At last, we have a description of the mysterious shutdown-blocking G — and a fix for Microsoft’s G-generating bug coming in the next version of Win10, commonly called 20H1.
If you look online, you’ll see hundreds (if not thousands) of reports about Win10 shutdown getting blocked by a mysterious app called, simply, G.
Most people assume it’s a virus, some other sort of malware or a harbinger of doom. In fact, it’s nothing of the sort. It’s a bug in the way Windows reports a specific kind of hang, and the bug has been fixed in the latest versions of Win10 20H1.