Bug 420804

Summary: Crash in Category::blacklistPluginsInVector() when starting Discover on system update notification
Product: [Applications] Discover Reporter: Kevin Weller <klweller>
Component: discoverAssignee: Dan Leinir Turthra Jensen <leinir>
Status: RESOLVED DUPLICATE    
Severity: crash CC: aleixpol, nate
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.12.8   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Kevin Weller 2020-04-30 13:19:16 UTC 
Application: plasma-discover (5.12.8)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-99-generic x86_64
Distribution: Ubuntu 18.04.4 LTS

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

Click on Updates icon in task bar to start Discover and update system packages.

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Illegal instruction
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fb3bd7b9800 (LWP 5259))]

Thread 11 (Thread 0x7fb374cf7700 (LWP 5298)):
#0  0x00007fb3b56b49f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55da5d3b6fa0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fb3b56b49f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55da5d3b6f50, cond=0x55da5d3b6f78) at pthread_cond_wait.c:502
#2  0x00007fb3b56b49f3 in __pthread_cond_wait (cond=0x55da5d3b6f78, mutex=0x55da5d3b6f50) at pthread_cond_wait.c:655
#3  0x00007fb3b94a15ab in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fb3bc8fa6a8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fb3bc8fab0a in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007fb3b94a017d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fb3b56ae6db in start_thread (arg=0x7fb374cf7700) at pthread_create.c:463
#8  0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fb3754f8700 (LWP 5297)):
#0  0x00007fb3b8d8ebf9 in __GI___poll (fds=0x7fb368015fc0, nfds=1, timeout=96802) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb3b357f5c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb3b357f6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb3b96d78ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fb3b967c90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb3b949b23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fb3b94a017d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fb3b56ae6db in start_thread (arg=0x7fb3754f8700) at pthread_create.c:463
#8  0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fb37610f700 (LWP 5269)):
#0  0x00007fb3b8d8a0b4 in __GI___libc_read (fd=37, buf=0x7fb37610ecd0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fb3b35c42b0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb3b357f0b7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb3b357f570 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb3b357f962 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb377d30276 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#6  0x00007fb3b35a7175 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fb3b56ae6db in start_thread (arg=0x7fb37610f700) at pthread_create.c:463
#8  0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fb376910700 (LWP 5268)):
#0  0x00007fb3b8d8ebf9 in __GI___poll (fds=0x55da5c546210, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb3b357f5c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb3b357f6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb3b357f721 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb3b35a7175 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb3b56ae6db in start_thread (arg=0x7fb376910700) at pthread_create.c:463
#6  0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fb386c21700 (LWP 5265)):
#0  0x00007fb3b35c5629 in g_mutex_lock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fb3b357f58e in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb3b357f6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb3b96d78ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fb3b967c90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb3b949b23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fb3b94a017d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fb3b56ae6db in start_thread (arg=0x7fb386c21700) at pthread_create.c:463
#8  0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fb387fff700 (LWP 5264)):
#0  0x00007fb3b8d8a0b4 in __GI___libc_read (fd=25, buf=0x7fb387ffeb90, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fb3b35c42b0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb3b357f0b7 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb3b357f570 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb3b357f6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb3b96d78ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fb3b967c90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fb3b949b23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fb3b94a017d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fb3b56ae6db in start_thread (arg=0x7fb387fff700) at pthread_create.c:463
#10 0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fb38daa9700 (LWP 5263)):
#0  0x00007fff3fbfc979 in  ()
#1  0x00007fff3fbfcc30 in clock_gettime ()
#2  0x00007fb3b8daaea6 in __GI___clock_gettime (clock_id=1, tp=0x7fb38daa8aa0) at ../sysdeps/unix/clock_gettime.c:115
#3  0x00007fb3b96d71c1 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fb3b96d59f9 in QTimerInfoList::updateCurrentTime() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb3b96d5fd5 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fb3b96d761e in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fb3b357eb28 in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007fb3b357f4fb in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007fb3b357f6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007fb3b96d78ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fb3b967c90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fb3b949b23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fb3bc87b2a6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007fb3b94a017d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007fb3b56ae6db in start_thread (arg=0x7fb38daa9700) at pthread_create.c:463
#16 0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fb39cc78700 (LWP 5262)):
#0  0x00007fb3b8d8ebf9 in __GI___poll (fds=0x7fb390004a00, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb3b357f5c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb3b357f6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb3b96d78ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fb3b967c90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb3b949b23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fb3ba0b16f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fb3b94a017d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fb3b56ae6db in start_thread (arg=0x7fb39cc78700) at pthread_create.c:463
#9  0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fb39de89700 (LWP 5261)):
#0  0x00007fb3b8d8ebf9 in __GI___poll (fds=0x7fb398018fe0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb3b357f5c9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb3b357f6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb3b96d78ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fb3b967c90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb3b949b23a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fb3ba88cd45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fb3b94a017d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fb3b56ae6db in start_thread (arg=0x7fb39de89700) at pthread_create.c:463
#9  0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fb3ab559700 (LWP 5260)):
#0  0x00007fb3b8d8ebf9 in __GI___poll (fds=0x7fb3ab558ca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb3b3316747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fb3b331836a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fb3ae3065e9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fb3b94a017d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb3b56ae6db in start_thread (arg=0x7fb3ab559700) at pthread_create.c:463
#6  0x00007fb3b8d9b88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fb3bd7b9800 (LWP 5259)):
[KCrash Handler]
#6  0x00007fb3b976c5e0 in QArrayData::shared_null () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fb3bc4fe883 in Category::blacklistPluginsInVector(QSet<QString> const&, QVector<Category*>&) () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#8  0x00007fb3bc4fe75d in Category::blacklistPlugins(QSet<QString> const&) () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#9  0x00007fb3bc4fe8ca in Category::blacklistPluginsInVector(QSet<QString> const&, QVector<Category*>&) () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#10 0x00007fb3bc501f21 in CategoryModel::blacklistPlugin(QString const&) () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#11 0x00007fb3bc5116a4 in ResourcesModel::callerFetchingChanged() () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#12 0x00007fb3b96ad66f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fb38c919a43 in KNSBackend::setFetching(bool) () at /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/kns-backend.so
#14 0x00007fb38c919bee in KNSBackend::markInvalid(QString const&) () at /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/kns-backend.so
#15 0x00007fb38c919fbe in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/kns-backend.so
#16 0x00007fb3b96ad66f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fb38c6bfc75 in KNSCore::Engine::signalError(QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5NewStuffCore.so.5
#18 0x00007fb3b96ad66f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007fb38c6c04b5 in KNSCore::Provider::signalError(QString const&) const () at /usr/lib/x86_64-linux-gnu/libKF5NewStuffCore.so.5
#20 0x00007fb38c6b6696 in  () at /usr/lib/x86_64-linux-gnu/libKF5NewStuffCore.so.5
#21 0x00007fb3b96ad66f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fb3b7e2583f in Attica::BaseJob::finished(Attica::BaseJob*) () at /usr/lib/x86_64-linux-gnu/libKF5Attica.so.5
#23 0x00007fb3b7dd9d5b in Attica::BaseJob::dataFinished() () at /usr/lib/x86_64-linux-gnu/libKF5Attica.so.5
#24 0x00007fb3b7e25afa in  () at /usr/lib/x86_64-linux-gnu/libKF5Attica.so.5
#25 0x00007fb3b96ad555 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007fb3b6c8075f in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#27 0x00007fb3b6d10d49 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#28 0x00007fb3b96ae0c2 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007fb3bb95283c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007fb3bb95a104 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007fb3b967e8d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007fb3b968104d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007fb3b96d8263 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007fb3b357f417 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007fb3b357f650 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007fb3b357f6dc in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007fb3b96d788f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007fb3b967c90a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#39 0x00007fb3b96859b4 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x000055da59b00148 in  ()
#41 0x00007fb3b8c9bb97 in __libc_start_main (main=0x55da59aff870, argc=1, argv=0x7fff3fbba748, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff3fbba738) at ../csu/libc-start.c:310
#42 0x000055da59b003ca in _start ()

Reported using DrKonqi
Comment 1 Nate Graham 2020-05-01 14:18:34 UTC 
Please upgrade to Kubuntu 20.04, which is an LTS release like 18.04 and ships a much newer version of Discover that is less crashy. Thanks!

*** This bug has been marked as a duplicate of bug 401435 ***
Comment 2 Kevin Weller 2020-05-03 05:14:48 UTC 
(In reply to Nate Graham from comment #1)
> Please upgrade to Kubuntu 20.04, which is an LTS release like 18.04 and
> ships a much newer version of Discover that is less crashy. Thanks!
> 
> *** This bug has been marked as a duplicate of bug 401435 ***

After some googling, there doesn't appear to be ab upgrade path from Kubuntu 18.04 LTS to 20.04 LTS yet, not until this Summer at least?  But I do have other tools beasides Discover for OS updates.