Bug 485618

Summary:	plasmashell segfaults in BluezQt::PendingCall::finished() when Bluez hangs
Product:	[Frameworks and Libraries] frameworks-bluez-qt	Reporter:	mydarkstar <mds_foss>
Component:	general	Assignee:	kdelibs bugs <kdelibs-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	crash	Keywords:	drkonqi
Priority:	NOR
Version First Reported In:	6.0.0
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	New crash information added by DrKonqi

Description mydarkstar 2024-04-16 02:54:42 UTC

Application: plasmashell (6.0.3)

Qt Version: 6.6.3
Frameworks Version: 6.0.0
Operating System: Linux 6.6.21-273-tkg-linux-lts-tkg-bmq x86_64
Windowing System: Wayland
Distribution: Arch Linux
DrKonqi: 6.0.3 [CoredumpBackend]

-- Information about the crash:
I more or less accidentally clicked the "Enable Bluetooth" toggle in the Bluetooth applet while listening to music via Bluetooth.

The Bluetooth headphones got disconnected, but Plasma still showed them as connected, including a list of other devices, even though it showed the Bluetooth toggle as disabled.
Pipewire also continued to play the music via the disconnected device, which was visible in the Audio Volume applet.

When trying to restart `bluetooth.service` via systemctl, plasmashell promptly crashed.
`bluetooth.service` also would not stop when executing the restart command. I had to kill it.

The reporter is unsure if this crash is reproducible.

-- Backtrace (Reduced):
#5  0x000076d8b95b1629 in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlRefPointer<QQmlContextData> const&, QObject*, QV4::String*, QFlags<QV4::QObjectWrapper::Flag>, QV4::Value const&) () at /usr/lib/libQt6Qml.so.6
#6  0x000076d8b95a713a in QV4::QQmlContextWrapper::virtualPut(QV4::Managed*, QV4::PropertyKey, QV4::Value const&, QV4::Value*) () at /usr/lib/libQt6Qml.so.6
#7  0x000076d8b95332a3 in QV4::ExecutionContext::setProperty(QV4::String*, QV4::Value const&) () at /usr/lib/libQt6Qml.so.6
#8  0x000076d8b95cbdc5 in QV4::Runtime::StoreNameSloppy::call(QV4::ExecutionEngine*, int, QV4::Value const&) () at /usr/lib/libQt6Qml.so.6
#9  0x000076d8b95ff081 in ??? () at /usr/lib/libQt6Qml.so.6


Reported using DrKonqi

Comment 1 mydarkstar 2024-04-16 02:54:43 UTC

Created attachment 168575 [details]
New crash information added by DrKonqi

DrKonqi auto-attaching complete backtrace.

Comment 2 mydarkstar 2024-04-16 04:05:33 UTC

The following bug report for Plasma 5.27.7 seems relevant, with *disconnecting* a Bluetooth device:
https://bugs.kde.org/show_bug.cgi?id=474893

This bug report for Plasma 5.26.5 also *disconnects* a Bluetooth device:
https://bugs.kde.org/show_bug.cgi?id=465031

Lastly, this bug report for Plasma 6.0.1 seems similar, but with *connecting* a Bluetooth device:
https://bugs.kde.org/show_bug.cgi?id=482565

Comment 3 mydarkstar 2024-04-16 04:06:50 UTC

Thread 1 (Thread 0x76d8b35d01c0 (LWP 1695)):
[KCrash Handler]
#5  0x000076d8b95b1629 in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlRefPointer<QQmlContextData> const&, QObject*, QV4::String*, QFlags<QV4::QObjectWrapper::Flag>, QV4::Value const&) () at /usr/lib/libQt6Qml.so.6
#6  0x000076d8b95a713a in QV4::QQmlContextWrapper::virtualPut(QV4::Managed*, QV4::PropertyKey, QV4::Value const&, QV4::Value*) () at /usr/lib/libQt6Qml.so.6
#7  0x000076d8b95332a3 in QV4::ExecutionContext::setProperty(QV4::String*, QV4::Value const&) () at /usr/lib/libQt6Qml.so.6
#8  0x000076d8b95cbdc5 in QV4::Runtime::StoreNameSloppy::call(QV4::ExecutionEngine*, int, QV4::Value const&) () at /usr/lib/libQt6Qml.so.6
#9  0x000076d8b95ff081 in ??? () at /usr/lib/libQt6Qml.so.6
#10 0x000076d8b960da95 in ??? () at /usr/lib/libQt6Qml.so.6
#11 0x000076d8b9579af8 in ??? () at /usr/lib/libQt6Qml.so.6
#12 0x000076d8b95b1df7 in ??? () at /usr/lib/libQt6Qml.so.6
#13 0x000076d8b8591599 in ??? () at /usr/lib/libQt6Core.so.6
#14 0x000076d853e60d84 in BluezQt::PendingCall::finished(BluezQt::PendingCall*) () at /usr/lib/libKF6BluezQt.so.6
#15 0x000076d853e67488 in ??? () at /usr/lib/libKF6BluezQt.so.6
#16 0x000076d8b8591599 in ??? () at /usr/lib/libQt6Core.so.6
#17 0x000076d8b93bee90 in ??? () at /usr/lib/libQt6DBus.so.6
#18 0x000076d8b857cbb7 in QObject::event(QEvent*) () at /usr/lib/libQt6Core.so.6
#19 0x000076d8ba2f437b in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt6Widgets.so.6
#20 0x000076d8b853a198 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt6Core.so.6
#21 0x000076d8b853a51b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt6Core.so.6
#22 0x000076d8b8775ba4 in ??? () at /usr/lib/libQt6Core.so.6
#23 0x000076d8b7184199 in g_main_dispatch (context=0x76d8ac000f00) at ../glib/glib/gmain.c:3344
#24 0x000076d8b71e33bf in g_main_context_dispatch_unlocked (context=0x76d8ac000f00) at ../glib/glib/gmain.c:4152
#25 g_main_context_iterate_unlocked.isra.0 (context=context@entry=0x76d8ac000f00, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/glib/gmain.c:4217
#26 0x000076d8b7183712 in g_main_context_iteration (context=0x76d8ac000f00, may_block=1) at ../glib/glib/gmain.c:4282
#27 0x000076d8b8773cd4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#28 0x000076d8b85446ee in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#29 0x000076d8b853cc38 in QCoreApplication::exec() () at /usr/lib/libQt6Core.so.6
#30 0x000055fa14a58476 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma-workspace/plasma-workspace-6.0.3/shell/main.cpp:214

Comment 4 mydarkstar 2025-10-10 04:12:39 UTC

I haven't had this issue anymore on newer package versions.
Closing this as a duplicate.

*** This bug has been marked as a duplicate of bug 474893 ***