#0  pkgSourceList::~pkgSourceList (this=0x7fffffffd8a0, __in_chrg=<optimized out>) at /usr/include/c++/8/bits/stl_iterator.h:796
#1  0x0000000000407fb1 in DistUpgrade::update (this=0x42f000) at dist_upgrade.cpp:190
#2  0x0000000000408e08 in DistUpgrade::start (this=0x42f000) at dist_upgrade.cpp:400
#3  0x00000000004053e8 in Checker::startProgram (this=0x7fffffffe130) at checker.cpp:34
#4  0x00007ffff7c0bdf2 in QObject::event (this=0x7fffffffe130, e=<optimized out>) at kernel/qobject.cpp:1260
#5  0x00007ffff7be1af6 in doNotify (event=<optimized out>, receiver=<optimized out>) at ../../src/corelib/kernel/qobject.h:142
#6  QCoreApplication::notify (event=<optimized out>, receiver=<optimized out>, this=<optimized out>) at kernel/qcoreapplication.cpp:1160
#7  QCoreApplication::notifyInternal2 (receiver=0x7fffffffe130, event=0x42e2a0) at kernel/qcoreapplication.cpp:1084
#8  0x00007ffff7be4b67 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x429680) at kernel/qcoreapplication.cpp:1821
#9  0x00007ffff7c35bd3 in postEventSourceDispatch (s=0x4309b0) at kernel/qeventdispatcher_glib.cpp:276
#10 0x00007ffff6e2973e in g_main_dispatch (context=0x42e700) at ../glib/gmain.c:3189
#11 g_main_context_dispatch (context=context@entry=0x42e700) at ../glib/gmain.c:3854
#12 0x00007ffff6e299d8 in g_main_context_iterate (context=context@entry=0x42e700, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:3927
#13 0x00007ffff6e29a6c in g_main_context_iteration (context=0x42e700, may_block=may_block@entry=1) at ../glib/gmain.c:3988
#14 0x00007ffff7c351e3 in QEventDispatcherGlib::processEvents (this=0x42dd70, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#15 0x00007ffff7be071b in QEventLoop::exec (this=this@entry=0x7fffffffe050, flags=..., flags@entry=...) at ../../src/corelib/global/qflags.h:140
#16 0x00007ffff7be8702 in QCoreApplication::exec () at ../../src/corelib/global/qflags.h:120
#17 0x0000000000404d22 in main (argc=<optimized out>, argv=<optimized out>) at main.cpp:47