Bug 397547

Application: systemsettings5 (5.13.80)

Qt Version: 5.11.1
Frameworks Version: 5.50.0
Operating System: Linux 4.15.0-32-generic x86_64
Distribution: KDE neon Developer Edition

-- Information about the crash:
- What I was doing when the application crashed:
  - Open system settings
  - Open “Workspace theme”
  - Open “Cursor theme”

- Unusual behavior I noticed:
  - In wayland sessions, my mouse cursor is much bigger in KDE apps windows and in Plasma than in GNOME windows (and VLC for some reason) which is why I tried to change these settings

Neon dev unstable on Bionic

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 0x7f359073b840 (LWP 24687))]

Thread 5 (Thread 0x7f355c391700 (LWP 24691)):
#0  0x00007f358bd4b0b4 in __GI___libc_read (fd=17, buf=0x7f355c390b30, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f35850ee960 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f35850a9f27 in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f35850aa3e0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f35850aa54c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f358c68fa9b in QEventDispatcherGlib::processEvents (this=0x7f3554000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007f358c633dea in QEventLoop::exec (this=this@entry=0x7f355c390d40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#7  0x00007f358c45eb8a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#8  0x00007f358a15d8b5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f358c469aab in QThreadPrivate::start (arg=0x5635a8ae01f0) at thread/qthread_unix.cpp:367
#10 0x00007f35874686db in start_thread (arg=0x7f355c391700) at pthread_create.c:463
#11 0x00007f358bd5c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f35679b1700 (LWP 24690)):
#0  0x00007f35850a92e0 in g_main_context_acquire () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f35850aa2f5 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f35850aa54c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f358c68fa9b in QEventDispatcherGlib::processEvents (this=0x7f3560000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f358c633dea in QEventLoop::exec (this=this@entry=0x7f35679b0d40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#5  0x00007f358c45eb8a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#6  0x00007f358a15d8b5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f358c469aab in QThreadPrivate::start (arg=0x5635a292b640) at thread/qthread_unix.cpp:367
#8  0x00007f35874686db in start_thread (arg=0x7f35679b1700) at pthread_create.c:463
#9  0x00007f358bd5c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f356f8aa700 (LWP 24689)):
#0  0x00007f35850efcd9 in g_mutex_lock () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f35850a92e0 in g_main_context_acquire () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f35850aa2f5 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f35850aa54c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f358c68fa9b in QEventDispatcherGlib::processEvents (this=0x7f3568000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007f358c633dea in QEventLoop::exec (this=this@entry=0x7f356f8a9d40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#6  0x00007f358c45eb8a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#7  0x00007f358a15d8b5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f358c469aab in QThreadPrivate::start (arg=0x5635a269f1d0) at thread/qthread_unix.cpp:367
#9  0x00007f35874686db in start_thread (arg=0x7f356f8aa700) at pthread_create.c:463
#10 0x00007f358bd5c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f357a2da700 (LWP 24688)):
#0  0x00007f358bd4b0b4 in __GI___libc_read (fd=6, buf=0x7f357a2d9b20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f35850ee960 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f35850a9f27 in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f35850aa3e0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f35850aa54c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f358c68fa9b in QEventDispatcherGlib::processEvents (this=0x7f3574000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#6  0x00007f358c633dea in QEventLoop::exec (this=this@entry=0x7f357a2d9d30, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#7  0x00007f358c45eb8a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#8  0x00007f358cad7e45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007f358c469aab in QThreadPrivate::start (arg=0x7f358cd4fd60) at thread/qthread_unix.cpp:367
#10 0x00007f35874686db in start_thread (arg=0x7f357a2da700) at pthread_create.c:463
#11 0x00007f358bd5c88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f359073b840 (LWP 24687)):
[KCrash Handler]
#6  QQuickWindowPrivate::removeGrabber (this=this@entry=0x200000000, grabber=0x5635a9dce230, mouse=mouse@entry=true, touch=touch@entry=true) at items/qquickwindow.cpp:813
#7  0x00007f358a69ead0 in QQuickItemPrivate::derefWindow (this=this@entry=0x5635aa1f44d0) at items/qquickitem.cpp:3050
#8  0x00007f358a69f047 in QQuickItem::setParentItem (this=0x5635a9dce230, parentItem=parentItem@entry=0x0) at items/qquickitem.cpp:2741
#9  0x00007f358a6a0a6c in QQuickItem::~QQuickItem (this=0x5635a9dcdf00, __in_chrg=<optimized out>) at items/qquickitem.cpp:2391
#10 0x00007f356c5b419d in QQuickItemDelegate::~QQuickItemDelegate (this=0x5635a9dcdf00, __in_chrg=<optimized out>) at ../../../include/QtQuickTemplates2/5.11.1/QtQuickTemplates2/private/../../../../../src/quicktemplates2/qquickitemdelegate_p.h:57
#11 QQmlPrivate::QQmlElement<QQuickItemDelegate>::~QQmlElement (this=0x5635a9dcdf00, __in_chrg=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtQml/qqmlprivate.h:103
#12 QQmlPrivate::QQmlElement<QQuickItemDelegate>::~QQmlElement (this=0x5635a9dcdf00, __in_chrg=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtQml/qqmlprivate.h:103
#13 0x00007f358c665660 in QObject::event (this=this@entry=0x5635a9dcdf00, e=e@entry=0x5635a9fe2a70) at kernel/qobject.cpp:1242
#14 0x00007f358a69daeb in QQuickItem::event (this=0x5635a9dcdf00, ev=0x5635a9fe2a70) at items/qquickitem.cpp:8003
#15 0x00007f358d651e8c in QApplicationPrivate::notify_helper (this=this@entry=0x5635a22a0b90, receiver=receiver@entry=0x5635a9dcdf00, e=e@entry=0x5635a9fe2a70) at kernel/qapplication.cpp:3727
#16 0x00007f358d65945f in QApplication::notify (this=0x7ffcf97b7890, receiver=0x5635a9dcdf00, e=0x5635a9fe2a70) at kernel/qapplication.cpp:3486
#17 0x00007f358c635ab8 in QCoreApplication::notifyInternal2 (receiver=0x5635a9dcdf00, event=event@entry=0x5635a9fe2a70) at kernel/qcoreapplication.cpp:1048
#18 0x00007f358c6385fd in QCoreApplication::sendEvent (event=0x5635a9fe2a70, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#19 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x5635a2294a00) at kernel/qcoreapplication.cpp:1745
#20 0x00007f358c638bb8 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1599
#21 0x00007f358c690453 in postEventSourceDispatch (s=0x5635a22d4aa0) at kernel/qeventdispatcher_glib.cpp:276
#22 0x00007f35850aa287 in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f35850aa4c0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f35850aa54c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f358c68fa7f in QEventDispatcherGlib::processEvents (this=0x5635a22d1fd0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#26 0x00007f357faef571 in QPAEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#27 0x00007f358c633dea in QEventLoop::exec (this=this@entry=0x7ffcf97b77b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#28 0x00007f358c63cfa0 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1336
#29 0x00005635a1dd1e69 in main (argc=<optimized out>, argv=<optimized out>) at ./app/main.cpp:71

The reporter indicates this bug may be a duplicate of or related to bug 397367.

Possible duplicates by query: bug 397367.

Reported using DrKonqi