Application: dolphin (15.12.1)

Qt Version: 5.6.0
Frameworks Version: Unknown
Operating System: Linux 4.4.4-301.fc23.x86_64 x86_64
Distribution: "Fedora release 23 (Twenty Three)"

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

I clicked the "Preview" toolbar button a couple of times, then tried to open the settings dialog from the menu. It's reproducible almost every time.

This is what I see in the log just before the crash:

QWidget::insertAction: Attempt to insert null action
QLayout: Cannot add a null widget to QVBoxLayout/
QLayout: Cannot add a null widget to QVBoxLayout/
"Tag 'b' is not defined in message {<__kuit_internal_top__><para>Check this box to allow <b>automatic deletion</b> o...}."
"Tag 'b' is not defined in message {<__kuit_internal_top__><para>Check this box to allow <b>automatic deletion</b> o...}."
QLayout: Attempting to add QLayout "" to PreviewsSettingsPage "", which already has a layout
KCrash: Application 'dolphin' crashing...
KCrash: Attempting to start /usr/libexec/drkonqi from kdeinit
sock_file=/run/user/1000/kdeinit5__0

-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fffe14a5940 (LWP 1955))]

Thread 3 (Thread 0x7fffdce4d700 (LWP 1957)):
#0  0x00007ffff055efdd in poll () from /lib64/libc.so.6
#1  0x00007fffebdb816c in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7fffd000cc10, timeout=<optimized out>, context=0x7fffd0000990) at gmain.c:4135
#2  g_main_context_iterate (context=context@entry=0x7fffd0000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3835
#3  0x00007fffebdb827c in g_main_context_iteration (context=0x7fffd0000990, may_block=may_block@entry=1) at gmain.c:3901
#4  0x00007ffff1399d0b in QEventDispatcherGlib::processEvents (this=0x7fffd00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007ffff13426ea in QEventLoop::exec (this=this@entry=0x7fffdce4cc50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007ffff116c004 in QThread::exec (this=this@entry=0x7ffff161b040 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:503
#7  0x00007ffff15a7445 in QDBusConnectionManager::run (this=0x7ffff161b040 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:181
#8  0x00007ffff1170e18 in QThreadPrivate::start (arg=0x7ffff161b040 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:340
#9  0x00007fffee10560a in start_thread (arg=0x7fffdce4d700) at pthread_create.c:334
#10 0x00007ffff056aa4d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fffd654e700 (LWP 1958)):
#0  0x00007ffff055abcd in read () from /lib64/libc.so.6
#1  0x00007fffebdfb390 in read (__nbytes=16, __buf=0x7fffd654da70, __fd=<optimized out>) at /usr/include/bits/unistd.h:44
#2  g_wakeup_acknowledge (wakeup=0x7fffd00025a0) at gwakeup.c:210
#3  0x00007fffebdb7c64 in g_main_context_check (context=context@entry=0x7fffcc000990, max_priority=2147483647, fds=fds@entry=0x7fffcc002e20, n_fds=n_fds@entry=1) at gmain.c:3632
#4  0x00007fffebdb8110 in g_main_context_iterate (context=context@entry=0x7fffcc000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3837
#5  0x00007fffebdb827c in g_main_context_iteration (context=0x7fffcc000990, may_block=may_block@entry=1) at gmain.c:3901
#6  0x00007ffff1399d0b in QEventDispatcherGlib::processEvents (this=0x7fffcc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#7  0x00007ffff13426ea in QEventLoop::exec (this=this@entry=0x7fffd654dc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#8  0x00007ffff116c004 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#9  0x00007ffff1170e18 in QThreadPrivate::start (arg=0x555555c93480) at thread/qthread_unix.cpp:340
#10 0x00007fffee10560a in start_thread (arg=0x7fffd654e700) at pthread_create.c:334
#11 0x00007ffff056aa4d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fffe14a5940 (LWP 1955)):
[KCrash Handler]
#5  std::__atomic_base<int>::operator++ (this=0xffdc6790ffdc67a0) at /usr/include/c++/5.3.1/bits/atomic_base.h:296
#6  QAtomicOps<int>::ref<int> (_q_value=...) at ../../src/corelib/arch/qatomic_cxx11.h:134
#7  QBasicAtomicInteger<int>::ref (this=0xffdc6790ffdc67a0) at ../../src/corelib/thread/qbasicatomic.h:127
#8  QtSharedPointer::ExternalRefCountData::getAndRef (obj=obj@entry=0x555555d19480) at tools/qsharedpointer.cpp:1343
#9  0x00007ffff21a61ef in QWeakPointer<QObject>::QWeakPointer<QObject> (ptr=0x555555d19480, this=<optimized out>) at ../../src/corelib/tools/qsharedpointer_impl.h:705
#10 QWeakPointer<QObject>::assign<QObject> (ptr=0x555555d19480, this=0x7ffff266c360 <qt_last_mouse_receiver>) at ../../src/corelib/tools/qsharedpointer_impl.h:701
#11 QPointer<QWidget>::operator= (p=0x555555d19480, this=0x7ffff266c360 <qt_last_mouse_receiver>) at ../../src/corelib/kernel/qpointer.h:77
#12 QWidgetWindow::handleMouseEvent (this=this@entry=0x555555f3af70, event=event@entry=0x7fffffffc7c0) at kernel/qwidgetwindow.cpp:453
#13 0x00007ffff21a83cb in QWidgetWindow::event (this=0x555555f3af70, event=0x7fffffffc7c0) at kernel/qwidgetwindow.cpp:210
#14 0x00007ffff2147c0c in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x555555f3af70, e=0x7fffffffc7c0) at kernel/qapplication.cpp:3714
#15 0x00007ffff214ce96 in QApplication::notify (this=0x7fffffffdbc0, receiver=0x555555f3af70, e=0x7fffffffc7c0) at kernel/qapplication.cpp:3495
#16 0x00007ffff1344968 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x555555f3af70, event=event@entry=0x7fffffffc7c0) at kernel/qcoreapplication.cpp:1015
#17 0x00007ffff1b63950 in QCoreApplication::sendSpontaneousEvent (event=0x7fffffffc7c0, receiver=0x555555f3af70) at ../../src/corelib/kernel/qcoreapplication.h:230
#18 QGuiApplicationPrivate::processMouseEvent (e=0x555555e36b20) at kernel/qguiapplication.cpp:1868
#19 0x00007ffff1b654e5 in QGuiApplicationPrivate::processWindowSystemEvent (e=<optimized out>) at kernel/qguiapplication.cpp:1652
#20 0x00007ffff1b426eb in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:645
#21 0x00007fffe0631940 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#22 0x00007fffebdb7e3a in g_main_dispatch (context=0x7fffd80016f0) at gmain.c:3154
#23 g_main_context_dispatch (context=context@entry=0x7fffd80016f0) at gmain.c:3769
#24 0x00007fffebdb81d0 in g_main_context_iterate (context=context@entry=0x7fffd80016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3840
#25 0x00007fffebdb827c in g_main_context_iteration (context=0x7fffd80016f0, may_block=may_block@entry=1) at gmain.c:3901
#26 0x00007ffff1399cef in QEventDispatcherGlib::processEvents (this=0x5555557b8360, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#27 0x00007ffff13426ea in QEventLoop::exec (this=this@entry=0x7fffffffcb60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#28 0x00007ffff22c7fad in QMenu::exec (this=<optimized out>, p=..., action=action@entry=0x0) at widgets/qmenu.cpp:2401
#29 0x00007ffff230981f in QToolButtonPrivate::popupTimerDone (this=0x555555c269d0) at widgets/qtoolbutton.cpp:780
#30 0x00007ffff13710a0 in QMetaObject::activate (sender=sender@entry=0x5555559b5ee0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3730
#31 0x00007ffff1371977 in QMetaObject::activate (sender=sender@entry=0x5555559b5ee0, m=m@entry=0x7ffff265cb20 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3595
#32 0x00007ffff24d3620 in QAbstractButton::pressed (this=this@entry=0x5555559b5ee0) at .moc/moc_qabstractbutton.cpp:294
#33 0x00007ffff2241a17 in QAbstractButtonPrivate::emitPressed (this=0x555555c269d0) at widgets/qabstractbutton.cpp:547
#34 0x00007ffff2241b61 in QAbstractButton::mousePressEvent (this=this@entry=0x5555559b5ee0, e=e@entry=0x7fffffffd2d0) at widgets/qabstractbutton.cpp:1104
#35 0x00007ffff230a59f in QToolButton::mousePressEvent (this=0x5555559b5ee0, e=0x7fffffffd2d0) at widgets/qtoolbutton.cpp:600
#36 0x00007ffff218c8ef in QWidget::event (this=0x5555559b5ee0, event=event@entry=0x7fffffffd2d0) at kernel/qwidget.cpp:8739
#37 0x00007ffff2243b13 in QAbstractButton::event (this=this@entry=0x5555559b5ee0, e=e@entry=0x7fffffffd2d0) at widgets/qabstractbutton.cpp:1088
#38 0x00007ffff230a849 in QToolButton::event (this=0x5555559b5ee0, event=0x7fffffffd2d0) at widgets/qtoolbutton.cpp:970
#39 0x00007ffff2147c0c in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x5555559b5ee0, e=0x7fffffffd2d0) at kernel/qapplication.cpp:3714
#40 0x00007ffff214d611 in QApplication::notify (this=<optimized out>, receiver=0x5555559b5ee0, e=0x7fffffffd2d0) at kernel/qapplication.cpp:3272
#41 0x00007ffff1344968 in QCoreApplication::notifyInternal2 (receiver=0x5555559b5ee0, event=0x7fffffffd2d0) at kernel/qcoreapplication.cpp:1015
#42 0x00007ffff214c3e5 in QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x5555559b5ee0, event=event@entry=0x7fffffffd2d0, alienWidget=alienWidget@entry=0x5555559b5ee0, nativeWidget=0x55555585dbb0, buttonDown=buttonDown@entry=0x7ffff266c380 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at ../../src/corelib/kernel/qcoreapplication.h:227
#43 0x00007ffff21a5e79 in QWidgetWindow::handleMouseEvent (this=this@entry=0x555555a340f0, event=event@entry=0x7fffffffd6e0) at kernel/qwidgetwindow.cpp:554
#44 0x00007ffff21a83cb in QWidgetWindow::event (this=0x555555a340f0, event=0x7fffffffd6e0) at kernel/qwidgetwindow.cpp:210
#45 0x00007ffff2147c0c in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x555555a340f0, e=0x7fffffffd6e0) at kernel/qapplication.cpp:3714
#46 0x00007ffff214ce96 in QApplication::notify (this=0x7fffffffdbc0, receiver=0x555555a340f0, e=0x7fffffffd6e0) at kernel/qapplication.cpp:3495
#47 0x00007ffff1344968 in QCoreApplication::notifyInternal2 (receiver=receiver@entry=0x555555a340f0, event=event@entry=0x7fffffffd6e0) at kernel/qcoreapplication.cpp:1015
#48 0x00007ffff1b63950 in QCoreApplication::sendSpontaneousEvent (event=0x7fffffffd6e0, receiver=0x555555a340f0) at ../../src/corelib/kernel/qcoreapplication.h:230
#49 QGuiApplicationPrivate::processMouseEvent (e=0x555556071350) at kernel/qguiapplication.cpp:1868
#50 0x00007ffff1b654e5 in QGuiApplicationPrivate::processWindowSystemEvent (e=<optimized out>) at kernel/qguiapplication.cpp:1652
#51 0x00007ffff1b426eb in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:645
#52 0x00007fffe0631940 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#53 0x00007fffebdb7e3a in g_main_dispatch (context=0x7fffd80016f0) at gmain.c:3154
#54 g_main_context_dispatch (context=context@entry=0x7fffd80016f0) at gmain.c:3769
#55 0x00007fffebdb81d0 in g_main_context_iterate (context=context@entry=0x7fffd80016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3840
#56 0x00007fffebdb827c in g_main_context_iteration (context=0x7fffd80016f0, may_block=may_block@entry=1) at gmain.c:3901
#57 0x00007ffff1399cef in QEventDispatcherGlib::processEvents (this=0x5555557b8360, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#58 0x00007ffff13426ea in QEventLoop::exec (this=this@entry=0x7fffffffda80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#59 0x00007ffff134addc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1285
#60 0x00007ffff7b5cef4 in kdemain () from /lib64/libkdeinit5_dolphin.so
#61 0x00007ffff0488580 in __libc_start_main () from /lib64/libc.so.6
#62 0x0000555555554be9 in _start ()

Reported using DrKonqi