Application: gwenview (4.14.0 pre)
KDE Platform Version: 4.14.9
Qt Version: 4.8.6
Operating System: Linux 3.16.7-29-desktop x86_64
Distribution: "openSUSE 13.2 (Harlequin) (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:
gwenview crashed when pressing CONTROL L (for rotating) two times very fast. 
When pressing CONTROL L slowly several times then it always worked.
Problem only happened when file was loaded and there was no rotation before.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Gwenview (gwenview), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd239c90880 (LWP 2283))]

Thread 3 (Thread 0x7fd2215d9700 (LWP 2311)):
#0  0x00007fd2364e9c5d in poll () at /lib64/libc.so.6
#1  0x00007fd239913f20 in  () at /opt/lib/libmediaclient.so
#2  0x00007fd239914c62 in poll () at /opt/lib/libmediaclient.so
#3  0x00007fd231e23be4 in  () at /usr/lib64/libglib-2.0.so.0
#4  0x00007fd231e23cec in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#5  0x00007fd2389120de in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#6  0x00007fd2388e3e6f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#7  0x00007fd2388e4165 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#8  0x00007fd2387e10bf in QThread::exec() () at /usr/lib64/libQtCore.so.4
#9  0x00007fd2388c5783 in  () at /usr/lib64/libQtCore.so.4
#10 0x00007fd2387e379f in  () at /usr/lib64/libQtCore.so.4
#11 0x00007fd235dec0a4 in start_thread () at /lib64/libpthread.so.0
#12 0x00007fd2364f208d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7fd21bfff700 (LWP 2344)):
#0  0x00007fd235df0408 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007fd2387e3c64 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib64/libQtCore.so.4
#2  0x00007fd2387d77ba in  () at /usr/lib64/libQtCore.so.4
#3  0x00007fd2387e379f in  () at /usr/lib64/libQtCore.so.4
#4  0x00007fd235dec0a4 in start_thread () at /lib64/libpthread.so.0
#5  0x00007fd2364f208d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fd239c90880 (LWP 2283)):
[KCrash Handler]
#5  0x00007fd2388eb83e in QMetaObject::cast(QObject*) const () at /usr/lib64/libQtCore.so.4
#6  0x00007fd2393b913f in  () at /usr/lib64/libgwenviewlib.so.4
#7  0x00007fd2393ba7dd in Gwenview::Document::prepareDownSampledImageForZoom(double) () at /usr/lib64/libgwenviewlib.so.4
#8  0x00007fd2393f33fa in Gwenview::ImageScaler::doScale() () at /usr/lib64/libgwenviewlib.so.4
#9  0x00007fd2393d2e74 in Gwenview::RasterImageView::updateBuffer(QRegion const&) () at /usr/lib64/libgwenviewlib.so.4
#10 0x00007fd2393d2fb1 in Gwenview::RasterImageView::onZoomChanged() () at /usr/lib64/libgwenviewlib.so.4
#11 0x00007fd2393c4ff0 in  () at /usr/lib64/libgwenviewlib.so.4
#12 0x00007fd2393d2ba1 in Gwenview::RasterImageView::updateImageRect(QRect const&) () at /usr/lib64/libgwenviewlib.so.4
#13 0x00007fd2393d4839 in  () at /usr/lib64/libgwenviewlib.so.4
#14 0x00007fd2388f91fa in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () at /usr/lib64/libQtCore.so.4
#15 0x00007fd2393b7a95 in Gwenview::Document::imageRectUpdated(QRect const&) () at /usr/lib64/libgwenviewlib.so.4
#16 0x00007fd2388fd59e in QObject::event(QEvent*) () at /usr/lib64/libQtCore.so.4
#17 0x00007fd2371dd76c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQtGui.so.4
#18 0x00007fd2371e3cad in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQtGui.so.4
#19 0x00007fd237ef5e0a in KApplication::notify(QObject*, QEvent*) () at /usr/lib64/libkdeui.so.5
#20 0x00007fd2388e52ad in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQtCore.so.4
#21 0x00007fd2388e857d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQtCore.so.4
#22 0x00007fd2389128fe in  () at /usr/lib64/libQtCore.so.4
#23 0x00007fd231e23a04 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0
#24 0x00007fd231e23c48 in  () at /usr/lib64/libglib-2.0.so.0
#25 0x00007fd231e23cec in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#26 0x00007fd2389120be in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#27 0x00007fd23727a676 in  () at /usr/lib64/libQtGui.so.4
#28 0x00007fd2388e3e6f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#29 0x00007fd2388e4165 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQtCore.so.4
#30 0x00007fd2388e95b9 in QCoreApplication::exec() () at /usr/lib64/libQtCore.so.4
#31 0x0000000000429ded in  ()
#32 0x00007fd23642eb05 in __libc_start_main () at /lib64/libc.so.6
#33 0x000000000042a092 in _start ()

Reported using DrKonqi