Crashes here on current master, this happened while trying to open a file to editor window:

Application: digiKam (digikam), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f6e01e40980 (LWP 684))]

Thread 9 (Thread 0x7f6dd9d2a700 (LWP 689)):
#0  0x00007f6df47b387d in poll () from /usr/lib/libc.so.6
#1  0x00007f6decbe3908 in ?? () from /usr/lib/libusb-1.0.so.0
#2  0x00007f6df99730a2 in start_thread () from /usr/lib/libpthread.so.0
#3  0x00007f6df47bc32d in clone () from /usr/lib/libc.so.6

Thread 8 (Thread 0x7f6dd36ef700 (LWP 690)):
#0  0x00007f6df997703f in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f6df55b9aa8 in wait (time=18446744073709551615, this=0x1d4b030) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1d4af68, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x0000000000696d41 in Digikam::ScanController::run (this=0x1cf1a50) at /home/tpr/storage/kde/digikam-sc/core/digikam/database/scancontroller.cpp:725
#4  0x00007f6df55b95b5 in QThreadPrivate::start (arg=0x1cf1a50) at thread/qthread_unix.cpp:338
#5  0x00007f6df99730a2 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f6df47bc32d in clone () from /usr/lib/libc.so.6

Thread 7 (Thread 0x7f6dd2eee700 (LWP 691)):
#0  0x00007f6df47b387d in poll () from /usr/lib/libc.so.6
#1  0x00007f6df115d584 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f6df115d68c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f6df56f5286 in QEventDispatcherGlib::processEvents (this=0x7f6dc40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#4  0x00007f6df56c3b5f in QEventLoop::processEvents (this=this@entry=0x7f6dd2eedc20, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f6df56c3e05 in QEventLoop::exec (this=this@entry=0x7f6dd2eedc20, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f6df55b706d in QThread::exec (this=this@entry=0x1b01060) at thread/qthread.cpp:536
#7  0x00007f6df56a3ce8 in QInotifyFileSystemWatcherEngine::run (this=0x1b01060) at io/qfilesystemwatcher_inotify.cpp:256
#8  0x00007f6df55b95b5 in QThreadPrivate::start (arg=0x1b01060) at thread/qthread_unix.cpp:338
#9  0x00007f6df99730a2 in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007f6df47bc32d in clone () from /usr/lib/libc.so.6

Thread 6 (Thread 0x7f6dd26ed700 (LWP 693)):
#0  0x00007f6df997703f in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f6df55b9aa8 in wait (time=18446744073709551615, this=0x1e8d450) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1e8dbd8, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f6dfeecd9c0 in Digikam::ParkingThread::run (this=0x1e8dbc0) at /home/tpr/storage/kde/digikam-sc/core/libs/threads/threadmanager.cpp:119
#4  0x00007f6df55b95b5 in QThreadPrivate::start (arg=0x1e8dbc0) at thread/qthread_unix.cpp:338
#5  0x00007f6df99730a2 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f6df47bc32d in clone () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7f6dacff9700 (LWP 704)):
#0  0x00007f6df99773e8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f6df55b9a84 in wait (time=30000, this=0x1e2edd0) at thread/qwaitcondition_unix.cpp:84
#2  QWaitCondition::wait (this=<optimized out>, mutex=mutex@entry=0x1bda998, time=30000) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f6df55acf05 in QThreadPoolThread::run (this=0x3c23080) at concurrent/qthreadpool.cpp:141
#4  0x00007f6df55b95b5 in QThreadPrivate::start (arg=0x3c23080) at thread/qthread_unix.cpp:338
#5  0x00007f6df99730a2 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f6df47bc32d in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7f6d9f7fe700 (LWP 706)):
#0  0x00007f6df99773e8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f6df55b9a84 in wait (time=30000, this=0x1e2edd0) at thread/qwaitcondition_unix.cpp:84
#2  QWaitCondition::wait (this=<optimized out>, mutex=mutex@entry=0x1bda998, time=30000) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f6df55acf05 in QThreadPoolThread::run (this=0x3c23940) at concurrent/qthreadpool.cpp:141
#4  0x00007f6df55b95b5 in QThreadPrivate::start (arg=0x3c23940) at thread/qthread_unix.cpp:338
#5  0x00007f6df99730a2 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f6df47bc32d in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7f6d83fff700 (LWP 712)):
#0  0x00007f6df99773e8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f6df55b9a84 in wait (time=30000, this=0x1e2edd0) at thread/qwaitcondition_unix.cpp:84
#2  QWaitCondition::wait (this=<optimized out>, mutex=mutex@entry=0x1bda998, time=30000) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f6df55acf05 in QThreadPoolThread::run (this=0x3c25380) at concurrent/qthreadpool.cpp:141
#4  0x00007f6df55b95b5 in QThreadPrivate::start (arg=0x3c25380) at thread/qthread_unix.cpp:338
#5  0x00007f6df99730a2 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007f6df47bc32d in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f6d7bfef700 (LWP 728)):
#0  0x00007f6df47b54f3 in select () from /usr/lib/libc.so.6
#1  0x00007f6df56a09d3 in QProcessManager::run (this=0x7f6df5a39520 <processManager()::processManager>) at io/qprocess_unix.cpp:247
#2  0x00007f6df55b95b5 in QThreadPrivate::start (arg=0x7f6df5a39520 <processManager()::processManager>) at thread/qthread_unix.cpp:338
#3  0x00007f6df99730a2 in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007f6df47bc32d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f6e01e40980 (LWP 684)):
[KCrash Handler]
#5  0x00007f6ddd419419 in sqlite3MemCompare (pMem1=pMem1@entry=0x7fff04c04700, pMem2=<optimized out>, pColl=0x1c57810) at sqlite3.c:60482
#6  0x00007f6ddd4195d3 in sqlite3VdbeRecordCompare (nKey1=32, pKey1=0x7f6dcc02bddc, pPKey2=pPKey2@entry=0x7fff04c04a10) at sqlite3.c:64160
#7  0x00007f6ddd42da99 in sqlite3BtreeMovetoUnpacked (pCur=0x6513b90, pIdxKey=0x7fff04c04a10, intKey=0, biasRight=<optimized out>, pRes=0x7fff04c04a00) at sqlite3.c:55075
#8  0x00007f6ddd455d42 in sqlite3VdbeExec (p=p@entry=0x6513db8) at sqlite3.c:70166
#9  0x00007f6ddd45e267 in sqlite3Step (p=0x6513db8) at sqlite3.c:64826
#10 sqlite3_step (pStmt=<optimized out>) at sqlite3.c:64892
#11 0x00007f6dd1ce6f88 in QSQLiteResultPrivate::fetchNext (this=this@entry=0x65145f0, values=..., idx=idx@entry=0, initialFetch=initialFetch@entry=true) at ../../../sql/drivers/sqlite/qsql_sqlite.cpp:235
#12 0x00007f6dd1ce7e57 in QSQLiteResult::exec (this=0x64e2c00) at ../../../sql/drivers/sqlite/qsql_sqlite.cpp:447
#13 0x00007f6e01aa3ced in QSqlQuery::exec (this=0x7fff04c04ff0) at kernel/qsqlquery.cpp:949
#14 0x00007f6dfee65947 in Digikam::DatabaseCoreBackend::exec (this=0x1a81d10, query=...) at /home/tpr/storage/kde/digikam-sc/core/libs/database/core/databasecorebackend.cpp:1415
#15 0x00007f6dfee65a79 in Digikam::DatabaseCoreBackend::execQuery (this=0x1a81d10, query=..., boundValue1=...) at /home/tpr/storage/kde/digikam-sc/core/libs/database/core/databasecorebackend.cpp:1057
#16 0x00007f6dfee651e8 in Digikam::DatabaseCoreBackend::execQuery (this=0x1a81d10, sql=..., boundValue1=...) at /home/tpr/storage/kde/digikam-sc/core/libs/database/core/databasecorebackend.cpp:1006
#17 0x00007f6dfee6512a in Digikam::DatabaseCoreBackend::execSql (this=0x1a81d10, sql=..., boundValue1=..., values=0x7fff04c050b8, lastInsertId=0x0) at /home/tpr/storage/kde/digikam-sc/core/libs/database/core/databasecorebackend.cpp:903
#18 0x00007f6dfe815324 in Digikam::AlbumDB::getSetting (this=0x1a801a0, keyword=...) at /home/tpr/storage/kde/digikam-sc/core/libs/database/albumdb.cpp:970
#19 0x00007f6dfe8154fc in Digikam::AlbumDB::getFilterSettings (this=0x1a801a0, imageFilter=0x7fff04c05310, videoFilter=0x0, audioFilter=0x0) at /home/tpr/storage/kde/digikam-sc/core/libs/database/albumdb.cpp:1017
#20 0x000000000074c906 in Digikam::AlbumSettings::getImageFileFilter (this=0x1bfef50) at /home/tpr/storage/kde/digikam-sc/core/digikam/utils/albumsettings.cpp:919
#21 0x00000000006f2ad7 in Digikam::ImageViewUtilities::openInEditor (this=0x20dc960, info=..., allInfosToOpen=..., currentAlbum=0x4676e80) at /home/tpr/storage/kde/digikam-sc/core/digikam/items/imageviewutilities.cpp:267
#22 0x00000000007752ce in Digikam::DigikamView::slotEditor (this=0x1f85940) at /home/tpr/storage/kde/digikam-sc/core/digikam/views/digikamview.cpp:1666
#23 0x00000000007747a5 in Digikam::DigikamView::slotImageEdit (this=0x1f85940) at /home/tpr/storage/kde/digikam-sc/core/digikam/views/digikamview.cpp:1700
#24 0x000000000077123d in Digikam::DigikamView::qt_static_metacall (_o=0x1f85940, _c=QMetaObject::InvokeMetaMethod, _id=60, _a=0x7fff04c05750) at /home/tpr/storage/kde/digikam-sc/core/build/digikam/digikamview.moc:308
#25 0x00007f6df56dae48 in QMetaObject::activate (sender=sender@entry=0x2f59030, m=m@entry=0x7f6df6eab1a0 <QAction::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fff04c05750) at kernel/qobject.cpp:3547
#26 0x00007f6df633ecc2 in QAction::triggered (this=this@entry=0x2f59030, _t1=false) at .moc/debug-shared/moc_qaction.cpp:276
#27 0x00007f6df6340813 in QAction::activate (this=this@entry=0x2f59030, event=event@entry=QAction::Trigger) at kernel/qaction.cpp:1257
#28 0x00007f6df67c26c9 in QMenuPrivate::activateCausedStack (this=this@entry=0x5eb0ad0, causedStack=..., action=action@entry=0x2f59030, action_e=action_e@entry=QAction::Trigger, self=self@entry=true) at widgets/qmenu.cpp:1038
#29 0x00007f6df67c7149 in QMenuPrivate::activateAction (this=0x5eb0ad0, action=0x2f59030, action_e=QAction::Trigger, self=<optimized out>) at widgets/qmenu.cpp:1130
#30 0x00007f6df71df355 in KMenu::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/libkdeui.so.5
#31 0x00007f6df639dab8 in QWidget::event (this=this@entry=0x7fff04c068a0, event=event@entry=0x7fff04c05e80) at kernel/qwidget.cpp:8376
#32 0x00007f6df67cb75b in QMenu::event (this=0x7fff04c068a0, e=0x7fff04c05e80) at widgets/qmenu.cpp:2481
#33 0x00007f6df63454a1 in QApplicationPrivate::notify_helper (this=this@entry=0x19c06c0, receiver=receiver@entry=0x7fff04c068a0, e=e@entry=0x7fff04c05e80) at kernel/qapplication.cpp:4562
#34 0x00007f6df634dd10 in QApplication::notify (this=<optimized out>, receiver=0x7fff04c068a0, e=0x7fff04c05e80) at kernel/qapplication.cpp:4105
#35 0x00007f6df712877a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#36 0x00007f6df56c572d in QCoreApplication::notifyInternal (this=0x7fff04c080a8, receiver=receiver@entry=0x7fff04c068a0, event=event@entry=0x7fff04c05e80) at kernel/qcoreapplication.cpp:949
#37 0x00007f6df634bb82 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#38 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x7fff04c068a0, event=event@entry=0x7fff04c05e80, alienWidget=alienWidget@entry=0x0, nativeWidget=nativeWidget@entry=0x7fff04c068a0, buttonDown=buttonDown@entry=0x7f6df6ee6358 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3173
#39 0x00007f6df63c8bfc in QETWidget::translateMouseEvent (this=this@entry=0x7fff04c068a0, event=event@entry=0x7fff04c061c0) at kernel/qapplication_x11.cpp:4451
#40 0x00007f6df63c72a1 in QApplication::x11ProcessEvent (this=0x7fff04c080a8, event=event@entry=0x7fff04c061c0) at kernel/qapplication_x11.cpp:3640
#41 0x00007f6df63ef2f2 in x11EventSourceDispatch (s=0x19bf050, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#42 0x00007f6df115d296 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#43 0x00007f6df115d5e8 in ?? () from /usr/lib/libglib-2.0.so.0
#44 0x00007f6df115d68c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#45 0x00007f6df56f5265 in QEventDispatcherGlib::processEvents (this=0x18b92f0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#46 0x00007f6df63ef3e6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#47 0x00007f6df56c3b5f in QEventLoop::processEvents (this=this@entry=0x7fff04c065c0, flags=...) at kernel/qeventloop.cpp:149
#48 0x00007f6df56c3e05 in QEventLoop::exec (this=this@entry=0x7fff04c065c0, flags=...) at kernel/qeventloop.cpp:204
#49 0x00007f6df67ca507 in QMenu::exec (this=0x7fff04c068a0, p=..., action=0x0) at widgets/qmenu.cpp:2125
#50 0x000000000075ac14 in Digikam::ContextMenuHelper::exec (this=0x7fff04c06888, pos=..., at=0x0) at /home/tpr/storage/kde/digikam-sc/core/digikam/utils/contextmenuhelper.cpp:1132
#51 0x0000000000780462 in Digikam::ImagePreviewView::slotShowContextMenu (this=0x20b32f0, event=0x7fff04c06ec0) at /home/tpr/storage/kde/digikam-sc/core/digikam/views/imagepreviewview.cpp:418
#52 0x000000000077ec3c in Digikam::ImagePreviewView::qt_static_metacall (_o=0x20b32f0, _c=QMetaObject::InvokeMetaMethod, _id=28, _a=0x7fff04c06a70) at /home/tpr/storage/kde/digikam-sc/core/build/digikam/imagepreviewview.moc:126
#53 0x00007f6df56dae48 in QMetaObject::activate (sender=0x207d0c0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff04c06a70) at kernel/qobject.cpp:3547
#54 0x00007f6dfefc074f in Digikam::GraphicsDImgItem::showContextMenu (this=0x207d0c0, _t1=0x7fff04c06ec0) at /home/tpr/storage/kde/digikam-sc/core/build/digikam/graphicsdimgitem.moc:103
#55 0x00007f6dfefc1a6d in Digikam::GraphicsDImgItem::contextMenuEvent (this=0x207d0c0, e=0x7fff04c06ec0) at /home/tpr/storage/kde/digikam-sc/core/libs/widgets/graphicsview/graphicsdimgitem.cpp:236
#56 0x00007f6dfefc1aaf in non-virtual thunk to Digikam::GraphicsDImgItem::contextMenuEvent(QGraphicsSceneContextMenuEvent*) () at /home/tpr/storage/kde/digikam-sc/core/libs/widgets/graphicsview/graphicsdimgitem.cpp:237
#57 0x00007f6df6968f97 in QGraphicsItem::sceneEvent (this=0x207d0d0, event=0x7fff04c06ec0) at graphicsview/qgraphicsitem.cpp:6720
#58 0x00007f6df69948af in QGraphicsScene::contextMenuEvent (this=<optimized out>, contextMenuEvent=0x7fff04c06ec0) at graphicsview/qgraphicsscene.cpp:3617
#59 0x00007f6df69ab8e5 in QGraphicsScene::event (this=0x20cfdc0, event=0x7fff04c06ec0) at graphicsview/qgraphicsscene.cpp:3412
#60 0x00007f6df63454a1 in QApplicationPrivate::notify_helper (this=this@entry=0x19c06c0, receiver=receiver@entry=0x20cfdc0, e=e@entry=0x7fff04c06ec0) at kernel/qapplication.cpp:4562
#61 0x00007f6df634c33d in QApplication::notify (this=0x7fff04c080a8, receiver=0x20cfdc0, e=0x7fff04c06ec0) at kernel/qapplication.cpp:4348
#62 0x00007f6df712877a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#63 0x00007f6df56c572d in QCoreApplication::notifyInternal (this=0x7fff04c080a8, receiver=0x20cfdc0, event=event@entry=0x7fff04c06ec0) at kernel/qcoreapplication.cpp:949
#64 0x00007f6df69c6117 in sendEvent (event=0x7fff04c06ec0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#65 QGraphicsView::contextMenuEvent (this=0x20b32f0, event=0x7fff04c073a0) at graphicsview/qgraphicsview.cpp:2892
#66 0x00007f6df639de3a in QWidget::event (this=this@entry=0x20b32f0, event=event@entry=0x7fff04c073a0) at kernel/qwidget.cpp:8554
#67 0x00007f6df678592e in QFrame::event (this=0x20b32f0, e=0x7fff04c073a0) at widgets/qframe.cpp:557
#68 0x00007f6df69c5bb8 in QGraphicsView::viewportEvent (this=0x20b32f0, event=0x7fff04c073a0) at graphicsview/qgraphicsview.cpp:2866
#69 0x00007f6df56c5907 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x19c06c0, receiver=receiver@entry=0x20d1c90, event=event@entry=0x7fff04c073a0) at kernel/qcoreapplication.cpp:1059
#70 0x00007f6df6345491 in QApplicationPrivate::notify_helper (this=this@entry=0x19c06c0, receiver=receiver@entry=0x20d1c90, e=e@entry=0x7fff04c073a0) at kernel/qapplication.cpp:4558
#71 0x00007f6df634da3f in QApplication::notify (this=<optimized out>, receiver=0x20d1c90, e=0x7fff04c073a0) at kernel/qapplication.cpp:4184
#72 0x00007f6df712877a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#73 0x00007f6df56c572d in QCoreApplication::notifyInternal (this=0x7fff04c080a8, receiver=receiver@entry=0x20d1c90, event=event@entry=0x7fff04c073a0) at kernel/qcoreapplication.cpp:949
#74 0x00007f6df63c88f0 in sendSpontaneousEvent (event=0x7fff04c073a0, receiver=0x20d1c90) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#75 QETWidget::translateMouseEvent (this=this@entry=0x20b32f0, event=event@entry=0x7fff04c076e0) at kernel/qapplication_x11.cpp:4522
#76 0x00007f6df63c72a1 in QApplication::x11ProcessEvent (this=0x7fff04c080a8, event=event@entry=0x7fff04c076e0) at kernel/qapplication_x11.cpp:3640
#77 0x00007f6df63ef2f2 in x11EventSourceDispatch (s=0x19bf050, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#78 0x00007f6df115d296 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#79 0x00007f6df115d5e8 in ?? () from /usr/lib/libglib-2.0.so.0
#80 0x00007f6df115d68c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#81 0x00007f6df56f5265 in QEventDispatcherGlib::processEvents (this=0x18b92f0, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#82 0x00007f6df63ef3e6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#83 0x00007f6df56c3b5f in QEventLoop::processEvents (this=this@entry=0x7fff04c07ad0, flags=...) at kernel/qeventloop.cpp:149
#84 0x00007f6df56c3e05 in QEventLoop::exec (this=this@entry=0x7fff04c07ad0, flags=...) at kernel/qeventloop.cpp:204
#85 0x00007f6df56c9c89 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1221
#86 0x000000000082248b in main (argc=1, argv=0x7fff04c082c8) at /home/tpr/storage/kde/digikam-sc/core/digikam/main/main.cpp:236