Bug 399880

Summary: Discover crashes when quickly going in and out of the main categories
Product: [Applications] Discover Reporter: Mayeul C. <oss+kde+bugzilla>
Component: discoverAssignee: Aleix Pol <aleixpol>
Status: RESOLVED FIXED    
Severity: crash Keywords: drkonqi
Priority: NOR    
Version First Reported In: 5.14.0   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Mayeul C. 2018-10-16 15:58:26 UTC 
Application: plasma-discover (5.14.0)

Qt Version: 5.11.2
Frameworks Version: 5.50.0
Operating System: Linux 4.18.12-arch1-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
Quickly moving around the categories to check them out.

I can reproduce by rapidly clicking the top category, back, and the category again, etc.

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f63c55de800 (LWP 15624))]

Thread 16 (Thread 0x7f637b7fe700 (LWP 15646)):
#0  0x00007f63ca45a40d in syscall () at /usr/lib/libc.so.6
#1  0x00007f63c8c47f61 in g_cond_wait_until () at /usr/lib/libglib-2.0.so.0
#2  0x00007f63c8cc5cb3 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f63c8cc5eb3 in g_async_queue_timeout_pop () at /usr/lib/libglib-2.0.so.0
#4  0x00007f63c8c69c7a in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007f63c8c623eb in  () at /usr/lib/libglib-2.0.so.0
#6  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7f638effd700 (LWP 15640)):
#0  0x00007f63c9722ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f63ca77d5fd in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f63ca775024 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7f63a0ff9700 (LWP 15638)):
#0  0x00007f63c9722ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f63ca77d5fd in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f63ca775024 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7f638ffff700 (LWP 15637)):
#0  0x00007f63ca454bb1 in poll () at /usr/lib/libc.so.6
#1  0x00007f63c8c98ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f63c8c98fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f63c8c99022 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f63c8c623eb in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7f63a1ffb700 (LWP 15636)):
#0  0x00007f63c9722ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f63ca77d5fd in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f63ca775024 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f63a27fc700 (LWP 15634)):
#0  0x00007f63ca454bb1 in poll () at /usr/lib/libc.so.6
#1  0x00007f63c8c98ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f63c8c98fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f63ca97dfe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f63ca9298cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f63ca772eb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f63a2ffd700 (LWP 15633)):
#0  0x00007f63c9722ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f63ca77d5fd in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f63ca775024 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f63a37fe700 (LWP 15632)):
#0  0x00007f63ca454bb1 in poll () at /usr/lib/libc.so.6
#1  0x00007f63c8c98ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f63c8c98fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f63ca97dfe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f63ca9298cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f63ca772eb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f63a3fff700 (LWP 15631)):
#0  0x00007f63c9722ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f63ca77d5fd in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#2  0x00007f63ca775024 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f63acde1700 (LWP 15630)):
#0  0x00007f63ca454bb1 in poll () at /usr/lib/libc.so.6
#1  0x00007f63c8c98ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f63c8c98fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f63ca97dfe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f63ca9298cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f63ca772eb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f63affff700 (LWP 15629)):
#0  0x00007f63ca450734 in read () at /usr/lib/libc.so.6
#1  0x00007f63c8c47781 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f63c8c97a50 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f63c8c98e86 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f63c8c98fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f63ca97dfe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f63ca9298cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f63ca772eb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f63cc1995bb in  () at /usr/lib/libQt5Quick.so.5
#9  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f63b97f0700 (LWP 15628)):
#0  0x00007f63c9722afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f63b9e0817c in  () at /usr/lib/dri/i965_dri.so
#2  0x00007f63b9e07eb8 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f63bbfff700 (LWP 15627)):
#0  0x00007f63ca450734 in read () at /usr/lib/libc.so.6
#1  0x00007f63c8c47781 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f63c8c97a50 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f63c8c98e86 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f63c8c98fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f63ca97dfe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f63ca9298cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f63ca772eb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f63caf07859 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f63c169f700 (LWP 15626)):
#0  0x00007f63ca454bb1 in poll () at /usr/lib/libc.so.6
#1  0x00007f63c8c98ee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f63c8c98fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f63ca97dfe4 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f63ca9298cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f63ca772eb9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f63cbc62ba6 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f63c3be4700 (LWP 15625)):
#0  0x00007f63ca454bb1 in poll () at /usr/lib/libc.so.6
#1  0x00007f63c8c0e630 in  () at /usr/lib/libxcb.so.1
#2  0x00007f63c8c102db in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007f63c5183c5a in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007f63ca77cf65 in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f63c971ca9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f63ca45fa43 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f63c55de800 (LWP 15624)):
[KCrash Handler]
#6  0x00007f63ca95701a in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f63ca957538 in QObject::disconnectImpl(QObject const*, void**, QObject const*, void**, QMetaObject const*) () at /usr/lib/libQt5Core.so.5
#8  0x00007f63c2c5426d in QQuickMenuPrivate::setParentMenu(QQuickMenu*) () at /usr/lib/libQt5QuickTemplates2.so.5
#9  0x00007f63c2c55a32 in QQuickMenuPrivate::removeItem(int, QQuickItem*) () at /usr/lib/libQt5QuickTemplates2.so.5
#10 0x00007f63cc25d347 in QQuickItemPrivate::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&) () at /usr/lib/libQt5Quick.so.5
#11 0x00007f63cc2630d6 in QQuickItem::setParentItem(QQuickItem*) () at /usr/lib/libQt5Quick.so.5
#12 0x00007f63cc2644cd in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#13 0x00007f63cc2647ba in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#14 0x00007f63ca9529bb in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#15 0x00007f63ca95b955 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#16 0x00007f63cc26459c in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#17 0x00007f63cc2835a7 in  () at /usr/lib/libQt5Quick.so.5
#18 0x00007f63ca9529bb in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#19 0x00007f63ca95b955 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#20 0x00007f63babfa94f in  () at /usr/lib/qt/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#21 0x00007f63ca9529bb in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#22 0x00007f63ca95b955 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#23 0x00007f63cc26459c in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#24 0x00007f63cc2837f7 in  () at /usr/lib/libQt5Quick.so.5
#25 0x00007f63ca9529bb in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#26 0x00007f63ca95b955 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#27 0x00007f63cc26459c in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#28 0x00007f63cc282e07 in  () at /usr/lib/libQt5Quick.so.5
#29 0x00007f63ca955371 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#30 0x00007f63cc261c4c in QQuickItem::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#31 0x00007f63cb740e14 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#32 0x00007f63cb7486e1 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#33 0x00007f63ca92ac39 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#34 0x00007f63ca92dccc in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#35 0x00007f63ca97e9d4 in  () at /usr/lib/libQt5Core.so.5
#36 0x00007f63c8c973cf in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#37 0x00007f63c8c98f89 in  () at /usr/lib/libglib-2.0.so.0
#38 0x00007f63c8c98fce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#39 0x00007f63ca97dfc9 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#40 0x00007f63c5219e12 in  () at /usr/lib/libQt5XcbQpa.so.5
#41 0x00007f63ca9298cc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#42 0x00007f63ca931bc6 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#43 0x000056270aecf616 in  ()
#44 0x00007f63ca388223 in __libc_start_main () at /usr/lib/libc.so.6
#45 0x000056270aecfbde in _start ()
[Inferior 1 (process 15624) detached]

Reported using DrKonqi
Comment 1 Aleix Pol 2018-10-16 22:22:04 UTC 
This is fixed in kirigami 5.51.