I get this occasionally when running the Qml tests:
#0 0x00002aaac48ba65b in QListData::size (this=0x741588) at /usr/include/qt5/QtCore/qlist.h:92
#1 0x00002aaac48c521f in QList<OxideQOutgoingMessageRequestBase*>::indexOf (this=0x741588, t=@0x7fffffffd060: 0x710aa0, from=0) at /usr/include/qt5/QtCore/qlist.h:857
#2 0x00002aaac48c4eb2 in QList<OxideQOutgoingMessageRequestBase*>::removeOne (this=0x741588, _t=@0x7fffffffd060: 0x710aa0) at /usr/include/qt5/QtCore/qlist.h:804
#3 0x00002aaac48c47d3 in oxide::qt::QWebFrameBasePrivate::removeOutgoingMessageRequest (this=0x741570, request=0x710aa0) at qt/lib/api/oxide_qt_qweb_frame_p.cc:50
#4 0x00002aaac48c3b14 in oxide::qt::QOutgoingMessageRequestBasePrivate::~QOutgoingMessageRequestBasePrivate (this=0x73e730, __in_chrg=<optimised out>)
at qt/lib/api/oxide_qt_qoutgoing_message_request_p.cc:55
#5 0x00002aaac48c4586 in oxide::qt::QQuickOutgoingMessageRequestPrivate::~QQuickOutgoingMessageRequestPrivate (this=0x73e730, __in_chrg=<optimised out>)
at qt/lib/api/oxide_qt_qoutgoing_message_request_p.h:74
#6 0x00002aaac48c45b6 in oxide::qt::QQuickOutgoingMessageRequestPrivate::~QQuickOutgoingMessageRequestPrivate (this=0x73e730, __in_chrg=<optimised out>)
at qt/lib/api/oxide_qt_qoutgoing_message_request_p.h:74
#7 0x00002aaac48feca0 in QScopedPointerDeleter<oxide::qt::QOutgoingMessageRequestBasePrivate>::cleanup (pointer=0x73e730) at /usr/include/qt5/QtCore/qscopedpointer.h:63
#8 0x00002aaac48fec69 in QScopedPointer<oxide::qt::QOutgoingMessageRequestBasePrivate, QScopedPointerDeleter<oxide::qt::QOutgoingMessageRequestBasePrivate> >::~QScopedPointer (
this=0x710ab0, __in_chrg=<optimised out>) at /usr/include/qt5/QtCore/qscopedpointer.h:99
#9 0x00002aaac48fe8d2 in OxideQOutgoingMessageRequestBase::~OxideQOutgoingMessageRequestBase (this=0x710aa0, __in_chrg=<optimised out>)
at qt/lib/api/public/oxide_qt_qoutgoing_message_request.cc:29
#10 0x00002aaac48fe984 in OxideQQuickOutgoingMessageRequest::~OxideQQuickOutgoingMessageRequest (this=0x710aa0, __in_chrg=<optimised out>)
at qt/lib/api/public/oxide_qt_qoutgoing_message_request.cc:35
#11 0x00002aaac48fe9b4 in OxideQQuickOutgoingMessageRequest::~OxideQQuickOutgoingMessageRequest (this=0x710aa0, __in_chrg=<optimised out>)
at qt/lib/api/public/oxide_qt_qoutgoing_message_request.cc:35
#12 0x00002aaaacd8ac9d in QV8QObjectWrapper::deleteWeakQObject(QV8QObjectResource*, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00002aaaacd8aed4 in QV8QObjectWrapper::destroy() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#14 0x00002aaaacd76e1d in QV8Engine::~QV8Engine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#15 0x00002aaaacd772b9 in QV8Engine::~QV8Engine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#16 0x00002aaaacd68361 in QJSEngine::~QJSEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#17 0x00002aaaacc75e5d in QQmlEngine::~QQmlEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#18 0x00002aaaacc75f19 in QQmlEngine::~QQmlEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#19 0x00002aaaac2aec1c in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00002aaaac2b5a02 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00002aaaabb80fb7 in QWindow::~QWindow() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#22 0x00002aaaac88ac79 in QQuickView::~QQuickView() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#23 0x00002aaaaacdbd7b in quick_test_main(int, char**, char const*, char const*) () from /usr/lib/x86_64-linux-gnu/libQt5QuickTest.so.5
#24 0x00002aaaaaf0bde5 in __libc_start_main (main=0x4005e0 <main(int, char**)>, argc=3, ubp_av=0x7fffffffd6c8, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised o
ut>,
stack_end=0x7fffffffd6b8) at libc-start.c:260
#25 0x000000000040061c in _start ()
