Bug 392859

Summary: Discovers crashes
Product: [Applications] Discover Reporter: Guillaume Fayard <guillaume2.fayard>
Component: discoverAssignee: Aleix Pol <aleixpol>
Status: RESOLVED FIXED    
Severity: normal CC: nate, rikmills
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.12.4   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Guillaume Fayard 2018-04-08 07:47:25 UTC 
Application: plasma-discover (5.12.4)

Qt Version: 5.9.4
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-13-generic x86_64
Distribution: Ubuntu Bionic Beaver (development branch)

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

Discovers crashes when clicking on Settings. This happens every time. It happens on a fresh install of Kubuntu 18.04 Beta 2.

The crash can be reproduced every time.

-- Backtrace:
Application: Découvrir (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc2059c6f40 (LWP 1817))]

Thread 9 (Thread 0x7fc1bec9f700 (LWP 1825)):
#0  0x00007fc1fb9a0360 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fc1fb9a28d3 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc1fb9a336b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc1fb9a354c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc201a004fb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc2019a561a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc2017c422a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc2017c916d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc1fd8c86db in start_thread (arg=0x7fc1bec9f700) at pthread_create.c:463
#9  0x00007fc2010c188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fc1ce29c700 (LWP 1824)):
#0  0x00007fc1fd8ceed9 in futex_reltimed_wait_cancelable (private=<optimized out>, reltime=0x7fc1ce29bc40, expected=0, futex_word=0x7fc1c0006df4) at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  __pthread_cond_wait_common (abstime=0x7fc1ce29bd00, mutex=0x7fc1c0006da0, cond=0x7fc1c0006dc8) at pthread_cond_wait.c:533
#2  __pthread_cond_timedwait (cond=0x7fc1c0006dc8, mutex=0x7fc1c0006da0, abstime=0x7fc1ce29bd00) at pthread_cond_wait.c:667
#3  0x00007fc2017ca458 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc2017c652d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc2017c916d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc1fd8c86db in start_thread (arg=0x7fc1ce29c700) at pthread_create.c:463
#7  0x00007fc2010c188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fc1cea9d700 (LWP 1823)):
#0  0x00007fc2010b4bf9 in __GI___poll (fds=0x557c902d7030, nfds=1, timeout=120106) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc1fb9a3439 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc1fb9a354c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc201a004fb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc2019a561a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc2017c422a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc2017c916d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc1fd8c86db in start_thread (arg=0x7fc1cea9d700) at pthread_create.c:463
#8  0x00007fc2010c188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fc1d001e700 (LWP 1822)):
#0  0x00007fc1fb9a33ee in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fc1fb9a354c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc201a004fb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fc2019a561a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc2017c422a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc2017c916d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc1fd8c86db in start_thread (arg=0x7fc1d001e700) at pthread_create.c:463
#7  0x00007fc2010c188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fc1d9729700 (LWP 1821)):
#0  0x00007fc1fb9e8cf4 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fc1fb9a2930 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc1fb9a336b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc1fb9a354c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc201a004fb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc2019a561a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc2017c422a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc204ba1086 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fc2017c916d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fc1fd8c86db in start_thread (arg=0x7fc1d9729700) at pthread_create.c:463
#10 0x00007fc2010c188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fc1e8a5e700 (LWP 1820)):
#0  0x00007fc2010b00b4 in __GI___libc_read (fd=9, buf=0x7fc1e8a5db70, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fc1fb9e7960 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc1fb9a2f27 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc1fb9a33e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc1fb9a354c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc201a004fb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc2019a561a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc2017c422a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc2023d8a45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fc2017c916d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc1fd8c86db in start_thread (arg=0x7fc1e8a5e700) at pthread_create.c:463
#11 0x00007fc2010c188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fc1e9c6f700 (LWP 1819)):
#0  0x00007fc2010b00b4 in __GI___libc_read (fd=7, buf=0x7fc1e9c6eb60, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fc1fb9e7960 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc1fb9a2f27 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc1fb9a33e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fc1fb9a354c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fc201a004fb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc2019a561a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fc2017c422a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc203b63d45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007fc2017c916d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc1fd8c86db in start_thread (arg=0x7fc1e9c6f700) at pthread_create.c:463
#11 0x00007fc2010c188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fc1f3074700 (LWP 1818)):
#0  0x00007fc2010b4bf9 in __GI___poll (fds=0x7fc1f3073ca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc1fb73a747 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fc1fb73c36a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fc1f5e211c9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fc2017c916d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc1fd8c86db in start_thread (arg=0x7fc1f3074700) at pthread_create.c:463
#6  0x00007fc2010c188f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fc2059c6f40 (LWP 1817)):
[KCrash Handler]
#6  0x00007fc204847b19 in AbstractResourcesBackend::Filters::shouldFilter(AbstractResource*) const () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#7  0x00007fc204847ded in AbstractResourcesBackend::Filters::filterJustInCase(QVector<AbstractResource*>&) const () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#8  0x00007fc20483f422 in ResourcesProxyModel::addResources(QVector<AbstractResource*> const&) () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#9  0x00007fc2019d62bf in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc2048583d2 in ResultsStream::resourcesFound(QVector<AbstractResource*> const&) () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#11 0x00007fc2048375e0 in AggregatedResultsStream::emitResults() () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#12 0x00007fc204837639 in AggregatedResultsStream::clear() () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#13 0x00007fc2048387b3 in AggregatedResultsStream::destruction(QObject*) () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#14 0x00007fc2019d62bf in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007fc2019d691f in QObject::destroyed(QObject*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007fc2019dd03a in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fc2048476b9 in ResultsStream::~ResultsStream() () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#18 0x00007fc2019d6d30 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fc202fb282c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007fc202fba0f4 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007fc2019a75c8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fc2019a9d3d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007fc201a00eb3 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fc1fb9a3287 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fc1fb9a34c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007fc1fb9a354c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007fc201a004df in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007fc2019a561a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007fc2019ae664 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x0000557c8e521f58 in ?? ()
#31 0x00007fc200fc1b97 in __libc_start_main (main=0x557c8e521680, argc=1, argv=0x7ffe8cf4efc8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe8cf4efb8) at ../csu/libc-start.c:310
#32 0x0000557c8e52213a in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 390480.

Possible duplicates by query: bug 390611, bug 390480, bug 390129, bug 386474, bug 385554.

Reported using DrKonqi
Comment 1 Aleix Pol 2018-04-09 00:41:36 UTC 
I'm running Ubuntu Bionic on my desktop system and I can't reproduce there.
Comment 2 Guillaume Fayard 2018-04-09 17:55:49 UTC 
Maybe I was on Plasma using Wayland, cannot remember. (I don't know if this could be related to the bug.) Anyway, now it's not happening anymore (after updates).
Comment 3 Aleix Pol 2018-04-10 08:23:49 UTC 
Assuming fixed, please reopen if the issue happens again.