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ERROR_VID_KM_INTERFACE_ALREADY_INITIALIZED
ERROR_VID_KM_INTERFACE_ALREADY_INITIALIZED is HRESULT 0xC037001F in the VID kernel-mode interface initialization area of the Windows virtualization stack. It applies to initialization of a kernel-mode VID interface that is already active for the caller or generation.
State and ownership model
Initialization ran twice without the matching uninitialization, or multiple paths believe they own the interface. Preserve the first successful initializer and failure rollback sequence.
Neighboring result: EXCEEDED_KM_CONTEXT_COUNT_LIMIT is aggregate capacity; ALREADY_INITIALIZED is duplicate state for an interface instance.
Capture before changing anything
| Evidence | Why it changes the diagnosis |
|---|---|
| Interface instance | Record driver/module, device object, partition context, and generation. |
| First initialization | Keep stack, flags, and success timestamp. |
| Second caller | Capture duplicate path and trigger. |
| Uninitialize path | Record whether prior failure skipped cleanup or unload was incomplete. |
Reduce the case safely
- Centralize initialization ownership and publish readiness once.
- Make rollback distinguish never-initialized from successfully initialized.
- Test driver reload and power/VM lifecycle paths.
- Do not suppress the result unless the existing interface identity is proven equivalent.
What comparison can tell you
| Control | Interpretation | Hold constant |
|---|---|---|
| Fresh owned object | A clean lifecycle changing this result implicates duplicate initialization, leaked ownership, stale lookup, or incomplete rollback. | Preserve request flags and topology while changing only object instance. |
| Same request on a compatible host | If it follows one host, compare resource limits, topology, build, and inventory before altering VM data. | Use the same request and leave virtual disks unchanged in the result comparison. |
| One operation parameter | Change one count, name, identity, or state transition. If it moves, the selected condition is causal rather than the VM as a whole. | Keep host build, VM ID, and returning operation fixed. |
Do not erase the evidence
Closure criteria
Each interface generation initializes and uninitializes exactly once across normal and injected-failure paths.
Technical references
- Microsoft Open Specifications: HRESULT values — used to interpret this result.
- Microsoft: Hyper-V architecture — used to interpret this result.
- Microsoft: Hyper-V TLFS — used to interpret this result.
- Microsoft: Hyper-V operational troubleshooting — used to interpret this result.
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