[kde] [Bug 363194] New: KDenLive Crashes When Deleting Effect or Transition

via KDE Bugzilla bugzilla_noreply at kde.org
Wed May 18 02:15:11 BST 2016 

https://bugs.kde.org/show_bug.cgi?id=363194

            Bug ID: 363194
           Summary: KDenLive Crashes When Deleting Effect or Transition
           Product: kde
           Version: unspecified
          Platform: unspecified
                OS: Linux
            Status: UNCONFIRMED
          Keywords: drkonqi
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: bryanworsley at hotmail.com

Application: kdenlive (16.07.70)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-22-generic x86_64
Distribution: Ubuntu 16.04 LTS

-- Information about the crash:
KDenLive crashes when attempting to delete an applied Effect or Transition.
Happens everytime and with all Effects.

The crash can be reproduced every time.

-- Backtrace:
Application: Kdenlive (kdenlive), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f07371158c0 (LWP 1999))]

Thread 21 (Thread 0x7f0723423700 (LWP 2000)):
#0  0x00007f0730786e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f072b36dc62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f072b36f8d7 in xcb_wait_for_event () from
/usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f0725de5629 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f073119984e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f072f0936fa in start_thread (arg=0x7f0723423700) at
pthread_create.c:333
#6  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 20 (Thread 0x7f06ff21b700 (LWP 2001)):
#0  0x00007f0730786e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f070628b64c in ?? () from /lib/x86_64-linux-gnu/libusb-1.0.so.0
#2  0x00007f072f0936fa in start_thread (arg=0x7f06ff21b700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 19 (Thread 0x7f06fb5ed700 (LWP 2002)):
#0  0x00007f0730786e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f072d65631c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f072d65642c in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f07313d0a9b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0731377dea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f07311948a4 in QThread::exec() () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0731f4d3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f073119984e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f072f0936fa in start_thread (arg=0x7f06fb5ed700) at
pthread_create.c:333
#9  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 18 (Thread 0x7f06f9c43700 (LWP 2004)):
#0  0x00007f0730786e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f072d65631c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f072d65642c in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f07313d0a9b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0731377dea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f07311948a4 in QThread::exec() () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0731f4d3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f073119984e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f072f0936fa in start_thread (arg=0x7f06f9c43700) at
pthread_create.c:333
#9  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 17 (Thread 0x7f06b7fff700 (LWP 2016)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f073119aaeb in QWaitCondition::wait(QMutex*, unsigned long) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f073578a92e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#3  0x00007f073578b1b3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f073119984e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f072f0936fa in start_thread (arg=0x7f06b7fff700) at
pthread_create.c:333
#6  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 16 (Thread 0x7f06b77fe700 (LWP 2017)):
#0  0x00007f0730786e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f072d65631c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f072d65642c in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f07313d0a9b in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0731377dea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f07311948a4 in QThread::exec() () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f073119984e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f072f0936fa in start_thread (arg=0x7f06b77fe700) at
pthread_create.c:333
#8  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 15 (Thread 0x7f06d7bab700 (LWP 2018)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06d7bab700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 14 (Thread 0x7f06e14ab700 (LWP 2019)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06e14ab700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 13 (Thread 0x7f06d73aa700 (LWP 2020)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06d73aa700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 12 (Thread 0x7f06d5999700 (LWP 2021)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06d5999700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 11 (Thread 0x7f06e55fb700 (LWP 2022)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06e55fb700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f06e4dfa700 (LWP 2023)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06e4dfa700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f06e45f9700 (LWP 2024)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06e45f9700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f06db023700 (LWP 2029)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06db023700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f06da822700 (LWP 2030)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06da822700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f06da021700 (LWP 2031)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06da021700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f06d9820700 (LWP 2032)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06d9820700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f06d901f700 (LWP 2033)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06d901f700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f06d881e700 (LWP 2034)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06d881e700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f06d699b700 (LWP 2035)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f071317f63e in ?? () from
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007f072f0936fa in start_thread (arg=0x7f06d699b700) at
pthread_create.c:333
#3  0x00007f0730792b5d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f07371158c0 (LWP 1999)):
[KCrash Handler]
#6  QString::QString (other=..., this=<synthetic pointer>) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:877
#7  Track::removeEffect (this=0x48caf90, start=start at entry=0,
effectIndex=effectIndex at entry=1, updateIndex=updateIndex at entry=true) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/src/timeline/track.cpp:973
#8  0x0000000000551279 in CustomTrackView::deleteEffect (this=0x58f9830,
track=5, pos=..., effect=...) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/src/timeline/customtrackview.cpp:2106
#9  0x00000000005a2bf3 in AddEffectCommand::redo (this=0x5eab3e0) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/src/timeline/timelinecommands.cpp:62
#10 0x00007f0732cd2bc8 in QUndoStack::push(QUndoCommand*) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#11 0x0000000000555579 in CustomTrackView::slotDeleteEffect
(this=this at entry=0x58f9830, clip=<optimized out>, track=<optimized out>,
effect=..., affectGroup=affectGroup at entry=true,
parentCommand=parentCommand at entry=0x0) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/src/timeline/customtrackview.cpp:2395
#12 0x000000000084fb3c in CustomTrackView::qt_static_metacall (_o=0x58f9830,
_c=<optimized out>, _id=<optimized out>, _a=0x7ffce62a38e0) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/obj-x86_64-linux-gnu/src/moc_customtrackview.cpp:586
#13 0x00007f07313a8fca in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x000000000082e065 in EffectStackView2::removeEffect
(this=this at entry=0x3f60680, _t1=0x5f5c8d0, _t2=_t2 at entry=-1, _t3=...) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/obj-x86_64-linux-gnu/src/moc_effectstackview2.cpp:550
#15 0x00000000005d9f01 in EffectStackView2::slotDeleteEffect (this=0x3f60680,
effect=...) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/src/effectstack/effectstackview2.cpp:814
#16 0x000000000084c4cd in EffectStackView2::qt_static_metacall (_o=0x3f60680,
_c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/obj-x86_64-linux-gnu/src/moc_effectstackview2.cpp:329
#17 0x00007f07313a8fca in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x000000000082d475 in CollapsibleEffect::deleteEffect (this=<optimized
out>, _t1=...) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/obj-x86_64-linux-gnu/src/moc_collapsibleeffect.cpp:394
#19 0x00000000005c951c in CollapsibleEffect::slotDeleteEffect (this=<optimized
out>) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/src/effectstack/collapsibleeffect.cpp:354
#20 0x000000000084b345 in CollapsibleEffect::qt_static_metacall (_o=0x5c02d70,
_c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/obj-x86_64-linux-gnu/src/moc_collapsibleeffect.cpp:220
#21 0x00007f07313a8fca in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f0732ce11b2 in QAbstractButton::clicked(bool) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f0732a43f04 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f0732a45519 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007f0732a45694 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) ()
from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007f0732b0a15a in QToolButton::mouseReleaseEvent(QMouseEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007f0732989f88 in QWidget::event(QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007f0732b0a239 in QToolButton::event(QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007f073294705c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007f073294cc19 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007f073137a62b in QCoreApplication::notifyInternal(QObject*, QEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f073294bb32 in QApplicationPrivate::sendMouseEvent(QWidget*,
QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#33 0x00007f07329a457b in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007f07329a6b3b in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007f073294705c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#36 0x00007f073294c516 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#37 0x00007f073137a62b in QCoreApplication::notifyInternal(QObject*, QEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007f07316be521 in
QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#39 0x00007f07316c01e5 in
QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#40 0x00007f07316a3f38 in
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
() from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#41 0x00007f0725e16f10 in ?? () from
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#42 0x00007f072d656127 in g_main_context_dispatch () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007f072d656380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007f072d65642c in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#45 0x00007f07313d0a7f in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#46 0x00007f0731377dea in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#47 0x00007f073137fe8c in QCoreApplication::exec() () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#48 0x00000000004866c2 in main (argc=1, argv=<optimized out>) at
/build/kdenlive-Qxkqrp/kdenlive-16.07.70+git201605171917~ubuntu16.04.1/src/main.cpp:130

Reported using DrKonqi

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