The CDB process terminated unexspectetly

Andy314

Hallo,
I changed to a new computer and from Windows 8.1 to Windows 10 and change to Qt5.4.2 toQt5.5.1.
Now in debugging mode, after I exit my program in a normal way I get this message in an error box.
It is not really a great problem but it is one click more.
What is the reason and how can I avoid it.

mrjj

Hi
Could you test with a new project if it does the same?

Andy314

Indeed a new project (QtWidgets-App) produces NOT the errors.

mrjj

@Andy314
Ok. so its something in that project that does crash some how.
Very hard to guess what it could be.
Setting a break point in mainwindow destructor and
single step dont provides any hints?

Andy314

Hi @mrjj
Destructor of MainWindow will been never reached in my program.

In general I dont know what happens if a program closes. All worked before so I never thought about it.
Does a close action calls all destructors ? In which order ?
What should I do before close a program ?

mrjj

well normally, the message loop is exited.

int main(int argc, char* argv[]) {
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec(); << this is exited
} << here w destructor should be called.

Andy314

Hi @mrjj

Indeed I get the error after the a.exec in the "}" row.
Debugging gives only assembler-code of my CarDamage-Program: In 0x15187bd I get the message from the debugger.
Any ideas. My return code is 0.
Strange is that I dont get the message in my old system. What has changed in Qt /Debugger?

0x151879a  <+0x022a>         movzx   eax,word ptr [ebp-1Ch]
0x151879e  <+0x022e>         push    eax
0x151879f  <+0x022f>         mov     ecx,dword ptr [ebp-20h]
0x15187a2  <+0x0232>         push    ecx
0x15187a3  <+0x0233>         push    0
0x15187a5  <+0x0235>         push    offset CarDamage!__ImageBase (01380000)
0x15187aa  <+0x023a>         call    CarDamage!WinMain (01519290)
0x15187af  <+0x023f>         mov     dword ptr [CarDamage!mainret (0191921c)],eax
0x15187b4  <+0x0244>         cmp     dword ptr [CarDamage!managedapp (01919220)],0
0x15187bb  <+0x024b>         jne     CarDamage!__tmainCRTStartup+0x25a (015187ca)
0x15187bd  <+0x024d>         mov     edx,dword ptr [CarDamage!mainret (0191921c)]          **** Debuger Msg
0x15187c3  <+0x0253>         push    edx
0x15187c4  <+0x0254>         call    dword ptr [CarDamage!_imp__exit (0191a13c)]
0x15187ca  <+0x025a>         cmp     dword ptr [CarDamage!has_cctor (01919218)],0

mrjj

Well its odd if it really is same code.
Often its a double delete of some data.
Say mainwindow deletes something and u do to.
Else it's some mismatch of Qt dll versions or something like that.
But should do in fresh project also.

You could try to create a new button and do
MainWindow *test=new MainWindow()
delete test;

just to see if the actual destruction of mainwind that does it.

Also, do you have any global data?

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The CDB process terminated unexspectetly