Deadlock when loading states via scripts

[malleoz]

The following sample script will generate freezes when running the script

from dolphin import savestate
from Modules import mkw_utils

@event.on_frameadvance
def frame():
    frameCount = mkw_utils.frame_of_input()

    if (frameCount % 10 == 0):
        savestate.load_from_slot(0)

This is the blocking callstack:

1      [External Code] 
2      DolphinD.exe!PyScripting::PyEvent<std::tuple<bool,unsigned int> const (__cdecl*)(API::Events::SaveStateLoad const &),&PyScripting::PySaveStateLoad>::GetListener::__l2::<lambda_1>::operator()(const API::Events::SaveStateLoad & event) 
3      DolphinD.exe!std::invoke<`PyScripting::PyEvent<std::tuple<bool,unsigned int> const (__cdecl*)(API::Events::SaveStateLoad const &),&PyScripting::PySaveStateLoad>::GetListener'::`2'::<lambda_1> &,API::Events::SaveStateLoad const &>(PyScripting::PyEvent<std::tuple<bool,unsigned int> const (__cdecl*)(API::Events::SaveStateLoad const &),&PyScripting::PySaveStateLoad>::GetListener::__l2::<lambda_1> & _Obj, const API::Events::SaveStateLoad & _Arg1) 
4      DolphinD.exe!std::_Func_impl_no_alloc<`PyScripting::PyEvent<std::tuple<bool,unsigned int> const (__cdecl*)(API::Events::SaveStateLoad const &),&PyScripting::PySaveStateLoad>::GetListener'::`2'::<lambda_1>,void,API::Events::SaveStateLoad const &>::_Do_call(const API::Events::SaveStateLoad & <_Args_0>) 
5      DolphinD.exe!std::_Func_class<void,API::Events::SaveStateLoad const &>::operator()(const API::Events::SaveStateLoad & <_Args_0>) 
6      DolphinD.exe!API::EventContainer<API::Events::SaveStateLoad>::EmitEvent(API::Events::SaveStateLoad evt) 
7      DolphinD.exe!API::GenericEventHub<API::Events::FrameAdvance,API::Events::FrameDrawn,API::Events::MemoryBreakpoint,API::Events::CodeBreakpoint,API::Events::SetInterrupt,API::Events::ClearInterrupt,API::Events::SaveStateSave,API::Events::SaveStateLoad>::EmitEvent<API::Events::SaveStateLoad>(API::Events::SaveStateLoad evt) 
8      DolphinD.exe!State::Load(int slot) 
9      DolphinD.exe!PyScripting::LoadFromSlot(_object * self, _object * args) 
10     [External Code] 
11     DolphinD.exe!Py::CallFunction<>(const Py::Object & callable_object) 
12     DolphinD.exe!`PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::Listener'::`2'::<lambda_1>::operator()<>() 
13     DolphinD.exe!std::invoke<`PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::Listener'::`2'::<lambda_1>>(PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::Listener::__l2::<lambda_1> && _Obj) 
14     DolphinD.exe!std::_Apply_impl<`PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::Listener'::`2'::<lambda_1>,std::tuple<> const &>(PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::Listener::__l2::<lambda_1> && _Obj, const std::tuple<> & _Tpl, std::integer_sequence<unsigned __int64> __formal) 
15     DolphinD.exe!std::apply<`PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::Listener'::`2'::<lambda_1>,std::tuple<> const &>(PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::Listener::__l2::<lambda_1> && _Obj, const std::tuple<> & _Tpl) 
16     DolphinD.exe!PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::Listener(const Py::Object module, const API::Events::FrameAdvance & event) 
17     DolphinD.exe!PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::GetListener::__l2::<lambda_1>::operator()(const API::Events::FrameAdvance & event) 
18     DolphinD.exe!std::invoke<`PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::GetListener'::`2'::<lambda_1> &,API::Events::FrameAdvance const &>(PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::GetListener::__l2::<lambda_1> & _Obj, const API::Events::FrameAdvance & _Arg1) 
19     DolphinD.exe!std::_Func_impl_no_alloc<`PyScripting::PyEvent<std::tuple<> const (__cdecl*)(API::Events::FrameAdvance const &),&PyScripting::PyFrameAdvance>::GetListener'::`2'::<lambda_1>,void,API::Events::FrameAdvance const &>::_Do_call(const API::Events::FrameAdvance & <_Args_0>) 
20     DolphinD.exe!std::_Func_class<void,API::Events::FrameAdvance const &>::operator()(const API::Events::FrameAdvance & <_Args_0>) 
21     DolphinD.exe!API::EventContainer<API::Events::FrameAdvance>::EmitEvent(API::Events::FrameAdvance evt) 
22     DolphinD.exe!API::GenericEventHub<API::Events::FrameAdvance,API::Events::FrameDrawn,API::Events::MemoryBreakpoint,API::Events::CodeBreakpoint,API::Events::SetInterrupt,API::Events::ClearInterrupt,API::Events::SaveStateSave,API::Events::SaveStateLoad>::EmitEvent<API::Events::FrameAdvance>(API::Events::FrameAdvance evt) 
23     DolphinD.exe!PatchEngine::ApplyFramePatches() 
24     DolphinD.exe!SystemTimers::`anonymous namespace'::PatchEngineCallback(Core::System & system, unsigned __int64 userdata, __int64 cycles_late) 
25     DolphinD.exe!CoreTiming::CoreTimingManager::Advance() 
26     DolphinD.exe!CoreTiming::GlobalAdvance() 
27     [External Code] 
28     DolphinD.exe!BitField<4,1,unsigned int,unsigned int>::Value(std::integral_constant<bool,0> __formal)