*** Bug 420516 has been marked as a duplicate of this bug. ***

> Qt Version: 5.9.8
>_Frameworks Version: 5.60.0

Is this reproducible with more recent versions ?

Can't really say for the time being, I'm more or less locked in to Qt 5.9 but as soon as I figure out how to trigger this I'll try with the KDevelop AppImage.

Application: kdevelop (5.5.0-28-g20dd819cea)
 (Compiled from sources)
Qt Version: 5.9.8
Frameworks Version: 5.60.0
Operating System: Linux 4.14.23-ck1-mainline-core2-rjvb x86_64
Windowing system: X11
Distribution: Ubuntu 14.04.6 LTS

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

Another crash like this, quite a bit after I exited from a KDevelop session. From the looks of it, a timer fires that is connected to a KDirLister job, which is apparently still alive (after the core cleanup routine exited?!) but which has a stale reference to an associated KJobWidget. I'll try to look into this, but if my analysis rings any bells please tell me where I could start looking.

Could this be a side-effect of the somewhat recent change where on-disk changes are handled through a timer instead of queued immediately?

-- Backtrace:
Application: KDevelop (kdevelop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f9fc88a3c80 (LWP 28813))]

Thread 7 (Thread 0x7f9f87927700 (LWP 28969)):
#0  0x00007f9fbf4a137d in read () at /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f9fb5aeea7f in g_wakeup_acknowledge (wakeup=0x7f9f88002780) at gwakeup.c:210
#2  0x00007f9fb5aeea7f in g_main_context_check (context=0x7f9f80000990, max_priority=2147483647, fds=0x7f9f800013c0, n_fds=1) at gmain.c:3686
#3  0x00007f9fb5aef7a6 in g_main_context_iterate (context=<optimized out>, block=<optimized out>, dispatch=<optimized out>, self=<optimized out>) at gmain.c:3905
#4  0x00007f9fb5aefa21 in g_main_context_iteration (context=0x7f9f80000990, may_block=1) at gmain.c:3969
#5  0x00007f9fc02965db in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f800008c0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:425
#6  0x00007f9fc0242472 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f87926978, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:134
#7  0x00007f9fc0242472 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f87926978, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:212
#8  0x00007f9fc0097867 in QThread::exec() (this=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread.cpp:515
#9  0x00007f9fc009b423 in QThreadPrivate::start(void*) (arg=0x2c739c0) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread_unix.cpp:368
#10 0x00007f9fbc99f184 in start_thread () at /lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007f9fbf4b003d in clone () at /lib/x86_64-linux-gnu/libc.so.6

Thread 6 (Thread 0x7f9f918a1700 (LWP 28967)):
#0  0x00007f9fb5aee47c in g_mutex_get_impl (mutex=<optimized out>) at gthread-posix.c:125
#1  0x00007f9fb5aee47c in g_mutex_lock (mutex=<optimized out>) at gthread-posix.c:214
#2  0x00007f9fb5aee47c in g_main_context_prepare (context=0x7f9f88000990, priority=0x7f9f918a086c) at gmain.c:3483
#3  0x00007f9fb5aef5b8 in g_main_context_iterate (context=<optimized out>, block=<optimized out>, dispatch=<optimized out>, self=<optimized out>) at gmain.c:3888
#4  0x00007f9fb5aefa21 in g_main_context_iteration (context=0x7f9f88000990, may_block=1) at gmain.c:3969
#5  0x00007f9fc02965db in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f880008c0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:425
#6  0x00007f9fc0242472 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f918a0978, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:134
#7  0x00007f9fc0242472 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f918a0978, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:212
#8  0x00007f9fc0097867 in QThread::exec() (this=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread.cpp:515
#9  0x00007f9fc009b423 in QThreadPrivate::start(void*) (arg=0x7f9fc6cf47c8 <KDevelop::(anonymous namespace)::Q_QGS_s_parsingThread::innerFunction()::holder+8>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread_unix.cpp:368
#10 0x00007f9fbc99f184 in start_thread () at /lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007f9fbf4b003d in clone () at /lib/x86_64-linux-gnu/libc.so.6

Thread 5 (Thread 0x7f9f98c12700 (LWP 28962)):
#0  0x00007f9fbf4bdc37 in pthread_mutex_lock () at /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f9fb5aef7d2 in g_mutex_lock (mutex=<optimized out>) at gthread-posix.c:214
#2  0x00007f9fb5aef7d2 in g_main_context_iterate (context=<optimized out>, block=<optimized out>, dispatch=<optimized out>, self=<optimized out>) at gmain.c:3912
#3  0x00007f9fb5aefa21 in g_main_context_iteration (context=0x7f9f8c000990, may_block=1) at gmain.c:3969
#4  0x00007f9fc02965db in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f8c0008c0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:425
#5  0x00007f9fc0242472 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f98c118f8, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:134
#6  0x00007f9fc0242472 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f98c118f8, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:212
#7  0x00007f9fc0097867 in QThread::exec() (this=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread.cpp:515
#8  0x00007f9fc71fb0fe in KDevelop::DUChainPrivate::CleanupThread::run() (this=0x2c1f8d0) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_kf5-kdevelop/kf5-kdevelop-devel/work/kf5-kdevelop-5/kdevplatform/language/duchain/duchain.cpp:331
#9  0x00007f9fc009b423 in QThreadPrivate::start(void*) (arg=0x2c1f8d0) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread_unix.cpp:368
#10 0x00007f9fbc99f184 in start_thread () at /lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007f9fbf4b003d in clone () at /lib/x86_64-linux-gnu/libc.so.6

Thread 4 (Thread 0x7f9f9c0ba700 (LWP 28818)):
#0  0x00007f9fbf4bddd0 in  () at /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f9fbf4a2ca9 in poll () at /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007f9fb5aef761 in g_main_context_poll (priority=0, context=<optimized out>, timeout=<optimized out>, fds=<optimized out>, n_fds=<optimized out>) at gmain.c:4209
#3  0x00007f9fb5aef761 in g_main_context_iterate (context=<optimized out>, block=<optimized out>, dispatch=<optimized out>, self=<optimized out>) at gmain.c:3903
#4  0x00007f9fb5aefa21 in g_main_context_iteration (context=0x7f9f94000990, may_block=1) at gmain.c:3969
#5  0x00007f9fc02965db in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f940008c0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:425
#6  0x00007f9fc0242472 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f9c0b9948, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:134
#7  0x00007f9fc0242472 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f9f9c0b9948, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:212
#8  0x00007f9fc0097867 in QThread::exec() (this=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread.cpp:515
#9  0x00007f9fc1815630 in QDBusConnectionManager::run() (this=0x7f9fc1a752e0 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/dbus/qdbusconnection.cpp:178
#10 0x00007f9fc009b423 in QThreadPrivate::start(void*) (arg=0x7f9fc1a752e0 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread_unix.cpp:368
#11 0x00007f9fbc99f184 in start_thread () at /lib/x86_64-linux-gnu/libpthread.so.0
#12 0x00007f9fbf4b003d in clone () at /lib/x86_64-linux-gnu/libc.so.6

Thread 3 (Thread 0x7f9fa37d5700 (LWP 28817)):
#0  0x00007f9fbc9a3404 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f9fa89d7b2b in cnd_wait (cond=<optimized out>, mtx=<optimized out>) at ../mesa-18.3.3/src/../include/c11/threads_posix.h:155
#2  0x00007f9fa89d7b2b in util_queue_thread_func (input=<optimized out>) at ../mesa-18.3.3/src/util/u_queue.c:270
#3  0x00007f9fa89d8446 in impl_thrd_routine (p=<optimized out>) at ../mesa-18.3.3/src/../include/c11/threads_posix.h:87
#4  0x00007f9fbc99f184 in start_thread () at /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007f9fbf4b003d in clone () at /lib/x86_64-linux-gnu/libc.so.6

Thread 2 (Thread 0x7f9faa4ac700 (LWP 28816)):
#0  0x00007f9fbf4a2c9d in poll () at /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f9fb4567ab2 in _xcb_conn_wait () at /opt/local/lib/libxcb.so.1
#2  0x00007f9fb4569eba in xcb_wait_for_event () at /opt/local/lib/libxcb.so.1
#3  0x00007f9fac400f49 in QXcbEventReader::run() (this=0x1a5b070) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1330
#4  0x00007f9fc009b423 in QThreadPrivate::start(void*) (arg=0x1a5b070) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread_unix.cpp:368
#5  0x00007f9fbc99f184 in start_thread () at /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007f9fbf4b003d in clone () at /lib/x86_64-linux-gnu/libc.so.6

Thread 1 (Thread 0x7f9fc88a3c80 (LWP 28813)):
[KCrash Handler]
#6  0x00007f9fc1e6684d in QWidgetPrivate::maybeTopData() const (this=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/widgets/kernel/qwidget_p.h:967
#7  0x00007f9fc1e6684d in QWidget::windowHandle() const (this=0x2681ea0) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/widgets/kernel/qwidget.cpp:2646
#8  0x00007f9fc43c00f2 in KJobWidgets::setWindow(KJob*, QWidget*) (job=0x7986050, widget=0x2681ea0) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_KF5-Frameworks/kf5-kjobwidgets/work/kjobwidgets-5.60.0/src/kjobwidgets.cpp:30
#9  0x00007f9fc3cea963 in KCoreDirListerCache::updateDirectory(QUrl const&) (this=<optimized out>, _dir=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_KF5-Frameworks/kf5-kio/work/kio-5.60.0/src/core/kcoredirlister.cpp:720
#10 0x00007f9fc3cd8ca7 in KCoreDirListerCache::processPendingUpdates() (this=0x7f9fc3f49af0 <_ZZN12_GLOBAL__N_121Q_QGS_kDirListerCache13innerFunctionEvE6holder.llvm.15E8D9A>) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_KF5-Frameworks/kf5-kio/work/kio-5.60.0/src/core/kcoredirlister.cpp:2026
#11 0x00007f9fc0275565 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (this=<optimized out>, r=<optimized out>, a=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:378
#12 0x00007f9fc0275565 in QMetaObject::activate(QObject*, int, int, void**) (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=0x7ffe32437ba0) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qobject.cpp:3755
#13 0x00007f9fc027ce74 in QTimer::timeout(QTimer::QPrivateSignal) (this=<optimized out>, _t1=...) at .moc/moc_qtimer.cpp:200
#14 0x00007f9fc027ce74 in QTimer::timerEvent(QTimerEvent*) (this=0x7f9fc3f49b70 <_ZZN12_GLOBAL__N_121Q_QGS_kDirListerCache13innerFunctionEvE6holder.llvm.15E8D9A+128>, e=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qtimer.cpp:255
#15 0x00007f9fc026e3ad in QObject::event(QEvent*) (this=0x7f9fc3f49b70 <_ZZN12_GLOBAL__N_121Q_QGS_kDirListerCache13innerFunctionEvE6holder.llvm.15E8D9A+128>, e=0x7ffe32437828) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qobject.cpp:1239
#16 0x00007f9fc1e44801 in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x7f9fc3f49b70 <_ZZN12_GLOBAL__N_121Q_QGS_kDirListerCache13innerFunctionEvE6holder.llvm.15E8D9A+128>, e=0x7ffe32437f50) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/widgets/kernel/qapplication.cpp:3722
#17 0x00007f9fc1e45b69 in QApplication::notify(QObject*, QEvent*) (this=0x7ffe32438400, receiver=0x7f9fc3f49b70 <_ZZN12_GLOBAL__N_121Q_QGS_kDirListerCache13innerFunctionEvE6holder.llvm.15E8D9A+128>, e=0x7ffe32437f50) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/widgets/kernel/qapplication.cpp:3093
#18 0x00007f9fc02465e6 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x7f9fc3f49b70 <_ZZN12_GLOBAL__N_121Q_QGS_kDirListerCache13innerFunctionEvE6holder.llvm.15E8D9A+128>, event=0x7ffe32437f50) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qcoreapplication.cpp:1031
#19 0x00007f9fc02957fa in QCoreApplication::sendEvent(QObject*, QEvent*) (receiver=0x2681ea0, event=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#20 0x00007f9fc02957fa in QTimerInfoList::activateTimers() (this=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qtimerinfo_unix.cpp:643
#21 0x00007f9fc0296dea in timerSourceDispatch(_GSource*, int (*)(void*), void*) (source=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:182
#22 0x00007f9fb5aef0e5 in g_main_dispatch (context=<optimized out>) at gmain.c:3170
#23 0x00007f9fb5aef0e5 in g_main_context_dispatch (context=<optimized out>) at gmain.c:3835
#24 0x00007f9fb5aef7b5 in g_main_context_iterate (context=<optimized out>, block=<optimized out>, dispatch=<optimized out>, self=<optimized out>) at gmain.c:3908
#25 0x00007f9fb5aefa21 in g_main_context_iteration (context=0x7f9fa4003030, may_block=1) at gmain.c:3969
#26 0x00007f9fc02965db in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x1c5d0a0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:425
#27 0x00007f9fc0242472 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ffe324381c0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:134
#28 0x00007f9fc0242472 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ffe324381c0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:212
#29 0x00007f9fc0246cad in QCoreApplication::exec() () at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qcoreapplication.cpp:1304
#30 0x00000000004138fa in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_kf5-kdevelop/kf5-kdevelop-devel/work/kf5-kdevelop-5/app/main.cpp:1008

The reporter indicates this bug may be a duplicate of or related to bug 413509.

Possible duplicates by query: bug 420516, bug 413509, bug 351909, bug 348427, bug 347261.

Report to https://bugs.kde.org/

The only use of KDirLister I could find that might explain this crash is in the filemanager plugin. It's a bit early to confirm, but I haven't seen any of these crashes since running the patch below (which in any way shouldn't hurt). If I do get another of these crashes I should be able to see whether this dirlister is the culprit, at least.

diff --git plugins/filemanager/filemanager.cpp plugins/filemanager/filemanager.cpp
index 2e0b548b9e67766f695eaa5841b13784f42955cf..3a2a08151d2611b49908953d4215d0067b0a465b 100644
--- plugins/filemanager/filemanager.cpp
+++ plugins/filemanager/filemanager.cpp
@@ -88,6 +88,11 @@ FileManager::FileManager(KDevFileManagerPlugin *plugin, QWidget* parent)
     // Connect the bookmark handler
     connect(m_bookmarkHandler, &BookmarkHandler::openUrl, this, &FileManager::gotoUrl);
     connect(m_bookmarkHandler, &BookmarkHandler::openUrl, this, &FileManager::updateNav);
+    connect(KDevelop::ICore::self(), &KDevelop::ICore::aboutToShutdown, [this](){
+        qCDebug(PLUGIN_FILEMANAGER) << "Shutting down: closing" << this;
+        dirop->close();
+        dirop->dirLister()->setMainWindow(nullptr);
+    } );
 }
 
 FileManager::~FileManager()

Thank you for reporting this crash in KDE software. As it has been a while since this issue was reported, can we please ask you to see if you can reproduce the crash with a recent software version?

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This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!