Application: dolphin (15.08.1)

Qt Version: 5.4.2
Operating System: Linux 4.2.0-040200rc3-generic x86_64
Distribution: Ubuntu Wily Werewolf (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
Akregator update ate my feeds (but that's another bug)... so I'm poking around in "~/.kde/share/apps" so I can copy akregator folder to somewhere else to work on it.
I notice there is two folders "akregator" and "akregator.old" so I select them (drag select) -> boom.
Try again -> boom.
Try clicking "akregator" first (no boom) then "akregator.old" -> boom
Try other way - first click "akregator.old" (no boom) then click "akregator" -> boom

Try random other folders (anywhere) -> first click, no boom, second folder selected -> boom 

Noticed Baloo in trace; it's indexing is not enabled (slows my Xeon desktop to a crawl like nothing else, but that's another bug)
Noticed also " Bug 347684 - baloo_file crash - FileIQ::fileQueue - mdb_txn_begin "

The crash can be reproduced every time.

-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fb4c1518800 (LWP 10761))]

Thread 5 (Thread 0x7fb4abf38700 (LWP 10762)):
#0  0x00007fb4c0f398dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fb4b593cbd2 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fb4b593e74f in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fb4ae4869e9 in QXcbEventReader::run() (this=0x1809dd0) at qxcbconnection.cpp:1105
#4  0x00007fb4bbdce25e in QThreadPrivate::start(void*) (arg=0x1809dd0) at thread/qthread_unix.cpp:337
#5  0x00007fb4b84396aa in start_thread (arg=0x7fb4abf38700) at pthread_create.c:333
#6  0x00007fb4c0f44eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fb4a1dfa700 (LWP 10764)):
#0  0x00007fb4b843eda0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fb4a9bd2513 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#2  0x00007fb4a9bd1b28 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#3  0x00007fb4b84396aa in start_thread (arg=0x7fb4a1dfa700) at pthread_create.c:333
#4  0x00007fb4c0f44eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fb49e5e2700 (LWP 10765)):
#0  0x00007fb4b7d478b4 in g_mutex_unlock (mutex=0x7fb498000990) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gthread-posix.c:1350
#1  0x00007fb4b7d031e1 in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7fb498003020, timeout=<optimized out>, context=0x7fb498000990) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:4134
#2  0x00007fb4b7d031e1 in g_main_context_iterate (context=context@entry=0x7fb498000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3835
#3  0x00007fb4b7d032fc in g_main_context_iteration (context=0x7fb498000990, may_block=may_block@entry=1) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3901
#4  0x00007fb4bc004e1b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fb4980008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007fb4bbfab2da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fb49e5e1dc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fb4bbdc9374 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fb4bbdce25e in QThreadPrivate::start(void*) (arg=0x1d42c90) at thread/qthread_unix.cpp:337
#8  0x00007fb4b84396aa in start_thread (arg=0x7fb49e5e2700) at pthread_create.c:333
#9  0x00007fb4c0f44eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fb4976d3700 (LWP 14483)):
#0  0x00007fb4b843f149 in pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007fb4bbdcf436 in QWaitCondition::wait(QMutex*, unsigned long) (time=30000, this=0x222cdb0) at thread/qwaitcondition_unix.cpp:126
#2  0x00007fb4bbdcf436 in QWaitCondition::wait(QMutex*, unsigned long) (time=30000, this=0x222cdb0) at thread/qwaitcondition_unix.cpp:134
#3  0x00007fb4bbdcf436 in QWaitCondition::wait(QMutex*, unsigned long) (this=this@entry=0x1f0eba0, mutex=mutex@entry=0x2435c60, time=30000) at thread/qwaitcondition_unix.cpp:208
#4  0x00007fb4bbdcafa3 in QThreadPoolThread::run() (this=0x1f0eb90) at thread/qthreadpool.cpp:127
#5  0x00007fb4bbdce25e in QThreadPrivate::start(void*) (arg=0x1f0eb90) at thread/qthread_unix.cpp:337
#6  0x00007fb4b84396aa in start_thread (arg=0x7fb4976d3700) at pthread_create.c:333
#7  0x00007fb4c0f44eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fb4c1518800 (LWP 10761)):
[KCrash Handler]
#6  0x00007fb4b4613b40 in mdb_txn_begin () at /usr/lib/x86_64-linux-gnu/liblmdb.so.0
#7  0x00007fb4bed3b5fc in Baloo::File::load() (this=0x7ffd6e1e33e0) at ../../../src/lib/file.cpp:108
#8  0x00007fb4bf2cb806 in  () at /usr/lib/x86_64-linux-gnu/libKF5BalooWidgets.so.5
#9  0x00007fb4bbfdf1d1 in QObject::event(QEvent*) (this=0x25bfdf0, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007fb4bca8bb8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x17e8920, receiver=receiver@entry=0x25bfdf0, e=e@entry=0x2089380) at kernel/qapplication.cpp:3720
#11 0x00007fb4bca91230 in QApplication::notify(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=0x25bfdf0, e=0x2089380) at kernel/qapplication.cpp:3503
#12 0x00007fb4bbfada9b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=0x25bfdf0, event=event@entry=0x2089380) at kernel/qcoreapplication.cpp:935
#13 0x00007fb4bbfafbd7 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (event=0x2089380, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#14 0x00007fb4bbfafbd7 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x17e7ad0) at kernel/qcoreapplication.cpp:1552
#15 0x00007fb4bbfb0108 in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#16 0x00007fb4bc0049f3 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=0x1832090) at kernel/qeventdispatcher_glib.cpp:271
#17 0x00007fb4b7d02ff7 in g_main_context_dispatch (context=0x7fb4a40016f0) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3154
#18 0x00007fb4b7d02ff7 in g_main_context_dispatch (context=context@entry=0x7fb4a40016f0) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3769
#19 0x00007fb4b7d03250 in g_main_context_iterate (context=context@entry=0x7fb4a40016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3840
#20 0x00007fb4b7d032fc in g_main_context_iteration (context=0x7fb4a40016f0, may_block=may_block@entry=1) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3901
#21 0x00007fb4bc004dff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x1839ef0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007fb4bbfab2da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffd6e1e39b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007fb4bcc09e90 in QMenu::exec(QPoint const&, QAction*) (this=<optimized out>, p=..., action=0x0) at widgets/qmenu.cpp:2180
#24 0x00007fb4c125d356 in  () at /usr/lib/x86_64-linux-gnu/libkdeinit5_dolphin.so
#25 0x00007fb4c125e8d5 in  () at /usr/lib/x86_64-linux-gnu/libkdeinit5_dolphin.so
#26 0x00007fb4c1254014 in  () at /usr/lib/x86_64-linux-gnu/libkdeinit5_dolphin.so
#27 0x00007fb4bbfde197 in QMetaObject::activate(QObject*, int, int, void**) (a=0x7ffd6e1e3d90, r=0x18bd7e0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#28 0x00007fb4bbfde197 in QMetaObject::activate(QObject*, int, int, void**) (sender=0x1d3b290, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3702
#29 0x00007fb4c0bff504 in DolphinView::requestContextMenu(QPoint const&, KFileItem const&, QUrl const&, QList<QAction*> const&) () at /usr/lib/x86_64-linux-gnu/libdolphinprivate.so.5
#30 0x00007fb4c0bdaf8e in DolphinView::slotItemContextMenuRequested(int, QPointF const&) () at /usr/lib/x86_64-linux-gnu/libdolphinprivate.so.5
#31 0x00007fb4bbfde197 in QMetaObject::activate(QObject*, int, int, void**) (a=0x7ffd6e1e3f50, r=0x1d3b290, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#32 0x00007fb4bbfde197 in QMetaObject::activate(QObject*, int, int, void**) (sender=0x1d498b0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3702
#33 0x00007fb4c0bfd8d6 in KItemListController::itemContextMenuRequested(int, QPointF const&) () at /usr/lib/x86_64-linux-gnu/libdolphinprivate.so.5
#34 0x00007fb4c0b9cb3d in KItemListController::mousePressEvent(QGraphicsSceneMouseEvent*, QTransform const&) () at /usr/lib/x86_64-linux-gnu/libdolphinprivate.so.5
#35 0x00007fb4c0b9c0f4 in KItemListController::processEvent(QEvent*, QTransform const&) () at /usr/lib/x86_64-linux-gnu/libdolphinprivate.so.5
#36 0x00007fb4c0bae572 in KItemListView::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libdolphinprivate.so.5
#37 0x00007fb4bca8bb8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x17e8920, receiver=receiver@entry=0x1d399b0, e=e@entry=0x7ffd6e1e47f0) at kernel/qapplication.cpp:3720
#38 0x00007fb4bca91230 in QApplication::notify(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=0x1d399b0, e=0x7ffd6e1e47f0) at kernel/qapplication.cpp:3503
#39 0x00007fb4bbfada9b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=0x1d399b0, event=event@entry=0x7ffd6e1e47f0) at kernel/qcoreapplication.cpp:935
#40 0x00007fb4bca88286 in qt_sendSpontaneousEvent(QObject*, QEvent*) (event=event@entry=0x7ffd6e1e47f0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#41 0x00007fb4bca88286 in qt_sendSpontaneousEvent(QObject*, QEvent*) (receiver=<optimized out>, event=event@entry=0x7ffd6e1e47f0) at kernel/qapplication.cpp:4166
#42 0x00007fb4bcda72c3 in QGraphicsScenePrivate::sendEvent(QGraphicsItem*, QEvent*) (this=<optimized out>, item=0x1d399c0, event=0x7ffd6e1e47f0) at graphicsview/qgraphicsscene.cpp:1236
#43 0x00007fb4bcda7d71 in QGraphicsScenePrivate::sendMouseEvent(QGraphicsSceneMouseEvent*) (this=0x1db1d80, mouseEvent=0x7ffd6e1e47f0) at graphicsview/qgraphicsscene.cpp:1314
#44 0x00007fb4bcdafd76 in QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent*) (this=this@entry=0x1db1d80, mouseEvent=mouseEvent@entry=0x7ffd6e1e47f0) at graphicsview/qgraphicsscene.cpp:1441
#45 0x00007fb4bcdb01a9 in QGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent*) (this=<optimized out>, mouseEvent=0x7ffd6e1e47f0) at graphicsview/qgraphicsscene.cpp:3990
#46 0x00007fb4bcdb95b0 in QGraphicsScene::event(QEvent*) (this=0x1db8270, event=0x7ffd6e1e47f0) at graphicsview/qgraphicsscene.cpp:3358
#47 0x00007fb4bca8bb8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x17e8920, receiver=receiver@entry=0x1db8270, e=e@entry=0x7ffd6e1e47f0) at kernel/qapplication.cpp:3720
#48 0x00007fb4bca91230 in QApplication::notify(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=0x1db8270, e=0x7ffd6e1e47f0) at kernel/qapplication.cpp:3503
#49 0x00007fb4bbfada9b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=0x1db8270, event=event@entry=0x7ffd6e1e47f0) at kernel/qcoreapplication.cpp:935
#50 0x00007fb4bca88286 in qt_sendSpontaneousEvent(QObject*, QEvent*) (event=event@entry=0x7ffd6e1e47f0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#51 0x00007fb4bca88286 in qt_sendSpontaneousEvent(QObject*, QEvent*) (receiver=<optimized out>, event=event@entry=0x7ffd6e1e47f0) at kernel/qapplication.cpp:4166
#52 0x00007fb4bcdd3a0f in QGraphicsView::mousePressEvent(QMouseEvent*) (this=0x1db8290, event=0x7ffd6e1e4d80) at graphicsview/qgraphicsview.cpp:3268
#53 0x00007fb4bcace5cf in QWidget::event(QEvent*) (this=this@entry=0x1db8290, event=event@entry=0x7ffd6e1e4d80) at kernel/qwidget.cpp:8653
#54 0x00007fb4bcbc876e in QFrame::event(QEvent*) (this=0x1db8290, e=0x7ffd6e1e4d80) at widgets/qframe.cpp:526
#55 0x00007fb4bcdd4dd3 in QGraphicsView::viewportEvent(QEvent*) (this=0x1db8290, event=0x7ffd6e1e4d80) at graphicsview/qgraphicsview.cpp:2960
#56 0x00007fb4bbfad88c in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) (this=this@entry=0x17e8920, receiver=receiver@entry=0x1d90dc0, event=event@entry=0x7ffd6e1e4d80) at kernel/qcoreapplication.cpp:1031
#57 0x00007fb4bca8bb6c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x17e8920, receiver=receiver@entry=0x1d90dc0, e=e@entry=0x7ffd6e1e4d80) at kernel/qapplication.cpp:3716
#58 0x00007fb4bca91c7a in QApplication::notify(QObject*, QEvent*) (this=<optimized out>, receiver=0x1d90dc0, e=0x7ffd6e1e4d80) at kernel/qapplication.cpp:3280
#59 0x00007fb4bbfada9b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=receiver@entry=0x1d90dc0, event=event@entry=0x7ffd6e1e4d80) at kernel/qcoreapplication.cpp:935
#60 0x00007fb4bca906f2 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) (event=0x7ffd6e1e4d80, receiver=0x1d90dc0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#61 0x00007fb4bca906f2 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) (receiver=receiver@entry=0x1d90dc0, event=event@entry=0x7ffd6e1e4d80, alienWidget=alienWidget@entry=0x1d90dc0, nativeWidget=0x18bd7e0, buttonDown=buttonDown@entry=0x7fb4bcfb1a10 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2751
#62 0x00007fb4bcae5440 in QWidgetWindow::handleMouseEvent(QMouseEvent*) (this=this@entry=0x1b62ea0, event=event@entry=0x7ffd6e1e51a0) at kernel/qwidgetwindow.cpp:543
#63 0x00007fb4bcae778b in QWidgetWindow::event(QEvent*) (this=0x1b62ea0, event=0x7ffd6e1e51a0) at kernel/qwidgetwindow.cpp:210
#64 0x00007fb4bca8bb8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x17e8920, receiver=receiver@entry=0x1b62ea0, e=e@entry=0x7ffd6e1e51a0) at kernel/qapplication.cpp:3720
#65 0x00007fb4bca91230 in QApplication::notify(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=0x1b62ea0, e=0x7ffd6e1e51a0) at kernel/qapplication.cpp:3503
#66 0x00007fb4bbfada9b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd6e1e5650, receiver=receiver@entry=0x1b62ea0, event=event@entry=0x7ffd6e1e51a0) at kernel/qcoreapplication.cpp:935
#67 0x00007fb4bc4e0458 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) (event=0x7ffd6e1e51a0, receiver=0x1b62ea0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#68 0x00007fb4bc4e0458 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) (e=0x210fe30) at kernel/qguiapplication.cpp:1772
#69 0x00007fb4bc4e2095 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) (e=e@entry=0x210fe30) at kernel/qguiapplication.cpp:1576
#70 0x00007fb4bc4c7648 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=...) at kernel/qwindowsysteminterface.cpp:572
#71 0x00007fb4ae4b31e0 in userEventSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#72 0x00007fb4b7d02ff7 in g_main_context_dispatch (context=0x7fb4a40016f0) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3154
#73 0x00007fb4b7d02ff7 in g_main_context_dispatch (context=context@entry=0x7fb4a40016f0) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3769
#74 0x00007fb4b7d03250 in g_main_context_iterate (context=context@entry=0x7fb4a40016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3840
#75 0x00007fb4b7d032fc in g_main_context_iteration (context=0x7fb4a40016f0, may_block=may_block@entry=1) at /build/glib2.0-QXxxHj/glib2.0-2.45.8/./glib/gmain.c:3901
#76 0x00007fb4bc004dff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x1839ef0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#77 0x00007fb4bbfab2da in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffd6e1e5520, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#78 0x00007fb4bbfb2e4c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1188
#79 0x00007fb4c12661c4 in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_dolphin.so
#80 0x00007fb4c0e5ea40 in __libc_start_main (main=0x400730 <main>, argc=1, argv=0x7ffd6e1e57d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd6e1e57c8) at libc-start.c:289
#81 0x0000000000400769 in _start ()

Reported using DrKonqi