https://bugs.kde.org/show_bug.cgi?id=453363

--- Comment #3 from cellst...@gmail.com ---
Running ddd with QML extra env, as in linked docs:

env QV4_FORCE_INTERPRETER=1 ddd --debugger /bin/gdb latte-dock

Crash output of gdb (backtrace):

GNU DDD 3.3.12 (x86_64-unknown-linux-gnu), by Dorothea LReading symbols from
latte-dock...
(No debugging symbols found in latte-dock)
(gdb) run
Starting program: /usr/bin/latte-dock 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7ffff06e0640 (LWP 29142)]
[New Thread 0x7fffefedf640 (LWP 29143)]
[New Thread 0x7fffef648640 (LWP 29144)]
[New Thread 0x7fffecf9b640 (LWP 29145)]
[New Thread 0x7fffd96e9640 (LWP 29146)]
[New Thread 0x7fffd8ee8640 (LWP 29147)]
[New Thread 0x7fffcbfff640 (LWP 29148)]
[New Thread 0x7fffc3fff640 (LWP 29149)]
[New Thread 0x7fffcb7fe640 (LWP 29150)]
[New Thread 0x7fffcaffd640 (LWP 29151)]
[New Thread 0x7fffca7fc640 (LWP 29152)]
[New Thread 0x7fffc9ffb640 (LWP 29153)]
[New Thread 0x7fffc97fa640 (LWP 29154)]
[New Thread 0x7fffc8ff9640 (LWP 29155)]
[New Thread 0x7fffc37fe640 (LWP 29156)]
[New Thread 0x7fffc2ffd640 (LWP 29157)]
[New Thread 0x7fffc27fc640 (LWP 29158)]
[New Thread 0x7fffc1ffb640 (LWP 29159)]
[New Thread 0x7fffc17fa640 (LWP 29160)]
[New Thread 0x7fffc0ff9640 (LWP 29161)]
[New Thread 0x7fff8bfff640 (LWP 29162)]
[New Thread 0x7fff83fff640 (LWP 29163)]
[New Thread 0x7fff8b7fe640 (LWP 29164)]
[New Thread 0x7fff8affd640 (LWP 29165)]
[New Thread 0x7fff8a7fc640 (LWP 29166)]
[New Thread 0x7fff89ffb640 (LWP 29167)]
[New Thread 0x7fff897fa640 (LWP 29168)]
[New Thread 0x7fff88ff9640 (LWP 29169)]
[New Thread 0x7fff837fe640 (LWP 29170)]
[New Thread 0x7fff82ffd640 (LWP 29171)]
[New Thread 0x7fff827fc640 (LWP 29172)]
[New Thread 0x7fff81ffb640 (LWP 29173)]
[New Thread 0x7fff817fa640 (LWP 29174)]
[Thread 0x7fff817fa640 (LWP 29174) exited]
[Thread 0x7fff81ffb640 (LWP 29173) exited]
[New Thread 0x7fff81ffb640 (LWP 29175)]
[New Thread 0x7fff817fa640 (LWP 29176)]
[New Thread 0x7fff52fe6640 (LWP 29177)]
[Detaching after fork from child process 29178]
[New Thread 0x7fff527e5640 (LWP 29215)]
[New Thread 0x7fff51fe4640 (LWP 29216)]
[Thread 0x7fff51fe4640 (LWP 29216) exited]
[Thread 0x7fff527e5640 (LWP 29215) exited]
[Detaching after fork from child process 29217]
[New Thread 0x7fff527e5640 (LWP 29219)]
[New Thread 0x7fff51fe4640 (LWP 29220)]
[New Thread 0x7fff3bfff640 (LWP 29221)]
[New Thread 0x7fff3b7fe640 (LWP 29222)]
[New Thread 0x7fff3affd640 (LWP 29223)]
[New Thread 0x7fff3a7fc640 (LWP 29224)]

Thread 1 "latte-dock" received signal SIGSEGV, Segmentation fault.
0x00007ffff4948cf7 in QtWayland::wl_output::handle_done(void*, wl_output*) ()
from /usr/lib/libQt5WaylandClient.so.5
(gdb) backtrace
#0  0x00007ffff4948cf7 in QtWayland::wl_output::handle_done(void*, wl_output*)
() at /usr/lib/libQt5WaylandClient.so.5
#1  0x00007ffff3d73536 in  () at /usr/lib/libffi.so.8
#2  0x00007ffff3d70037 in  () at /usr/lib/libffi.so.8
#3  0x00007ffff51665e2 in  () at /usr/lib/libwayland-client.so.0
#4  0x00007ffff5166d73 in  () at /usr/lib/libwayland-client.so.0
#5  0x00007ffff5166f8c in wl_display_dispatch_queue_pending () at
/usr/lib/libwayland-client.so.0
#6  0x00007ffff4926586 in QtWaylandClient::QWaylandDisplay::flushRequests() ()
at /usr/lib/libQt5WaylandClient.so.5
#7  0x00007ffff5aa27d6 in QObject::event(QEvent*) () at
/usr/lib/libQt5Core.so.5
#8  0x00007ffff67732c6 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /usr/lib/libQt5Widgets.so.5
#9  0x00007ffff5a7e5aa in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /usr/lib/libQt5Core.so.5
#10 0x00007ffff5a7f0a9 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#11 0x00007ffff5ac6678 in  () at /usr/lib/libQt5Core.so.5
#12 0x00007ffff3ef5163 in g_main_context_dispatch () at
/usr/lib/libglib-2.0.so.0
#13 0x00007ffff3f4b9e9 in  () at /usr/lib/libglib-2.0.so.0
#14 0x00007ffff3ef26c5 in g_main_context_iteration () at
/usr/lib/libglib-2.0.so.0
#15 0x00007ffff5aca57a in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#16 0x00007ffff5a7688b in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#17 0x00007ffff5a81fd7 in QCoreApplication::exec() () at
/usr/lib/libQt5Core.so.5
#18 0x0000555555597b46 in  ()
#19 0x00007ffff52ec290 in  () at /usr/lib/libc.so.6
#20 0x00007ffff52ec34a in __libc_start_main () at /usr/lib/libc.so.6
#21 0x000055555559e99e in _start ()
(gdb)

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