Application: plasma-discover (5.8.8)

Qt Version: 5.6.1
Frameworks Version: 5.36.0
Operating System: Linux 4.4.0-101-generic x86_64
Distribution: Ubuntu 16.04.3 LTS

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

nothing, the only thing running this last time was Discover.  other times I had firefox running.  Aport (and sometimes other crash notices) also seems to crash often after Discover crashes during/after update (meaning the download bar(s) never seem to complete, then it crashes; though it doesn't prompt for those updates again.  I would like to upgrade from 16.04 but Discover does never shows any upgrades.  I did like the functionality of Mulan before Discover.

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f67d0a4e8c0 (LWP 1905))]

Thread 10 (Thread 0x7f6787fff700 (LWP 1923)):
#0  0x00007f67ca4d5a94 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f67ca490bf9 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f67ca491307 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f67ca49149c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f67cdef737b in QEventDispatcherGlib::processEvents (this=0x7f677c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007f67cde9fffa in QEventLoop::exec (this=this@entry=0x7f6787ffed00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f67cdcc89e4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007f67cdccd808 in QThreadPrivate::start (arg=0x23df820) at thread/qthread_unix.cpp:341
#8  0x00007f67cabfe6ba in start_thread (arg=0x7f6787fff700) at pthread_create.c:333
#9  0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f67989a9700 (LWP 1918)):
#0  0x00007f67ca4d5a94 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f67ca4914a6 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f67cdef737b in QEventDispatcherGlib::processEvents (this=0x7f67880008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#3  0x00007f67cde9fffa in QEventLoop::exec (this=this@entry=0x7f67989a8d00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#4  0x00007f67cdcc89e4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:500
#5  0x00007f67cdccd808 in QThreadPrivate::start (arg=0x2031700) at thread/qthread_unix.cpp:341
#6  0x00007f67cabfe6ba in start_thread (arg=0x7f67989a9700) at pthread_create.c:333
#7  0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f67998d1700 (LWP 1916)):
#0  0x00007f67cd2c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f67ca49138c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f67ca491712 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f679b0569d6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f67ca4b7bb5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f67cabfe6ba in start_thread (arg=0x7f67998d1700) at pthread_create.c:333
#6  0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f679a0d2700 (LWP 1915)):
#0  0x00007f67cd2c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f67ca49138c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f67ca49149c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f67ca4914d9 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f67ca4b7bb5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f67cabfe6ba in start_thread (arg=0x7f679a0d2700) at pthread_create.c:333
#6  0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f67ade09700 (LWP 1910)):
#0  0x00007f67ca490b30 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f67ca491307 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f67ca49149c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f67cdef737b in QEventDispatcherGlib::processEvents (this=0x7f679c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#4  0x00007f67cde9fffa in QEventLoop::exec (this=this@entry=0x7f67ade08d00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f67cdcc89e4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:500
#6  0x00007f67cdccd808 in QThreadPrivate::start (arg=0x7f67a4003650) at thread/qthread_unix.cpp:341
#7  0x00007f67cabfe6ba in start_thread (arg=0x7f67ade09700) at pthread_create.c:333
#8  0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f67ae60a700 (LWP 1909)):
#0  0x00007f67cd2c224d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f67ca4d46f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f67ca490e74 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f67ca491330 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f67ca49149c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f67cdef737b in QEventDispatcherGlib::processEvents (this=0x7f67a40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#6  0x00007f67cde9fffa in QEventLoop::exec (this=this@entry=0x7f67ae609c90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#7  0x00007f67cdcc89e4 in QThread::exec (this=this@entry=0x2013c90) at thread/qthread.cpp:500
#8  0x00007f67d030e7d6 in QQuickPixmapReader::run (this=0x2013c90) at util/qquickpixmapcache.cpp:817
#9  0x00007f67cdccd808 in QThreadPrivate::start (arg=0x2013c90) at thread/qthread_unix.cpp:341
#10 0x00007f67cabfe6ba in start_thread (arg=0x7f67ae60a700) at pthread_create.c:333
#11 0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f67b5bd1700 (LWP 1908)):
#0  0x00007f67ca4d5a79 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f67ca490dcc in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f67ca491330 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f67ca49149c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f67cdef737b in QEventDispatcherGlib::processEvents (this=0x7f67a80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#5  0x00007f67cde9fffa in QEventLoop::exec (this=this@entry=0x7f67b5bd0ce0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f67cdcc89e4 in QThread::exec (this=this@entry=0x1c22cd0) at thread/qthread.cpp:500
#7  0x00007f67ce64c6b5 in QQmlThreadPrivate::run (this=0x1c22cd0) at qml/ftw/qqmlthread.cpp:141
#8  0x00007f67cdccd808 in QThreadPrivate::start (arg=0x1c22cd0) at thread/qthread_unix.cpp:341
#9  0x00007f67cabfe6ba in start_thread (arg=0x7f67b5bd1700) at pthread_create.c:333
#10 0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f67b6de2700 (LWP 1907)):
#0  0x00007f67cd2c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f67ca49138c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f67ca49149c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f67cdef737b in QEventDispatcherGlib::processEvents (this=0x7f67b00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:419
#4  0x00007f67cde9fffa in QEventLoop::exec (this=this@entry=0x7f67b6de1cd0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f67cdcc89e4 in QThread::exec (this=this@entry=0x7f67d0c08d40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:500
#6  0x00007f67d0b95515 in QDBusConnectionManager::run (this=0x7f67d0c08d40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:189
#7  0x00007f67cdccd808 in QThreadPrivate::start (arg=0x7f67d0c08d40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:341
#8  0x00007f67cabfe6ba in start_thread (arg=0x7f67b6de2700) at pthread_create.c:333
#9  0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f67bf18e700 (LWP 1906)):
#0  0x00007f67cd2c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f67c8487c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f67c84898d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f67c16e4d29 in QXcbEventReader::run (this=0x1bb6020) at qxcbconnection.cpp:1325
#4  0x00007f67cdccd808 in QThreadPrivate::start (arg=0x1bb6020) at thread/qthread_unix.cpp:341
#5  0x00007f67cabfe6ba in start_thread (arg=0x7f67bf18e700) at pthread_create.c:333
#6  0x00007f67cd2d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f67d0a4e8c0 (LWP 1905)):
[KCrash Handler]
#6  0x00007f67cffce040 in Transaction::isActive() const () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#7  0x00007f67cffcfa5b in TransactionModel::progress() const () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#8  0x00007f67cffed4a5 in ?? () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#9  0x00007f67cfff02fb in TransactionModel::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#10 0x00007f67ce598319 in ReadAccessor::Direct (property=..., n=0x0, output=0x7ffc898c52d0, object=0x7f67d0207890) at jsruntime/qv4qobjectwrapper.cpp:129
#11 LoadProperty<ReadAccessor::Direct> (v4=0x1c3c7a0, object=0x7f67d0207890, property=..., notifier=0x0) at jsruntime/qv4qobjectwrapper.cpp:164
#12 0x00007f67ce5993c5 in QV4::QObjectWrapper::getProperty (engine=engine@entry=0x1c3c7a0, object=0x7f67d0207890, property=0x1fbe218, captureRequired=captureRequired@entry=true) at jsruntime/qv4qobjectwrapper.cpp:378
#13 0x00007f67ce599b4a in QV4::QObjectWrapper::getQmlProperty (this=0x7f67b4bd23e8, qmlContext=0x1f37cc0, name=0x7f67b4bd23e0, revisionMode=QV4::QObjectWrapper::IgnoreRevision, hasProperty=0x0, includeImports=<optimized out>) at jsruntime/qv4qobjectwrapper.cpp:318
#14 0x00007f67ce5ab69e in QV4::Object::get (hasProperty=0x0, name=<optimized out>, this=<optimized out>) at jsruntime/qv4object_p.h:298
#15 QV4::Runtime::getProperty (engine=0x1c3c7a0, object=..., nameIndex=<optimized out>) at jsruntime/qv4runtime.cpp:679
#16 0x00007f67b4170130 in ?? ()
#17 0x00007ffc898c5700 in ?? ()
#18 0x0000000000000002 in ?? ()
#19 0x0000000000000001 in ?? ()
#20 0x00007f67ce5b7cf0 in QQmlVMEMetaObject::metaCall (this=0x7f67b4bd2320, o=<optimized out>, c=2307675520, _id=-1262672928, a=0x1c3c7a0) at qml/qqmlvmemetaobject.cpp:876
#21 0x00007f67ce631724 in QV4::Object::call (d=0x7f67b4bd2320, this=0x7f67b411c800) at ../../include/QtQml/5.6.1/QtQml/private/../../../../../src/qml/jsruntime/qv4object_p.h:324
#22 QQmlJavaScriptExpression::evaluate (this=this@entry=0x1f84200, callData=callData@entry=0x7f67b4bd2320, isUndefined=isUndefined@entry=0x7ffc898c57ac) at qml/qqmljavascriptexpression.cpp:189
#23 0x00007f67ce631bc1 in QQmlJavaScriptExpression::evaluate (this=this@entry=0x1f84200, isUndefined=isUndefined@entry=0x7ffc898c57ac) at qml/qqmljavascriptexpression.cpp:149
#24 0x00007f67ce63947e in QQmlBinding::update (this=0x1f84200, flags=...) at qml/qqmlbinding.cpp:187
#25 0x00007f67ce63998e in QQmlBinding::refresh (this=<optimized out>) at qml/qqmlbinding.cpp:403
#26 0x00007f67ce610ace in QQmlNotifier::emitNotify (endpoint=<optimized out>, a=a@entry=0x0) at qml/qqmlnotifier.cpp:94
#27 0x00007f67ce5bc4ac in QQmlData::signalEmitted (object=0x7f67d0207890, index=31, a=0x0) at qml/qqmlengine.cpp:773
#28 0x00007f67cdece2b0 in QMetaObject::activate (sender=0x7f67d0207890, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3616
#29 0x00007f67cdecec24 in QtPrivate::QSlotObjectBase::call (a=0x7ffc898c73e0, r=0x7f67d0207890, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#30 QMetaObject::activate (sender=sender@entry=0x7f67d0207890, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7ffc898c73e0) at kernel/qobject.cpp:3715
#31 0x00007f67cdecf1b7 in QMetaObject::activate (sender=sender@entry=0x7f67d0207890, m=m@entry=0x7f67ce0e9da0 <QAbstractItemModel::staticMetaObject>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7ffc898c73e0) at kernel/qobject.cpp:3595
#32 0x00007f67cdf470b4 in QAbstractItemModel::rowsRemoved (this=this@entry=0x7f67d0207890, _t1=..., _t2=-1, _t3=-1) at .moc/moc_qabstractitemmodel.cpp:615
#33 0x00007f67cde4999b in QAbstractItemModel::endRemoveRows (this=0x7f67d0207890) at itemmodels/qabstractitemmodel.cpp:2678
#34 0x00007f67cffd0a9c in TransactionModel::removeTransaction(Transaction*) () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#35 0x00007f67cdecec24 in QtPrivate::QSlotObjectBase::call (a=0x7ffc898c75e0, r=0x7f67d0207890, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#36 QMetaObject::activate (sender=sender@entry=0x300be80, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffc898c75e0) at kernel/qobject.cpp:3715
#37 0x00007f67cdecf1b7 in QMetaObject::activate (sender=sender@entry=0x300be80, m=m@entry=0x7f67ce0e1820 <QObject::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffc898c75e0) at kernel/qobject.cpp:3595
#38 0x00007f67cdecf25f in QObject::destroyed (this=this@entry=0x300be80, _t1=_t1@entry=0x300be80) at .moc/moc_qobject.cpp:213
#39 0x00007f67cded5cf5 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:913
#40 0x00007f67cffe108d in ?? () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#41 0x00007f67cdecf750 in QObject::event (this=0x300be80, e=<optimized out>) at kernel/qobject.cpp:1247
#42 0x00007f67cee5eafc in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x300be80, e=0x215b180) at kernel/qapplication.cpp:3804
#43 0x00007f67cee64036 in QApplication::notify (this=0x7ffc898c7cc0, receiver=0x300be80, e=0x215b180) at kernel/qapplication.cpp:3561
#44 0x00007f67cdea22a8 in QCoreApplication::notifyInternal2 (receiver=0x300be80, event=event@entry=0x215b180) at kernel/qcoreapplication.cpp:1015
#45 0x00007f67cdea416a in QCoreApplication::sendEvent (event=0x215b180, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:225
#46 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1b9cde0) at kernel/qcoreapplication.cpp:1650
#47 0x00007f67cdea4628 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1508
#48 0x00007f67cdef6f53 in postEventSourceDispatch (s=0x1be7b30) at kernel/qeventdispatcher_glib.cpp:270
#49 0x00007f67ca491197 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#50 0x00007f67ca4913f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#51 0x00007f67ca49149c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#52 0x00007f67cdef735f in QEventDispatcherGlib::processEvents (this=0x1beae00, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#53 0x00007f67cde9fffa in QEventLoop::exec (this=this@entry=0x7ffc898c7be0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#54 0x00007f67cdea86bc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1285
#55 0x000000000040a2d5 in ?? ()
#56 0x00007f67cd1eb830 in __libc_start_main (main=0x409bc0, argc=3, argv=0x7ffc898c7e58, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc898c7e48) at ../csu/libc-start.c:291
#57 0x000000000040a419 in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 383413.

Possible duplicates by query: bug 387037, bug 386958, bug 386849, bug 386847, bug 386774.

Reported using DrKonqi