Bug 381974

Summary: Start menu crashed
Product: [Plasma] plasmashell Reporter: davidva <davidjeremias82>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DUPLICATE    
Severity: crash CC: hein, jpalecek, plasma-bugs, zbygniukas
Priority: NOR Keywords: drkonqi
Version: 5.10.1   
Target Milestone: 1.0   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description davidva 2017-07-04 03:39:05 UTC 
Application: plasmashell (5.10.1)

Qt Version: 5.7.1
Frameworks Version: 5.35.0
Operating System: Linux 4.11.7-300.fc26.x86_64 x86_64
Distribution: "Fedora release 26 (Twenty Six)"

-- Information about the crash:
- What I was doing when the application crashed:
When I Minimize various windows

- Unusual behavior I noticed:
Restarted the start menu, but very strange

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f5c525614c0 (LWP 4626))]

Thread 17 (Thread 0x7f5b3b7fe700 (LWP 5610)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c5f0e193b in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007f5ba4b08985 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007f5ba4b0c8f8 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007f5ba4b0a83b in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 16 (Thread 0x7f5b3bfff700 (LWP 5609)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c5f0e193b in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007f5ba4b08985 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007f5ba4b0c8f8 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007f5ba4b0a83b in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 15 (Thread 0x7f5b48be8700 (LWP 5608)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c5f0e193b in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007f5ba4b08985 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007f5ba4b0c8f8 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007f5ba4b0a83b in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7f5b493e9700 (LWP 5607)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c5f0e193b in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007f5ba4b08985 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007f5ba4b0c8f8 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#9  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#10 0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#11 0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#12 0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#13 0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#14 0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#15 0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#16 0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#17 0x00007f5ba4b0a83b in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#18 0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#19 0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#20 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 13 (Thread 0x7f5b49bea700 (LWP 5606)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c5f0e193b in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007f5ba4b08985 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007f5ba4b0c8f8 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#9  0x00007f5ba4b0a83b in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#10 0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#11 0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#12 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7f5b64f01700 (LWP 5605)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c5f0e193b in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007f5ba4b08985 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007f5ba4b0c8f8 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007f5ba4b0a83b in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7f5b65702700 (LWP 5604)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c5f0e193b in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007f5ba4b08985 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007f5ba4b0c8f8 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007f5ba4b0a83b in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7f5b4a7fc700 (LWP 5603)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c5f0e193b in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007f5ba4b08985 in ThreadWeaver::Weaver::takeFirstAvailableJobOrSuspendOrWait(ThreadWeaver::Thread*, bool, bool, bool) () from /lib64/libKF5ThreadWeaver.so.5
#3  0x00007f5ba4b0c8f8 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#4  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#5  0x00007f5ba4b0c952 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#6  0x00007f5ba4b07b4d in ThreadWeaver::Weaver::applyForWork(ThreadWeaver::Thread*, bool) () from /lib64/libKF5ThreadWeaver.so.5
#7  0x00007f5ba4b0a83b in ThreadWeaver::Thread::run() () from /lib64/libKF5ThreadWeaver.so.5
#8  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7f5b4b7fe700 (LWP 5599)):
#0  0x00007f5c5d806d93 in pthread_mutex_lock () from /lib64/libpthread.so.0
#1  0x00007f5c53fb61ee in pa_mutex_lock () from /usr/lib64/pulseaudio/libpulsecommon-10.0.so
#2  0x00007f5c5441eb7b in poll_func () from /lib64/libpulse.so.0
#3  0x00007f5c54410530 in pa_mainloop_poll () from /lib64/libpulse.so.0
#4  0x00007f5c54410bc0 in pa_mainloop_iterate () from /lib64/libpulse.so.0
#5  0x00007f5c54410c50 in pa_mainloop_run () from /lib64/libpulse.so.0
#6  0x00007f5c5441eab9 in thread () from /lib64/libpulse.so.0
#7  0x00007f5c53fb7078 in internal_thread_func () from /usr/lib64/pulseaudio/libpulsecommon-10.0.so
#8  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#9  0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7f5b9661c700 (LWP 5182)):
#0  0x00007f5c5e4bcaad in poll () from /lib64/libc.so.6
#1  0x00007f5c57211569 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007f5c5721167c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f5c5f2d7d0b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f5c5f287b8a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f5c5f0dcefa in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f5b98f82497 in KCupsConnection::run() () from /lib64/libkcupslib.so
#7  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#9  0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7f5ba7be3700 (LWP 5092)):
#0  0x00007f5c5f2d63a1 in QTimerInfoList::updateCurrentTime() () from /lib64/libQt5Core.so.5
#1  0x00007f5c5f2d67b5 in QTimerInfoList::timerWait(timespec&) () from /lib64/libQt5Core.so.5
#2  0x00007f5c5f2d79ac in timerSourcePrepareHelper(GTimerSource*, int*) () from /lib64/libQt5Core.so.5
#3  0x00007f5c5f2d7a4e in timerSourcePrepare(_GSource*, int*) () from /lib64/libQt5Core.so.5
#4  0x00007f5c57210ac9 in g_main_context_prepare () from /lib64/libglib-2.0.so.0
#5  0x00007f5c5721149b in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#6  0x00007f5c5721167c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#7  0x00007f5c5f2d7d0b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#8  0x00007f5c5f287b8a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5f0dcefa in QThread::exec() () from /lib64/libQt5Core.so.5
#10 0x00007f5c62ce9ff6 in QQuickPixmapReader::run() () from /lib64/libQt5Quick.so.5
#11 0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#12 0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#13 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7f5c357ec700 (LWP 4965)):
#0  0x00007f5c5d80a81b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f5c64dbc534 in QTWTF::TCMalloc_PageHeap::scavengerThread() () from /lib64/libQt5Script.so.5
#2  0x00007f5c64dbc579 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /lib64/libQt5Script.so.5
#3  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#4  0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f5c375c6700 (LWP 4937)):
#0  0x00007f5c65341043 in _dl_update_slotinfo () from /lib64/ld-linux-x86-64.so.2
#1  0x00007f5c6534130c in update_get_addr () from /lib64/ld-linux-x86-64.so.2
#2  0x00007f5c5f0e0186 in QThreadData::current(bool) () from /lib64/libQt5Core.so.5
#3  0x00007f5c5f2d7bba in postEventSourcePrepare(_GSource*, int*) () from /lib64/libQt5Core.so.5
#4  0x00007f5c57210ac9 in g_main_context_prepare () from /lib64/libglib-2.0.so.0
#5  0x00007f5c5721149b in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#6  0x00007f5c5721167c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#7  0x00007f5c5f2d7d0b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#8  0x00007f5c5f287b8a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5f0dcefa in QThread::exec() () from /lib64/libQt5Core.so.5
#10 0x00007f5c623629b5 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#11 0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#12 0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#13 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f5c44fe8700 (LWP 4876)):
#0  0x00007f5c5e4bcaad in poll () from /lib64/libc.so.6
#1  0x00007f5c57211569 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007f5c5721167c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f5c5f2d7d0b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f5c5f287b8a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f5c5f0dcefa in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f5c623629b5 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#9  0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f5c46a2e700 (LWP 4679)):
#0  0x00007f5c5f2d7a5e in timerSourcePrepare(_GSource*, int*) () from /lib64/libQt5Core.so.5
#1  0x00007f5c57210ac9 in g_main_context_prepare () from /lib64/libglib-2.0.so.0
#2  0x00007f5c5721149b in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#3  0x00007f5c5721167c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00007f5c5f2d7d0b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f5c5f287b8a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007f5c5f0dcefa in QThread::exec() () from /lib64/libQt5Core.so.5
#7  0x00007f5c5f4e2709 in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#8  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f5c48268700 (LWP 4638)):
#0  0x00007f5c5e4bcaad in poll () from /lib64/libc.so.6
#1  0x00007f5c636b8c97 in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007f5c636baa8a in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007f5c4b8c1b99 in QXcbEventReader::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007f5c5f0e11ee in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007f5c5d80436d in start_thread () from /lib64/libpthread.so.0
#6  0x00007f5c5e4c8b9f in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f5c525614c0 (LWP 4626)):
[KCrash Handler]
#6  0x00007f5c5f2550cb in QSortFilterProxyModelPrivate::updateChildrenMapping(QModelIndex const&, QSortFilterProxyModelPrivate::Mapping*, Qt::Orientation, int, int, int, bool) () from /lib64/libQt5Core.so.5
#7  0x00007f5c5f25554e in QSortFilterProxyModelPrivate::source_items_removed(QModelIndex const&, int, int, Qt::Orientation) [clone .part.94] () from /lib64/libQt5Core.so.5
#8  0x00007f5c5f25ae79 in QSortFilterProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Core.so.5
#9  0x00007f5c5f2b0383 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#10 0x00007f5c5f31e574 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#11 0x00007f5c5f23856b in QAbstractItemModel::endRemoveRows() () from /lib64/libQt5Core.so.5
#12 0x00007f5ba4241426 in TaskManager::TaskGroupingProxyModel::Private::sourceRowsAboutToBeRemoved(QModelIndex const&, int, int) () from /lib64/libtaskmanager.so.6
#13 0x00007f5ba42441b9 in TaskManager::TaskGroupingProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libtaskmanager.so.6
#14 0x00007f5c5f2b0383 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#15 0x00007f5c5f31e504 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#16 0x00007f5c5f237e4b in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#17 0x00007f5c5f253dc5 in QSortFilterProxyModelPrivate::remove_proxy_interval(QVector<int>&, QVector<int>&, int, int, QModelIndex const&, Qt::Orientation, bool) () from /lib64/libQt5Core.so.5
#18 0x00007f5c5f258977 in QSortFilterProxyModelPrivate::remove_source_items(QVector<int>&, QVector<int>&, QVector<int> const&, QModelIndex const&, Qt::Orientation, bool) () from /lib64/libQt5Core.so.5
#19 0x00007f5c5f258bb3 in QSortFilterProxyModelPrivate::source_items_about_to_be_removed(QModelIndex const&, int, int, Qt::Orientation) () from /lib64/libQt5Core.so.5
#20 0x00007f5c5f25ae58 in QSortFilterProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Core.so.5
#21 0x00007f5c5f2b0383 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#22 0x00007f5c5f31e504 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#23 0x00007f5c5f237e4b in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#24 0x00007f5ba5f254ef in KConcatenateRowsProxyModelPrivate::slotRowsAboutToBeRemoved(QModelIndex const&, int, int) () from /lib64/libKF5ItemModels.so.5
#25 0x00007f5ba5f25ea1 in KConcatenateRowsProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libKF5ItemModels.so.5
#26 0x00007f5c5f2b0383 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#27 0x00007f5c5f31e504 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#28 0x00007f5c5f237e4b in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#29 0x00007f5c5f24f987 in QIdentityProxyModelPrivate::_q_sourceRowsAboutToBeRemoved(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#30 0x00007f5c5f250429 in QIdentityProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Core.so.5
#31 0x00007f5c5f2b0383 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#32 0x00007f5c5f31e504 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) () from /lib64/libQt5Core.so.5
#33 0x00007f5c5f237e4b in QAbstractItemModel::beginRemoveRows(QModelIndex const&, int, int) () from /lib64/libQt5Core.so.5
#34 0x00007f5ba425c21e in TaskManager::XWindowTasksModel::Private::removeWindow(unsigned long long) () from /lib64/libtaskmanager.so.6
#35 0x00007f5c5f2b04b7 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#36 0x00007f5c61b076f2 in KWindowSystem::windowRemoved(unsigned long long) () from /lib64/libKF5WindowSystem.so.5
#37 0x00007f5c454077f9 in NETEventFilter::removeClient(unsigned int) () from /usr/lib64/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#38 0x00007f5c61afff2c in NETRootInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) () from /lib64/libKF5WindowSystem.so.5
#39 0x00007f5c61b00c62 in NETRootInfo::event(xcb_generic_event_t*, QFlags<NET::Property>*, QFlags<NET::Property2>*) () from /lib64/libKF5WindowSystem.so.5
#40 0x00007f5c61b00fc5 in NETRootInfo::event(xcb_generic_event_t*, unsigned long*, int) () from /lib64/libKF5WindowSystem.so.5
#41 0x00007f5c45406f3d in NETEventFilter::nativeEventFilter(xcb_generic_event_t*) () from /usr/lib64/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#42 0x00007f5c5f286be4 in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () from /lib64/libQt5Core.so.5
#43 0x00007f5c4b8c3210 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /lib64/libQt5XcbQpa.so.5
#44 0x00007f5c4b8c3ea2 in QXcbConnection::processXcbEvents() () from /lib64/libQt5XcbQpa.so.5
#45 0x00007f5c5f2b1199 in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#46 0x00007f5c5fb6ed9c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#47 0x00007f5c5fb763d4 in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#48 0x00007f5c5f288b8b in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#49 0x00007f5c5f28ad6b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt5Core.so.5
#50 0x00007f5c5f2d7c73 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#51 0x00007f5c57211247 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#52 0x00007f5c572115e8 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#53 0x00007f5c5721167c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#54 0x00007f5c5f2d7cef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#55 0x00007f5c5f287b8a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#56 0x00007f5c5f28f7dc in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#57 0x000055d729e563b2 in main ()

Possible duplicates by query: bug 381800, bug 381771, bug 381454, bug 381006, bug 380918.

Reported using DrKonqi
Comment 1 Marco Martin 2017-07-05 14:20:09 UTC 
*** Bug 381006 has been marked as a duplicate of this bug. ***
Comment 2 David Edmundson 2017-07-13 19:01:16 UTC 

*** This bug has been marked as a duplicate of bug 342763 ***
Comment 3 Jiri Palecek 2017-07-13 21:49:26 UTC 
Hello

I tried to get to the bottom of this crash, because I encountered it several times (about once a week-once a month). My system is Debian sid, Plasma 5.8.7 and Qt 5.7.1. The backtrace I got was:

Thread 1 (Thread 0xafa61200 (LWP 2190)):
#0  0xb77d8cf9 in __kernel_vsyscall ()
#1  0xb4d412fa in nanosleep () at ../sysdeps/unix/syscall-template.S:84
#2  0xb4d41225 in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55
#3  0xb77a1c3a in ?? () from /usr/lib/i386-linux-gnu/libKF5Crash.so.5
#4  0xb77a23e0 in ?? () from /usr/lib/i386-linux-gnu/libKF5Crash.so.5
#5  0xb77a2860 in KCrash::defaultCrashHandler(int) () from /usr/lib/i386-linux-gnu/libKF5Crash.so.5
#6  <signal handler called>
#7  QSortFilterProxyModelPrivate::updateChildrenMapping (this=this@entry=0x80c51650, source_parent=..., parent_mapping=parent_mapping@entry=0x81a6f338, start=<optimized out>, end=<optimized out>, delta_item_count=<optimized out>, remove=true, orient=Qt::Vertical)
    at itemmodels/qsortfilterproxymodel.cpp:975
#8  0xb51ecd3f in QSortFilterProxyModelPrivate::source_items_removed (orient=Qt::Vertical, end=<optimized out>, start=0, source_parent=..., this=0x80c51650) at itemmodels/qsortfilterproxymodel.cpp:917
---Type <return> to continue, or q <return> to quit---
#9  QSortFilterProxyModelPrivate::_q_sourceRowsRemoved (this=0x80c51650, source_parent=..., start=0, end=<optimized out>) at itemmodels/qsortfilterproxymodel.cpp:1424
#10 0xb51f4b8d in QSortFilterProxyModel::qt_static_metacall (_o=0x80c4af78, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbfc79d1c) at .moc/moc_qsortfilterproxymodel.cpp:211
#11 0xb5257fdb in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#12 0xb525885d in QMetaObject::activate (sender=0x80c5c490, m=0xb54a1fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=12, argv=0xbfc79d1c) at kernel/qobject.cpp:3602
#13 0xb52d6821 in QAbstractItemModel::rowsRemoved (this=0x80c5c490, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:615
#14 0xb51cc349 in QAbstractItemModel::endRemoveRows (this=0x80c5c490) at itemmodels/qabstractitemmodel.cpp:2715
#15 0xa42f76f2 in TaskManager::TaskGroupingProxyModel::Private::sourceRowsAboutToBeRemoved (this=0x80c31898, parent=..., first=7, last=7) at ./libtaskmanager/taskgroupingproxymodel.cpp:197
#16 0xa42fafed in TaskManager::TaskGroupingProxyModel::qt_static_metacall (_o=0x80c5c490, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbfc79f6c) at ./obj-i686-linux-gnu/libtaskmanager/moc_taskgroupingproxymodel.cpp:152
#17 0xb5257fdb in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#18 0xb525885d in QMetaObject::activate (sender=0x80c5c048, m=0xb54a1fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=11, argv=0xbfc79f6c) at kernel/qobject.cpp:3602
#19 0xb52d67b1 in QAbstractItemModel::rowsAboutToBeRemoved (this=0x80c5c048, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:608
#20 0xb51cbc00 in QAbstractItemModel::beginRemoveRows (this=0x80c5c048, parent=..., first=7, last=7) at itemmodels/qabstractitemmodel.cpp:2698
#21 0xb51f24f0 in QSortFilterProxyModelPrivate::remove_proxy_interval (emit_signal=true, orient=Qt::Vertical, proxy_parent=..., proxy_end=7, proxy_start=7, proxy_to_source=..., source_to_proxy=..., this=0x80c94388) at itemmodels/qsortfilterproxymodel.cpp:583
#22 QSortFilterProxyModelPrivate::remove_source_items (this=<optimized out>, source_to_proxy=..., proxy_to_source=..., source_items=..., source_parent=..., orient=Qt::Vertical, emit_signal=true) at itemmodels/qsortfilterproxymodel.cpp:565
#23 0xb51f26cb in QSortFilterProxyModelPrivate::source_items_about_to_be_removed (this=<optimized out>, source_parent=..., start=<optimized out>, end=<optimized out>, orient=<optimized out>) at itemmodels/qsortfilterproxymodel.cpp:866
#24 0xb51f4b6d in QSortFilterProxyModelPrivate::_q_sourceRowsAboutToBeRemoved (end=7, start=<optimized out>, source_parent=..., this=<optimized out>) at itemmodels/qsortfilterproxymodel.cpp:1417
#25 QSortFilterProxyModel::qt_static_metacall (_o=0x80c5c048, _c=QMetaObject::InvokeMetaMethod, _id=13, _a=0xbfc7a23c) at .moc/moc_qsortfilterproxymodel.cpp:210
#26 0xb5257fdb in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#27 0xb525885d in QMetaObject::activate (sender=0x80c5a490, m=0xb54a1fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=11, argv=0xbfc7a23c) at kernel/qobject.cpp:3602
#28 0xb52d67b1 in QAbstractItemModel::rowsAboutToBeRemoved (this=0x80c5a490, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:608
#29 0xb51cbc00 in QAbstractItemModel::beginRemoveRows (this=0x80c5a490, parent=..., first=7, last=7) at itemmodels/qabstractitemmodel.cpp:2698
#30 0xa482d386 in KConcatenateRowsProxyModelPrivate::slotRowsAboutToBeRemoved (this=0x80c5a448, start=7, end=7) at ./src/kconcatenaterowsproxymodel.cpp:241
#31 0xa482e7cd in KConcatenateRowsProxyModel::qt_static_metacall (_o=0x80c5a490, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfc7a45c) at ./obj-i686-linux-gnu/src/moc_kconcatenaterowsproxymodel.cpp:130
#32 0xb5257fdb in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#33 0xb525885d in QMetaObject::activate (sender=0x80c31c80, m=0xb54a1fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=11, argv=0xbfc7a45c) at kernel/qobject.cpp:3602
#34 0xb52d67b1 in QAbstractItemModel::rowsAboutToBeRemoved (this=0x80c31c80, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:608
#35 0xb51cbc00 in QAbstractItemModel::beginRemoveRows (this=0x80c31c80, parent=..., first=7, last=7) at itemmodels/qabstractitemmodel.cpp:2698
#36 0xb51e796e in QIdentityProxyModelPrivate::_q_sourceRowsAboutToBeRemoved (end=<optimized out>, start=<optimized out>, parent=..., this=<optimized out>) at itemmodels/qidentityproxymodel.cpp:580
#37 QIdentityProxyModel::qt_static_metacall (_o=0x80c31c80, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=<optimized out>) at .moc/moc_qidentityproxymodel.cpp:150
#38 0xb5257fdb in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#39 0xb525885d in QMetaObject::activate (sender=0x80b5b198, m=0xb54a1fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=11, argv=0xbfc7a63c) at kernel/qobject.cpp:3602
#40 0xb52d67b1 in QAbstractItemModel::rowsAboutToBeRemoved (this=0x80b5b198, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:608
#41 0xb51cbc00 in QAbstractItemModel::beginRemoveRows (this=0x80b5b198, parent=..., first=7, last=7) at itemmodels/qabstractitemmodel.cpp:2698
#42 0xa43135c3 in TaskManager::XWindowTasksModel::Private::removeWindow (this=0x80bc5590, window=<optimized out>) at ./libtaskmanager/xwindowtasksmodel.cpp:250
#43 0xa4313858 in TaskManager::XWindowTasksModel::Private::<lambda(WId)>::operator() (window=<optimized out>, __closure=0x80af8478) at ./libtaskmanager/xwindowtasksmodel.cpp:160
#44 QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<unsigned int>, void, TaskManager::XWindowTasksModel::Private::init()::<lambda(WId)> >::call (arg=0xbfc7a844, f=...) at /usr/include/i386-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:135
#45 QtPrivate::Functor<TaskManager::XWindowTasksModel::Private::init()::<lambda(WId)>, 1>::call<QtPrivate::List<unsigned int>, void> (arg=0xbfc7a844, f=...) at /usr/include/i386-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:192
#46 QtPrivate::QFunctorSlotObject<TaskManager::XWindowTasksModel::Private::init()::<lambda(WId)>, 1, QtPrivate::List<unsigned int>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=1, this_=0x80af8470, r=0x80b5b198, a=0xbfc7a844, 
    ret=0x0) at /usr/include/i386-linux-gnu/qt5/QtCore/qobject_impl.h:169
#47 0xb525834e in QtPrivate::QSlotObjectBase::call (a=0xbfc7a844, r=0x80b5b198, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101
#48 QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3723
#49 0xb525885d in QMetaObject::activate (sender=0xb6629900, m=0xb6628dc0 <KWindowSystem::staticMetaObject>, local_signal_index=2, argv=0xbfc7a844) at kernel/qobject.cpp:3602
#50 0xb660fd91 in KWindowSystem::windowRemoved(unsigned int) () from /usr/lib/i386-linux-gnu/libKF5WindowSystem.so.5
#51 0xae2393f2 in ?? () from /usr/lib/i386-linux-gnu/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#52 0xb66080b7 in NETRootInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) () from /usr/lib/i386-linux-gnu/libKF5WindowSystem.so.5
#53 0xb6608ffb in NETRootInfo::event(xcb_generic_event_t*, QFlags<NET::Property>*, QFlags<NET::Property2>*) () from /usr/lib/i386-linux-gnu/libKF5WindowSystem.so.5
#54 0xb6609393 in NETRootInfo::event(xcb_generic_event_t*, unsigned long*, int) () from /usr/lib/i386-linux-gnu/libKF5WindowSystem.so.5
#55 0xae238a7f in ?? () from /usr/lib/i386-linux-gnu/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#56 0xb5226860 in QAbstractEventDispatcher::filterNativeEvent (this=<optimized out>, eventType=..., message=<optimized out>, result=<optimized out>) at kernel/qabstracteventdispatcher.cpp:466
#57 0xaf733122 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /usr/lib/i386-linux-gnu/libQt5XcbQpa.so.5
#58 0xaf733ef7 in QXcbConnection::processXcbEvents() () from /usr/lib/i386-linux-gnu/libQt5XcbQpa.so.5
#59 0xaf76ade1 in ?? () from /usr/lib/i386-linux-gnu/libQt5XcbQpa.so.5
#60 0xb52550e0 in QMetaCallEvent::placeMetaCall (this=0x9d4cf7e0, object=0x803684f8) at kernel/qobject.cpp:502
#61 0xb5258e33 in QObject::event (this=0x803684f8, e=0x9d4cf7e0) at kernel/qobject.cpp:1263
#62 0xaf736a49 in QXcbConnection::event(QEvent*) () from /usr/lib/i386-linux-gnu/libQt5XcbQpa.so.5
#63 0xb5ba317a in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/i386-linux-gnu/libQt5Widgets.so.5
#64 0xb5bab03c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/i386-linux-gnu/libQt5Widgets.so.5
#65 0xb5229c5d in QCoreApplication::notifyInternal2 (receiver=0x803684f8, event=0x9d4cf7e0) at kernel/qcoreapplication.cpp:988
#66 0xb522c647 in QCoreApplication::sendEvent (event=0x9d4cf7e0, receiver=<optimized out>) at kernel/qcoreapplication.h:231
#67 QCoreApplicationPrivate::sendPostedEvents (receiver=<optimized out>, event_type=<optimized out>, data=0x803552a8) at kernel/qcoreapplication.cpp:1649
#68 0xb522ca87 in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1503
#69 0xb52830a3 in postEventSourceDispatch (s=0x803907a8) at kernel/qeventdispatcher_glib.cpp:276
#70 0xb3cde4e9 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#71 0xb3cde789 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#72 0xb3cde854 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---frame 7
#73 0xb5283493 in QEventDispatcherGlib::processEvents (this=0x80395a08, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#74 0xaf76bd81 in ?? () from /usr/lib/i386-linux-gnu/libQt5XcbQpa.so.5
#75 0xb522783d in QEventLoop::exec (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:212
#76 0xb523099f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1261
#77 0xb5565aa1 in QGuiApplication::exec() () from /usr/lib/i386-linux-gnu/sse2/libQt5Gui.so.5
#78 0xb5ba30d4 in QApplication::exec() () from /usr/lib/i386-linux-gnu/libQt5Widgets.so.5
#79 0x800b3a4c in ?? ()
#80 0xb4ca8276 in __libc_start_main (main=0x800b2ee0, argc=2, argv=0xbfc7b6f4, init=0x80112890 <__libc_csu_init>, fini=0x801128f0 <__libc_csu_fini>, rtld_fini=0xb77ea080 <_dl_fini>, stack_end=0xbfc7b6ec) at ../csu/libc-start.c:291
#81 0x800b3dc7 in _start ()

I'm quite convinced it is the same crash in these many bugreports, but I can't be sure, because it is nearly unreproducible and the cause is not evident from the bt. However, the immediate cause of my crash is clear:

(gdb) frame 7
#7  QSortFilterProxyModelPrivate::updateChildrenMapping (this=this@entry=0x80c51650, source_parent=..., parent_mapping=parent_mapping@entry=0x81a6f338, start=<optimized out>, end=<optimized out>, delta_item_count=<optimized out>, remove=true, 
...
(gdb) x/32 parent_mapping->mapped_children.d  
0x82b2c9a0:     1       5       15      16
0x82b2c9b0:     0       0       6       -2134522736
0x82b2c9c0:     0       0       6       -2134522736
0x82b2c9d0:     0       0       6       -2134522736
0x82b2c9e0:     1       0       6       -2134522736
0x82b2c9f0:     2       0       6       -2134522736
0x82b2ca00:     3       0       6       -2134522736
0x82b2ca10:     3       0       6       -2134522736

As you can see, the mapping contains 3 same QModelIndexes. Tho code in updateChildrenMapping goes like this:

            // update mapping
            Mapping *cm = source_index_mapping.take(source_child_index);
            Q_ASSERT(cm);
            // we do not reinsert right away, because the new index might be identical with another, old index
            moved_source_index_mappings.append(QPair<QModelIndex, Mapping*>(new_index, cm));

This is executed for all source_child_index-es which are in the mapping (or more precisely, a suffix thereof). When source_index_mapping.take(...) executes several times for the same source_child_index, it can't retrieve a valid Mapping for the second and subsequent times. It would return NULL, and this eventually causes a crash (in a debug build, it would fail the Q_ASSERT; in release builds, it leads to SIGSEGV several lines below).

Now, what does lead to such unfortuante state that parent_mapping->mapped_children contains an index several times? After all, the code in QSortFilterProxyModelPrivate written in such a way that no QModelIndex should be more than once in all of the mapped_children taken together. I placed some asserts over the code and came to a crash that could be closer to the cause:

(gdb) bt                                                                                                                                                                                                                                                                       
#0  0xb77aecf9 in __kernel_vsyscall ()                                                                                                                                                                                                                                         
#1  0xb4c212fa in nanosleep () at ../sysdeps/unix/syscall-template.S:84                                                                                                                                                                                                        
#2  0xb4c21225 in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55                                                                                                                                                                                                           
#3  0xb7774c3a in ?? () from /usr/lib/i386-linux-gnu/libKF5Crash.so.5                                                                                                                                                                                                          
#4  0xb77753e0 in ?? () from /usr/lib/i386-linux-gnu/libKF5Crash.so.5                                                                                                                                                                                                          
#5  0xb7775860 in KCrash::defaultCrashHandler(int) () from /usr/lib/i386-linux-gnu/libKF5Crash.so.5                                                                                                                                                                            
#6  <signal handler called>                                                                                                                                                                                                                                                    
#7  0xb77aecf9 in __kernel_vsyscall ()                                                                                                                                                                                                                                         
#8  0xb4b9bdc0 in __libc_signal_restore_set (set=0xbf9ee900) at ../sysdeps/unix/sysv/linux/nptl-signals.h:79                                                                                                                                                                   
#9  __GI_raise (sig=6) at ../sysdeps/unix/sysv/linux/raise.c:48                                                                                                                                                                                                                
#10 0xb4b9d287 in __GI_abort () at abort.c:89                                                                                                                                                                                                                                  
#11 0xb4f1d0d3 in qt_message_fatal (context=..., message=<synthetic pointer>...) at global/qlogging.cpp:1682                                                                                                                                                                   
#12 QMessageLogger::fatal (this=0xbf9eebb8, msg=0xb51a2188 "ASSERT: \"%s\" in file %s, line %d") at global/qlogging.cpp:793                                                                                                                                                    
#13 0xb4f15d76 in qt_assert (assertion=0xb5253bfc "std::find(parent_mapping->mapped_children.begin(), it2, new_index) == it2", file=0xb5253b20 "itemmodels/qsortfilterproxymodel.cpp", line=1002) at global/qglobal.cpp:3081                                                   
#14 0xb50ad8ae in QSortFilterProxyModelPrivate::updateChildrenMapping (this=<optimized out>, source_parent=..., parent_mapping=<optimized out>, orient=Qt::Vertical, start=<optimized out>, end=<optimized out>, delta_item_count=<optimized out>, remove=true)                
    at itemmodels/qsortfilterproxymodel.cpp:1002                                                                                                                                                                                                                               
#15 0xb50ada08 in QSortFilterProxyModelPrivate::source_items_removed (this=0x818139a0, source_parent=..., start=start@entry=1, end=1, orient=Qt::Vertical) at itemmodels/qsortfilterproxymodel.cpp:960                                                                         
#16 0xb50adcc7 in QSortFilterProxyModelPrivate::source_items_removed (orient=Qt::Vertical, end=1, start=1, source_parent=..., this=<optimized out>) at itemmodels/qsortfilterproxymodel.cpp:1473                                                                               
#17 QSortFilterProxyModelPrivate::_q_sourceRowsRemoved (this=<optimized out>, source_parent=..., start=1, end=1) at itemmodels/qsortfilterproxymodel.cpp:1472                                                                                                                  
#18 0xb50b381d in QSortFilterProxyModel::qt_static_metacall (_o=0x81857db0, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0xbf9eee3c) at .moc/moc_qsortfilterproxymodel.cpp:211                                                                                                 
#19 0xb511b5af in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740                                                                                            
#20 0xb511b96d in QMetaObject::activate (sender=0x818123f0, m=0xb5384fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=12, argv=0xbf9eee3c) at kernel/qobject.cpp:3602                                                                                            
#21 0xb519a051 in QAbstractItemModel::rowsRemoved (this=0x818123f0, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:615                                                                                                                  
#22 0xb508d949 in QAbstractItemModel::endRemoveRows (this=0x818123f0) at itemmodels/qabstractitemmodel.cpp:2715                                                                                                                                                                
#23 0xa708c6f2 in TaskManager::TaskGroupingProxyModel::Private::sourceRowsAboutToBeRemoved (this=0x81805908, parent=..., first=9, last=9) at ./libtaskmanager/taskgroupingproxymodel.cpp:197                                                                                   
#24 0xa708ffed in TaskManager::TaskGroupingProxyModel::qt_static_metacall (_o=0x818123f0, _c=QMetaObject::InvokeMetaMethod, _id=7, _a=0xbf9ef07c) at ./obj-i686-linux-gnu/libtaskmanager/moc_taskgroupingproxymodel.cpp:152
#25 0xb511b5af in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#26 0xb511b96d in QMetaObject::activate (sender=0x81866c00, m=0xb5384fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=11, argv=0xbf9ef07c) at kernel/qobject.cpp:3602
#27 0xb5199fe1 in QAbstractItemModel::rowsAboutToBeRemoved (this=0x81866c00, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:608
#28 0xb508d064 in QAbstractItemModel::beginRemoveRows (this=0x81866c00, parent=..., first=9, last=9) at itemmodels/qabstractitemmodel.cpp:2698
#29 0xb50ac2fc in QSortFilterProxyModelPrivate::remove_proxy_interval (this=0x81858320, source_to_proxy=..., proxy_to_source=..., proxy_start=9, proxy_end=9, proxy_parent=..., orient=Qt::Vertical, emit_signal=true) at itemmodels/qsortfilterproxymodel.cpp:626
#30 0xb50b113c in QSortFilterProxyModelPrivate::remove_source_items (this=<optimized out>, source_to_proxy=..., proxy_to_source=..., source_items=..., source_parent=..., orient=<optimized out>, emit_signal=true) at itemmodels/qsortfilterproxymodel.cpp:607
#31 0xb50b1328 in QSortFilterProxyModelPrivate::source_items_about_to_be_removed (this=<optimized out>, source_parent=..., start=<optimized out>, end=<optimized out>, orient=<optimized out>) at itemmodels/qsortfilterproxymodel.cpp:908
#32 0xb50b37fd in QSortFilterProxyModelPrivate::_q_sourceRowsAboutToBeRemoved (end=9, start=<optimized out>, source_parent=..., this=<optimized out>) at itemmodels/qsortfilterproxymodel.cpp:1464
#33 QSortFilterProxyModel::qt_static_metacall (_o=0x81866c00, _c=QMetaObject::InvokeMetaMethod, _id=13, _a=0xbf9ef37c) at .moc/moc_qsortfilterproxymodel.cpp:210
#34 0xb511b5af in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#35 0xb511b96d in QMetaObject::activate (sender=0x81859478, m=0xb5384fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=11, argv=0xbf9ef37c) at kernel/qobject.cpp:3602
#36 0xb5199fe1 in QAbstractItemModel::rowsAboutToBeRemoved (this=0x81859478, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:608
#37 0xb508d064 in QAbstractItemModel::beginRemoveRows (this=0x81859478, parent=..., first=9, last=9) at itemmodels/qabstractitemmodel.cpp:2698
#38 0xa75c2386 in KConcatenateRowsProxyModelPrivate::slotRowsAboutToBeRemoved (this=0x81859430, start=9, end=9) at ./src/kconcatenaterowsproxymodel.cpp:241
#39 0xa75c37cd in KConcatenateRowsProxyModel::qt_static_metacall (_o=0x81859478, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbf9ef58c) at ./obj-i686-linux-gnu/src/moc_kconcatenaterowsproxymodel.cpp:130
#40 0xb511b5af in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#41 0xb511b96d in QMetaObject::activate (sender=0x81868180, m=0xb5384fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=11, argv=0xbf9ef58c) at kernel/qobject.cpp:3602
#42 0xb5199fe1 in QAbstractItemModel::rowsAboutToBeRemoved (this=0x81868180, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:608
#43 0xb508d064 in QAbstractItemModel::beginRemoveRows (this=0x81868180, parent=..., first=9, last=9) at itemmodels/qabstractitemmodel.cpp:2698
#44 0xb50a7466 in QIdentityProxyModelPrivate::_q_sourceRowsAboutToBeRemoved (this=0x8182c0e0, parent=..., start=9, end=9) at itemmodels/qidentityproxymodel.cpp:580
#45 0xb50a8315 in QIdentityProxyModel::qt_static_metacall (_o=0x81868180, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbf9ef78c) at .moc/moc_qidentityproxymodel.cpp:150
#46 0xb511b5af in QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740
#47 0xb511b96d in QMetaObject::activate (sender=0x817b3cc0, m=0xb5384fd0 <QAbstractItemModel::staticMetaObject>, local_signal_index=11, argv=0xbf9ef78c) at kernel/qobject.cpp:3602
#48 0xb5199fe1 in QAbstractItemModel::rowsAboutToBeRemoved (this=0x817b3cc0, _t1=..., _t2=<optimized out>, _t3=<optimized out>) at .moc/moc_qabstractitemmodel.cpp:608
#49 0xb508d064 in QAbstractItemModel::beginRemoveRows (this=0x817b3cc0, parent=..., first=9, last=9) at itemmodels/qabstractitemmodel.cpp:2698
#50 0xa70a85c3 in TaskManager::XWindowTasksModel::Private::removeWindow (this=0x8176b578, window=<optimized out>) at ./libtaskmanager/xwindowtasksmodel.cpp:250
#51 0xa70a8858 in TaskManager::XWindowTasksModel::Private::<lambda(WId)>::operator() (window=<optimized out>, __closure=0x8162dc20) at ./libtaskmanager/xwindowtasksmodel.cpp:160
#52 QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<unsigned int>, void, TaskManager::XWindowTasksModel::Private::init()::<lambda(WId)> >::call (arg=0xbf9ef984, f=...) at /usr/include/i386-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:135
#53 QtPrivate::Functor<TaskManager::XWindowTasksModel::Private::init()::<lambda(WId)>, 1>::call<QtPrivate::List<unsigned int>, void> (arg=0xbf9ef984, f=...) at /usr/include/i386-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:192
#54 QtPrivate::QFunctorSlotObject<TaskManager::XWindowTasksModel::Private::init()::<lambda(WId)>, 1, QtPrivate::List<unsigned int>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=1, this_=0x8162dc18, r=0x817b3cc0, a=0xbf9ef984, 
    ret=0x0) at /usr/include/i386-linux-gnu/qt5/QtCore/qobject_impl.h:169
#55 0xb511b3f3 in QtPrivate::QSlotObjectBase::call (a=0xbf9ef984, r=0x817b3cc0, this=0x8162dc18) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101
#56 QMetaObject::activate (sender=<optimized out>, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3723
#57 0xb511b96d in QMetaObject::activate (sender=0xb65fc900, m=0xb65fbdc0 <KWindowSystem::staticMetaObject>, local_signal_index=2, argv=0xbf9ef984) at kernel/qobject.cpp:3602
#58 0xb65e2d91 in KWindowSystem::windowRemoved(unsigned int) () from /usr/lib/i386-linux-gnu/libKF5WindowSystem.so.5
#59 0xae0de3f2 in ?? () from /usr/lib/i386-linux-gnu/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#60 0xb65db0b7 in NETRootInfo::update(QFlags<NET::Property>, QFlags<NET::Property2>) () from /usr/lib/i386-linux-gnu/libKF5WindowSystem.so.5
#61 0xb65dbffb in NETRootInfo::event(xcb_generic_event_t*, QFlags<NET::Property>*, QFlags<NET::Property2>*) () from /usr/lib/i386-linux-gnu/libKF5WindowSystem.so.5
#62 0xb65dc393 in NETRootInfo::event(xcb_generic_event_t*, unsigned long*, int) () from /usr/lib/i386-linux-gnu/libKF5WindowSystem.so.5

(gdb) frame 14
#14 0xb50ad8ae in QSortFilterProxyModelPrivate::updateChildrenMapping (this=<optimized out>, source_parent=..., parent_mapping=<optimized out>, orient=Qt::Vertical, start=<optimized out>, end=<optimized out>, delta_item_count=<optimized out>, remove=true)
    at itemmodels/qsortfilterproxymodel.cpp:1002

(gdb) x/48x it2-6
0x87737308:     0x00000001      0x00000007      0x0000000f      0x00000010
0x87737318:     0x00000000      0x00000000      0x0000000a      0x818123f0
0x87737328:     0x00000000      0x00000000      0x00000009      0x818123f0
0x87737338:     0x00000001      0x00000000      0x00000008      0x818123f0
0x87737348:     0x00000002      0x00000000      0x00000008      0x818123f0
0x87737358:     0x00000000      0x00000000      0x00000008      0x818123f0
0x87737368:     0x00000002      0x00000000      0x00000008      0x818123f0
0x87737378:     0x00000003      0x00000000      0x00000008      0x818123f0
0x87737388:     0x00000003      0x00000000      0x00000008      0x818123f0
0x87737398:     0x00000003      0x00000000      0x00000008      0x818123f0
0x877373a8:     0x00000003      0x00000000      0x00000008      0x818123f0
0x877373b8:     0x00000000      0x00000000      0x00000000      0x00000031

As you can see, the parent_mapping now contains not only identical QModelIndexes, but also different QModelIndexes of different parents. However, it should only contain indexes which are siblings. Note that the four dwords shown here are row/column/parent/model. So there should be only a single number in the third column.

My theory about how does this arise and how it leads to crashes goes like this:

1) TaskManager uses the third number of a QModelIndex as a row index of its parent in TaskGroupingProxyModel. That means that when a row is deleted, the subsequent rows change indexes, and therefore, their children's QModelIndexes change as well.
2) A group of three is created at position eg. 10. That creates parent index 10/0/0 and children 0/0/10, 1/0/10, 2/0/10 (modulo some +-1 error, because it's actually shifted by one, but whatever).
3) A row is destroyed at row <10, shifting our group one back. That leaves us with parent index 9/0/0, children 0/0/9, 1/0/9, 2/0/9. However, the mapped_children vector of QSortFilterProxyMappingPrivate still contains the original indexes 0/0/10 etc.
4) Eventually, QSFPMPrivate creates records for the new child indexes as well. The mapped_children are now 0/0/9, 1/0/9, 2/0/9, 0/0/10, 1/0/10, 2/0/10. Note that this is somewhat similar to what you see above.
5) The first child of the group is deleted. updateChildrenMapping will shift the rest of the indexes, but also it will make them have the same parent. mapped_children will now be 0/0/9, 1/0/9, 0/0/9, 1/0/9.
6) The next updateChildrenProxyMapping could see two identical indexes, which causes the crash described above.

What to do with it?

1. If the TaskManager's way of managing QModelIndexes should be legal, the bug is almost certainly on Qt's side. QSFPM should react to a row being deleted by not only changing the indexes of subsequent rows, but also their children. The easiest way to do it is to recurse in updateChildrenProxyMapping:

            // update mapping
            Mapping *cm = source_index_mapping.take(source_child_index);
            Q_ASSERT(cm);
            // we do not reinsert right away, because the new index might be identical with another, old index
            moved_source_index_mappings.append(QPair<QModelIndex, Mapping*>(new_index, cm));
            // reparent the children to the new index
            updateChildrenMapping(new_index, cm, orient, 0, -1, 0, 0);

I made that change to my Qt and it seems to work.

2. Or else, taskmanager should be rewritten NOT to use the third number in QModelIndex as a row index.

What do you think?

   Jiri Palecek
Comment 4 Jiri Palecek 2017-07-13 21:53:23 UTC 
David Edmundson this is not a duplicate of bug 342763, the backtraces are totally different (for one thing, the crash isn't occuring on slot activation). Could you consider rethinking this bug?
Comment 5 Christoph Feck 2017-07-17 17:21:22 UTC 

*** This bug has been marked as a duplicate of bug 381317 ***
Comment 6 Eike Hein 2017-08-02 17:13:38 UTC 
Jiri, just a note that I've seen your investigation, and many thanks for it. I'm looking into a solution.
Comment 7 Jiri Palecek 2017-08-05 11:54:03 UTC 
Thanks Eike, good to hear that. Could you elaborate on how is the issue likely going to be resolved? I mean, as a problem of Qt or Plasma?
Comment 8 Eike Hein 2017-08-07 09:40:54 UTC 
I see it as a problem of Plasma -- storing row indices in QMI was kind of against the spirit of the api (see "internalPointer"). This is about to go in:

https://phabricator.kde.org/D7139
Comment 9 Eike Hein 2017-08-07 10:41:35 UTC 
Argh, btw - I made a mental note to credit your super helpful investigation in the commit message when landing this, and then of course forgot :(. Really sorry, I'll try to find some alternative means to mention this somewhere at some point.