Fix shim crash when cleaning up process-isolated containers #752
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The issue was observed while experimenting with Buildkit for Windows against containerd, and getting a 'ttrpc closed' error after the layer had completed its task successfully.
The null ptr access in
vm.DeleteContainerStateSupported
was killing the thread it was on, and hence the channel back to containerd was never given an answer before the shim cleaned up the container and terminated.