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HYPERVISOR_WATCHDOG_TIMEOUT
Hypervisor watchdog timeout
HYPERVISOR_WATCHDOG_TIMEOUT is bug check code 0x000001CA. The built-in table identifies it as HYPERVISOR_WATCHDOG_TIMEOUT
; the useful diagnostic question is what Windows component raised the stop and which invariant failed.
This code belongs to the Hyper-V/Windows hypervisor layer. It indicates a watchdog timeout in hypervisor execution rather than an ordinary guest driver timeout.
How to read the parameters
- The dump should be examined with hypervisor flags, virtualization enlightenment state, and processor context in mind.
- It can be influenced by firmware, CPU virtualization features, nested virtualization, or host/guest scheduling.
- Do not treat it the same as CLOCK_WATCHDOG_TIMEOUT unless the processor evidence supports that path.
What to check in the dump
- Check Hyper-V state, VBS, nested virtualization, firmware/microcode, CPU errata, and hypervisor-related event logs.
- For virtual machines, collect host-side logs as well as the guest dump.
- If VBS or Credential Guard is enabled, include that configuration in the report.
References
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