Bug 408172

Application: systemsettings5 (5.14.5)

Qt Version: 5.11.3
Frameworks Version: 5.54.0
Operating System: Linux 4.19.0-5-amd64 x86_64
Distribution: Debian GNU/Linux 10 (buster)

-- Information about the crash:
I was trying to install a GTK application style by clicking on the "get new themes" button and then selecting "install a local theme". The first time I had tried to select one using the file browser and it wouldn't install so I closed the dialog and the system settings app and then I got the crash. I tried again and can reproduce the crash every time just by bringing up the "install a local theme" dialog and then closing it and system settings without doing anything else.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8d0445bcc0 (LWP 6368))]

Thread 6 (Thread 0x7f8cf2601700 (LWP 6375)):
#0  0x00007f8d08dc2494 in __GI___libc_read (nbytes=16, buf=0x7f8cf2600b20, fd=13) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f8d08dc2494 in __GI___libc_read (fd=13, buf=0x7f8cf2600b20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f8d06a21aa0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8d069dbc0f in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8d069dc0e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f8d069dc25c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f8d092d887b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f8d0928627b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8d090d5ec6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f8d084edc65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f8d090dfaa7 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f8d07679fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#12 0x00007f8d08dd14cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f8cf3fff700 (LWP 6374)):
#0  0x00007f8d06a25e84 in g_mutex_unlock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f8d069db91e in g_main_context_query () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8d069dc0b7 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8d069dc25c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8d092d887b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8d0928627b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8d090d5ec6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f8d084edc65 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f8d090dfaa7 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f8d07679fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#10 0x00007f8d08dd14cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f8cf9e48700 (LWP 6372)):
#0  0x00007f8d0768000c in futex_wait_cancelable (private=0, expected=0, futex_word=0x56260338b4f8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f8d0768000c in __pthread_cond_wait_common (abstime=0x0, mutex=0x56260338b4a8, cond=0x56260338b4d0) at pthread_cond_wait.c:502
#2  0x00007f8d0768000c in __pthread_cond_wait (cond=0x56260338b4d0, mutex=0x56260338b4a8) at pthread_cond_wait.c:655
#3  0x00007f8cfa3f8e63 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007f8cfa3f8bb7 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007f8d07679fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f8d08dd14cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f8cfbfff700 (LWP 6371)):
#0  0x00007f8d08dc6819 in __GI___poll (fds=0x7f8cf4004db0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f8d069dc136 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8d069dc25c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8d092d887b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f8d0928627b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8d090d5ec6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8d0952e545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f8d090dfaa7 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8d07679fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007f8d08dd14cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f8d0347f700 (LWP 6370)):
#0  0x00007f8d08dc6819 in __GI___poll (fds=0x7f8d0347ec78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f8d0763acf7 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f8d0763c91a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f8d03fedd79 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f8d090dfaa7 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8d07679fa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f8d08dd14cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f8d0445bcc0 (LWP 6368)):
[KCrash Handler]
#6  0x00007f8d09e22176 in QDialogButtonBox::button(QDialogButtonBox::StandardButton) const () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00007f8cf0ab23c3 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kcm_kdegtkconfig.so
#8  0x00007f8d092b0a43 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f8d0a275b19 in KJob::finished(KJob*, KJob::QPrivateSignal) () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#10 0x00007f8d0a276268 in KJob::~KJob() () at /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#11 0x00007f8cf0ab89f0 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kcm_kdegtkconfig.so
#12 0x00007f8cf0ab3c12 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kcm_kdegtkconfig.so
#13 0x00007f8cf0ab3c49 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kcm_kdegtkconfig.so
#14 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007f8d0a5f249f in KCModule::~KCModule() () at /usr/lib/x86_64-linux-gnu/libKF5ConfigWidgets.so.5
#17 0x00007f8cf0aa8619 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/kcm_kdegtkconfig.so
#18 0x00007f8d0a7ccfb4 in KCModuleProxy::deleteClient() () at /usr/lib/x86_64-linux-gnu/libKF5KCMUtils.so.5
#19 0x00007f8d0a7cd05f in KCModuleProxy::~KCModuleProxy() () at /usr/lib/x86_64-linux-gnu/libKF5KCMUtils.so.5
#20 0x00007f8d0a7cd209 in KCModuleProxy::~KCModuleProxy() () at /usr/lib/x86_64-linux-gnu/libKF5KCMUtils.so.5
#21 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f8d09cd60b9 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007f8d09e24519 in QScrollArea::~QScrollArea() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007f8d0a50e7cd in  () at /usr/lib/x86_64-linux-gnu/libKF5WidgetsAddons.so.5
#30 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007f8d0a4f8119 in KPageWidget::~KPageWidget() () at /usr/lib/x86_64-linux-gnu/libKF5WidgetsAddons.so.5
#33 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007f8d0a80dd79 in ModuleView::~ModuleView() () at /usr/lib/x86_64-linux-gnu/libsystemsettingsview.so.3
#36 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#38 0x00007f8cf93e7671 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/systemsettings_sidebar_mode.so
#39 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#41 0x00007f8d09e397f9 in QStackedWidget::~QStackedWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#42 0x00007f8d092ae86b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#43 0x00007f8d09cd5eb6 in QWidget::~QWidget() () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#44 0x00007f8d0a711cc4 in KMainWindow::~KMainWindow() () at /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#45 0x00005626015c337b in  ()
#46 0x00005626015c33d9 in  ()
#47 0x00007f8d092b11a0 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#48 0x00007f8d09cdaa1b in QWidget::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#49 0x00007f8d09de0de4 in QMainWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#50 0x00007f8d0a71417b in KMainWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#51 0x00007f8d0a75e115 in KXmlGuiWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#52 0x00007f8d09c9c4b1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#53 0x00007f8d09ca3950 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#54 0x00007f8d092875a9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#55 0x00007f8d0928a59b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#56 0x00007f8d092d9233 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#57 0x00007f8d069dbf2e in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#58 0x00007f8d069dc1c8 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#59 0x00007f8d069dc25c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#60 0x00007f8d092d8863 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#61 0x00007f8d040843e1 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#62 0x00007f8d0928627b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#63 0x00007f8d0928e262 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#64 0x00005626015c05aa in  ()
#65 0x00007f8d08cfc09b in __libc_start_main (main=0x5626015c01c0, argc=1, argv=0x7ffd1855a7d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd1855a7c8) at ../csu/libc-start.c:308
#66 0x00005626015c062a in _start ()
[Inferior 1 (process 6368) detached]

Reported using DrKonqi