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You can generally not conclude the reason for a system crash by analyzing errors that are most likely follow up symptoms. If the history of the /var/log/messages syslog file does not provide any real clues and the machine has reset instantaneously, then the machine most likely reset due to an external problem. External problems can be associated with power failure, hardware, firmware or heat issue, or problem with your VM solution. The kernel provides mechanism to further analyze a system crash, e.g. Kdump, but then it depends on the source of the issue. I'm afraid the possibilities and options to troubleshoot are far to complex to be discussed here. As far as I'm aware, there is no usable information in your post that can pinpoint the problem.