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ERROR_VID_EXCEEDED_KM_CONTEXT_COUNT_LIMIT
ERROR_VID_EXCEEDED_KM_CONTEXT_COUNT_LIMIT is HRESULT 0xC037001E in the VID kernel-mode client context capacity area of the Windows virtualization stack. The built-in message names the immediate result; the useful custom context is the exact boundary: the number of kernel-mode client contexts attached to the VID interface. Record the first returning operation and host-side event before a management layer retries or translates it.
Locate the failing boundary
The host reached the context limit. Determine whether the intended software scale is unsupported or whether clients fail to close contexts after VM/device/driver lifecycles.
Hyper-V architecture documentation identifies VID as the component that provides partition, virtual-processor, and memory-management services., many ERROR_VID_* values describe internal host objects rather than a public API that administrators should call directly. Accordingly, diagnose this result through the named object/state, the VMMS or Worker event chain, and the operation that produced it; do not invent a user-mode VID call from the constant name.
Neighboring result: KM_INTERFACE_ALREADY_INITIALIZED concerns duplicate initialization of one interface; CONTEXT_COUNT_LIMIT concerns aggregate active kernel clients.
Build an incident record
| Evidence | Why it changes the diagnosis |
|---|---|
| Context inventory | Count active contexts by driver/module, partition, and generation. |
| Open/close balance | Keep successful initialize/open and close/uninitialize totals. |
| Scale trigger | Record VM/device count and the exact client that fails. |
| Driver lifecycle | Note update, unload failure, crash recovery, or repeated initialization. |
Preserve identifiers and counts without dumping guest secrets or unrelated memory. Useful this result timestamps include the last successful operation, first failure, any automatic retry, and the object-generation change that followed.
Run narrow checks
- Exercise driver start/stop and VM create/delete while tracking context count.
- Close contexts on every partial-initialization failure.
- Avoid one context per transient operation when a documented shared lifetime is intended.
- Collect kernel/Hyper-V traces before reboot.
Test the smallest supported create, lookup, initialize, or resource request that preserves the named condition. In the result reproduction, change one count, identity, or lifecycle step at a time and capture the first host event before retry.
Interpret three controls
Across these controls for it, preserve the number of kernel-mode client contexts attached to the VID interface as the boundary under test.
| Control | Interpretation | Hold constant |
|---|---|---|
| Fresh owned object — this result | 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 generation. |
| Same request on a compatible host — it | 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 — it | Change one count, name, identity, or state transition. If it moves, the selected boundary is causal rather than the VM as a whole. | Keep host build, VM ID, and returning operation fixed for it. |
Keep neighboring states separate
A restart may release internal objects and make it disappear while erasing registration, ownership, resource-count, or teardown evidence. Capture the first result event chain before recovery.
Prove the correction
Active contexts stabilize at the expected topology and return to baseline after all clients stop. Repeat the original operation under the original supported conditions and retain one deliberate negative control. A management command succeeding on a different object is not sufficient to close this incident.
Technical references
These sources define it and the public Hyper-V architecture surrounding the internal state. They do not create a public user-mode VID API for the named object.
- Microsoft Open Specifications: HRESULT values — used to interpret the boundary.
- Microsoft: Hyper-V architecture — used to interpret the boundary.
- Microsoft: Hyper-V TLFS — used to interpret the boundary.
- Microsoft: Hyper-V operational troubleshooting — used to interpret the boundary.
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