QSymbianControl::FocusChanged is a Symbian non-leaving virtual function. It should not leave or throw exceptions.

However under OOM testing, specifically the QDesktopWidget test in tst_exceptionsafety_objects, it appears that exceptions can be thrown. This results in a crash, as it is called from QSymbianControl::setFocusSafely, which calls it in a TRAP.

Here is the call stack from the point that the allocation fails.

48 QAllocFailAllocator::Alloc() I:\qt\tests\auto\exceptionsafety_objects\oomsimulator.h:214 0x6082ae86
47 User::Alloc() I:\sf\os\kernelhwsrv\kernel\eka\euser\us_exec.cpp:1749 0x6000fa74
46 malloc() M:\sf\os\ossrv\genericopenlibs\openenvcore\libc\src\ualloc.cpp:54 0x0fed56d1
45 qMalloc() I:\qt\src\corelib\global\qmalloc.cpp:55 0x608a824b
44 QListData::detach3() I:\qt\src\corelib\tools\qlist.cpp:137 0x609a0427
43 QList<QWidget *>::detach_helper() I:\qt\src\corelib\tools\qlist.h:604 0x631bba29
42 QList<QWidget *>::detach() I:\qt\src\corelib\tools\qlist.h:122 0x631ba90a
41 QList<QWidget *>::append() I:\qt\src\corelib\tools\qlist.h:469 0x631ba77c
40 QApplication::setActiveWindow() I:\qt\src\gui\kernel\qapplication.cpp:2430 0x63273bfe
39 QSymbianControl::FocusChanged() I:\qt\src\gui\kernel\qapplication_s60.cpp:872 0x632d50d8
38 CCoeControl::SetFocus() M:\sf\mw\classicui\lafagnosticuifoundation\cone\src\COECNTRL.CPP:2011 0x4060712c
37 CCoeAppUi::SetFocusToControl() M:\sf\mw\classicui\lafagnosticuifoundation\cone\src\COEAUI.CPP:728 0x406025d5
36 CCoeAppUi::HandleStackChanged() M:\sf\mw\classicui\lafagnosticuifoundation\cone\src\COEAUI.CPP:646 0x406023f2
35 CCoeAppUi::DoAddToStackL() M:\sf\mw\classicui\lafagnosticuifoundation\cone\src\COEAUI.CPP:832 0x4060286f
34 CCoeAppUi::DoAddToStackL() M:\sf\mw\classicui\lafagnosticuifoundation\cone\src\COEAUI.CPP:811 0x406027db
33 CCoeAppUi::AddToStackL() M:\sf\mw\classicui\lafagnosticuifoundation\cone\src\COEAUI.CPP:582 0x406022b0
32 QSymbianControl::setFocusSafely() I:\qt\src\gui\kernel\qapplication_s60.cpp:949 0x632d5544
31 QSymbianControl::~QSymbianControl() I:\qt\src\gui\kernel\qapplication_s60.cpp:356 0x632d2ee3
30 0x632D82FC( QtGui.dll )() 0x632d82fc
29 QWidgetPrivate::deleteSysExtra() I:\qt\src\gui\kernel\qwidget_s60.cpp:911 0x632ddb7d
28 QWidgetPrivate::deleteExtra() I:\qt\src\gui\kernel\qwidget.cpp:1591 0x632b58cb
27 QWidgetPrivate::~QWidgetPrivate() I:\qt\src\gui\kernel\qwidget.cpp:246 0x632b3292
26 QDesktopWidgetPrivate::~QDesktopWidgetPrivate() I:\qt\src\gui\kernel\qdesktopwidget_s60.cpp:86 0x632e0c36
25 0x632E14BC( QtGui.dll )() 0x632e14bc
24 QScopedPointerDeleter<QObjectData>::cleanup() I:\qt\src\corelib\tools\qscopedpointer.h:63 0x60930b58
23 QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>::~QScopedPointer() I:\qt\src\corelib\tools\qscopedpointer.h:100 0x60930b25
22 QObject::~QObject() I:\qt\src\corelib\kernel\qobject.cpp:982 0x60931297
21 QWidget::QWidget() I:\qt\src\gui\kernel\qwidget.cpp:1058 0x632b3d89
20 QDesktopWidget::QDesktopWidget() I:\qt\src\gui\kernel\qdesktopwidget_s60.cpp:121 0x632e0fb4
19 WidgetCreator<QDesktopWidget>::operator() I:\qt\tests\auto\exceptionsafety_objects\tst_exceptionsafety_objects.cpp:407 0x60814dde
18 doOOMTest<AbstractTester>() I:\qt\tests\auto\exceptionsafety_objects\tst_exceptionsafety_objects.cpp:201 0x608150be
17 tst_ExceptionSafetyObjects::widgets() I:\qt\tests\auto\exceptionsafety_objects\tst_exceptionsafety_objects.cpp:481 0x6081387a
16 tst_ExceptionSafetyObjects::qt_metacall() I:\qt\tests\auto\exceptionsafety_objects\tmp\moc\debug_shared\tst_exceptionsafety_objects.moc:91 0x60813e36
15 QMetaObject::metacall() I:\qt\src\corelib\kernel\qmetaobject.cpp:237 0x60921f64
14 QMetaMethod::invoke() I:\qt\src\corelib\kernel\qmetaobject.cpp:1533 0x609245a0
13 QMetaObject::invokeMethod() I:\qt\src\corelib\kernel\qmetaobject.cpp:1112 0x60923b7b
12 QMetaObject::invokeMethod() I:\qt\src\corelib\kernel\qobjectdefs.h:395 0x6087b71d
11 QTest::qInvokeTestMethodDataEntry() I:\qt\src\testlib\qtestcase.cpp:1212 0x60bf2a1e
10 QTest::qInvokeTestMethod() I:\qt\src\testlib\qtestcase.cpp:1308 0x60bf31f8
9 QTest::qInvokeTestMethods() I:\qt\src\testlib\qtestcase.cpp:1463 0x60bf39ae
8 QTest::qExec() I:\qt\src\testlib\qtestcase.cpp:1666 0x60bf3bf6
7 main() I:\qt\tests\auto\exceptionsafety_objects\tst_exceptionsafety_objects.cpp:782 0x60813c21
6 QtMainWrapper() I:\qt\src\s60main\qts60main_mcrt0.cpp:90 0x6082ca82
5 E32Main() I:\qt\src\s60main\qts60main.cpp:57 0x6082c61c
4 _E32Startup() M:\sf\os\kernelhwsrv\kernel\eka\euser\epoc\win32\uc_exe.cpp:87 0x6082bfac
3 DThread::EpocThreadFunction() I:\sf\os\kernelhwsrv\kernel\eka\kernel\win32\ckernel.cpp:84 0x0096ac23
2 NThread::StartThread() I:\sf\os\kernelhwsrv\kernel\eka\nkern\win32\ncthrd.cpp:187 0x009695b7
1 0x7C80B729( KERNEL32.dll )() 0x7c80b729