Details
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Bug
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Resolution: Done
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P2: Important
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5.1.0
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None
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Reproduced on 3 variants of Qt 5.1 from the Online installer:
* Win 7 32-bit, "msvc2010 32-bit"
* Win 8 64-bit, "msvc2012 64-bit OpenGL"
* Win 8 64-bit, "MinGW 4.8 (32 bit)"
Description
Details
The attached example contains:
- A minimal Qt Quick Rectangle
- Its MouseArea pops up a Qt Quick Controls Menu
- It emits a signal when the menu is clicked
- A minimal MainWindow from Qt Designer
- Nothing added in Designer
- Its central widget is a QQuickView containing the Rectangle
- Its only function is to launch a QFileDialog in response the the Rectangle's signal
Clicking the menu causes a segfault. If the signal was emitted in MouseEvent::onClicked instead of Menu::onTriggered, the dialog launches without crashing.
In my full project, I have several QML signals from different menus, connected to different C++ slots. Every slot that launches a dialog (QFileDialog or custom QDialog-derived ones) exhibits this bug
In my full project, the program crashes the very first time a menu is clicked. With this minimal example, it's harder to cause a crash (thus some repetitions may be required to reproduce it, as shown below)
Steps to reproduce
- Compile + run the attached code in a debugger
- Click on the dark gray surface to open the menu, and select "Load Project"
- If it hasn't crashed yet, click "Cancel", maximize the window, and repeat step #2
- If it hasn't crashed yet, click "Cancel", un-maximize the window, and repeat step #2
- If it hasn't crashed yet, repeat steps #3 and #4 – it should crash within 5 iterations
Workaround
Explicitly set Qt::QueuedConnection for every connection that launches dialogs.
Stack trace from MinGW build
0 QSharedDataPointer<QWindowsWindowCursorData>::QSharedDataPointer qshareddata.h 90 0x629053bc 1 QWindowsWindowCursor::QWindowsWindowCursor qwindowscursor.cpp 504 0x62865bd7 2 QWindowsWindow::cursor qwindowswindow.h 239 0x62918efc 3 applyNewCursor qwindowswindow.cpp 1815 0x62847b3c 4 QWindowsWindow::setCursor qwindowswindow.cpp 1825 0x62847bc6 5 QWindowsCursor::changeCursor qwindowscursor.cpp 432 0x6286597e 6 QWindowPrivate::applyCursor qwindow.cpp 2269 0x17fb27e2 7 QWindowPrivate::setCursor qwindow.cpp 2255 0x17fb271d 8 QWindow::setCursor qwindow.cpp 2214 0x17fb25a2 9 applyCursor qwidget_qpa.cpp 1013 0x9822dc3 10 qt_qpa_set_cursor qwidget_qpa.cpp 1051 0x9823001 11 QWidgetPrivate::setCursor_sys qwidget_qpa.cpp 332 0x98208a3 12 QWidget::setCursor qwidget.cpp 4599 0x9804af3 13 QSizeGrip::moveEvent qsizegrip.cpp 445 0x9955942 14 QWidget::event qwidget.cpp 8033 0x980d9fb 15 QSizeGrip::event qsizegrip.cpp 503 0x9955b23 16 QApplicationPrivate::notify_helper qapplication.cpp 3455 0x97ddaf1 17 QApplication::notify qapplication.cpp 3420 0x97dd978 18 QCoreApplication::notifyInternal qcoreapplication.cpp 871 0x6b90a8d6 19 QCoreApplication::sendEvent qcoreapplication.h 232 0x9b155d1 20 QWidgetPrivate::sendPendingMoveAndResizeEvents qwidget.cpp 6993 0x980b454 21 QWidgetPrivate::show_helper qwidget.cpp 7050 0x980b73a 22 QWidgetPrivate::show_recursive qwidget.cpp 6980 0x980b366 23 QWidgetPrivate::showChildren qwidget.cpp 7388 0x980c4b8 24 QWidgetPrivate::show_helper qwidget.cpp 7056 0x980b76a 25 QWidget::setVisible qwidget.cpp 7307 0x980c08f 26 QDialog::setVisible qdialog.cpp 711 0x99b51d5 27 QFileDialog::setVisible qfiledialog.cpp 813 0x99b9fb7 28 QWidget::show qwidget.cpp 6957 0x980b28f 29 QDialog::exec qdialog.cpp 520 0x99b48ca 30 QFileDialog::getOpenFileName qfiledialog.cpp 1792 0x99bc6e4 31 MainWindow::parseProject mainwindow.cpp 22 0x4018fe 32 MainWindow::qt_static_metacall moc_mainwindow.cpp 67 0x4019d1 33 QMetaObject::activate qobject.cpp 3479 0x6b934cd0 34 QQmlVMEMetaObject::activate qqmlvmemetaobject.cpp 1350 0xa046bf 35 QQmlVMEMetaObject::metaCall qqmlvmemetaobject.cpp 907 0xa02ba2 36 QAbstractDynamicMetaObject::metaCall qobject_p.h 413 0xb6506b 37 QMetaObject::metacall qmetaobject.cpp 305 0x6b90f33a 38 CallMethod qv8qobjectwrapper.cpp 1605 0xad17ab 39 CallPrecise qv8qobjectwrapper.cpp 1839 0xad21aa 40 QV8QObjectWrapper::Invoke qv8qobjectwrapper.cpp 2053 0xad2f27 41 v8::internal::HandleApiCallHelper<false> builtins.cc 1164 0x10e8c175 42 v8::internal::Builtin_Impl_HandleApiCall builtins.cc 1182 0x10e86def 43 v8::internal::Builtin_HandleApiCall builtins.cc 1181 0x10e86dce 44 ?? 0x2210a236 45 ?? 0x22128e84 46 ?? 0x2215976b 47 ?? 0x2210fef9 48 ?? 0x2210a0aa 49 v8::internal::Invoke execution.cc 125 0x10eae66e 50 v8::internal::Execution::Call execution.cc 201 0x10eae9d0 51 v8::internal::Execution::Call execution.cc 168 0x10eae822 52 v8::Function::Call api.cc 3788 0x10e64389 53 QQmlJavaScriptExpression::evaluate qqmljavascriptexpression.cpp 180 0xa7c422 54 QQmlJavaScriptExpression::evaluate qqmljavascriptexpression.cpp 127 0xa7c15d 55 QQmlBoundSignalExpression::evaluate qqmlboundsignal.cpp 223 0xa3b73c 56 QQmlBoundSignal_callback qqmlboundsignal.cpp 384 0xa3c011 57 QQmlNotifier::emitNotify qqmlnotifier.cpp 83 0xa6928f 58 QQmlData::signalEmitted qqmlengine.cpp 658 0xa05656 59 QMetaObject::activate qobject.cpp 3372 0x6b9347e1 60 QMetaObject::activate qobject.cpp 3354 0x6b934672 61 QQuickMenuItem::triggered moc_qquickmenuitem_p.cpp 803 0x6678992a 62 QQuickMenuItem::qt_static_metacall moc_qquickmenuitem_p.cpp 661 0x667893d9 63 QMetaObject::activate qobject.cpp 3479 0x6b934cd0 64 QMetaObject::activate qobject.cpp 3354 0x6b934672 65 QQuickAction::triggered moc_qquickaction_p.cpp 330 0x66787742 66 QQuickAction::trigger qquickaction.cpp 390 0x6678250c 67 QQuickMenuItem::trigger qquickmenuitem.cpp 607 0x66785e59 68 QQuickMenuItem::qt_static_metacall moc_qquickmenuitem_p.cpp 668 0x6678944a 69 QQuickMenuItem::qt_metacall moc_qquickmenuitem_p.cpp 749 0x667896c6 70 QMetaObject::metacall qmetaobject.cpp 307 0x6b90f362 71 CallMethod qv8qobjectwrapper.cpp 1605 0xad17ab 72 CallPrecise qv8qobjectwrapper.cpp 1839 0xad21aa 73 QV8QObjectWrapper::Invoke qv8qobjectwrapper.cpp 2053 0xad2f27 74 v8::internal::HandleApiCallHelper<false> builtins.cc 1164 0x10e8c175 75 v8::internal::Builtin_Impl_HandleApiCall builtins.cc 1182 0x10e86def 76 v8::internal::Builtin_HandleApiCall builtins.cc 1181 0x10e86dce 77 ?? 0x2210a236 78 ?? 0x22128e84 79 ?? 0x22159117 80 ?? 0x22158eeb 81 ?? 0x2210fef9 82 ?? 0x2210a0aa 83 v8::internal::Invoke execution.cc 125 0x10eae66e 84 v8::internal::Execution::Call execution.cc 201 0x10eae9d0 85 v8::internal::Execution::Call execution.cc 168 0x10eae822 86 v8::Function::Call api.cc 3788 0x10e64389 87 QQmlJavaScriptExpression::evaluate qqmljavascriptexpression.cpp 180 0xa7c422 88 QQmlJavaScriptExpression::evaluate qqmljavascriptexpression.cpp 127 0xa7c15d 89 QQmlBoundSignalExpression::evaluate qqmlboundsignal.cpp 223 0xa3b73c 90 QQmlBoundSignal_callback qqmlboundsignal.cpp 384 0xa3c011 91 QQmlNotifier::emitNotify qqmlnotifier.cpp 83 0xa6928f 92 QQmlData::signalEmitted qqmlengine.cpp 658 0xa05656 93 QMetaObject::activate qobject.cpp 3372 0x6b9347e1 94 QMetaObject::activate qobject.cpp 3354 0x6b934672 95 QQuickMouseArea::released moc_qquickmousearea_p.cpp 846 0x4501e1b 96 QQuickMouseArea::setPressed qquickmousearea.cpp 1228 0x44738ad 97 QQuickMouseArea::mouseReleaseEvent qquickmousearea.cpp 850 0x4472326 98 QQuickItemPrivate::deliverMouseEvent qquickitem.cpp 4471 0x442d867 99 QQuickWindow::sendEvent qquickwindow.cpp 2160 0x443d5a6 100 QQuickWindowPrivate::deliverMouseEvent qquickwindow.cpp 1310 0x443a07a 101 QQuickWindow::mouseReleaseEvent qquickwindow.cpp 1343 0x443a165 102 QQuickMenuPopupWindow::mouseReleaseEvent qquickmenupopupwindow.cpp 208 0x66786c73 103 QWindow::event qwindow.cpp 1842 0x17fb1cf5 104 QQuickWindow::event qquickwindow.cpp 1211 0x4439a1a 105 QApplicationPrivate::notify_helper qapplication.cpp 3455 0x97ddaf1 106 QApplication::notify qapplication.cpp 2876 0x97db5b4 107 QCoreApplication::notifyInternal qcoreapplication.cpp 871 0x6b90a8d6 108 QCoreApplication::sendSpontaneousEvent qcoreapplication.h 235 0x18239305 109 QGuiApplicationPrivate::processMouseEvent qguiapplication.cpp 1439 0x17faa447 110 QGuiApplicationPrivate::processWindowSystemEvent qguiapplication.cpp 1262 0x17fa9c2d 111 QWindowSystemInterface::sendWindowSystemEventsImplementation qwindowsysteminterface.cpp 581 0x17fa0760 112 QWindowSystemInterface::sendWindowSystemEvents qwindowsysteminterface.cpp 561 0x17fa06ed 113 QWindowsGuiEventDispatcher::sendPostedEvents qwindowsguieventdispatcher.cpp 86 0x6285ca79 114 qt_internal_proc qeventdispatcher_win.cpp 429 0x6b9502fc 115 USER32!DestroyCaret C:\WINDOWS\SysWOW64\user32.dll 0x755077d8 116 ?? 0x1806be 117 ?? 0x401 118 ??
Attachments
Issue Links
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- Closed
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