1. Download the attached project.
   It's a project for manually testing Creator's debugger with an additional compile fix. You can also find it in the Creator's repository in tests\manual\debugger\simple.
2. Build this in debug mode.

   qmake CONFIG+=debug && nmake
   

3. Start the resulting executable.
   It will crash right away:

   0	QMetaObject::static_metacall	qmetaobject.cpp	280	0x5919ca78	
   1	QMetaMethod::fromSignalImpl	qmetaobject.cpp	2014	0x591a0557	
   2	QMetaMethod::fromSignal<void (__thiscall QQuickAccessibleAttached::*)(void)>	qmetaobject.h	146	0x51509c96	
   3	`dynamic initializer for 'QQuickAccessibleAttached::sigPress''	qquickaccessibleattached.cpp	295	0x515cfd22	
   4	_initterm	MSVCR100D		0x58d2866c	
   5	_CRT_INIT	crtdll.c	284	0x515ca173	
   6	__DllMainCRTStartup	crtdll.c	506	0x515ca47e	
   7	_DllMainCRTStartup	crtdll.c	476	0x515ca3c1	
   8	LdrpCallInitRoutine	ntdll32		0x777099a0	
   9	LdrpRunInitializeRoutines	ntdll32		0x7770d939	
   10	LdrpInitializeProcess	ntdll32		0x7771686c	
   11	_LdrpInitialize	ntdll32		0x77715326	
   12	LdrInitializeThunk	ntdll32		0x77709ef9	
   

   In QMetaObject::static_metacall, all members of this->d are 0.

Release builds do not seem to crash. I can reproduce the bug with my own build of Qt 5.4 as well as with the package but not with Qt 5.3.2.

I'll see how far I can strip the project down.