Bug 386137

Summary: Discover crashes when typing certain application names into search.
Product: [Applications] Discover Reporter: B Jiang <bjiang738>
Component: discoverAssignee: Aleix Pol <aleixpol>
Status: RESOLVED DUPLICATE    
Severity: crash CC: nate, stephen.p.ford
Priority: NOR Keywords: drkonqi
Version: 5.10.5   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: New crash information added by DrKonqi

Description B Jiang 2017-10-24 11:17:09 UTC 
Application: plasma-discover (5.10.5)

Qt Version: 5.9.1
Frameworks Version: 5.38.0
Operating System: Linux 4.13.0-16-generic x86_64
Distribution: Ubuntu 17.10

-- Information about the crash:
Attempting to type "qtcreator" into discover search crashes halfway.

Steps to reproduce:
1. Open Discover.
2. Begin typing "qtcreator".

Actual results:
Discover crashes around 50% of the time, not always on the same letter. Does not happen with other strings.

Expected results:
Discover searches for "qtcreator"

Additional information
Occurs both when qtcreator is installed and not.

The crash can be reproduced sometimes.

-- 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 0x7fb17e0c55c0 (LWP 8483))]

Thread 16 (Thread 0x7fb119c7d700 (LWP 8503)):
#0  0x00007fb17606c072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55f64e760afc) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55f64e760aa8, cond=0x55f64e760ad0) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55f64e760ad0, mutex=0x55f64e760aa8) at pthread_cond_wait.c:655
#3  0x00007fb15896eb8b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fb15896eaa7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fb1760657fc in start_thread (arg=0x7fb119c7d700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7fb11a47e700 (LWP 8501)):
#0  0x00007fb1797ebffd in __GI___libc_read (fd=24, buf=0x7fb11a47da90, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007fb1741ea280 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb1741a5c4b in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb1741a6110 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb1741a627c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb17a13049b in QEventDispatcherGlib::processEvents (this=0x7fb110000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007fb17a0d5e3a in QEventLoop::exec (this=this@entry=0x7fb11a47dcb0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#7  0x00007fb179ef53ca in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#8  0x00007fb179efa29d in QThreadPrivate::start (arg=0x55f64e6c9ca0) at thread/qthread_unix.cpp:368
#9  0x00007fb1760657fc in start_thread (arg=0x7fb11a47e700) at pthread_create.c:465
#10 0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7fb11b88a700 (LWP 8499)):
#0  0x00007fb1797ebffd in __GI___libc_read (fd=20, buf=0x7fb11b889a90, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007fb1741ea280 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb1741a5c4b in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb1741a6110 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb1741a627c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb17a13049b in QEventDispatcherGlib::processEvents (this=0x7fb114000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007fb17a0d5e3a in QEventLoop::exec (this=this@entry=0x7fb11b889cb0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#7  0x00007fb179ef53ca in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#8  0x00007fb179efa29d in QThreadPrivate::start (arg=0x55f64e5dbc20) at thread/qthread_unix.cpp:368
#9  0x00007fb1760657fc in start_thread (arg=0x7fb11b88a700) at pthread_create.c:465
#10 0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7fb138b2b700 (LWP 8498)):
#0  0x00007fb1741eb5d4 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fb1741a5037 in g_main_context_acquire () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb1741a6025 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb1741a627c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb17a13049b in QEventDispatcherGlib::processEvents (this=0x7fb128000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007fb17a0d5e3a in QEventLoop::exec (this=this@entry=0x7fb138b2acb0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007fb179ef53ca in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#7  0x00007fb179efa29d in QThreadPrivate::start (arg=0x55f64e358420) at thread/qthread_unix.cpp:368
#8  0x00007fb1760657fc in start_thread (arg=0x7fb138b2b700) at pthread_create.c:465
#9  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7fb13bfff700 (LWP 8496)):
#0  QMutex::lock (this=this@entry=0x55f64c11b720) at thread/qmutex.cpp:224
#1  0x00007fb17a1308ab in QMutexLocker::QMutexLocker (m=0x55f64c11b720, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:200
#2  QThreadData::canWaitLocked (this=0x55f64c11b6f0) at ../../include/QtCore/5.9.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:253
#3  postEventSourcePrepare (timeout=<synthetic pointer>, s=0x7fb124004b90) at kernel/qeventdispatcher_glib.cpp:259
#4  postEventSourceCheck (source=0x7fb124004b90) at kernel/qeventdispatcher_glib.cpp:269
#5  0x00007fb1741a5b71 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fb1741a6110 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fb1741a627c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fb17a13049b in QEventDispatcherGlib::processEvents (this=0x7fb124000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#9  0x00007fb17a0d5e3a in QEventLoop::exec (this=this@entry=0x7fb13bffec40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#10 0x00007fb179ef53ca in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#11 0x00007fb17d37f846 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fb179efa29d in QThreadPrivate::start (arg=0x55f64c1a1750) at thread/qthread_unix.cpp:368
#13 0x00007fb1760657fc in start_thread (arg=0x7fb13bfff700) at pthread_create.c:465
#14 0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7fb14c90d700 (LWP 8494)):
#0  0x00007fb17606c072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55f64bf4e184) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55f64bf4e130, cond=0x55f64bf4e158) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55f64bf4e158, mutex=0x55f64bf4e130) at pthread_cond_wait.c:655
#3  0x00007fb15896eb8b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fb15896eaa7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fb1760657fc in start_thread (arg=0x7fb14c90d700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fb14d10e700 (LWP 8493)):
#0  0x00007fb17606c072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55f64bf4e180) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55f64bf4e130, cond=0x55f64bf4e158) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55f64bf4e158, mutex=0x55f64bf4e130) at pthread_cond_wait.c:655
#3  0x00007fb15896eb8b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fb15896eaa7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fb1760657fc in start_thread (arg=0x7fb14d10e700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fb14d90f700 (LWP 8492)):
#0  0x00007fb17606c072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55f64bf4e098) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55f64bf4e048, cond=0x55f64bf4e070) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55f64bf4e070, mutex=0x55f64bf4e048) at pthread_cond_wait.c:655
#3  0x00007fb15896eb8b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fb15896eaa7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fb1760657fc in start_thread (arg=0x7fb14d90f700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fb14e110700 (LWP 8491)):
#0  0x00007fb17606c072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55f64bf4e09c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55f64bf4e048, cond=0x55f64bf4e070) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55f64bf4e070, mutex=0x55f64bf4e048) at pthread_cond_wait.c:655
#3  0x00007fb15896eb8b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fb15896eaa7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fb1760657fc in start_thread (arg=0x7fb14e110700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fb14e911700 (LWP 8490)):
#0  0x00007fb17606c072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55f64bf4e09c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55f64bf4e048, cond=0x55f64bf4e070) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55f64bf4e070, mutex=0x55f64bf4e048) at pthread_cond_wait.c:655
#3  0x00007fb15896eb8b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fb15896eaa7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fb1760657fc in start_thread (arg=0x7fb14e911700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fb14f34c700 (LWP 8489)):
#0  0x00007fb17606c072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fb164004690) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7fb164004640, cond=0x7fb164004668) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7fb164004668, mutex=0x7fb164004640) at pthread_cond_wait.c:655
#3  0x00007fb15896eb8b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fb15896eaa7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fb1760657fc in start_thread (arg=0x7fb14f34c700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fb150174700 (LWP 8488)):
#0  0x00007fb17606c072 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55f64bf4d8d4) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55f64bf4d880, cond=0x55f64bf4d8a8) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55f64bf4d8a8, mutex=0x55f64bf4d880) at pthread_cond_wait.c:655
#3  0x00007fb15896eb8b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fb15896eaa7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fb1760657fc in start_thread (arg=0x7fb150174700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fb160cb1700 (LWP 8487)):
#0  0x00007fb1797f0901 in __GI___poll (fds=0x7fb1540029e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb1741a6169 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb1741a627c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb17a13049b in QEventDispatcherGlib::processEvents (this=0x7fb154000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007fb17a0d5e3a in QEventLoop::exec (this=this@entry=0x7fb160cb0c90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#5  0x00007fb179ef53ca in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#6  0x00007fb17ab00f45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fb179efa29d in QThreadPrivate::start (arg=0x55f64be7be60) at thread/qthread_unix.cpp:368
#8  0x00007fb1760657fc in start_thread (arg=0x7fb160cb1700) at pthread_create.c:465
#9  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fb161ec2700 (LWP 8486)):
#0  0x00007fb1741eb5b9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fb1741a5b7c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb1741a6110 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb1741a627c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb17a13049b in QEventDispatcherGlib::processEvents (this=0x7fb15c000b10, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007fb17a0d5e3a in QEventLoop::exec (this=this@entry=0x7fb161ec1c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007fb179ef53ca in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#7  0x00007fb17c284e45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007fb179efa29d in QThreadPrivate::start (arg=0x7fb17c4f7d60) at thread/qthread_unix.cpp:368
#9  0x00007fb1760657fc in start_thread (arg=0x7fb161ec2700) at pthread_create.c:465
#10 0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fb16aa16700 (LWP 8485)):
#0  0x00007fb1797f0901 in __GI___poll (fds=0x7fb16aa15bb8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb173f3f747 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fb173f4153a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fb16cf70f09 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fb179efa29d in QThreadPrivate::start (arg=0x55f64bdc64f0) at thread/qthread_unix.cpp:368
#5  0x00007fb1760657fc in start_thread (arg=0x7fb16aa16700) at pthread_create.c:465
#6  0x00007fb1797fcb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fb17e0c55c0 (LWP 8483)):
[KCrash Handler]
#6  0x0000000100000001 in ?? ()
#7  0x00007fb17a10ace2 in QObjectPrivate::connectImpl (sender=sender@entry=0x55f64e5f9f20, signal_index=9, receiver=receiver@entry=0x55f64e6c7ab0, slot=slot@entry=0x7ffc1cd93f20, slotObj=slotObj@entry=0x7fb16400ab60, type=<optimized out>, types=<optimized out>, senderMetaObject=<optimized out>) at kernel/qobject.cpp:4847
#8  0x00007fb17a10aeb2 in QObject::connectImpl (sender=sender@entry=0x55f64e5f9f20, signal=signal@entry=0x7ffc1cd93f10, receiver=0x55f64e6c7ab0, slot=slot@entry=0x7ffc1cd93f20, slotObj=0x7fb16400ab60, type=Qt::AutoConnection, types=0x0, senderMetaObject=0x7fb11d6f6c20 <KNSBackend::staticMetaObject>) at kernel/qobject.cpp:4784
#9  0x00007fb11d4e6336 in QObject::connect<void (KNSBackend::*)(QVector<AbstractResource*> const&), void (ResultsStream::*)(QVector<AbstractResource*> const&)> (type=Qt::AutoConnection, slot=(void (ResultsStream::*)(ResultsStream * const, const QVector<AbstractResource*> &)) 0x7fb17d038670 <ResultsStream::resourcesFound(QVector<AbstractResource*> const&)>, receiver=<optimized out>, signal=(void (KNSBackend::*)(KNSBackend * const, const QVector<AbstractResource*> &)) 0x7fb11d4f1120 <KNSBackend::receivedResources(QVector<AbstractResource*> const&)>, sender=0x55f64e5f9f20) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobject.h:259
#10 KNSBackend::<lambda()>::operator() (__closure=0x55f64eaf6ca0) at ./libdiscover/backends/KNSBackend/KNSBackend.cpp:357
#11 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KNSBackend::searchStream(const QString&)::<lambda()> >::call (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:130
#12 QtPrivate::Functor<KNSBackend::searchStream(const QString&)::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:240
#13 QtPrivate::QFunctorSlotObject<KNSBackend::searchStream(const QString&)::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=0x55f64eaf6c90, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobject_impl.h:168
#14 0x00007fb17a107452 in QObject::event (this=0x55f64e6c7ab0, e=<optimized out>) at kernel/qobject.cpp:1246
#15 0x00007fb17b6d646c in QApplicationPrivate::notify_helper (this=this@entry=0x55f64bd9d290, receiver=receiver@entry=0x55f64e6c7ab0, e=e@entry=0x55f64e603320) at kernel/qapplication.cpp:3717
#16 0x00007fb17b6ddd34 in QApplication::notify (this=0x7ffc1cd94550, receiver=0x55f64e6c7ab0, e=0x55f64e603320) at kernel/qapplication.cpp:3476
#17 0x00007fb17a0d7de8 in QCoreApplication::notifyInternal2 (receiver=0x55f64e6c7ab0, event=event@entry=0x55f64e603320) at kernel/qcoreapplication.cpp:1018
#18 0x00007fb17a0da55d in QCoreApplication::sendEvent (event=0x55f64e603320, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#19 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x55f64bda2df0) at kernel/qcoreapplication.cpp:1678
#20 0x00007fb17a0daae8 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1532
#21 0x00007fb17a130e53 in postEventSourceDispatch (s=0x55f64bdff0f0) at kernel/qeventdispatcher_glib.cpp:276
#22 0x00007fb1741a5fb7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fb1741a61f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fb1741a627c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fb17a13047f in QEventDispatcherGlib::processEvents (this=0x55f64be05dc0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#26 0x00007fb17a0d5e3a in QEventLoop::exec (this=this@entry=0x7ffc1cd94490, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#27 0x00007fb17a0deda4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1291
#28 0x000055f64aab4fa8 in main (argc=<optimized out>, argv=<optimized out>) at ./discover/main.cpp:151

Reported using DrKonqi
Comment 1 stephen.p.ford 2017-10-26 20:02:03 UTC 
Created attachment 108578 [details]
New crash information added by DrKonqi

plasma-discover (5.10.5) using Qt 5.9.1

- What I was doing when the application crashed:

Opened Discover, searched for an app ("KCharSelect")

-- Backtrace (Reduced):
#6  0x0000000100000001 in  ()
#7  0x00007f0ded443ce2 in QObjectPrivate::connectImpl(QObject const*, int, QObject const*, void**, QtPrivate::QSlotObjectBase*, Qt::ConnectionType, int const*, QMetaObject const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f0ded443eb2 in QObject::connectImpl(QObject const*, void**, QObject const*, void**, QtPrivate::QSlotObjectBase*, Qt::ConnectionType, int const*, QMetaObject const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f0dbbd20336 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/kns-backend.so
#10 0x00007f0ded440452 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
Comment 2 Nate Graham 2017-11-07 17:34:19 UTC 

*** This bug has been marked as a duplicate of bug 385679 ***