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RO_E_BLOCKED_CROSS_ASTA_CALL
Deadlock-prone cross-ASTA call was blocked
RO_E_BLOCKED_CROSS_ASTA_CALL is HRESULT 2147483679 (0x8000001F) from winerror.h. AllStat describes it as “A COM call to an ASTA was blocked because the call chain originated in or passed through another ASTA; This call pattern is deadlock-prone and disallowed by apartment call control.” In the Windows Runtime metadata, object lifetime, asynchronous operation, activation, and apartment model, the code identifies a specific failure boundary and should not be replaced by a generic COM exception.
Handling this result correctly requires the code-specific postcondition, not merely the fact that FAILED(hr) is true.
Where it is encountered
- C++/WinRT, WRL,.NET projections, or native WinRT ABI calls. Record the interface, method, component version, thread, apartment, process, and correlation ID.
- Runtime-class activation, WinMD reflection, asynchronous objects, observable state, or view lifecycle.
- Cross-thread and cross-apartment handoff between UI, ASTA, STA, MTA, broker, and background work.
The immediate focus for it is a synchronous COM call chain that originates in or passes through an application STA and attempts a prohibited call into another ASTA. Keep it attached to that operation; the same numeric severity outside the owning API does not supply enough context.
Decisive interpretation boundary
Before choosing recovery, verify that the complete apartment call chain, synchronous waits, reentrancy points, and dispatcher ownership are captured. Validate this condition for it using the owning API state, not an inferred UI symptom.
Also confirm that all observed objects, tokens, buffers, proxies, metadata files, or ACLs belong to the current operation generation and were not retained from an earlier attempt.
Correct handling and recovery
Break the synchronous chain with an async boundary, marshal work to the owning dispatcher, and avoid blocking an ASTA while another apartment must call back.
Backoff alone is not a repair for it; a measurable state or configuration transition must justify another attempt.
Lifetime, retry, and cleanup rules
After it, determine whether the current object, interface pointer, call context, token, stream, metadata reader, asynchronous operation, or access-control instance remains valid. Release only resources owned by the failing attempt, cancel callbacks through their documented mechanism, and avoid double close, double commit, repeated activation, or replay of a non-idempotent remote method.
The retry policy for it should state the trigger, maximum attempts, cancellation owner, and reconciliation step for effects that may have completed elsewhere.
Practical scenario
An ASTA handler synchronously waits on a broker that calls a second ASTA. The workflow becomes asynchronous and resumes on the original dispatcher after broker completion.
A regression test should reproduce it, assert the raw HRESULT and all relevant outputs, then correct only the decisive condition and verify the intended success or neighboring failure result.
Difference from nearby HRESULTs
It is deliberate deadlock prevention; RPC_E_CANTCALLOUT_ININPUTSYNCCALL blocks a different reentrant call pattern during input-synchronous dispatch.
A support tool discussing it should name the neighboring result only after the originating API and decisive state are known.
Developer and administrator guidance
Dashboards should classify it by its actual cause category—lifetime, timing, apartment, marshaling, identity, authorization, format, buffer, or storage—rather than grouping every COM failure under one counter.
Document the owner of the boundary so future occurrences can be correlated across client, proxy, server, package, and security logs. Define who owns retry, cancellation, cleanup, policy changes, package repair, and user-facing messaging for it.
References
- Microsoft: C++/WinRT error handling
- Microsoft: concurrency and asynchronous operations
- Microsoft: WinMD files
- Microsoft: IAgileObject
- Microsoft: COM apartments
- Microsoft: HRESULT values
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