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MEM_E_INVALID_SIZE
A productive investigation starts at OLE allocation request size. The status means that the storage or allocator rejected a requested block/stream allocation because the size exceeds its representable or supported range.
Start with the failing layer
Structured-storage failures are best investigated on a byte-for-byte copy. Sector ownership, FAT or miniFAT links, stream sizes, commit state, and the file hash belong in the same record; opening and resaving the only copy can destroy the allocation pattern that identifies the writer defect.
Do not collapse this result into a nearby status. E_OUTOFMEMORY can occur for an otherwise valid size; MEM_E_INVALID_SIZE means the requested size itself is outside the accepted contract. Compare lifecycle, identity, caller, and first API.
Preserve before retrying
| Incident evidence | Question it answers |
|---|---|
| Requested byte count before narrowing or alignment | Tests whether the first boundary moves. |
| Integer type, multiplication/addition operands, sector rounding, and overflow checks | Pins evidence to one attempt. |
| Storage format limits and current stream/store size | Separates contract failure from environment. |
| Whether the request comes from corrupt metadata or legitimate unusually large input | Creates a stable before/after control. |
The goal is reproducibility, not a full data dump. Prefer object IDs, configuration exports, event correlation, and redacted paths over credentials, cryptographic material, or user content.
Three useful comparisons
- Reproduce with values immediately below and above the documented limit; retain one negative control so that a broad workaround is not mistaken for a root-cause correction.
- Perform checked arithmetic in the caller and log the pre-alignment size; keep every other input fixed and record the first event that differs from the failing run.
- Test the same logical data with chunked writes if the interface supports them; use a disposable or backed-up environment when the comparison changes boot, security, device, queue, or encryption state.
Do not use repeated retries as the primary test. In this case, a successful later attempt may reflect a new object, refreshed policy, restarted service, different token, or completed background transition, so record exactly what changed between attempts.
Decision points
Interpret the controlled tests as evidence about the returning boundary:
| Observed result | Interpretation |
|---|---|
| The minimal or known-good comparison succeeds | The control works; inspect production-specific state. |
| The control fails at the same first operation | The control also fails; inspect host/provider evidence. |
| A new HRESULT marks another boundary | this boundary moved; diagnose the new status separately rather than treating it as confirmation that the entire operation is fixed. |
A defensible fix
Apply the smallest change that addresses the first rejected condition: Validate arithmetic and format limits before allocation, reject corrupt length fields, or split the operation without changing data ordering. Preserve the pre-change configuration or trace.
Close the incident only when boundary tests pass at the maximum supported size, fail cleanly above it, and never wrap to a smaller allocation. Repeat under the original identity and state. A different environment is comparison, not proof.
Technical references
The diagnostic boundaries above are grounded in the following Microsoft specifications and API documentation:
- Microsoft Open Specifications: HRESULT values.
- Microsoft: Structured Storage.
- Microsoft: IStorage.
- Microsoft: IStream.
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