Bug 464023

Summary: Stuck in KToolBarPrivate::init
Product: [Frameworks and Libraries] frameworks-kxmlgui Reporter: Dāvis <davispuh>
Component: generalAssignee: kdelibs bugs <kdelibs-bugs>
Status: RESOLVED WORKSFORME    
Severity: normal CC: christoph
Priority: NOR    
Version: 5.101.0   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Dāvis 2023-01-08 21:32:56 UTC 
SUMMARY

Got this weird deadlock for Konsole

```
Thread 7 (Thread 0x7fbfa5bfe6c0 (LWP 1889) "konsole:shlo0"):
#0  0x00007fbfb4e9c4b6 in ?? () from /usr/lib/libc.so.6
#1  0x00007fbfb4e9ecd0 in pthread_cond_wait () from /usr/lib/libc.so.6
#2  0x00007fbfa650c50e in ?? () from /usr/lib/dri/radeonsi_dri.so
#3  0x00007fbfa64bc89c in ?? () from /usr/lib/dri/radeonsi_dri.so
#4  0x00007fbfa650c43c in ?? () from /usr/lib/dri/radeonsi_dri.so
#5  0x00007fbfb4e9f8fd in ?? () from /usr/lib/libc.so.6
#6  0x00007fbfb4f21a60 in ?? () from /usr/lib/libc.so.6

Thread 6 (Thread 0x7fbfa63ff6c0 (LWP 1888) "konsole:sh0"):
#0  0x00007fbfb4e9c4b6 in ?? () from /usr/lib/libc.so.6
#1  0x00007fbfb4e9ecd0 in pthread_cond_wait () from /usr/lib/libc.so.6
#2  0x00007fbfa650c50e in ?? () from /usr/lib/dri/radeonsi_dri.so
#3  0x00007fbfa64bc89c in ?? () from /usr/lib/dri/radeonsi_dri.so
#4  0x00007fbfa650c43c in ?? () from /usr/lib/dri/radeonsi_dri.so
#5  0x00007fbfb4e9f8fd in ?? () from /usr/lib/libc.so.6
#6  0x00007fbfb4f21a60 in ?? () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7fbfacaaa6c0 (LWP 1887) "konsole:disk$0"):
#0  0x00007fbfb4e9c4b6 in ?? () from /usr/lib/libc.so.6
#1  0x00007fbfb4e9ecd0 in pthread_cond_wait () from /usr/lib/libc.so.6
#2  0x00007fbfa650c50e in ?? () from /usr/lib/dri/radeonsi_dri.so
#3  0x00007fbfa64bc89c in ?? () from /usr/lib/dri/radeonsi_dri.so
#4  0x00007fbfa650c43c in ?? () from /usr/lib/dri/radeonsi_dri.so
#5  0x00007fbfb4e9f8fd in ?? () from /usr/lib/libc.so.6
#6  0x00007fbfb4f21a60 in ?? () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7fbfad3ec6c0 (LWP 1886) "konsole:cs0"):
#0  0x00007fbfb4e9c4b6 in ?? () from /usr/lib/libc.so.6
#1  0x00007fbfb4e9ecd0 in pthread_cond_wait () from /usr/lib/libc.so.6
#2  0x00007fbfa650c50e in ?? () from /usr/lib/dri/radeonsi_dri.so
#3  0x00007fbfa64bc89c in ?? () from /usr/lib/dri/radeonsi_dri.so
#4  0x00007fbfa650c43c in ?? () from /usr/lib/dri/radeonsi_dri.so
#5  0x00007fbfb4e9f8fd in ?? () from /usr/lib/libc.so.6
#6  0x00007fbfb4f21a60 in ?? () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7fbfae3976c0 (LWP 1885) "QXcbEventQueue"):
#0  0x00007fbfb4f140bf in poll () from /usr/lib/libc.so.6
#1  0x00007fbfb32ed26b in ?? () from /usr/lib/libxcb.so.1
#2  0x00007fbfb32eed1d in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007fbfaf1f5232 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007fbfb54e431a in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007fbfb4e9f8fd in ?? () from /usr/lib/libc.so.6
#6  0x00007fbfb4f21a60 in ?? () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7fbfaeb986c0 (LWP 1884) "QDBusConnection"):
#0  0x00007fbfb44cf6ec in ?? () from /usr/lib/libQt5DBus.so.5
#1  0x00007fbfb1109c49 in ?? () from /usr/lib/libdbus-1.so.3
#2  0x00007fbfb44d9bbd in ?? () from /usr/lib/libQt5DBus.so.5
#3  0x00007fbfb56b0b76 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#4  0x00007fbfb568cf7c in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#5  0x00007fbfb56d74d3 in QTimerInfoList::activateTimers() () from /usr/lib/libQt5Core.so.5
#6  0x00007fbfb56d7b12 in ?? () from /usr/lib/libQt5Core.so.5
#7  0x00007fbfb35df87b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#8  0x00007fbfb3636c89 in ?? () from /usr/lib/libglib-2.0.so.0
#9  0x00007fbfb35de132 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#10 0x00007fbfb56d7c8c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fbfb568574c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#12 0x00007fbfb54e724f in QThread::exec() () from /usr/lib/libQt5Core.so.5
#13 0x00007fbfb44dbcba in ?? () from /usr/lib/libQt5DBus.so.5
#14 0x00007fbfb54e431a in ?? () from /usr/lib/libQt5Core.so.5
#15 0x00007fbfb4e9f8fd in ?? () from /usr/lib/libc.so.6
#16 0x00007fbfb4f21a60 in ?? () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7fbfaf824ac0 (LWP 1882) "konsole"):
#0  0x00007fbfb4f197fd in syscall () from /usr/lib/libc.so.6
#1  0x00007fbfb54e057c in QSemaphore::acquire(int) () from /usr/lib/libQt5Core.so.5
#2  0x00007fbfb56bdb94 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fbfb44dceba in ?? () from /usr/lib/libQt5DBus.so.5
#4  0x00007fbfb44d5250 in QDBusConnection::connect(QString const&, QString const&, QString const&, QString const&, QStringList const&, QString const&, QObject*, char const*) () from /usr/lib/libQt5DBus.so.5
#5  0x00007fbfb44d535e in QDBusConnection::connect(QString const&, QString const&, QString const&, QString const&, QObject*, char const*) () from /usr/lib/libQt5DBus.so.5
#6  0x00007fbfb6a5b5c7 in KToolBarPrivate::init (this=0x5619d03d80c0, readConfig=<optimized out>, _isMainToolBar=<optimized out>) at /usr/src/debug/kxmlgui-git/kxmlgui/src/ktoolbar.cpp:269
#7  0x00007fbfb6a5bc15 in KToolBar::KToolBar (this=0x5619d036c720, objectName=..., parent=0x5619c319f060, readConfig=<optimized out>) at /usr/src/debug/kxmlgui-git/kxmlgui/src/ktoolbar.cpp:871
#8  0x00007fbfb6a649ea in KXMLGUIBuilder::createContainer (this=0x5619c319f098, parent=0x0, index=0, element=..., containerAction=@0x7ffc61288b28: 0x0) at /usr/include/c++/12.2.0/bits/unique_ptr.h:191
#9  0x00007fbfb6a747ee in KXMLGUI::BuildHelper::createContainer (this=this@entry=0x7ffc61288c90, parent=0x0, index=0, element=..., containerAction=@0x7ffc61288b28: 0x0, builder=builder@entry=0x7ffc61288b30) at /usr/src/debug/kxmlgui-git/kxmlgui/src/kxmlguifactory_p.cpp:772
#10 0x00007fbfb6a77548 in KXMLGUI::BuildHelper::processContainerElement (this=0x7ffc61288c90, e=..., tag=..., name=...) at /usr/src/debug/kxmlgui-git/kxmlgui/src/kxmlguifactory_p.cpp:703
#11 0x00007fbfb6a77cc5 in KXMLGUI::BuildHelper::processElement (this=0x7ffc61288c90, e=...) at /usr/src/debug/kxmlgui-git/kxmlgui/src/kxmlguifactory_p.cpp:509
#12 0x00007fbfb6a77dc4 in KXMLGUI::BuildHelper::build (this=this@entry=0x7ffc61288c90, element=...) at /usr/src/debug/kxmlgui-git/kxmlgui/src/kxmlguifactory_p.cpp:495
#13 0x00007fbfb6a71686 in KXMLGUIFactory::addClient (this=0x5619c3495840, client=0x5619c3800688) at /usr/src/debug/kxmlgui-git/kxmlgui/src/kxmlguifactory.cpp:260
#14 0x00007fbfb6c977e1 in Konsole::MainWindow::activeViewChanged(Konsole::SessionController*) () from /usr/lib/libkonsoleapp.so.1
#15 0x00007fbfb56bda91 in ?? () from /usr/lib/libQt5Core.so.5
#16 0x00007fbfb6b24ae7 in Konsole::ViewManager::activeViewChanged(Konsole::SessionController*) () from /usr/lib/libkonsoleprivate.so.1
#17 0x00007fbfb56bda91 in ?? () from /usr/lib/libQt5Core.so.5
#18 0x00007fbfb6bc0b84 in Konsole::SessionController::viewFocused(Konsole::SessionController*) () from /usr/lib/libkonsoleprivate.so.1
#19 0x00007fbfb6bd0411 in Konsole::SessionController::viewFocusChangeHandler(bool) () from /usr/lib/libkonsoleprivate.so.1
#20 0x00007fbfb56bda91 in ?? () from /usr/lib/libQt5Core.so.5
#21 0x00007fbfb6b255c7 in Konsole::TerminalDisplay::compositeFocusChanged(bool) () from /usr/lib/libkonsoleprivate.so.1
#22 0x00007fbfb56bda91 in ?? () from /usr/lib/libQt5Core.so.5
#23 0x00007fbfb6b978d2 in ?? () from /usr/lib/libkonsoleprivate.so.1
#24 0x00007fbfb568cc02 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#25 0x00007fbfb6378b4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#26 0x00007fbfb568cf98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#27 0x00007fbfb6374bec in QApplicationPrivate::setFocusWidget(QWidget*, Qt::FocusReason) () from /usr/lib/libQt5Widgets.so.5
#28 0x00007fbfb63a97f7 in QWidget::setFocus(Qt::FocusReason) () from /usr/lib/libQt5Widgets.so.5
#29 0x00007fbfb6399b7f in QStackedLayout::setCurrentIndex(int) () from /usr/lib/libQt5Widgets.so.5
#30 0x00007fbfb654c29a in ?? () from /usr/lib/libQt5Widgets.so.5
#31 0x00007fbfb56bdc40 in ?? () from /usr/lib/libQt5Core.so.5
#32 0x00007fbfb652bbe3 in QTabBar::currentChanged(int) () from /usr/lib/libQt5Widgets.so.5
#33 0x00007fbfb56bda91 in ?? () from /usr/lib/libQt5Core.so.5
#34 0x00007fbfb636bec7 in QAction::triggered(bool) () from /usr/lib/libQt5Widgets.so.5
#35 0x00007fbfb63718c7 in QAction::activate(QAction::ActionEvent) () from /usr/lib/libQt5Widgets.so.5
#36 0x00007fbfb637198e in QAction::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#37 0x00007fbfb6378b5c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#38 0x00007fbfb568cf98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#39 0x00007fbfb5b7401d in QShortcutMap::dispatchEvent(QKeyEvent*) () from /usr/lib/libQt5Gui.so.5
#40 0x00007fbfb5b6a887 in QShortcutMap::tryShortcut(QKeyEvent*) () from /usr/lib/libQt5Gui.so.5
#41 0x00007fbfb5b2a038 in QWindowSystemInterface::handleShortcutEvent(QWindow*, unsigned long, int, QFlags<Qt::KeyboardModifier>, unsigned int, unsigned int, unsigned int, QString const&, bool, unsigned short) () from /usr/lib/libQt5Gui.so.5
#42 0x00007fbfb5b3f9f2 in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) () from /usr/lib/libQt5Gui.so.5
#43 0x00007fbfb5b28885 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#44 0x00007fbfaf1f78b0 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#45 0x00007fbfb35df87b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#46 0x00007fbfb3636c89 in ?? () from /usr/lib/libglib-2.0.so.0
#47 0x00007fbfb35de132 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#48 0x00007fbfb56d7c8c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#49 0x00007fbfb568574c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#50 0x00007fbfb5690269 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#51 0x00005619c2702b65 in ?? ()
#52 0x00007fbfb4e3c290 in ?? () from /usr/lib/libc.so.6
#53 0x00007fbfb4e3c34a in __libc_start_main () from /usr/lib/libc.so.6
#54 0x00005619c2703425 in ?? ()
```

It seems to be related with a lot of notification spam as I printed binary file with bells :D
Also might be QDBusConnection bug as seems it got stuck there

https://github.com/qt/qtbase/blob/v5.15.8-lts-lgpl/src/dbus/qdbusintegrator.cpp#L1594

```
} else if (objThread != QThread::currentThread()) {
            // looped-back message, targeting another thread:
            // synchronize with it
            postEventToThread(HandleObjectCallPostEventAction, result.obj,
                              new QDBusActivateObjectEvent(QDBusConnection(this), this, result,
                                                           usedLength, msg, &sem));
            semWait = true;
```

OBSERVED RESULT

Konsole got stuck and didn't repaint window and didn't respond in any way

EXPECTED RESULT

To be responsive

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.102.0
Qt Version: 5.15.8
Comment 1 Christoph Cullmann 2024-12-15 17:51:47 UTC 
Can not reproduce this, could you try with a Qt 6 based release? Thanks!
Comment 2 Bug Janitor Service 2024-12-30 03:47:17 UTC 
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!
Comment 3 Bug Janitor Service 2025-01-14 03:47:50 UTC 
🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.