symbol table info available.
#3  0x00007fffe4d7f13a in QTJSC::JITThunks::JITThunks(QTJSC::JSGlobalData*) ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtScript.so.4
No symbol table info available.
#4  0x00007fffe4dd5163 in QTJSC::JSGlobalData::JSGlobalData(bool) ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtScript.so.4
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
#5  0x00007fffe4dd580c in QTJSC::JSGlobalData::create() ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtScript.so.4
No symbol table info available.
#6  0x00007fffe4e6c96d in QScriptEnginePrivate::QScriptEnginePrivate() ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtScript.so.4
No symbol table info available.
#7  0x00007fffe4e6d956 in QScriptEngine::QScriptEngine() ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtScript.so.4
No symbol table info available.
#8  0x00007fffdd90704c in QDeclarativeScriptEngine::QDeclarativeScriptEngine(QDeclarativeEnginePrivate*) ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtDeclarative.so.4
No symbol table info available.
#9  0x00007fffdd90884f in QDeclarativeEnginePrivate::QDeclarativeEnginePrivate(QDeclarativeEngine*) ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtDeclarative.so.4
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#10 0x00007fffdd908b51 in QDeclarativeEngine::QDeclarativeEngine(QObject*) ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtDeclarative.so.4
No symbol table info available.
#11 0x00007fffdd7e6056 in QDeclarativeViewPrivate::init() ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtDeclarative.so.4
No symbol table info available.
#12 0x00007fffdd7e6b93 in QDeclarativeView::QDeclarativeView(QWidget*) ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/../../libQtDeclarative.so.4
No symbol table info available.
#13 0x00007fffcfa20806 in ?? ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/libWelcome.so
No symbol table info available.
#14 0x00007fffcfa20aa6 in ?? ()
   from /home/dt/qtcreator-2.5.84/lib/qtcreator/plugins/QtProject/libWelcome.so
No symbol table info available.
#15 0x00007ffff7bc3374 in ExtensionSystem::Internal::PluginSpecPrivate::initializePlugin() ()
   from /home/dt/qtcreator-2.5.84/bin/../lib/qtcreator/libExtensionSystem.so.1
No symbol table info available.
#16 0x00007ffff7bbee43 in ExtensionSystem::Internal::PluginManagerPrivate::loadP---Type <return> to continue, or q <return> to quit---
lugin(ExtensionSystem::PluginSpec*, ExtensionSystem::PluginSpec::State) ()
   from /home/dt/qtcreator-2.5.84/bin/../lib/qtcreator/libExtensionSystem.so.1
No symbol table info available.
#17 0x00007ffff7bbf197 in ExtensionSystem::Internal::PluginManagerPrivate::loadPlugins() ()
   from /home/dt/qtcreator-2.5.84/bin/../lib/qtcreator/libExtensionSystem.so.1
No symbol table info available.
#18 0x000000000040df5d in ?? ()
No symbol table info available.
#19 0x00007ffff55d076d in __libc_start_main ()
   from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#20 0x0000000000406e59 in ?? ()
No symbol table info available.
#21 0x00007fffffffe2a8 in ?? ()
No symbol table info available.
#22 0x000000000000001c in ?? ()
No symbol table info available.
#23 0x0000000000000001 in ?? ()
No symbol table info available.
#24 0x00007fffffffe554 in ?? ()
No symbol table info available.
#25 0x0000000000000000 in ?? ()