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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.15.8, 6.2.3, 6.3.0 Alpha
Affects Version/s: 5.15.2
Component/s: Widgets: Widgets and Dialogs
Labels:
- reported_by_support_standard
Environment:
Only tested Windows and MacOS, only tested Qt 5.15.2

Platform/s:

macOS, Windows
Commits:
9a131b59ee561e300fb6078886a85dd7b3c53599 (qt/qtbase/dev) 17119981db28378ec9c9d5465e5d46894fc02a86 (qt/tqtc-qtbase/5.15) cdc8b1bf2562a5706340559a12d4333e039584e5 (qt/qtbase/6.2)

Description

When adding an application font and showing a QFontComboBox, it will crash on exit.

Looks like on ~QGuiApplication it cleans up the application fonts and then emits a signal to update all the QFontComboBox, but they're deleted or getting deleted at the same time and it causes a crash.

Stack:

1  QWidget::isActiveWindow() const                          qwidget.cpp                            6662 0x10016962d    
2  QStyleOption::init(QWidget const *)                      qstyleoption.cpp                       197  0x1001aa07c    
3  QStyleOption::initFrom(QWidget const *)                  qstyleoption.h                         107  0x100233c7d    
4  QComboBox::initStyleOption(QStyleOptionComboBox *) const qcombobox.cpp                          1277 0x100233c72    
5  QComboBoxPrivate::updateLineEditGeometry()               qcombobox.cpp                          1304 0x100233ef4    
6  QComboBoxPrivate::setCurrentIndex(QModelIndex const&)    qcombobox.cpp                          2322 0x10023447a    
7  QComboBox::setCurrentIndex(int)                          qcombobox.cpp                          2288 0x100233a38    
8  QFontComboBoxPrivate::_q_updateModel()                   qfontcombobox.cpp                      365  0x1002668f5    
9  void doActivate<false>(QObject *, int, void * *)         qobject.cpp                            3898 0x1010100d5    
10 QFontDatabase::removeAllApplicationFonts()               qfontdatabase.cpp                      2623 0x10086682b    
11 QGuiApplication::~QGuiApplication()                      qguiapplication.cpp                    698  0x10078e160    
12 QApplication::~QApplication()                            qapplication.cpp                       771  0x1001343d0    
13 main                                                     main.cpp                               16   0x100003902    
14 start                                                    (x86_64) /usr/lib/system/libdyld.dylib      0x7fff203b7f3d 
15 start                                                    (x86_64) /usr/lib/system/libdyld.dylib      0x7fff203b7f3d

I joined a repro app with a

{ttf}

file, but it doesn't look like it's needed to actually load the file in order to get the crash.