Created attachment 1738858 [details]
gdb output when run on kstars followed by the crash with the full trace

Description of problem:

I was using Plasma 5.20.4 on Wayland in Fedora 33. I started kstars 3.4.3 and clicked on Pointing > Find Object. I entered sagittarius in Filter by name then clicked OK. I moved the map around a bit. I clicked on Pointing > Find Object. I selected the Details button. kstars segmentation faulted in DetailDialog::createGeneralTab at /usr/src/debug/kstars-3.4.3-5.fc33.x86_64/kstars/dialogs/detaildialog.cpp:312 

-- Backtrace:
Application: KStars (kstars), signal: Segmentation fault

[KCrash Handler]
#4  DetailDialog::createGeneralTab (this=0x563726e7c5e0) at /usr/src/debug/kstars-3.4.3-5.fc33.x86_64/kstars/dialogs/detaildialog.cpp:312
#5  0x00005637216cc1fd in DetailDialog::DetailDialog (this=<optimized out>, o=<optimized out>, ut=..., geo=<optimized out>, parent=<optimized out>, this=<optimized out>, o=<optimized out>, ut=..., geo=<optimized out>, parent=<optimized out>) at /usr/src/debug/kstars-3.4.3-5.fc33.x86_64/kstars/dialogs/detaildialog.cpp:72
#6  0x00005637218384f3 in FindDialog::slotDetails (this=<optimized out>) at /usr/src/debug/kstars-3.4.3-5.fc33.x86_64/kstars/dialogs/finddialog.cpp:504
#7  FindDialog::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at /usr/src/debug/kstars-3.4.3-5.fc33.x86_64/x86_64-redhat-linux-gnu/kstars/KStarsLib_autogen/2NRMJ5X7RK/moc_finddialog.cpp:170
#8  0x00007f0a686a03c0 in doActivate<false> (sender=0x563726c5dae0, signal_index=9, argv=0x7ffd076650d0) at kernel/qobject.cpp:3898
#9  0x00007f0a6928c316 in QAbstractButton::clicked (this=this@entry=0x563726c5dae0, _t1=<optimized out>) at .moc/moc_qabstractbutton.cpp:308
#10 0x00007f0a6928ccde in QAbstractButtonPrivate::emitClicked (this=this@entry=0x563725868a00) at widgets/qabstractbutton.cpp:415
#11 0x00007f0a6928e673 in QAbstractButtonPrivate::click (this=this@entry=0x563725868a00) at widgets/qabstractbutton.cpp:408
#12 0x00007f0a6928e855 in QAbstractButton::mouseReleaseEvent (this=0x563726c5dae0, e=0x7ffd07665690) at widgets/qabstractbutton.cpp:1044
#13 0x00007f0a691ddb1e in QWidget::event (this=0x563726c5dae0, event=0x7ffd07665690) at kernel/qwidget.cpp:9019
#14 0x00007f0a6919cec3 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x563726c5dae0, e=0x7ffd07665690) at kernel/qapplication.cpp:3632
#15 0x00007f0a691a3eeb in QApplication::notify(QObject*, QEvent*) () at kernel/qapplication.cpp:3076
#16 0x00007f0a68670bd8 in QCoreApplication::notifyInternal2 (receiver=0x563726c5dae0, event=0x7ffd07665690) at kernel/qcoreapplication.cpp:1063
#17 0x00007f0a691a2efa in QApplicationPrivate::sendMouseEvent (receiver=0x563726c5dae0, event=0x7ffd07665690, alienWidget=0x563726c5dae0, nativeWidget=0x56372659e2c0, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true, onlyDispatchEnterLeave=false) at kernel/qapplication.cpp:2614
#18 0x00007f0a691f6375 in QWidgetWindow::handleMouseEvent (this=0x563725864ed0, event=0x7ffd07665940) at kernel/qwidgetwindow.cpp:683
#19 0x00007f0a691f96be in QWidgetWindow::event (this=0x563725864ed0, event=0x7ffd07665940) at kernel/qwidgetwindow.cpp:300
#20 0x00007f0a6919cec3 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x563725864ed0, e=0x7ffd07665940) at kernel/qapplication.cpp:3632
#21 0x00007f0a68670bd8 in QCoreApplication::notifyInternal2 (receiver=0x563725864ed0, event=0x7ffd07665940) at kernel/qcoreapplication.cpp:1063
#22 0x00007f0a68b3f143 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at kernel/qguiapplication.cpp:2275
#23 0x00007f0a68b208cc in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:1169
#24 0x00007f0a55f7de24 in userEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5WaylandClient.so.5
#25 0x00007f0a66b7a7ef in g_main_dispatch (context=0x5637232e9ed0) at ../glib/gmain.c:3325
#26 g_main_context_dispatch (context=0x5637232e9ed0) at ../glib/gmain.c:4043
#27 0x00007f0a66bcc5d8 in g_main_context_iterate.constprop.0 (context=context@entry=0x5637232e9ed0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4119
#28 0x00007f0a66b77bc3 in g_main_context_iteration (context=0x5637232e9ed0, may_block=1) at ../glib/gmain.c:4184
#29 0x00007f0a686bd6f3 in QEventDispatcherGlib::processEvents (this=0x5637232cda50, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#30 0x00007f0a6866f57b in QEventLoop::exec (this=0x7ffd07665c80, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#31 0x00007f0a6939cf8f in QDialog::exec (this=0x56372659e2c0) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#32 0x00005637217f4a4f in KStars::slotFind (this=0x5637232db550) at /usr/src/debug/kstars-3.4.3-5.fc33.x86_64/kstars/kstarsactions.cpp:1174
#33 KStars::qt_static_metacall (_o=0x5637232db550, _c=<optimized out>, _id=<optimized out>, _a=0x7ffd07665f10) at /usr/src/debug/kstars-3.4.3-5.fc33.x86_64/x86_64-redhat-linux-gnu/kstars/KStarsLib_autogen/EWIEGA46WW/moc_kstars.cpp:723
#34 0x00007f0a686a03c0 in doActivate<false> (sender=0x5637261e4710, signal_index=4, argv=0x7ffd07665f10) at kernel/qobject.cpp:3898
#35 0x00007f0a69196646 in QAction::triggered (this=this@entry=0x5637261e4710, _t1=<optimized out>) at .moc/moc_qaction.cpp:376
#36 0x00007f0a69198f31 in QAction::activate (this=0x5637261e4710, event=<optimized out>) at kernel/qaction.cpp:1161
#37 0x00007f0a69317e9a in QMenuPrivate::activateCausedStack (this=this@entry=0x563726832e00, causedStack=..., action=action@entry=0x5637261e4710, action_e=action_e@entry=QAction::Trigger, self=self@entry=true) at widgets/qmenu.cpp:1384
#38 0x00007f0a6931f512 in QMenuPrivate::activateAction (this=0x563726832e00, action=0x5637261e4710, action_e=QAction::Trigger, self=<optimized out>) at widgets/qmenu.cpp:1461
#39 0x00007f0a691ddb1e in QWidget::event (this=0x5637268166f0, event=0x7ffd07666580) at kernel/qwidget.cpp:9019
#40 0x00007f0a6919cec3 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x5637268166f0, e=0x7ffd07666580) at kernel/qapplication.cpp:3632
#41 0x00007f0a691a3eeb in QApplication::notify(QObject*, QEvent*) () at kernel/qapplication.cpp:3076
#42 0x00007f0a68670bd8 in QCoreApplication::notifyInternal2 (receiver=0x5637268166f0, event=0x7ffd07666580) at kernel/qcoreapplication.cpp:1063
#43 0x00007f0a691a2efa in QApplicationPrivate::sendMouseEvent (receiver=0x5637268166f0, event=0x7ffd07666580, alienWidget=0x0, nativeWidget=0x5637268166f0, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true, onlyDispatchEnterLeave=false) at kernel/qapplication.cpp:2614
#44 0x00007f0a691f68e3 in QWidgetWindow::handleMouseEvent (this=0x5637264e5200, event=0x7ffd07666830) at kernel/qwidgetwindow.cpp:580
#45 0x00007f0a691f96be in QWidgetWindow::event (this=0x5637264e5200, event=0x7ffd07666830) at kernel/qwidgetwindow.cpp:300
#46 0x00007f0a6919cec3 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x5637264e5200, e=0x7ffd07666830) at kernel/qapplication.cpp:3632
#47 0x00007f0a68670bd8 in QCoreApplication::notifyInternal2 (receiver=0x5637264e5200, event=0x7ffd07666830) at kernel/qcoreapplication.cpp:1063
#48 0x00007f0a68b3f143 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at kernel/qguiapplication.cpp:2275
#49 0x00007f0a68b208cc in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:1169
#50 0x00007f0a55f7de24 in userEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5WaylandClient.so.5
#51 0x00007f0a66b7a7ef in g_main_dispatch (context=0x5637232e9ed0) at ../glib/gmain.c:3325
#52 g_main_context_dispatch (context=0x5637232e9ed0) at ../glib/gmain.c:4043
#53 0x00007f0a66bcc5d8 in g_main_context_iterate.constprop.0 (context=context@entry=0x5637232e9ed0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4119
#54 0x00007f0a66b77bc3 in g_main_context_iteration (context=0x5637232e9ed0, may_block=1) at ../glib/gmain.c:4184
#55 0x00007f0a686bd6f3 in QEventDispatcherGlib::processEvents (this=0x5637232cda50, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#56 0x00007f0a6866f57b in QEventLoop::exec (this=0x7ffd07666b60, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#57 0x00007f0a686771b4 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#58 0x00005637215eb05e in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kstars-3.4.3-5.fc33.x86_64/kstars/main.cpp:346
[Inferior 1 (process 1830) detached]

Reported using DrKonqi

Clicking on Pointing > Find Object, entering sagittarius in Filter by name, and selecting the Details button was all that was required for the crash to happen in further tries. When I ran kstars from konsole and under gdb, the following error was shown when the crash occurred.
QWaylandShmBuffer: mmap failed (Invalid argument)

Running kstars under gdb indicated that the pointer this in frame 0 pointed to an inaccessible address.
(gdb) p this
$1 = (DetailDialog * const) 0x555558b4ecc0
(gdb) x this
0x555558b4ecc0: 0x561463b8
(gdb) x 0x561463b8
0x561463b8:     Cannot access memory at address 0x561463b8

I'm attaching the gdb output with the full trace. The pointer dso = 0x0 in frame 0 in DetailDialog::createGeneralTab in the full trace which might indicate a null pointer dereference happened at detaildialog.cpp:312 
if (!dso->longname().isEmpty() && dso->longname() != dso->name())

Version-Release number of selected component (if applicable):
kstars-3.4.3-5.fc33.x86_64
plasma-desktop-5.20.4-1.fc33.x86_64
qt5-qtbase-5.15.2-2.fc33.x86_64
kf5-plasma-5.75.0-1.fc33.x86_64

How reproducible:
This crash happened each of several times I tried.

Steps to Reproduce:
1. Boot a F33 KDE Plasma installation with kstars, kwin-wayland, plasma-workspace-wayland installed
2. Log in to Plasma on Wayland
3. Run kstars
4. Click on Pointing > Find Object
5. enter sagittarius in Filter by name
6. select the Details button 

Actual results:
kstars segmentation faulted in DetailDialog::createGeneralTab

Expected results:
No crash would happen.

Additional info:
I reported this problem at https://bugs.kde.org/show_bug.cgi?id=430325

Crashes with this trace happened with both of kstars-3.4.3-4.fc33 with LTO disabled due to the problem at https://bugzilla.redhat.com/show_bug.cgi?id=1881915 and kstars-3.4.3-5.fc33 with LTO enabled and -fPIC from koji. This problem isn't likely to be related to the LTO problem. The crash happened when I ran kstars on X in Plasma on Wayland with QT_QPA_PLATFORM=xcb kstars & so the problem probably isn't specific to Wayland.