I'm planning to write a post for debugging Bug Check 0x101 issue (CLOCK_WATCHDOG_TIMEOUT) in Windows system. but I happened to find this blog Debugging a CLOCK_WATCHDOG_TIMEOUT Bugcheck from MSFT debugger team which explaned it in greater details. However, the issue we met is slightly different from what MSFT team was debugging. We are working in virtualization/hypervisor environment, and Windows (7+) is running as a primary Guest OS.