Application: dolphin (15.12.3)
 (Compiled from sources)
Qt Version: 5.6.1
Frameworks Version: 5.24.0
Operating System: Linux 4.4.12-gentoo x86_64
Distribution: "NAME=Gentoo"

-- Information about the crash:
- What I was doing when the application crashed:

I opened a folder with images. I did it again but this time Dolphin did not crash anymore. Hope the backtrace is useful.

The crash does not seem to be reproducible.

-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f0065e8f840 (LWP 18407))]

Thread 4 (Thread 0x7f004b4cc700 (LWP 18409)):
#0  0x00007f00658dc3ed in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f005aa8af2c in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f0044003020, timeout=-1, context=0x7f0044000990) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:4135
#2  g_main_context_iterate (context=context@entry=0x7f0044000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:3835
#3  0x00007f005aa8b03c in g_main_context_iteration (context=0x7f0044000990, may_block=1) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:3901
#4  0x00007f006068b40c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f006063d12a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0060494674 in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#7  0x00007f0065f7c235 in QDBusConnectionManager::run() () from /usr/lib64/libQt5DBus.so.5
#8  0x00007f0060498e2c in QThreadPrivate::start(void*) () from /usr/lib64/libQt5Core.so.5
#9  0x00007f005c7a7434 in start_thread (arg=0x7f004b4cc700) at pthread_create.c:334
#10 0x00007f00658e550d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f003e2ec700 (LWP 18410)):
#0  pthread_cond_wait () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0049c7b943 in ?? () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f0049c7b067 in ?? () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f005c7a7434 in start_thread (arg=0x7f003e2ec700) at pthread_create.c:334
#4  0x00007f00658e550d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f003b9ad700 (LWP 18411)):
#0  0x00007f00658dc3ed in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f005aa8af2c in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f0034002e20, timeout=-1, context=0x7f0034000990) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:4135
#2  g_main_context_iterate (context=context@entry=0x7f0034000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:3835
#3  0x00007f005aa8b03c in g_main_context_iteration (context=0x7f0034000990, may_block=1) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:3901
#4  0x00007f006068b40c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f006063d12a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0060494674 in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#7  0x00007f0060498e2c in QThreadPrivate::start(void*) () from /usr/lib64/libQt5Core.so.5
#8  0x00007f005c7a7434 in start_thread (arg=0x7f003b9ad700) at pthread_create.c:334
#9  0x00007f00658e550d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f0065e8f840 (LWP 18407)):
[KCrash Handler]
#6  0x0000000000f86910 in ?? ()
#7  0x00007f006554dfd9 in KFileItemModelRolesUpdater::rolesData(KFileItem const&) () from /usr/lib64/libdolphinprivate.so.5
#8  0x00007f0065550dbc in KFileItemModelRolesUpdater::slotGotPreview(KFileItem const&, QPixmap const&) () from /usr/lib64/libdolphinprivate.so.5
#9  0x00007f0060666102 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#10 0x00007f00637c5e57 in KIO::PreviewJob::gotPreview(KFileItem const&, QPixmap const&) () from /usr/lib64/libKF5KIOWidgets.so.5
#11 0x00007f00637c94a9 in KIO::PreviewJobPrivate::emitPreview(QImage const&) () from /usr/lib64/libKF5KIOWidgets.so.5
#12 0x00007f00637ca240 in KIO::PreviewJobPrivate::slotThumbData(KIO::Job*, QByteArray const&) () from /usr/lib64/libKF5KIOWidgets.so.5
#13 0x00007f00637cac1c in KIO::PreviewJob::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib64/libKF5KIOWidgets.so.5
#14 0x00007f0060665a9c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#15 0x00007f0063457c34 in KIO::TransferJob::data(KIO::Job*, QByteArray const&) () from /usr/lib64/libKF5KIOCore.so.5
#16 0x00007f0063457f1e in KIO::TransferJob::slotData(QByteArray const&) () from /usr/lib64/libKF5KIOCore.so.5
#17 0x00007f00634594ad in KIO::TransferJob::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib64/libKF5KIOCore.so.5
#18 0x00007f0060665a9c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#19 0x00007f0063431eb2 in KIO::SlaveInterface::data(QByteArray const&) () from /usr/lib64/libKF5KIOCore.so.5
#20 0x00007f0063434fb0 in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib64/libKF5KIOCore.so.5
#21 0x00007f0063432537 in KIO::SlaveInterface::dispatch() () from /usr/lib64/libKF5KIOCore.so.5
#22 0x00007f00634369e6 in KIO::Slave::gotInput() () from /usr/lib64/libKF5KIOCore.so.5
#23 0x00007f00634b4685 in KIO::Slave::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib64/libKF5KIOCore.so.5
#24 0x00007f0060665a9c in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#25 0x00007f00633e1e67 in KIO::ConnectionPrivate::dequeue() [clone .part.6] () from /usr/lib64/libKF5KIOCore.so.5
#26 0x00007f006066702a in QObject::event(QEvent*) () from /usr/lib64/libQt5Core.so.5
#27 0x00007f0060ed657c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#28 0x00007f0060edac90 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#29 0x00007f006063e5a0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#30 0x00007f0060640803 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQt5Core.so.5
#31 0x00007f006068b383 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib64/libQt5Core.so.5
#32 0x00007f005aa8acad in g_main_dispatch (context=0x7f004c0016f0) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:3154
#33 g_main_context_dispatch (context=context@entry=0x7f004c0016f0) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:3769
#34 0x00007f005aa8af90 in g_main_context_iterate (context=context@entry=0x7f004c0016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:3840
#35 0x00007f005aa8b03c in g_main_context_iteration (context=0x7f004c0016f0, may_block=1) at /hdd/tmp/portage/dev-libs/glib-2.46.2-r3/work/glib-2.46.2/glib/gmain.c:3901
#36 0x00007f006068b3f7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#37 0x00007f006063d12a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#38 0x00007f0060644d1c in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5
#39 0x00007f0065bf5c69 in kdemain () from /usr/lib64/libkdeinit5_dolphin.so
#40 0x00007f006581c630 in __libc_start_main (main=0x400790 <main>, argc=1, argv=0x7fffd3a28908, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffd3a288f8) at libc-start.c:289
#41 0x00000000004007c9 in _start ()

Reported using DrKonqi