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ERROR_VID_QUEUE_FULL
ERROR_VID_QUEUE_FULL is HRESULT 0xC0370003 in the VID message queue backpressure area of the Windows virtualization stack. It applies to a host-side VID message queue that cannot accept another item.
Object lifecycle behind the result
Producers have outrun consumption or the consumer is blocked, stopped, or unable to acknowledge work. Queue depth and oldest-item age are more useful than generic CPU or network checks.
Neighboring result: MESSAGE_QUEUE_CLOSED is a lifecycle end state; QUEUE_FULL means the queue still exists but has no capacity for the new message.
Diagnostic evidence matrix
| Evidence | Why it changes the diagnosis |
|---|---|
| Queue identity | Record partition, queue name/handle, producer, and consumer. |
| Depth timeline | Capture capacity, current depth, oldest item age, enqueue rate, and dequeue rate. |
| Consumer state | Keep thread wait reason, VP/worker state, and the last successfully processed message. |
| Backpressure policy | Record retry, drop, coalescing, and acknowledgement behavior. |
Test one variable at a time
- Pause producers in a controlled test and verify whether the queue drains.
- Inspect the oldest unconsumed message before clearing the queue.
- Bound retries and preserve ordering for stateful messages.
- Test consumer failure and restart without losing queue ownership.
Reproduce this condition with bounded producers and a fully instrumented consumer. Preserve message ordering, queue generation, handler ownership, target VP, and acknowledgement timestamps while changing only one concurrency condition.
How to read the controls
| Control | Interpretation | Hold constant |
|---|---|---|
| Single producer and consumer | If it disappears with serialized ownership, the queue, handler, acknowledgement, or delivery race is implicated. | Preserve message type, partition, target VP, and queue capacity. |
| Fresh channel generation | A new queue or handler generation changing it points to stale registration, backlog, or incomplete teardown. | Keep payload, producer order, and host build unchanged in the test. |
| Controlled stall or burst | Deliberately slow the consumer or bound the producer rate. The threshold at which it appears identifies backpressure versus lifecycle failure. | Record queue depth, oldest-item age, and acknowledgement timing. |
Scope of this status
Regression proof
The repair maintains bounded queue latency under expected peak load and recovers cleanly after a deliberately stalled consumer.
Technical references
- Microsoft Open Specifications: HRESULT values — used to interpret this result.
- Microsoft TLFS: inter-partition communication — used to interpret this result.
- Microsoft TLFS: HV_MESSAGE — used to interpret this result.
- Microsoft: Hyper-V architecture — used to interpret this result.
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