I examined a bit more on the rare hanging when saving state.
One message loop that may never quite is
VBoxClipboardThread():
MSG msg;
while (GetMessage(&msg, NULL, 0, 0) && !pCtx->fTerminate)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
the above while loops depends pCtx->fTerminate to quit, however, GetMessage()
may goes to sleep, so never gets to check fTerminate.
The window proc has WM_CLOSE handler, but does nothing, needs to add something
like PostQuitMessage(0), which cause GetMessage() to quit.
There might be some other places that have similar problems.
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