[Qt-creator] Help debugging a heap error

[Henry Skoglund]

Hi,

things seem to be dying in the wrong order and the death throes clobbers 
your heap, try reordering your objects in your .h file. /Rgrds Henry


On 2014-06-04 17:14, Murphy, Sean wrote:
> I’ve recently introduced a bug in my program that is causing my
> application to crash when quitting, but I’m having trouble figuring out
> what is causing it.  The error reported in the Application Output window is:
>
>    HEAP: Free Heap block 15b73e68 modified at 15b73e80 after it was freed
>
> Here’s the debugger stack
>
> 0              ntdll!TpWaitForAlpcCompletion
> C:\windows\system32\ntdll.dll                 0x77410575
>
> 1              ??                                           0x28f5c8
>
> 2              ntdll!AlpcMaxAllowedMessageLength
> C:\windows\system32\ntdll.dll                 0x773ca412
>
> 3              ??                                           0x15b73e68
>
> 4              ntdll!RtlReleasePebLock
> C:\windows\system32\ntdll.dll                 0x773735b7
>
> 5              ??                                           0xd
>
> 6              ??                                           0x8
>
> 7              ??                                           0x28f690
>
> 8              ntdll!LdrLoadAlternateResourceModuleEx
> C:\windows\system32\ntdll.dll                 0x773734a2
>
> 9              ??                                           0x15b73ed0
>
> 10           ntdll!RtlValidateHeap
> C:\windows\system32\ntdll.dll                 0x7741172e
>
> 11           ??                                           0x13e50000
>
> 12           ntdll!AlpcMaxAllowedMessageLength
> C:\windows\system32\ntdll.dll                 0x773cac29
>
> 13           ??                                           0x13e50000
>
> 14           ntdll!LdrLoadAlternateResourceModuleEx
> C:\windows\system32\ntdll.dll                 0x773734a2
>
> 15           ??                                           0x15b73ed0
>
> 16           msvcrt!free
> C:\windows\syswow64\msvcrt.dll                           0x75e798cd
>
> 17           ??                                           0x13e50000
>
> 18           QtSharedPointer::ExternalRefCountData::operator
> delete           qsharedpointer_impl.h 168         0x6b9bed05
>
> 19           QObject::~QObject         qobject.cpp        796
> 0x6b9401b4
>
> 20           QAction::~QAction          qaction.cpp        576
> 0xa602c45
>
> 21           QAction::~QAction          qaction.cpp        600
> 0xa602c73
>
> 22           QObjectPrivate::deleteChildren
> qobject.cpp        1835       0x6b941c3f
>
> 23           QWidget::~QWidget       qwidget.cpp       1486       0xa62ec02
>
> 24           QMainWindow::~QMainWindow
> qmainwindow.cpp          378         0xa7547fe
>
> 25           MainWindow::~MainWindow    mainwindow.cpp
> 249         0x4059d1
>
> 26           qMain   main.cpp             8              0x40168e
>
> 27           WinMain at 16     qtmain_win.cpp               131
> 0x43a2ed
>
> 28           main                                      0x469a4d
>
> I’ve set a breakpoint in my MainWindow ::~MainWindow(), but I’m able to
> successfully step through all of my code without anything crashing.  I’m
> pretty weak at using debuggers, so I’m unsure what to try next?
>
> As you can see from the stack trace, I’m on Windows.  And I’m not sure
> what other tools I have at my disposal to help out?
>
> Sean
>
>
>
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