Bug 376162

Summary: Discover crashes while searching
Product: [Applications] Discover Reporter: Gabriel Samfira <samfiragabriel>
Component: discoverAssignee: Aleix Pol <aleixpol>
Status: RESOLVED FIXED    
Severity: crash CC: 2112871, abin.gecb, aleixpol
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.9.0   
Target Milestone: ---   
Platform: Neon   
OS: Linux   
Latest Commit: https://commits.kde.org/discover/cb2f989331684e80369991e753b756e070bc1337 Version Fixed/Implemented In:
Sentry Crash Report:

Description Gabriel Samfira 2017-02-07 21:56:13 UTC 
Application: plasma-discover (5.9.0)

Qt Version: 5.7.1
Frameworks Version: 5.30.0
Operating System: Linux 4.4.0-62-generic x86_64
Distribution: KDE neon User Edition 5.9

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

Started the application, and simply tried to search for a package

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 0x7f6bacf148c0 (LWP 2603))]

Thread 11 (Thread 0x7f6b2dffb700 (LWP 2659)):
#0  0x00007f6ba9241b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6ba461e38c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6ba461e49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6ba9e6a75b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6ba9e150ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6ba9c44f64 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f6ba66d66ba in start_thread (arg=0x7f6b2dffb700) at pthread_create.c:333
#8  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 10 (Thread 0x7f6b4cff9700 (LWP 2625)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f6ba9c4a936 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6ba9c461ea in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6ba66d66ba in start_thread (arg=0x7f6b4cff9700) at pthread_create.c:333
#5  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7f6b72bf3700 (LWP 2614)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f6ba9c4a936 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6ba9c461ea in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6ba66d66ba in start_thread (arg=0x7f6b72bf3700) at pthread_create.c:333
#5  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7f6b735fb700 (LWP 2613)):
#0  0x00007f6ba4662a94 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f6ba461d910 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6ba461e2bb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6ba461e49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f6ba9e6a75b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6ba9e150ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6ba9c44f64 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f6ba66d66ba in start_thread (arg=0x7f6b735fb700) at pthread_create.c:333
#9  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f6b73fff700 (LWP 2612)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f6ba9c4a936 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f6ba9c461ea in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6ba66d66ba in start_thread (arg=0x7f6b73fff700) at pthread_create.c:333
#5  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f6b799b0700 (LWP 2610)):
#0  0x00007f6ba9241b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6ba461e38c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6ba461e49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6ba9e6a75b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6ba9e150ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6ba9c44f64 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f6ba66d66ba in start_thread (arg=0x7f6b799b0700) at pthread_create.c:333
#8  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f6b908cc700 (LWP 2608)):
#0  0x00007f6ba9241b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6ba461e38c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6ba461e49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6ba9e6a75b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6ba9e150ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6ba9c44f64 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6bac58bfc6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f6ba66d66ba in start_thread (arg=0x7f6b908cc700) at pthread_create.c:333
#9  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f6b91de9700 (LWP 2606)):
#0  0x00007f6ba9241b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6ba461e38c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6ba461e49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6ba9e6a75b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6ba9e150ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6ba9c44f64 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6baa5bdbf5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f6ba66d66ba in start_thread (arg=0x7f6b91de9700) at pthread_create.c:333
#9  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f6b92ffa700 (LWP 2605)):
#0  0x00007f6ba9241b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6ba461e38c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f6ba461e49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f6ba9e6a75b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f6ba9e150ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6ba9c44f64 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f6bad059735 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f6ba66d66ba in start_thread (arg=0x7f6b92ffa700) at pthread_create.c:333
#9  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f6b9b79a700 (LWP 2604)):
#0  0x00007f6ba9241b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f6ba41b3c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f6ba41b58d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f6b9dcf2d79 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f6ba9c49b48 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f6ba66d66ba in start_thread (arg=0x7f6b9b79a700) at pthread_create.c:333
#6  0x00007f6ba924d82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f6bacf148c0 (LWP 2603)):
[KCrash Handler]
#6  0x00007f6baa52b432 in QQmlData::isSignalConnected(QAbstractDeclarativeData*, QObject const*, int) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f6ba9e4187a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f6bac2663d2 in ResultsStream::resourcesFound (this=<optimized out>, _t1=...) at /workspace/build/obj-x86_64-linux-gnu/libdiscover/moc_AbstractResourcesBackend.cpp:140
#9  0x00007f6b701c1eec in PackageKitBackend::<lambda()>::operator() (__closure=0x29b29d0) at /workspace/build/libdiscover/backends/PackageKitBackend/PackageKitBackend.cpp:417
#10 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, PackageKitBackend::search(const AbstractResourcesBackend::Filters&)::<lambda()> >::call (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:501
#11 QtPrivate::Functor<PackageKitBackend::search(const AbstractResourcesBackend::Filters&)::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:558
#12 QtPrivate::QFunctorSlotObject<PackageKitBackend::search(const AbstractResourcesBackend::Filters&)::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=0x29b29c0, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobject_impl.h:198
#13 0x00007f6ba9e421f6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f6b4c5d15ff in PackageKit::Transaction::finished(PackageKit::Transaction::Exit, unsigned int) () from /usr/lib/x86_64-linux-gnu/libpackagekitqt5.so.0
#15 0x00007f6b4c5d689d in PackageKit::TransactionPrivate::finished(unsigned int, unsigned int) () from /usr/lib/x86_64-linux-gnu/libpackagekitqt5.so.0
#16 0x00007f6b4c5d6b70 in PackageKit::TransactionPrivate::daemonQuit() () from /usr/lib/x86_64-linux-gnu/libpackagekitqt5.so.0
#17 0x00007f6b4c5d3da9 in ?? () from /usr/lib/x86_64-linux-gnu/libpackagekitqt5.so.0
#18 0x00007f6ba9e41e89 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f6b4c5cf85e in PackageKit::DaemonPrivate::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/x86_64-linux-gnu/libpackagekitqt5.so.0
#20 0x00007f6b4c5c99d8 in ?? () from /usr/lib/x86_64-linux-gnu/libpackagekitqt5.so.0
#21 0x00007f6ba9e41e89 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f6bad0b20df in QDBusServiceWatcher::serviceOwnerChanged(QString const&, QString const&, QString const&) () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#23 0x00007f6bad0b218f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#24 0x00007f6bad0b270f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#25 0x00007f6bad0b2ae0 in QDBusServiceWatcher::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#26 0x00007f6bad065923 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#27 0x00007f6ba9e42d99 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f6baad7becc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007f6baad838c6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007f6ba9e170c8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f6ba9e1978b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f6ba9e6a333 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007f6ba461e197 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007f6ba461e3f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007f6ba461e49c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007f6ba9e6a73f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007f6ba9e150ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007f6ba9e1d6cc in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x000000000040d781 in main (argc=1, argv=<optimized out>) at /workspace/build/discover/main.cpp:141

Reported using DrKonqi
Comment 1 Ivan Stanton 2017-03-13 15:19:04 UTC 
I confirm. Whenever I search a general term (like ¨app¨) it crashes
Comment 2 Aleix Pol 2017-03-14 12:27:21 UTC 
Git commit cb2f989331684e80369991e753b756e070bc1337 by Aleix Pol.
Committed on 14/03/2017 at 12:27.
Pushed by apol into branch 'Plasma/5.9'.

Make sure we don't call cleaned up streams

M  +1    -1    libdiscover/backends/PackageKitBackend/PackageKitBackend.cpp

https://commits.kde.org/discover/cb2f989331684e80369991e753b756e070bc1337
Comment 3 Ivan Stanton 2017-03-16 13:43:00 UTC 
Glad to see this getting fixed. A fix would be enough to make Discover my daily package manager, over muon
Comment 4 Ivan Stanton 2017-03-19 20:16:12 UTC 
Can confirm it works mostly
Comment 5 Dan Leinir Turthra Jensen 2017-04-19 09:56:33 UTC 
*** Bug 377466 has been marked as a duplicate of this bug. ***
Comment 6 abin 2017-06-20 16:51:05 UTC 
I confirm. Whenever I search a general term (like ¨app¨) it crashes