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@natoscott, hardware issue is unlikely as we're talking about VMs hanging when pmcd runs and numerous physical machines exhibiting off behavior like hanging on shutdown. I agree on the kernel being a likely source of the problem as this is indeed a kernel crash. pmcd is somehow triggering it. After much fighting I have been able to get kdump working and I have crash dumps of the problem. One of them is here: https://drive.google.com/open?id=0B6emnuNXtougZmhGSWhrS2ZJZVU I also have this poorly made screencast demonstrating the behavior by simply starting pmcd: I'm not much of a kernel engineer so I'm of limited help at this point. — |