Bug 394367

Summary: Can't Add Taskbar Widgets while running Synergy-Core as Server
Product: [Plasma] plasmashell Reporter: Ryan Erwin <ryanerwin>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DOWNSTREAM    
Severity: crash CC: notmart, plasma-bugs-null
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.12.5   
Target Milestone: 1.0   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Ryan Erwin 2018-05-17 11:27:54 UTC 
Application: plasmashell (5.12.5)

Qt Version: 5.10.1
Frameworks Version: 5.46.0
Operating System: Linux 4.16.8-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
On this system, I was running synergy-core --server, with one client attached.
When I click on the taskbar "menu" button or the "add widget" button Plasma freezes.
Using `pkill5 plasmashell` then does not exit cause plasmashell to exit...
Must use `pkill -11 plasmashell`

I did this twice. However, after terminating both `plasmashell` and `synergy-core`, the widget menu is still freezing up plasmashell...

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f66a234e800 (LWP 4291))]

Thread 10 (Thread 0x7f65bffff700 (LWP 5287)):
#0  0x00007f669b867934 in read () at /usr/lib/libc.so.6
#1  0x00007f6696103ed1 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f66960bdff8 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f66960be4c6 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f66960be63e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f669c1bc254 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f669c15e31b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f669bf6d71e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f669f14c319 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f669bf72abd in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f65c4bf1700 (LWP 4713)):
#0  0x00007f66960bb330 in  () at /usr/lib/libglib-2.0.so.0
#1  0x00007f66960bd983 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007f66960be44e in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f66960be63e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f669c1bc254 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f669c15e31b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f669bf6d71e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f669bf72abd in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f65cd416700 (LWP 4712)):
#0  0x00007f66960e6f40 in g_thread_self () at /usr/lib/libglib-2.0.so.0
#1  0x00007f66960be62f in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#2  0x00007f669c1bc254 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f669c15e31b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f669bf6d71e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f669bf72abd in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f65ec67f700 (LWP 4367)):
#0  0x00007f66961052f4 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f66960bdf1a in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#2  0x00007f66960be4c6 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f66960be63e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f669c1bc254 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f669c15e31b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f669bf6d71e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f669fcf550b in  () at /usr/lib/libQt5Quick.so.5
#8  0x00007f669bf72abd in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f6677fff700 (LWP 4364)):
#0  0x00007f669b12affc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f66a1a11f77 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f66a1a11fb9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f6682365700 (LWP 4361)):
#0  0x00007f66961052d9 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f66960be421 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f66960be63e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f669c1bc254 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f669c15e31b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f669bf6d71e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f669f14c319 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007f669bf72abd in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f6683dfa700 (LWP 4351)):
#0  0x00007f669b867934 in read () at /usr/lib/libc.so.6
#1  0x00007f6696103ed1 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f66960bdff8 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f66960be4c6 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f66960be63e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f669c1bc254 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f669c15e31b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f669bf6d71e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f669f14c319 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f669bf72abd in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f66898f5700 (LWP 4315)):
#0  0x00007f669c1bc114 in  () at /usr/lib/libQt5Core.so.5
#1  0x00007f66960bda49 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#2  0x00007f66960be44e in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f66960be63e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f669c1bc254 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f669c15e31b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f669bf6d71e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f669c5df416 in  () at /usr/lib/libQt5DBus.so.5
#8  0x00007f669bf72abd in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f668bcdc700 (LWP 4305)):
#0  0x00007f669b12affc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f66a0939393 in  () at /usr/lib/libxcb.so.1
#2  0x00007f66a093ae4b in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f668e46282a in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f669bf72abd in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f669b125075 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f669b87653f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f66a234e800 (LWP 4291)):
[KCrash Handler]
#6  0x00007f669b86bea9 in poll () at /usr/lib/libc.so.6
#7  0x00007f66a0939180 in  () at /usr/lib/libxcb.so.1
#8  0x00007f66a093af3b in xcb_wait_for_special_event () at /usr/lib/libxcb.so.1
#9  0x00007f66775dfa5e in glPrimitiveBoundingBox () at /usr/lib/libGLX_mesa.so.0
#10 0x00007f66775e0288 in glPrimitiveBoundingBox () at /usr/lib/libGLX_mesa.so.0
#11 0x00007f66775e032b in glPrimitiveBoundingBox () at /usr/lib/libGLX_mesa.so.0
#12 0x00007f66775d498e in  () at /usr/lib/libGLX_mesa.so.0
#13 0x00007f66775cd499 in  () at /usr/lib/libGLX_mesa.so.0
#14 0x00007f66775d4dbf in  () at /usr/lib/libGLX_mesa.so.0
#15 0x00007f66775c0607 in  () at /usr/lib/libGLX_mesa.so.0
#16 0x00007f6693392e6d in  () at /usr/lib/libGLX.so.0
#17 0x00007f6693393895 in  () at /usr/lib/libGLX.so.0
#18 0x00007f6693394ed6 in  () at /usr/lib/libGLX.so.0
#19 0x00007f668aec5c30 in  () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
#20 0x00007f669c99b8c9 in QOpenGLContext::makeCurrent(QSurface*) () at /usr/lib/libQt5Gui.so.5
#21 0x00007f669fd5a5d8 in  () at /usr/lib/libQt5Quick.so.5
#22 0x00007f669fdd0252 in QQuickWindow::~QQuickWindow() () at /usr/lib/libQt5Quick.so.5
#23 0x00007f667444406f in  () at /usr/lib/qt/qml/org/kde/plasma/core/libcorebindingsplugin.so
#24 0x00007f669c18e14d in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#25 0x00007f669c197d1c in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#26 0x00007f669fdc1497 in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#27 0x00007f669fddee97 in  () at /usr/lib/libQt5Quick.so.5
#28 0x00007f669c191071 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#29 0x00007f669fdbe32c in QQuickItem::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#30 0x00007f669d167fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#31 0x00007f669d16f9c6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#32 0x00007f669c15fce0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#33 0x00007f669c162946 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#34 0x00007f669c1bcc44 in  () at /usr/lib/libQt5Core.so.5
#35 0x00007f66960be368 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#36 0x00007f66960be5b1 in  () at /usr/lib/libglib-2.0.so.0
#37 0x00007f66960be63e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#38 0x00007f669c1bc231 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#39 0x00007f668e4ea482 in  () at /usr/lib/libQt5XcbQpa.so.5
#40 0x00007f669c15e31b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#41 0x00007f669c167718 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#42 0x000055f98578a85a in  ()
#43 0x00007f669b7a106b in __libc_start_main () at /usr/lib/libc.so.6
#44 0x000055f98578ac1a in _start ()

Reported using DrKonqi
Comment 1 Marco Martin 2018-05-18 08:26:03 UTC 
this seems a bug in the opengl implementation
Comment 2 Christoph Feck 2018-06-06 19:59:07 UTC 
The crash is in GLX Mesa driver, and/or in libxcb. If you can reproduce it, please report it with debug symbol information directly to Mesa developers via https://bugs.freedesktop.org/