Bug 400848

Summary:	Discover crashes at startup after update to Qt 5.12 beta4
Product:	[Applications] Discover	Reporter:	Patrick Silva <bugseforuns>
Component:	discover	Assignee:	Aleix Pol <aleixpol>
Status:	RESOLVED UPSTREAM
Severity:	crash	CC:	arojas
Priority:	NOR
Version First Reported In:	5.14.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Patrick Silva 2018-11-08 16:15:19 UTC

Today I updated Qt to 5.12 beta4 on Arch Linux, now I can't use Discover,
it crashes at startup.


Operating System: Arch Linux 
KDE Plasma Version: 5.14.3
Qt Version: 5.12.0 beta4
KDE Frameworks Version: 5.51.0

Undefined command: "threah".  Try "help".

Thread 19 (Thread 0x7fff9ffff700 (LWP 10169)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007fffe43f501c in  () at /usr/lib/libresolv.so.2
#2  0x00007fffe43f2a11 in __res_context_query () at /usr/lib/libresolv.so.2
#3  0x00007fffe43f3059 in  () at /usr/lib/libresolv.so.2
#4  0x00007fffe43f364d in __res_context_search () at /usr/lib/libresolv.so.2
#5  0x00007fffd93d6e6d in _nss_dns_gethostbyname4_r () at /usr/lib/libnss_dns.so.2
#6  0x00007ffff5b4f012 in gaih_inet.constprop () at /usr/lib/libc.so.6
#7  0x00007ffff5b50038 in getaddrinfo () at /usr/lib/libc.so.6
#8  0x00007fffe482e9b1 in  () at /usr/lib/libgio-2.0.so.0
#9  0x00007fffe482ecd6 in  () at /usr/lib/libgio-2.0.so.0
#10 0x00007ffff4320bd6 in  () at /usr/lib/libglib-2.0.so.0
#11 0x00007ffff43193eb in  () at /usr/lib/libglib-2.0.so.0
#12 0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#13 0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 18 (Thread 0x7fffacf78700 (LWP 10168)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007fffe43f501c in  () at /usr/lib/libresolv.so.2
#2  0x00007fffe43f2a11 in __res_context_query () at /usr/lib/libresolv.so.2
#3  0x00007fffe43f3059 in  () at /usr/lib/libresolv.so.2
#4  0x00007fffe43f364d in __res_context_search () at /usr/lib/libresolv.so.2
#5  0x00007fffd93d6e6d in _nss_dns_gethostbyname4_r () at /usr/lib/libnss_dns.so.2
#6  0x00007ffff5b4f012 in gaih_inet.constprop () at /usr/lib/libc.so.6
#7  0x00007ffff5b50038 in getaddrinfo () at /usr/lib/libc.so.6
#8  0x00007fffe482e9b1 in  () at /usr/lib/libgio-2.0.so.0
#9  0x00007fffe482ecd6 in  () at /usr/lib/libgio-2.0.so.0
#10 0x00007ffff4320bd6 in  () at /usr/lib/libglib-2.0.so.0
#11 0x00007ffff43193eb in  () at /usr/lib/libglib-2.0.so.0
#12 0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#13 0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 17 (Thread 0x7fffadffc700 (LWP 10167)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fffbf642f9f in  () at /usr/lib/libostree-1.so.1
#4  0x00007ffff43193eb in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 16 (Thread 0x7fffae7fd700 (LWP 10166)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fffbf642f9f in  () at /usr/lib/libostree-1.so.1
#4  0x00007ffff43193eb in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7fffaf7fe700 (LWP 10165)):
#0  0x00007ffff4e19afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ffff5e83adc in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007ffff5e83bca in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007ffff7a364cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007ffff7a3673c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#6  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7fffaffff700 (LWP 10164)):
#0  0x00007ffff5b604ed in syscall () at /usr/lib/libc.so.6
#1  0x00007ffff5e7fd75 in QSemaphore::acquire(int) () at /usr/lib/libQt5Core.so.5
#2  0x00007ffff606450a in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#3  0x00007ffff55e44f3 in  () at /usr/lib/libQt5Network.so.5
#4  0x00007ffff55e533d in  () at /usr/lib/libQt5Network.so.5
#5  0x00007ffff606426c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#6  0x00007ffff55e34e3 in  () at /usr/lib/libQt5Network.so.5
#7  0x00007ffff552fc38 in  () at /usr/lib/libQt5Network.so.5
#8  0x00007ffff553143c in  () at /usr/lib/libQt5Network.so.5
#9  0x00007ffff606426c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#10 0x00007ffff55b0f83 in QSslSocket::preSharedKeyAuthenticationRequired(QSslPreSharedKeyAuthenticator*) () at /usr/lib/libQt5Network.so.5
#11 0x00007ffff55d03b3 in  () at /usr/lib/libQt5Network.so.5
#12 0x00007ffff3f6591e in  () at /usr/lib/libssl.so.1.1
#13 0x00007ffff3f6383a in  () at /usr/lib/libssl.so.1.1
#14 0x00007ffff3f6dc89 in  () at /usr/lib/libssl.so.1.1
#15 0x00007ffff3f6cb60 in  () at /usr/lib/libssl.so.1.1
#16 0x00007ffff3f58496 in SSL_do_handshake () at /usr/lib/libssl.so.1.1
#17 0x00007ffff55d0ad6 in  () at /usr/lib/libQt5Network.so.5
#18 0x00007ffff55d0eb5 in  () at /usr/lib/libQt5Network.so.5
#19 0x00007ffff55b1dc9 in QSslSocket::startClientEncryption() () at /usr/lib/libQt5Network.so.5
#20 0x00007ffff55b3001 in  () at /usr/lib/libQt5Network.so.5
#21 0x00007ffff55b93f1 in  () at /usr/lib/libQt5Network.so.5
#22 0x00007ffff606426c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#23 0x00007ffff557c80e in  () at /usr/lib/libQt5Network.so.5
#24 0x00007ffff557f7d0 in  () at /usr/lib/libQt5Network.so.5
#25 0x00007ffff558ee3d in  () at /usr/lib/libQt5Network.so.5
#26 0x00007ffff6f3be34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#27 0x00007ffff6f43671 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#28 0x00007ffff60398f9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#29 0x00007ffff60901f6 in  () at /usr/lib/libQt5Core.so.5
#30 0x00007ffff434e3cf in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#31 0x00007ffff434ff89 in  () at /usr/lib/libglib-2.0.so.0
#32 0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#33 0x00007ffff608f579 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#34 0x00007ffff603858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#35 0x00007ffff5e7c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#36 0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#37 0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#38 0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7fffbca47700 (LWP 10163)):
#0  0x00007ffff4e19ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ffff5e83a59 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007ffff5e83b97 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007ffff5e81bb4 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#5  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7fffbdafb700 (LWP 10159)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fffbf641726 in  () at /usr/lib/libostree-1.so.1
#4  0x00007fffbf60791f in  () at /usr/lib/libostree-1.so.1
#5  0x00007fffbf61153e in ostree_repo_remote_fetch_summary_with_options () at /usr/lib/libostree-1.so.1
#6  0x00007fffbf5f1bf7 in ostree_repo_remote_fetch_summary () at /usr/lib/libostree-1.so.1
#7  0x00007fffbfa32a28 in  () at /usr/lib/libflatpak.so.0
#8  0x00007fffbfa32f88 in  () at /usr/lib/libflatpak.so.0
#9  0x00007fffbfa6b57b in flatpak_installation_fetch_remote_size_sync () at /usr/lib/libflatpak.so.0
#10 0x00007fffd80af9a5 in FlatpakRunnables::fetchFlatpakSize(_FlatpakInstallation*, FlatpakResource*) (installation=0x7fffc8013ee0, app=0x55555574a0c0) at /usr/include/qt/QtCore/qarraydata.h:208
#11 0x00007fffd80aacae in non-virtual thunk to QtConcurrent::RunFunctionTask<FlatpakRunnables::SizeInformation>::run() () at /usr/include/c++/8.2.1/new:169
#12 0x00007ffff5e819a1 in  () at /usr/lib/libQt5Core.so.5
#13 0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#14 0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#15 0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7fffbe2fc700 (LWP 10158)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fffbf641726 in  () at /usr/lib/libostree-1.so.1
#4  0x00007fffbf60791f in  () at /usr/lib/libostree-1.so.1
#5  0x00007fffbf61153e in ostree_repo_remote_fetch_summary_with_options () at /usr/lib/libostree-1.so.1
#6  0x00007fffbf5f1bf7 in ostree_repo_remote_fetch_summary () at /usr/lib/libostree-1.so.1
#7  0x00007fffbfa32a28 in  () at /usr/lib/libflatpak.so.0
#8  0x00007fffbfa32f88 in  () at /usr/lib/libflatpak.so.0
#9  0x00007fffbfa6b57b in flatpak_installation_fetch_remote_size_sync () at /usr/lib/libflatpak.so.0
#10 0x00007fffd80af9a5 in FlatpakRunnables::fetchFlatpakSize(_FlatpakInstallation*, FlatpakResource*) (installation=0x7fffc8013ee0, app=0x5555558d6ee0) at /usr/include/qt/QtCore/qarraydata.h:208
#11 0x00007fffd80aacae in non-virtual thunk to QtConcurrent::RunFunctionTask<FlatpakRunnables::SizeInformation>::run() () at /usr/include/c++/8.2.1/new:169
#12 0x00007ffff5e819a1 in  () at /usr/lib/libQt5Core.so.5
#13 0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#14 0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#15 0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7fffd88c5700 (LWP 10157)):
#0  0x00007ffff4e19ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ffff5e83a59 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007ffff5e83b97 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007ffff5e81bb4 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#5  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7fffd90c6700 (LWP 10156)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ffff608f579 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ffff603858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ffff5e7c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7fffd9ce6700 (LWP 10155)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ffff608f579 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ffff603858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ffff5e7c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7fffda5b2700 (LWP 10154)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff4350f62 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#3  0x00007fffe47c8c28 in  () at /usr/lib/libgio-2.0.so.0
#4  0x00007ffff43193eb in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7fffdadb3700 (LWP 10153)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ffff4350022 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007ffff43193eb in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7fffe55af700 (LWP 10152)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ffff608f579 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ffff603858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ffff5e7c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ffff79aee5b in  () at /usr/lib/libQt5Quick.so.5
#7  0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7fffe67f6700 (LWP 10151)):
#0  0x00007ffff4e19afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fffe6e131ac in  () at /usr/lib/dri/i965_dri.so
#2  0x00007fffe6e12ee8 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7fffed430700 (LWP 10149)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ffff608f579 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ffff603858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ffff5e7c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ffff669b9e9 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fffee641700 (LWP 10148)):
#0  0x00007ffff5b5ac21 in poll () at /usr/lib/libc.so.6
#1  0x00007ffff434fee0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ffff608f579 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ffff603858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ffff5e7c5c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ffff7465ba6 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007ffff5e7d9cc in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ffff4e13a9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ffff5b65b23 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7ffff0e3ff80 (LWP 10144)):
#0  0x00007ffff6066833 in  () at /usr/lib/libQt5Core.so.5
#1  0x00007ffff6066d38 in QObject::disconnectImpl(QObject const*, void**, QObject const*, void**, QMetaObject const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007fffefff2cbd in QQuickMenuPrivate::setParentMenu(QQuickMenu*) () at /usr/lib/libQt5QuickTemplates2.so.5
#3  0x00007fffefff45d2 in QQuickMenuPrivate::removeItem(int, QQuickItem*) () at /usr/lib/libQt5QuickTemplates2.so.5
#4  0x00007fffefff490d in QQuickMenuPrivate::itemParentChanged(QQuickItem*, QQuickItem*) () at /usr/lib/libQt5QuickTemplates2.so.5
#5  0x00007ffff7a748d7 in QQuickItemPrivate::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&) () at /usr/lib/libQt5Quick.so.5
#6  0x00007ffff7a7abb6 in QQuickItem::setParentItem(QQuickItem*) () at /usr/lib/libQt5Quick.so.5
#7  0x00007ffff7a7b1fd in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#8  0x00007ffff7a9d607 in  () at /usr/lib/libQt5Quick.so.5
#9  0x00007ffff60621ab in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#10 0x00007ffff606b165 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#11 0x00007fffe7a55f4f in  () at /usr/lib/qt/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#12 0x00007ffff60621ab in QObjectPrivate::deleteChildren() () at /usr/lib/libQt5Core.so.5
#13 0x00007ffff606b165 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#14 0x00007ffff7a7b2cc in QQuickItem::~QQuickItem() () at /usr/lib/libQt5Quick.so.5
#15 0x00007fffe7a5415f in  () at /usr/lib/qt/qml/QtQuick/Templates.2/libqtquicktemplates2plugin.so
#16 0x00007ffff6064b61 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#17 0x00007ffff7a7977c in QQuickItem::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#18 0x00007ffff6f3be34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#19 0x00007ffff6f43671 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#20 0x00007ffff60398f9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#21 0x00007ffff603c998 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#22 0x00007ffff608ffa4 in  () at /usr/lib/libQt5Core.so.5
#23 0x00007ffff434e3cf in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#24 0x00007ffff434ff89 in  () at /usr/lib/libglib-2.0.so.0
#25 0x00007ffff434ffce in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#26 0x00007ffff608f579 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#27 0x00007ffff603858c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#28 0x00007ffff6040896 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#29 0x0000555555567616 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/discover-5.14.3/discover/main.cpp:156

Comment 1 Antonio Rojas 2018-11-08 22:29:30 UTC

Confirmed, regression from http://code.qt.io/cgit/qt/qtquickcontrols2.git/commit/?id=953fbac6131823e4fce0eb4707a854469c4c04ff

Comment 2 Aleix Pol 2018-11-09 01:11:44 UTC

Sorry for being that guy, but maybe you shouldn't be using Qt beta.

I'm also running it and I know there's several bugs that you'll keep finding. We're working on solving them all.

One thing you could consider is seeing if there's a difference between running "plasma-discover" and "plasma-discover --mode installed".

Comment 3 Aleix Pol 2018-11-09 01:13:33 UTC

Antonio, do you know if it's reported? It will help to get a fix.

I don't have the crash on my system though, so it may already have been fixed.

Comment 4 Antonio Rojas 2018-11-09 07:25:38 UTC

(In reply to Aleix Pol from comment #2)
> Sorry for being that guy, but maybe you shouldn't be using Qt beta.

I don't think this is fair, many issues in Plasma have been reported (and some fixed) thanks to users testing and reporting them, which may not have otherwise been fixed by the time 5.12 is released. This is especially important for Qt, which tends to make quite invasive changes during the beta phase that cause regressions (beta 3 broke plasma-pa, now beta 4 breaks discover)

(In reply to Aleix Pol from comment #3)
> Antonio, do you know if it's reported? It will help to get a fix.
> 
> I don't have the crash on my system though, so it may already have been
> fixed.

There are no commits to quickcontrols2 after this one, so I doubt it's fixed. It may be related to https://bugreports.qt.io/browse/QTBUG-71467

Comment 5 Patrick Silva 2018-11-09 09:26:07 UTC

(In reply to Aleix Pol from comment #2)
> One thing you could consider is seeing if there's a difference between
> running "plasma-discover" and "plasma-discover --mode installed".

It also crashes with "plasma-discover --mode installed".

Comment 6 Aleix Pol 2018-11-13 14:50:35 UTC

I can reproduce this crash now, only at close though.
And I confirm that reverting 953fbac6131823e4fce0eb4707a854469c4c04ff in QQC2 fixes the crash.

Comment 7 Aleix Pol 2018-11-13 15:01:31 UTC

This is a crash in Qt:
https://bugreports.qt.io/browse/QTBUG-71770