Bug 402975

Summary: Crash after Plasma just launches.
Product: [Plasma] plasmashell Reporter: broekhoff.jochem
Component: generic-crashAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED DUPLICATE    
Severity: crash CC: broekhoff.jochem, plasma-bugs
Priority: NOR Keywords: drkonqi
Version: 5.14.4   
Target Milestone: 1.0   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description broekhoff.jochem 2019-01-07 18:19:41 UTC 
Application: plasmashell (5.14.4)

Qt Version: 5.12.0
Frameworks Version: 5.53.0
Operating System: Linux 4.20.0-arch1-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
Just booting my computer. This crash doesn't happen often, just one in a while.
I can see the toolbar appearing for a split second, then everything disappears, the screen goes black and the mouse pointer looks like it's in an old or default style.
I'm always able to re-launch Plasma by hitting Alt+Spacebar (which does still work) and entering "kstart5 plasmashell".

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff2dced55c0 (LWP 866))]

Thread 10 (Thread 0x7ff29f815700 (LWP 1330)):
#0  0x00007ff2e151aafc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ff2e2613adc in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff2e2613bca in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff2e43564cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007ff2e435673c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#6  0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7ff2a5de6700 (LWP 1326)):
#0  0x00007ff2e22ecc21 in poll () at /usr/lib/libc.so.6
#1  0x00007ff2e05d5540 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff2e05d562e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ff2e281f5c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff2e27c858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ff2e260c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ff2a77be35a in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#7  0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7ff2b6ffe700 (LWP 1310)):
#0  0x00007ff2e22e87a4 in read () at /usr/lib/libc.so.6
#1  0x00007ff2e0583971 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff2e05d40b0 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007ff2e05d54e6 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007ff2e05d562e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007ff2e281f5c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007ff2e27c858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007ff2e260c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007ff2e42cee5b in  () at /usr/lib/libQt5Quick.so.5
#9  0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#10 0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7ff2bd3fd700 (LWP 1304)):
#0  0x00007ff2e151aafc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ff2e2613adc in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff2e2613bca in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff2e43564cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007ff2e435673c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#6  0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7ff2bfbff700 (LWP 1222)):
#0  0x00007ff2e151aafc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ff2e2613adc in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff2e2613bca in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff2e43564cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007ff2e435673c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#6  0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7ff2c79c9700 (LWP 1127)):
[KCrash Handler]
#6  0x00007ff2e26629c6 in qHash(QByteArray const&, unsigned int) () at /usr/lib/libQt5Core.so.5
#7  0x00007ff2e2f12a57 in  () at /usr/lib/libQt5Gui.so.5
#8  0x00007ff2e2f12e1c in  () at /usr/lib/libQt5Gui.so.5
#9  0x00007ff2e2f11f79 in  () at /usr/lib/libQt5Gui.so.5
#10 0x00007ff2e2ee212b in  () at /usr/lib/libQt5Gui.so.5
#11 0x00007ff2e2ee27ce in QOpenGLShaderProgram::link() () at /usr/lib/libQt5Gui.so.5
#12 0x00007ff2e4347d56 in QSGDefaultRenderContext::compileShader(QSGMaterialShader*, QSGMaterial*, char const*, char const*) () at /usr/lib/libQt5Quick.so.5
#13 0x00007ff2e43121e6 in  () at /usr/lib/libQt5Quick.so.5
#14 0x00007ff2e4312c01 in QSGBatchRenderer::Renderer::renderMergedBatch(QSGBatchRenderer::Batch const*) () at /usr/lib/libQt5Quick.so.5
#15 0x00007ff2e4313e06 in QSGBatchRenderer::Renderer::renderBatches() () at /usr/lib/libQt5Quick.so.5
#16 0x00007ff2e4319653 in QSGBatchRenderer::Renderer::render() () at /usr/lib/libQt5Quick.so.5
#17 0x00007ff2e4309a3e in QSGRenderer::renderScene(QSGBindable const&) () at /usr/lib/libQt5Quick.so.5
#18 0x00007ff2e4309f0c in QSGRenderer::renderScene(unsigned int) () at /usr/lib/libQt5Quick.so.5
#19 0x00007ff2e43471a0 in QSGDefaultRenderContext::renderNextFrame(QSGRenderer*, unsigned int) () at /usr/lib/libQt5Quick.so.5
#20 0x00007ff2e43ab085 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/libQt5Quick.so.5
#21 0x00007ff2e4352940 in  () at /usr/lib/libQt5Quick.so.5
#22 0x00007ff2e43566f8 in  () at /usr/lib/libQt5Quick.so.5
#23 0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#24 0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#25 0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7ff2d999d700 (LWP 956)):
#0  0x00007ff2e22ecc21 in poll () at /usr/lib/libc.so.6
#1  0x00007ff2e05d5540 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff2e05d562e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ff2e281f5c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff2e27c858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ff2e260c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ff2e4008b89 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7ff2dabae700 (LWP 930)):
#0  0x00007ff2e22ecc21 in poll () at /usr/lib/libc.so.6
#1  0x00007ff2e05d5540 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ff2e05d562e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ff2e281f5c4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff2e27c858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ff2e260c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ff2e30a6ba6 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7ff2dbfe7700 (LWP 915)):
#0  0x00007ff2e22ecc21 in poll () at /usr/lib/libc.so.6
#1  0x00007ff2e4747630 in  () at /usr/lib/libxcb.so.1
#2  0x00007ff2e47492db in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007ff2dcd6c96b in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007ff2e260d9cc in  () at /usr/lib/libQt5Core.so.5
#5  0x00007ff2e1514a9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ff2e22f7b23 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7ff2dced55c0 (LWP 866)):
#0  0x00007ff2e151aafc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ff2e2613adc in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff2e2613bca in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff2e43534c3 in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007ff2e43540da in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007ff2e43b73b6 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#6  0x00007ff2e3307e34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#7  0x00007ff2e330f671 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#8  0x00007ff2e27c98f9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#9  0x00007ff2e2b8fa88 in QPlatformWindow::windowEvent(QEvent*) () at /usr/lib/libQt5Gui.so.5
#10 0x00007ff2e330f774 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#11 0x00007ff2e27c98f9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007ff2e281e955 in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#13 0x00007ff2e281f21a in  () at /usr/lib/libQt5Core.so.5
#14 0x00007ff2e05d3a2f in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#15 0x00007ff2e05d55e9 in  () at /usr/lib/libglib-2.0.so.0
#16 0x00007ff2e05d562e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#17 0x00007ff2e281f5a9 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#18 0x00007ff2e27c858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007ff2e27d0896 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#20 0x000055ad95c9ed2e in  ()
#21 0x00007ff2e2220223 in __libc_start_main () at /usr/lib/libc.so.6
#22 0x000055ad95c9f1de in _start ()
[Inferior 1 (process 866) detached]

Reported using DrKonqi
Comment 1 David Edmundson 2019-01-07 18:24:50 UTC 
Can you run kcmshell5 qtquicksettings       

and set the render loop to "basic" and see if that changes anything?
Comment 2 broekhoff.jochem 2019-01-08 15:46:10 UTC 
(In reply to David Edmundson from comment #1)
> Can you run kcmshell5 qtquicksettings       
> 
> and set the render loop to "basic" and see if that changes anything?

I've changed the setting from "Automatic" to "Basic".
As I said, this crash doesn't happen that often, so I'll let you know if I notice anything.
Comment 3 broekhoff.jochem 2019-03-11 15:53:10 UTC 
After about two months of daily usage, I haven't experienced any crash with the render loop configured as "Basic".
Shall I reset the setting to "Automatic" and see if it crashes again?
Comment 4 Christoph Feck 2019-03-31 10:37:38 UTC 
Sure, the more evidence we have, the better.
Comment 5 broekhoff.jochem 2019-04-02 07:49:09 UTC 
All right, that's changed. I'll keep the issue updated.
Comment 6 Christoph Feck 2019-04-25 10:22:23 UTC 
If you have new information, please add a comment to the duplicate bug.

*** This bug has been marked as a duplicate of bug 384470 ***