If this doesn't fix bug #332948, please remove it from the BUG: keyword, otherwise it will be automatically closed when pushing this commit.

The backtrace without this patch:
Thread 1 (Thread 0x7f0a25cc5dc0 (LWP 18492)):
[KCrash Handler]
#6 0x00007f0a1fe9b156 in KJob::isAutoDelete() const (this=0x1ae3410) at /g/5kde/frameworks/kcoreaddons/src/lib/jobs/kjob.cpp:333
#7 0x00007f0a1fe9a826 in KJob::finishJob(bool) (this=0x1ae3410, emitResult=true) at /g/5kde/frameworks/kcoreaddons/src/lib/jobs/kjob.cpp:112
#8 0x00007f0a1fe9aeff in KJob::emitResult() (this=0x1ae3410) at /g/5kde/frameworks/kcoreaddons/src/lib/jobs/kjob.cpp:293
#9 0x00007f0a21676cba in KIO::FileCopyJob::slotResult(KJob*) (this=0x1ae3410, job=0x21cbe50) at /g/5kde/frameworks/kio/src/core/filecopyjob.cpp:509
#10 0x00007f0a1fe9a126 in QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<KJob*>, void, void (KCompositeJob::*)(KJob*)>::call(void (KCompositeJob::*)(KJob*), KCompositeJob*, void) (f=&virtual KCompositeJob::slotResult(KJob*), o=0x1ae3410, arg=0x7ffe447f26f0) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:136
#11 0x00007f0a1fe99d14 in QtPrivate::FunctionPointer<void (KCompositeJob::*)(KJob*)>::call<QtPrivate::List<KJob*>, void>(void (KCompositeJob::*)(KJob*), KCompositeJob*, void) (f=&virtual KCompositeJob::slotResult(KJob*), o=0x1ae3410, arg=0x7ffe447f26f0) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:169
#12 0x00007f0a1fe9992d in QtPrivate::QSlotObject<void (KCompositeJob::*)(KJob*), QtPrivate::List<KJob*>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void, bool*) (which=1, this_=0x21d0040, r=0x1ae3410, a=0x7ffe447f26f0, ret=0x0) at /usr/include/qt5/QtCore/qobject_impl.h:120
#13 0x00007f0a1df9f73c in QMetaObject::activate(QObject*, int, int, void) () at /usr/lib64/libQt5Core.so.5
#14 0x00007f0a1fe9c6cb in KJob::result(KJob*, KJob::QPrivateSignal) (this=0x21cbe50, _t1=0x21cbe50, _t2=...) at /virtual/kde5/5kde/build/frameworks/kcoreaddons/src/lib/KF5CoreAddons_autogen/include/moc_kjob.cpp:570
#15 0x00007f0a1fe9a816 in KJob::finishJob(bool) (this=0x21cbe50, emitResult=true) at /g/5kde/frameworks/kcoreaddons/src/lib/jobs/kjob.cpp:109
#16 0x00007f0a1fe9aeff in KJob::emitResult() (this=0x21cbe50) at /g/5kde/frameworks/kcoreaddons/src/lib/jobs/kjob.cpp:293
#17 0x00007f0a2167e313 in KIO::SimpleJob::slotFinished() (this=0x21cbe50) at /g/5kde/frameworks/kio/src/core/simplejob.cpp:233
#18 0x00007f0a2167e42d in KIO::SimpleJob::slotError(int, QString const&) (this=0x21cbe50, err=115, errorText=...) at /g/5kde/frameworks/kio/src/core/simplejob.cpp:246
#19 0x00007f0a2167f336 in KIO::SimpleJob::qt_static_metacall(QObject*, QMetaObject::Call, int, void) (_o=0x21cbe50, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7ffe447f2a20) at /virtual/kde5/5kde/build/frameworks/kio/src/core/KF5KIOCore_autogen/include/moc_simplejob.cpp:104
#20 0x00007f0a1df9f63a in QMetaObject::activate(QObject*, int, int, void) () at /usr/lib64/libQt5Core.so.5
#21 0x00007f0a21665732 in KIO::SlaveInterface::error(int, QString const&) (this=0x1ba8950, _t1=115, _t2=...) at /virtual/kde5/5kde/build/frameworks/kio/src/core/KF5KIOCore_autogen/include/moc_slaveinterface.cpp:414
#22 0x00007f0a21663694 in KIO::SlaveInterface::dispatch(int, QByteArray const&) (this=0x1ba8950, _cmd=102, rawdata=...) at /g/5kde/frameworks/kio/src/core/slaveinterface.cpp:192
#23 0x00007f0a21663154 in KIO::SlaveInterface::dispatch() (this=0x1ba8950) at /g/5kde/frameworks/kio/src/core/slaveinterface.cpp:89
#24 0x00007f0a216676d0 in KIO::Slave::gotInput() (this=0x1ba8950) at /g/5kde/frameworks/kio/src/core/slave.cpp:406
#25 0x00007f0a216f7625 in KIO::Slave::qt_static_metacall(QObject*, QMetaObject::Call, int, void) (_o=0x1ba8950, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x7ffe447f2d80) at /virtual/kde5/5kde/build/frameworks/kio/src/core/KF5KIOCore_autogen/EWIEGA46WW/moc_slave.cpp:89
#26 0x00007f0a1df9f63a in QMetaObject::activate(QObject*, int, int, void) () at /usr/lib64/libQt5Core.so.5
#27 0x00007f0a2160d0ff in KIO::Connection::readyRead() (this=0x1b0c640) at /virtual/kde5/5kde/build/frameworks/kio/src/core/KF5KIOCore_autogen/include/moc_connection_p.cpp:144
#28 0x00007f0a2160bef7 in KIO::ConnectionPrivate::dequeue() (this=0x1fe9d20) at /g/5kde/frameworks/kio/src/core/connection.cpp:46
#29 0x00007f0a2160cf1c in KIO::Connection::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=0x1b0c640, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x22a98b0) at /virtual/kde5/5kde/build/frameworks/kio/src/core/KF5KIOCore_autogen/include/moc_connection_p.cpp:87
#30 0x00007f0a1dfa0022 in QObject::event(QEvent*) () at /usr/lib64/libQt5Core.so.5
#31 0x00007f0a1f3ceafc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#32 0x00007f0a1f3d5eb4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#33 0x00007f0a1df72128 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#34 0x00007f0a1df74715 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib64/libQt5Core.so.5

+1

Could you please check, while you are on KCoreAddons and KIO for other jobs that emitting result in same way?

You can discard this one in front of https://phabricator.kde.org/D9004