https://bugs.kde.org/show_bug.cgi?id=469949
--- Comment #1 from grzegorz.ha...@gmail.com ---
(gdb) bt
#0 pw_stream_queue_buffer (stream=0x559786591870, buffer=0x559786591d00) at
../src/pipewire/stream.c:2354
#1 0x00005597826bcca0 in KWin::ScreenCastStream::enqueue()
(this=0x5597864ef460) at
/usr/src/debug/kwin-5.27.4.1-1.fc38.x86_64/src/plugins/screencast/screencaststream.cpp:653
#2 0x00007f7ffb2e8651 in QtPrivate::QSlotObjectBase::call(QObject*, void**)
(a=0x7fff38d5adb0, r=<optimized out>, this=0x55978636e2e0) at
../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#3 doActivate<false>(QObject*, int, void**) (sender=0x5597864aa9b0,
signal_index=3, argv=0x7fff38d5adb0) at kernel/qobject.cpp:3923
#4 0x00007f7ffb2e34d7 in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**)
(sender=sender@entry=0x5597864aa9b0, m=m@entry=0x7f7ffb566420
<QSocketNotifier::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff38d5adb0)
at kernel/qobject.cpp:3983
#5 0x00007f7ffb2eb05d in QSocketNotifier::activated(QSocketDescriptor,
QSocketNotifier::Type, QSocketNotifier::QPrivateSignal)
(this=this@entry=0x5597864aa9b0, _t1=..., _t2=<optimized out>, _t3=...) at
.moc/moc_qsocketnotifier.cpp:178
#6 0x00007f7ffb2eb8cb in QSocketNotifier::event(QEvent*) (this=0x5597864aa9b0,
e=<optimized out>) at kernel/qsocketnotifier.cpp:302
#7 0x00007f7ffa9aeb75 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
(this=<optimized out>, receiver=0x5597864aa9b0, e=0x7fff38d5aec0) at
kernel/qapplication.cpp:3640
#8 0x00007f7ffb2b3d48 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
(receiver=0x5597864aa9b0, event=0x7fff38d5aec0) at
kernel/qcoreapplication.cpp:1064
#9 0x00007f7ffb2b3f62 in QCoreApplication::sendEvent(QObject*, QEvent*)
(receiver=<optimized out>, event=<optimized out>) at
kernel/qcoreapplication.cpp:1462
#10 0x00007f7ffb3039cf in
QEventDispatcherUNIXPrivate::activateSocketNotifiers()
(this=this@entry=0x559784460a30) at kernel/qeventdispatcher_unix.cpp:304
#11 0x00007f7ffb303d50 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:511
#12 0x0000559782778232 in
QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
()
#13 0x00007f7ffb2b270b in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7fff38d5b060, flags=..., flags@entry=...) at
../../include/QtCore/../../src/corelib/global/qflags.h:69
#14 0x00007f7ffb2ba99b in QCoreApplication::exec() () at
../../include/QtCore/../../src/corelib/global/qflags.h:121
#15 0x00007f7ffb7606bd in QGuiApplication::exec() () at
kernel/qguiapplication.cpp:1863
#16 0x00007f7ffa9aeae9 in QApplication::exec() () at
kernel/qapplication.cpp:2832
#17 0x0000559782692d64 in main(int, char**) (argc=<optimized out>,
argv=<optimized out>) at
/usr/src/debug/kwin-5.27.4.1-1.fc38.x86_64/src/main_wayland.cpp:628
(gdb) p *stream
$1 = {core = 0x5597865bd490, core_listener = {link = {next = 0x5597865bd4e8,
prev = 0x5597861236d8}, cb = {funcs = 0x7f7ffaffc700 <core_events.lto_priv>,
data = 0x559786591870}, removed = 0x0, priv = 0x0}, link = {
next = 0x5597865bd5c8, prev = 0x5597865bd5c8}, name = 0x5597860e4fe0
"kwin-screencast-org.kde.konsole", properties = 0x5597863dbd80, node_id = 167,
state = PW_STREAM_STATE_PAUSED, error = 0x0, listener_list = {list = {
next = 0x5597864ef498, prev = 0x5597864ef498}}, proxy = 0x55978655bc20,
proxy_listener = {link = {next = 0x55978655bc68, prev = 0x55978655bd60}, cb =
{funcs = 0x7f7ffaffd1e0 <proxy_events>, data = 0x559786591870}, removed = 0x0,
priv = 0x0}, node_listener = {link = {next = 0x55978655a480, prev =
0x55978655bcf0}, cb = {funcs = 0x7f7ffaffd140 <node_events>, data =
0x559786591870}, removed = 0x0, priv = 0x0}, controls = {next = 0x559786591950,
prev = 0x559786591950}}
(gdb) list
2349 struct stream *impl = SPA_CONTAINER_OF(stream, struct stream,
this);
2350 struct buffer *b = SPA_CONTAINER_OF(buffer, struct buffer,
this);
2351 int res;
2352
2353 if (b->busy)
2354 ATOMIC_DEC(b->busy->count);
2355
2356 pw_log_trace_fp("%p: queue buffer %d", stream, b->id);
2357 if ((res = queue_push(impl, &impl->queued, b)) < 0)
2358 return res;
(gdb) p b->busy
$4 = (struct spa_meta_busy *) 0x7f7f8bb09240
(gdb) p b->busy->count
Cannot access memory at address 0x7f7f8bb09244
Maybe this is similar issue to
https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3040
The status of stream passed to pw_stream_queue_buffer() is
PW_STREAM_STATE_PAUSED
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