#0  0x00007ffff68949dc in __pthread_kill_implementation () from /lib64/libc.so.6
#1  0x00007ffff6841176 in raise () from /lib64/libc.so.6
#2  0x00007ffff6828917 in abort () from /lib64/libc.so.6
#3  0x00007ffff6cb0213 in ?? () from /lib64/libstdc++.so.6
#4  0x0000000000406432 in __gnu_debug::_Safe_iterator<std::_Rb_tree_const_iterator<std::pair<int const, QtPrivate::ResultItem> >, std::__debug::map<int, QtPrivate::ResultItem, std::less<int>, std::allocator<std::pair<int const, QtPrivate::ResultItem> > >, std::forward_iterator_tag>::operator-> (this=0x7ffff40099d0) at /usr/include/c++/13/debug/safe_iterator.h:312
#5  __gnu_debug::_Safe_iterator<std::_Rb_tree_const_iterator<std::pair<int const, QtPrivate::ResultItem> >, std::__debug::map<int, QtPrivate::ResultItem, std::less<int>, std::allocator<std::pair<int const, QtPrivate::ResultItem> > >, std::forward_iterator_tag>::operator-> (this=0x7ffff40099d0) at /usr/include/c++/13/debug/safe_iterator.h:310
#6  QMap<int, QtPrivate::ResultItem>::const_iterator::value (this=0x7ffff40099d0) at /usr/include/qt6/QtCore/qmap.h:513
#7  QtPrivate::ResultIteratorBase::pointer<int> (this=0x7ffff40099d0) at /usr/include/qt6/QtCore/qresultstore.h:81
#8  QtPrivate::ResultIteratorBase::pointer<int> (this=0x7ffff40099d0) at /usr/include/qt6/QtCore/qresultstore.h:74
#9  QtPrivate::ResultIteratorBase::value<int> (this=0x7ffff40099d0) at /usr/include/qt6/QtCore/qresultstore.h:68
#10 QFutureInterface<int>::resultReference (this=<optimized out>, index=<optimized out>) at /usr/include/qt6/QtCore/qfutureinterface.h:388
#11 0x0000000000407e0b in QFuture<int>::result<int, void> (this=0x503000001460) at /usr/include/qt6/QtCore/qfuture.h:308
#12 QFutureWatcher<int>::result<int, void> (this=0x503000001450) at /usr/include/qt6/QtCore/qfuturewatcher.h:113
#13 MyObj::start()::{lambda()#1}::operator()() const (__closure=__closure@entry=0x5030000014c0) at demo2.cpp:24
#14 0x000000000040816f in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, MyObj::start()::{lambda()#1}>::call(MyObj::start()::{lambda()#1}&, void**) (arg=0x7fffffffd0a8, f=...) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:136
#15 QtPrivate::FunctorCallable<MyObj::start()::{lambda()#1}>::call<QtPrivate::List<>, void>(MyObj::start()::{lambda()#1}&, void*, void**) (arg=0x7fffffffd0a8, f=...) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:345
#16 QtPrivate::QCallableObject<MyObj::start()::{lambda()#1}, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1, this_=0x5030000014b0, r=<optimized out>, a=0x7fffffffd0a8, ret=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:555
#17 0x00007ffff71e8130 in ?? () from /lib64/libQt6Core.so.6
#18 0x00007ffff72f98d8 in QFutureWatcherBase::event(QEvent*) () from /lib64/libQt6Core.so.6
#19 0x00007ffff718edff in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt6Core.so.6
#20 0x00007ffff718f180 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt6Core.so.6
#21 0x00007ffff73c2973 in ?? () from /lib64/libQt6Core.so.6
#22 0x00007ffff6f12740 in ?? () from /lib64/libglib-2.0.so.0
#23 0x00007ffff6f14388 in ?? () from /lib64/libglib-2.0.so.0
#24 0x00007ffff6f14a3c in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#25 0x00007ffff73c147c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt6Core.so.6
#26 0x00007ffff719959b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt6Core.so.6
#27 0x00007ffff7192da6 in QCoreApplication::exec() () from /lib64/libQt6Core.so.6
#28 0x0000000000404b81 in main (argc=<optimized out>, argv=<optimized out>) at demo2.cpp:49