Bug 364278

Summary: kdenlive crashes whilst starting
Product: [Applications] kdenlive Reporter: Frits Spieker <fresh.road1272>
Component: User Interface & MiscellaneousAssignee: Unassigned bugs <unassigned-bugs-null>
Status: RESOLVED FIXED    
Severity: crash CC: jamie.marchant, jb, sisit-ton, snd.noise, wegwerf-1-2-3
Priority: NOR Keywords: drkonqi
Version First Reported In: 16.04.0   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: New crash information added by DrKonqi

Description Frits Spieker 2016-06-13 18:04:45 UTC 
Application: kdenlive (16.04.2)

Qt Version: 5.6.0
Frameworks Version: 5.22.0
Operating System: Linux 4.6.1-1-default x86_64
Distribution: "openSUSE Tumbleweed (20160422) (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed: clean desktop, simply try to start kdenlive. Crashes every time. Clean installation of Opensuse Tumbleweed (re-installed yesterday) to see if that woulf fix things.

The crash can be reproduced every time.

-- Backtrace:
Application: Kdenlive (kdenlive), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f6fcf48e8c0 (LWP 29920))]

Thread 6 (Thread 0x7f6fb8e7d700 (LWP 29921)):
#0  0x00007f6fc76bc9cd in poll () from /lib64/libc.so.6
#1  0x00007f6fc1b353f2 in ?? () from /usr/lib64/libxcb.so.1
#2  0x00007f6fc1b37147 in xcb_wait_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007f6fbb3dd969 in QXcbEventReader::run (this=0x2b10540) at qxcbconnection.cpp:1325
#4  0x00007f6fc80b6b29 in QThreadPrivate::start (arg=0x2b10540) at thread/qthread_unix.cpp:340
#5  0x00007f6fc5dc5454 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f6fc76c53fd in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f6fb32a7700 (LWP 29922)):
#0  0x00007f6fc4174754 in g_mutex_unlock () from /usr/lib64/libglib-2.0.so.0
#1  0x00007f6fc41304ce in g_main_context_acquire () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f6fc41312c5 in ?? () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f6fc41314fc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007f6fc82ccc5b in QEventDispatcherGlib::processEvents (this=0x7f6fac0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007f6fc827879a in QEventLoop::exec (this=this@entry=0x7f6fb32a6ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f6fc80b1f2c in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f6fc9c8b7b5 in ?? () from /usr/lib64/libQt5DBus.so.5
#8  0x00007f6fc80b6b29 in QThreadPrivate::start (arg=0x7f6fc9efad00) at thread/qthread_unix.cpp:340
#9  0x00007f6fc5dc5454 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f6fc76c53fd in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f6f93f5d700 (LWP 29923)):
#0  0x00007ffce5d72a50 in clock_gettime ()
#1  0x00007f6fc76d2086 in clock_gettime () from /lib64/libc.so.6
#2  0x00007f6fc815ddf6 in qt_clock_gettime (ts=0x7f6f93f5ca90, clock=<optimized out>) at tools/qelapsedtimer_unix.cpp:105
#3  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:156
#4  qt_gettime () at tools/qelapsedtimer_unix.cpp:165
#5  0x00007f6fc82ca919 in QTimerInfoList::updateCurrentTime (this=this@entry=0x7f6f8c002cd0) at kernel/qtimerinfo_unix.cpp:84
#6  0x00007f6fc82cae45 in QTimerInfoList::timerWait (this=0x7f6f8c002cd0, tm=...) at kernel/qtimerinfo_unix.cpp:381
#7  0x00007f6fc82cc1be in timerSourcePrepareHelper (timeout=0x7f6f93f5cb44, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:126
#8  timerSourcePrepare (source=<optimized out>, timeout=0x7f6f93f5cb44) at kernel/qeventdispatcher_glib.cpp:159
#9  0x00007f6fc4130a1d in g_main_context_prepare () from /usr/lib64/libglib-2.0.so.0
#10 0x00007f6fc4131323 in ?? () from /usr/lib64/libglib-2.0.so.0
#11 0x00007f6fc41314fc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#12 0x00007f6fc82ccc5b in QEventDispatcherGlib::processEvents (this=0x7f6f8c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#13 0x00007f6fc827879a in QEventLoop::exec (this=this@entry=0x7f6f93f5ccf0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#14 0x00007f6fc80b1f2c in QThread::exec (this=this@entry=0x51ec490) at thread/qthread.cpp:503
#15 0x00007f6fc945ef35 in QQmlThreadPrivate::run (this=0x51ec490) at /usr/src/debug/qtdeclarative-opensource-src-5.6.0/src/qml/qml/ftw/qqmlthread.cpp:141
#16 0x00007f6fc80b6b29 in QThreadPrivate::start (arg=0x51ec490) at thread/qthread_unix.cpp:340
#17 0x00007f6fc5dc5454 in start_thread () from /lib64/libpthread.so.0
#18 0x00007f6fc76c53fd in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f6f9207a700 (LWP 29925)):
#0  0x00007f6fc76bc9cd in poll () from /lib64/libc.so.6
#1  0x00007f6fc41313f4 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f6fc41314fc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f6fc82ccc5b in QEventDispatcherGlib::processEvents (this=0x7f6f880008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#4  0x00007f6fc827879a in QEventLoop::exec (this=this@entry=0x7f6f92079cf0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f6fc80b1f2c in QThread::exec (this=this@entry=0x3996430) at thread/qthread.cpp:503
#6  0x00007f6fc945ef35 in QQmlThreadPrivate::run (this=0x3996430) at /usr/src/debug/qtdeclarative-opensource-src-5.6.0/src/qml/qml/ftw/qqmlthread.cpp:141
#7  0x00007f6fc80b6b29 in QThreadPrivate::start (arg=0x3996430) at thread/qthread_unix.cpp:340
#8  0x00007f6fc5dc5454 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f6fc76c53fd in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f6f83fff700 (LWP 29928)):
#0  0x00007f6fc4130c52 in g_main_context_query () from /usr/lib64/libglib-2.0.so.0
#1  0x00007f6fc413136f in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f6fc41314fc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f6fc82ccc5b in QEventDispatcherGlib::processEvents (this=0x7f6f7c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#4  0x00007f6fc827879a in QEventLoop::exec (this=this@entry=0x7f6f83ffed10, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f6fc80b1f2c in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f6fc80b6b29 in QThreadPrivate::start (arg=0x81f1600) at thread/qthread_unix.cpp:340
#7  0x00007f6fc5dc5454 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f6fc76c53fd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f6fcf48e8c0 (LWP 29920)):
[KCrash Handler]
#6  QOpenGLContext::shareGroup (this=this@entry=0x0) at kernel/qopenglcontext.cpp:1106
#7  0x00007f6fc8aa6424 in QOpenGLMultiGroupSharedResource::value<QOpenGLFunctionsPrivateEx> (context=0x0, this=<optimized out>) at ../../src/gui/kernel/qopenglcontext_p.h:165
#8  qt_gl_functions (context=context@entry=0x0) at opengl/qopenglfunctions.cpp:223
#9  0x00007f6fc8aa65eb in QOpenGLFunctions::initializeOpenGLFunctions (this=this@entry=0x4853b18) at opengl/qopenglfunctions.cpp:573
#10 0x00000000006d8196 in GLWidget::initializeGL (this=0x4853af0) at /usr/src/debug/kdenlive-16.04.2/src/monitor/glwidget.cpp:153
#11 0x000000000080fffd in GLWidget::qt_static_metacall (_o=_o@entry=0x4853af0, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=26, _a=_a@entry=0x7ffce5d4e2f0) at /usr/src/debug/kdenlive-16.04.2/build/src/moc_glwidget.cpp:233
#12 0x00007f6fc82a57a0 in QMetaObject::activate (sender=0x4853af0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x0) at kernel/qobject.cpp:3730
#13 0x00007f6fc82a6077 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7f6fcdbce260 <QQuickWindow::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x0) at kernel/qobject.cpp:3595
#14 0x00007f6fcd7a5453 in QQuickWindow::sceneGraphInitialized (this=<optimized out>) at .moc/moc_qquickwindow.cpp:464
#15 0x00007f6fcd7a9a3d in QQuickWindow::qt_static_metacall (_o=_o@entry=0x4853af0, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=2, _a=_a@entry=0x7ffce5d4e460) at .moc/moc_qquickwindow.cpp:228
#16 0x00007f6fc82a57a0 in QMetaObject::activate (sender=sender@entry=0x3b60f20, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3730
#17 0x00007f6fc82a6077 in QMetaObject::activate (sender=sender@entry=0x3b60f20, m=m@entry=0x7f6fcdbdae60 <QSGRenderContext::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3595
#18 0x00007f6fcd8d0640 in QSGRenderContext::initialized (this=this@entry=0x3b60f20) at .moc/moc_qsgcontext_p.cpp:145
#19 0x00007f6fcd764b31 in QSGRenderContext::initialize (this=0x3b60f20, context=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.6.0/src/quick/scenegraph/qsgcontext.cpp:637
#20 0x00007f6fcd77ac7f in QSGGuiThreadRenderLoop::renderWindow (this=this@entry=0x3b61220, window=0x4853af0) at /usr/src/debug/qtdeclarative-opensource-src-5.6.0/src/quick/scenegraph/qsgrenderloop.cpp:357
#21 0x00007f6fcd77b630 in QSGGuiThreadRenderLoop::exposureChanged (this=0x3b61220, window=0x4853af0) at /usr/src/debug/qtdeclarative-opensource-src-5.6.0/src/quick/scenegraph/qsgrenderloop.cpp:441
#22 0x00007f6fc87d728b in QWindow::event (this=this@entry=0x4853af0, ev=ev@entry=0x7ffce5d4e9b0) at kernel/qwindow.cpp:2096
#23 0x00007f6fcd7b2ed5 in QQuickWindow::event (this=0x4853af0, e=0x7ffce5d4e9b0) at /usr/src/debug/qtdeclarative-opensource-src-5.6.0/src/quick/items/qquickwindow.cpp:1473
#24 0x00007f6fca05e91c in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x4853af0, e=0x7ffce5d4e9b0) at kernel/qapplication.cpp:3714
#25 0x00007f6fca0637d6 in QApplication::notify (this=0x7ffce5d4ed60, receiver=0x4853af0, e=0x7ffce5d4e9b0) at kernel/qapplication.cpp:3495
#26 0x00007f6fc827a8b8 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x4853af0, event=event@entry=0x7ffce5d4e9b0) at kernel/qcoreapplication.cpp:1015
#27 0x00007f6fc87cdaf7 in QCoreApplication::sendSpontaneousEvent (event=0x7ffce5d4e9b0, receiver=0x4853af0) at ../../src/corelib/kernel/qcoreapplication.h:230
#28 QGuiApplicationPrivate::processExposeEvent (e=0x439ea30) at kernel/qguiapplication.cpp:2732
#29 0x00007f6fc87ce5fd in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x439ea30) at kernel/qguiapplication.cpp:1714
#30 0x00007f6fc87acffb in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:645
#31 0x00007f6fbb411a10 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#32 0x00007f6fc4131227 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#33 0x00007f6fc4131458 in ?? () from /usr/lib64/libglib-2.0.so.0
#34 0x00007f6fc41314fc in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#35 0x00007f6fc82ccc3f in QEventDispatcherGlib::processEvents (this=0x2b2fa70, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#36 0x00007f6fc827879a in QEventLoop::exec (this=this@entry=0x7ffce5d4ec60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#37 0x00007f6fc8280a6d in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1285
#38 0x00007f6fc87c48ec in QGuiApplication::exec () at kernel/qguiapplication.cpp:1598
#39 0x00007f6fca05bbd5 in QApplication::exec () at kernel/qapplication.cpp:2973
#40 0x000000000048b54a in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kdenlive-16.04.2/src/main.cpp:130

Reported using DrKonqi
Comment 1 farid 2016-06-22 04:14:42 UTC 
This could be related to movit. Do you have gpu processing on? See here:

https://bugs.kde.org/show_bug.cgi?id=364552
Comment 2 Frits Spieker 2016-06-22 15:10:28 UTC 
Not that I know. It is a clean install and the application crashes the very moment I try to start it. (So I do not even get a chance to click anywhere in the screen).
Comment 3 Frits Spieker 2016-06-22 15:17:39 UTC 
OK. This is weird. I went into the software manager (Yast) to see if there were other version lying around. I downgraded to version 16.04.1-1.1 (from 16.04.2-1.2) and it auto-installed dvbgrab (I think) and now it works. 

I also tested what happens when I go back again to 16.04.2-1.2 and the result is that it crashes immediately on start-up.

Are there any other log-files I can send to help?
Comment 4 farid 2016-06-22 15:46:19 UTC 
Just one more thing, which version of MLT do you have installed?
Comment 5 Frits Spieker 2016-06-23 15:13:22 UTC 
6.2.0-70.4
Comment 6 Jean-Baptiste Mardelle 2016-06-23 19:50:53 UTC 
Some of the OpenGL changes I made in git master were backported to the 16.04.2 version and I guess this is the reason for your crash. The problem is that OpenGL's is highly tied to the graphic card / driver that you are using. So depending on your hardware/driver config, things might work or crash... Not sure how to handle this issue.

Can you tell us which graphic card / drivers you are using ?
Comment 7 farid 2016-06-25 00:17:51 UTC 
Hmmmm, on my notebook and a crash happens while on the desktop it doesn't. This *could* be since my desktop has an nvidia card while the notebook doesn't have a dedicated graphics card. Maybe have kdenlive detect if there is a gpu before starting otherwise disable movit support.

Here is the backtrace:

(gdb) run
Starting program: /usr/bin/kdenlive 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffdb38d700 (LWP 6548)]
[New Thread 0x7fffd222d700 (LWP 6549)]
[New Thread 0x7fffd1a2c700 (LWP 6550)]
[New Thread 0x7fffcbfff700 (LWP 6551)]
mlt_repository_init: failed to dlopen /usr/lib/mlt/libmltsox.so
  (libsox.so.3: cannot open shared object file: Arquivo ou diretório não encontrado)
[New Thread 0x7fffaddae700 (LWP 6552)]
[New Thread 0x7fffacdad700 (LWP 6553)]
[New Thread 0x7fffa7dfc700 (LWP 6554)]
Removing cache at "/home/farid/.cache/kdenlive-thumbs.kcache"
[producer_xml] failed to load transition "frei0r.cairoblend"
[producer_xml] failed to load transition "frei0r.cairoblend"
OpenGL vendor:  "Intel Open Source Technology Center"
OpenGL renderer:  "Mesa DRI Intel(R) Ironlake Mobile "
OpenGL ARG_SYNC:  true
OpenGL OpenGLES:  false
[New Thread 0x7fffa5e1d700 (LWP 6555)]

Thread 1 "kdenlive" received signal SIGSEGV, Segmentation fault.
0x00007ffff0db5f50 in QOpenGLContext::shareGroup() const () from /usr/lib/libQt5Gui.so.5


(gdb) backtrace
#0  0x00007ffff0db5f50 in QOpenGLContext::shareGroup() const () from /usr/lib/libQt5Gui.so.5
#1  0x00007ffff106ae19 in QOpenGLFunctions::initializeOpenGLFunctions() () from /usr/lib/libQt5Gui.so.5
#2  0x0000000000702c86 in ?? ()
#3  0x0000000000865f25 in ?? ()
#4  0x00007ffff08584e9 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff6052625 in ?? () from /usr/lib/libQt5Quick.so.5
#6  0x00007ffff08584e9 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/libQt5Core.so.5
#7  0x00007ffff60092e1 in QSGRenderContext::initialize(QOpenGLContext*) ()
   from /usr/lib/libQt5Quick.so.5
#8  0x00007ffff602035f in ?? () from /usr/lib/libQt5Quick.so.5
#9  0x00007ffff6020ae8 in ?? () from /usr/lib/libQt5Quick.so.5
#10 0x00007ffff0d86e45 in QWindow::event(QEvent*) () from /usr/lib/libQt5Gui.so.5
#11 0x00007ffff605c933 in QQuickWindow::event(QEvent*) () from /usr/lib/libQt5Quick.so.5
#12 0x00007ffff1875e3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#13 0x00007ffff187d5b1 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#14 0x00007ffff082cc80 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/libQt5Core.so.5
#15 0x00007ffff0d7c0cd in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () from /usr/lib/libQt5Gui.so.5
#16 0x00007ffff0d7ccdd in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#17 0x00007ffff0d5acbb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEvent---Type <return> to continue, or q <return> to quit---
sFlag>) () from /usr/lib/libQt5Gui.so.5
#18 0x00007fffdcce8310 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#19 0x00007fffe7c8bdd7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#20 0x00007fffe7c8c040 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0x00007fffe7c8c0ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#22 0x00007ffff088157f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#23 0x00007ffff082b0da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#24 0x00007ffff08335cc in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#25 0x0000000000486802 in ?? ()
#26 0x00007fffefb9a741 in __libc_start_main () from /usr/lib/libc.so.6
#27 0x0000000000486e69 in _start ()
Comment 8 farid 2016-06-25 02:37:12 UTC 
a more detailed backtrace in case it helps:

(gdb) run
Starting program: /usr/bin/kdenlive 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffdb38d700 (LWP 20010)]
[New Thread 0x7fffd222d700 (LWP 20011)]
[New Thread 0x7fffd1a2c700 (LWP 20012)]
[New Thread 0x7fffcbfff700 (LWP 20013)]
[New Thread 0x7fffaa4b5700 (LWP 20017)]
[New Thread 0x7fff9fadf700 (LWP 20021)]
[New Thread 0x7fff9eade700 (LWP 20022)]
[New Thread 0x7fff9dbf9700 (LWP 20023)]
Removing cache at "/home/farid/.cache/kdenlive-thumbs.kcache"
OpenGL vendor:  "Intel Open Source Technology Center"
OpenGL renderer:  "Mesa DRI Intel(R) Ironlake Mobile "
OpenGL ARG_SYNC:  true
OpenGL OpenGLES:  false
[New Thread 0x7fff8fa35700 (LWP 20024)]

Thread 1 "kdenlive" received signal SIGSEGV, Segmentation fault.
0x00007ffff0db5f50 in QOpenGLContext::shareGroup() const () from /usr/lib/libQt5Gui.so.5
(gdb) thread apply all bt

Thread 10 (Thread 0x7fff8fa35700 (LWP 20024)):
#0  0x00007fffefc586cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7c8bfd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7c8c0ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff088159b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#4  0x00007ffff082b0da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff064e0f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ffff0652d78 in ?? () from /usr/lib/libQt5Core.so.5
#7  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#8  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

Thread 9 (Thread 0x7fff9dbf9700 (LWP 20023)):
#0  0x00007fffefc586cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7c8bfd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7c8c0ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff088157f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#4  0x00007ffff082b0da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff064e0f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ffff2248445 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007ffff0652d78 in ?? () from /usr/lib/libQt5Core.so.5
---Type <return> to continue, or q <return> to quit---
#8  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

Thread 8 (Thread 0x7fff9eade700 (LWP 20022)):
#0  0x00007fffee123458 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007ffff0653b66 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQt5Core.so.5
#2  0x00007ffff064f274 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007ffff0652d78 in ?? () from /usr/lib/libQt5Core.so.5
#4  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#5  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

Thread 7 (Thread 0x7fff9fadf700 (LWP 20021)):
#0  0x00007fffefc586cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7c8bfd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7c8c0ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff088157f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#4  0x00007ffff082b0da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff064e0f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ffff2248445 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007ffff0652d78 in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

---Type <return> to continue, or q <return> to quit---
Thread 6 (Thread 0x7fffaa4b5700 (LWP 20017)):
#0  0x00007fffefc586cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffb084fcbc in ?? () from /usr/lib/libusb-1.0.so.0
#2  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#3  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7fffcbfff700 (LWP 20013)):
#0  0x00007fffefc586cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7c8bfd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7c8c0ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff088159b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#4  0x00007ffff082b0da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff064e0f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ffff2cdee75 in ?? () from /usr/lib/libQt5DBus.so.5
#7  0x00007ffff0652d78 in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7fffd1a2c700 (LWP 20012)):
#0  0x00007fffefc586cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7c8bfd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7c8c362 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#3  0x00007fffd81b4726 in ?? () from /usr/lib/libgio-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#4  0x00007fffe7cb22b5 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7fffd222d700 (LWP 20011)):
#0  0x00007fffefc586cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7c8bfd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7c8c0ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fffe7c8c131 in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007fffe7cb22b5 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7fffdb38d700 (LWP 20010)):
#0  0x00007fffefc586cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe73c78e0 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007fffe73c9679 in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007fffdccb2469 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007ffff0652d78 in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007fffee11d484 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fffefc616dd in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7ffff7ec7800 (LWP 20006)):
#0  0x00007ffff0db5f50 in QOpenGLContext::shareGroup() const () from /usr/lib/libQt5Gui.so.5
#1  0x00007ffff106ae19 in QOpenGLFunctions::initializeOpenGLFunctions() () from /usr/lib/libQt5Gui.so.5
---Type <return> to continue, or q <return> to quit---

#2  0x0000000000702806 in GLWidget::initializeGL (this=0x25e50c0)
    at /home/farid/abs/kdenlive/src/kdenlive-16.04.2/src/monitor/glwidget.cpp:153
#3  0x0000000000865ad5 in GLWidget::qt_static_metacall (_o=0x25e50c0, _c=<optimized out>, 
    _id=<optimized out>, _a=<optimized out>)
    at /home/farid/abs/kdenlive/src/build/src/moc_glwidget.cpp:233
#4  0x00007ffff08584e9 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff6052625 in ?? () from /usr/lib/libQt5Quick.so.5
#6  0x00007ffff08584e9 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/libQt5Core.so.5
#7  0x00007ffff60092e1 in QSGRenderContext::initialize(QOpenGLContext*) ()
   from /usr/lib/libQt5Quick.so.5
#8  0x00007ffff602035f in ?? () from /usr/lib/libQt5Quick.so.5
#9  0x00007ffff6020ae8 in ?? () from /usr/lib/libQt5Quick.so.5
#10 0x00007ffff0d86e45 in QWindow::event(QEvent*) () from /usr/lib/libQt5Gui.so.5
#11 0x00007ffff605c933 in QQuickWindow::event(QEvent*) () from /usr/lib/libQt5Quick.so.5
#12 0x00007ffff1875e3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#13 0x00007ffff187d5b1 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#14 0x00007ffff082cc80 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/libQt5Core.so.5
#15 0x00007ffff0d7c0cd in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () from /usr/lib/libQt5Gui.so.5
#16 0x00007ffff0d7ccdd in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
---Type <return> to continue, or q <return> to quit---
#17 0x00007ffff0d5acbb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#18 0x00007fffdcce8310 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#19 0x00007fffe7c8bdd7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#20 0x00007fffe7c8c040 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0x00007fffe7c8c0ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#22 0x00007ffff088157f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#23 0x00007ffff082b0da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#24 0x00007ffff08335cc in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#25 0x0000000000486802 in main (argc=<optimized out>, argv=<optimized out>)
    at /home/farid/abs/kdenlive/src/kdenlive-16.04.2/src/main.cpp:130
Comment 9 Frits Spieker 2016-06-25 14:05:24 UTC 
Hi,

Farid might be on to something. I do not have a dedicated graphics card in my PC. I just use the embedded graphics from the Intel processor (i915)

Does this help?
OpenGL vendor string:                   Intel Open Source Technology Center
OpenGL renderer string:                 Mesa DRI Intel(R) Ivybridge Desktop 
OpenGL version string:                  3.3 (Core Profile) Mesa 11.2.2
OpenGL shading language version string: 3.30
Driver:                                 Intel
GPU class:                              IvyBridge
OpenGL version:                         3.3
GLSL version:                           3.30
Mesa version:                           11.2.2
X server version:                       1.18.3
Linux kernel version:                   4.6.2
Requires strict binding:                yes
GLSL shaders:                           yes
Texture NPOT support:                   yes
Comment 10 farid 2016-06-25 18:07:51 UTC 
I have also tested today's git build and also got the crash... can't further test on my laptop. I can do more tests on monday on the desktop.

(gdb) run
Starting program: /usr/bin/kdenlive 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffdb5a2700 (LWP 5304)]
[New Thread 0x7fffd2430700 (LWP 5305)]
[New Thread 0x7fffd1c2f700 (LWP 5306)]
[New Thread 0x7fffcbfff700 (LWP 5307)]
[New Thread 0x7fffaa6bb700 (LWP 5308)]
[New Thread 0x7fff9fce5700 (LWP 5328)]
[New Thread 0x7fff9ece4700 (LWP 5330)]
[New Thread 0x7fff9ddff700 (LWP 5331)]
"This is an untested development version. Always backup your data"
Removing cache at "/home/farid/.cache/kdenlive-thumbs.kcache"
[New Thread 0x7fff8bd99700 (LWP 5341)]
[Thread 0x7fff8bd99700 (LWP 5341) exited]
[New Thread 0x7fff8bd99700 (LWP 5342)]
[Thread 0x7fff8bd99700 (LWP 5342) exited]
[New Thread 0x7fff8bd99700 (LWP 5343)]
[New Thread 0x7fff8a26d700 (LWP 5344)]
klauncher not running... launching kdeinit
[New Thread 0x7fff891fa700 (LWP 5349)]
[New Thread 0x7fff889f9700 (LWP 5350)]
[New Thread 0x7fff7bdf0700 (LWP 5352)]
[New Thread 0x7fff7b5ef700 (LWP 5353)]
[New Thread 0x7fff7adee700 (LWP 5354)]
[New Thread 0x7fff7a5ed700 (LWP 5357)]
OpenGL vendor:  "Intel Open Source Technology Center"
OpenGL renderer:  "Mesa DRI Intel(R) Ironlake Mobile "
OpenGL Threaded:  false
OpenGL ARG_SYNC:  true
OpenGL OpenGLES:  false
[New Thread 0x7fff79a34700 (LWP 5360)]

Thread 1 "kdenlive" received signal SIGSEGV, Segmentation fault.
0x00007ffff0fcaf50 in QOpenGLContext::shareGroup() const () from /usr/lib/libQt5Gui.so.5
(gdb) thread apply all b
Display all 200 possibilities? (y or n)
(gdb) thread apply all bt

Thread 20 (Thread 0x7fff79a34700 (LWP 5360)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7ea0fd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7ea10ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff0a9659b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#4  0x00007ffff0a400da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff08630f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ffff0867d78 in ?? () from /usr/lib/libQt5Core.so.5
#7  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#8  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 19 (Thread 0x7fff7a5ed700 (LWP 5357)):
#0  0x00007fffefe72269 in syscall () from /usr/lib/libc.so.6
#1  0x00007fffe7ee52aa in g_cond_wait_until () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7e75a19 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007fffe7e7603c in g_async_queue_timeout_pop () from /usr/lib/libglib-2.0.so.0
#4  0x00007fffe7ec7d7d in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
#6  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#7  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 18 (Thread 0x7fff7adee700 (LWP 5354)):
---Type <return> to continue, or q <return> to quit---
#0  0x00007fffee338097 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007fffe7a32798 in pa_threaded_mainloop_wait () from /usr/lib/libpulse.so.0

#2  0x00007fff9c04db22 in ?? () from /usr/lib/gstreamer-1.0/libgstpulse.so
#3  0x00007fffe505a00d in ?? () from /usr/lib/libgstaudio-1.0.so.0
#4  0x00007fffe5769247 in ?? () from /usr/lib/libgstbase-1.0.so.0
#5  0x00007fffe576a690 in ?? () from /usr/lib/libgstbase-1.0.so.0
#6  0x00007fffe5c1f697 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#7  0x00007fffe5c276a2 in gst_pad_push () from /usr/lib/libgstreamer-1.0.so.0
#8  0x00007fffe5774610 in ?? () from /usr/lib/libgstbase-1.0.so.0
#9  0x00007fffe5c1f697 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#10 0x00007fffe5c276a2 in gst_pad_push () from /usr/lib/libgstreamer-1.0.so.0
#11 0x00007fffe5774610 in ?? () from /usr/lib/libgstbase-1.0.so.0
#12 0x00007fffe5c1f697 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#13 0x00007fffe5c276a2 in gst_pad_push () from /usr/lib/libgstreamer-1.0.so.0
#14 0x00007fffe5774610 in ?? () from /usr/lib/libgstbase-1.0.so.0
#15 0x00007fffe5c1f697 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#16 0x00007fffe5c276a2 in gst_pad_push () from /usr/lib/libgstreamer-1.0.so.0
#17 0x00007fff8a91195e in ?? () from /usr/lib/gstreamer-1.0/libgstcoreelements.so
#18 0x00007fffe5c52131 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#19 0x00007fffe7ec7cae in ?? () from /usr/lib/libglib-2.0.so.0
#20 0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#22 0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 17 (Thread 0x7fff7b5ef700 (LWP 5353)):
---Type <return> to continue, or q <return> to quit---
#0  0x00007fffefe72269 in syscall () from /usr/lib/libc.so.6
#1  0x00007fffe7ee518f in g_cond_wait () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe5c5231d in ?? () from /usr/lib/libgstreamer-1.0.so.0
#3  0x00007fffe7ec7cae in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 16 (Thread 0x7fff7bdf0700 (LWP 5352)):
#0  0x00007fffefe72269 in syscall () from /usr/lib/libc.so.6
#1  0x00007fffe7ee518f in g_cond_wait () from /usr/lib/libglib-2.0.so.0
#2  0x00007fff8a911fb6 in ?? () from /usr/lib/gstreamer-1.0/libgstcoreelements.so
#3  0x00007fffe5c1f697 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#4  0x00007fffe5c276a2 in gst_pad_push () from /usr/lib/libgstreamer-1.0.so.0
#5  0x00007fffe5c1056b in gst_proxy_pad_chain_default () from /usr/lib/libgstreamer-1.0.so.0
#6  0x00007fffe5c1f697 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#7  0x00007fffe5c276a2 in gst_pad_push () from /usr/lib/libgstreamer-1.0.so.0
#8  0x00007fff8a91ffba in ?? () from /usr/lib/gstreamer-1.0/libgstcoreelements.so
#9  0x00007fff8a920479 in ?? () from /usr/lib/gstreamer-1.0/libgstcoreelements.so
#10 0x00007fffe5c1f697 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#11 0x00007fffe5c276a2 in gst_pad_push () from /usr/lib/libgstreamer-1.0.so.0
#12 0x00007fff8a91195e in ?? () from /usr/lib/gstreamer-1.0/libgstcoreelements.so
#13 0x00007fffe5c52131 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#14 0x00007fffe7ec7cae in ?? () from /usr/lib/libglib-2.0.so.0
#15 0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#16 0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#17 0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 15 (Thread 0x7fff889f9700 (LWP 5350)):
#0  0x00007fffefe72269 in syscall () from /usr/lib/libc.so.6
#1  0x00007fffe7ee518f in g_cond_wait () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe5784002 in ?? () from /usr/lib/libgstbase-1.0.so.0
#3  0x00007fffe5785320 in gst_data_queue_pop () from /usr/lib/libgstbase-1.0.so.0
#4  0x00007fff8a90d545 in ?? () from /usr/lib/gstreamer-1.0/libgstcoreelements.so
#5  0x00007fffe5c52131 in ?? () from /usr/lib/libgstreamer-1.0.so.0
#6  0x00007fffe7ec7cae in ?? () from /usr/lib/libglib-2.0.so.0
#7  0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 14 (Thread 0x7fff891fa700 (LWP 5349)):
#0  0x00007fffefe72269 in syscall () from /usr/lib/libc.so.6
#1  0x00007fffe7ee518f in g_cond_wait () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe5c5231d in ?? () from /usr/lib/libgstreamer-1.0.so.0
#3  0x00007fffe7ec7cae in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 13 (Thread 0x7fff8a26d700 (LWP 5344)):
---Type <return> to continue, or q <return> to quit---
#0  0x00007fffefe72269 in syscall () from /usr/lib/libc.so.6
#1  0x00007fffe7ee518f in g_cond_wait () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe5c5231d in ?? () from /usr/lib/libgstreamer-1.0.so.0
#3  0x00007fffe7ec7cae in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 12 (Thread 0x7fff8bd99700 (LWP 5343)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7a321b1 in ?? () from /usr/lib/libpulse.so.0
#2  0x00007fffe7a23761 in pa_mainloop_poll () from /usr/lib/libpulse.so.0
#3  0x00007fffe7a23dfe in pa_mainloop_iterate () from /usr/lib/libpulse.so.0
#4  0x00007fffe7a23eb0 in pa_mainloop_run () from /usr/lib/libpulse.so.0
#5  0x00007fffe7a320f9 in ?? () from /usr/lib/libpulse.so.0
#6  0x00007fffdf448b08 in ?? () from /usr/lib/pulseaudio/libpulsecommon-8.0.so
#7  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#8  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 9 (Thread 0x7fff9ddff700 (LWP 5331)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7ea0fd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7ea10ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff0a9657f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
---Type <return> to continue, or q <return> to quit---
#4  0x00007ffff0a400da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff08630f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ffff245d445 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007ffff0867d78 in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 8 (Thread 0x7fff9ece4700 (LWP 5330)):
#0  0x00007fffee338458 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007ffff0868b66 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQt5Core.so.5
#2  0x00007ffff0864274 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007ffff0867d78 in ?? () from /usr/lib/libQt5Core.so.5
#4  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#5  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 7 (Thread 0x7fff9fce5700 (LWP 5328)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7ea0fd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7ea10ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff0a9657f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#4  0x00007ffff0a400da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff08630f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
---Type <return> to continue, or q <return> to quit---
#6  0x00007ffff245d445 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007ffff0867d78 in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 6 (Thread 0x7fffaa6bb700 (LWP 5308)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffb0a55cbc in ?? () from /usr/lib/libusb-1.0.so.0
#2  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#3  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7fffcbfff700 (LWP 5307)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7ea0fd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7ea10ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff0a9659b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#4  0x00007ffff0a400da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff08630f3 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007ffff2ef3e75 in ?? () from /usr/lib/libQt5DBus.so.5
#7  0x00007ffff0867d78 in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

---Type <return> to continue, or q <return> to quit---
Thread 4 (Thread 0x7fffd1c2f700 (LWP 5306)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7ea0fd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7ea1362 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#3  0x00007fffd83c9726 in ?? () from /usr/lib/libgio-2.0.so.0
#4  0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7fffd2430700 (LWP 5305)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe7ea0fd6 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe7ea10ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fffe7ea1131 in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007fffe7ec72b5 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7fffdb5a2700 (LWP 5304)):
#0  0x00007fffefe6d6cd in poll () from /usr/lib/libc.so.6
#1  0x00007fffe75dc8e0 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007fffe75de679 in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007fffdcec7469 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007ffff0867d78 in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007fffee332484 in start_thread () from /usr/lib/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#6  0x00007fffefe766dd in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7ffff7ec8800 (LWP 5300)):
#0  0x00007ffff0fcaf50 in QOpenGLContext::shareGroup() const () from /usr/lib/libQt5Gui.so.5
#1  0x00007ffff127fe19 in QOpenGLFunctions::initializeOpenGLFunctions() () from /usr/lib/libQt5Gui.so.5
#2  0x00000000007346a6 in GLWidget::initializeGL (this=0x15840c0)
    at /tmp/yaourt-tmp-farid/aur-kdenlive-git/src/kdenlive/src/monitor/glwidget.cpp:154
#3  0x000000000089a805 in GLWidget::qt_static_metacall (_o=0x15840c0, _c=<optimized out>, 
    _id=<optimized out>, _a=<optimized out>)
    at /tmp/yaourt-tmp-farid/aur-kdenlive-git/src/build/src/moc_glwidget.cpp:236
#4  0x00007ffff0a6d4e9 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/libQt5Core.so.5
#5  0x00007ffff6267625 in ?? () from /usr/lib/libQt5Quick.so.5
#6  0x00007ffff0a6d4e9 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/libQt5Core.so.5
#7  0x00007ffff621e2e1 in QSGRenderContext::initialize(QOpenGLContext*) ()
   from /usr/lib/libQt5Quick.so.5
#8  0x00007ffff623535f in ?? () from /usr/lib/libQt5Quick.so.5
#9  0x00007ffff6235ae8 in ?? () from /usr/lib/libQt5Quick.so.5
#10 0x00007ffff0f9be45 in QWindow::event(QEvent*) () from /usr/lib/libQt5Gui.so.5
#11 0x00007ffff6271933 in QQuickWindow::event(QEvent*) () from /usr/lib/libQt5Quick.so.5
#12 0x00007ffff1a8ae3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQt5Widgets.so.5
#13 0x00007ffff1a925b1 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#14 0x00007ffff0a41c80 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/libQt5Core.so.5
#15 0x00007ffff0f910cd in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () from /usr/lib/libQt5Gui.so.5
#16 0x00007ffff0f91cdd in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#17 0x00007ffff0f6fcbb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#18 0x00007fffdcefd310 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#19 0x00007fffe7ea0dd7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#20 0x00007fffe7ea1040 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0x00007fffe7ea10ec in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#22 0x00007ffff0a9657f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#23 0x00007ffff0a400da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#24 0x00007ffff0a485cc in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#25 0x00000000004891a2 in main (argc=<optimized out>, argv=<optimized out>)
    at /tmp/yaourt-tmp-farid/aur-kdenlive-git/src/kdenlive/src/main.cpp:136
Comment 11 Jean-Baptiste Mardelle 2016-06-25 21:06:08 UTC 
Git commit 778ab830174e91d163159cafaa200e2bbc873862 by Jean-Baptiste Mardelle.
Committed on 25/06/2016 at 21:02.
Pushed by mardelle into branch 'Applications/16.04'.

Revert OpenGL change that might cause startup crash on some config

M  +2    -2    src/monitor/glwidget.cpp

http://commits.kde.org/kdenlive/778ab830174e91d163159cafaa200e2bbc873862
Comment 12 Jean-Baptiste Mardelle 2016-06-25 21:07:03 UTC 
Git commit 1d92a6e7435fd3979bf2c8216802ee9a9c253f56 by Jean-Baptiste Mardelle.
Committed on 25/06/2016 at 21:06.
Pushed by mardelle into branch 'master'.

Revert OpenGL change that might cause startup crash on some config

M  +2    -2    src/monitor/glwidget.cpp

http://commits.kde.org/kdenlive/1d92a6e7435fd3979bf2c8216802ee9a9c253f56
Comment 13 farid 2016-06-25 21:46:00 UTC 
Thanks JB, I had already deleted my .config/kdenliverc file and had managed to get it started without crashing. 

Cheers
Comment 14 Frits Spieker 2016-08-05 04:04:55 UTC 
Hi. I can confirm that all is well again. Thanks.
Comment 15 jamie marchant 2016-09-26 20:24:51 UTC 
*** Bug 369294 has been marked as a duplicate of this bug. ***
Comment 16 sisit 2021-08-25 15:10:57 UTC 
Created attachment 141035 [details]
New crash information added by DrKonqi

kdenlive (20.04.2) using Qt 5.12.7

- What I was doing when the application crashed:

It crashes every time I open Kdenlive.
I try deleting the config folder but nothing help.

-- Backtrace (Reduced):
#4  QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> >::operator->() const (this=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:118
[...]
#7  QOpenGLContext::makeCurrent(QSurface*) (this=0x0, surface=0x2f72508) at kernel/qopenglcontext.cpp:963
#8  0x000000000079dcca in GLWidget::initializeGL() ()
#9  0x00007feebaa25fcf in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffe67e06cc0, r=0x2f72350, this=0x4744e70) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:394
[...]
#12 0x00007feebe8a6993 in QQuickWindow::sceneGraphInitialized() (this=<optimized out>) at .moc/moc_qquickwindow.cpp:502