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OSS_TRACE_FILE_ALREADY_OPEN
OSS_TRACE_FILE_ALREADY_OPEN (0x8009301C) is an OSS ASN.1 runtime result for duplicate trace-file open request. The control context already owns an open trace destination when the application tries to open it again. Because open and close call sequence is central to this condition, Microsoft’s HRESULT range and the OSS Nokalva return-code documentation should be read together. Start the investigation by recording control object identity associated with the handle, then separate the encoded value from generated artifacts, call arguments, and the runtime package actually loaded by the process.
Where processing stopped
At the duplicate trace-file open request boundary, capture the first OSS function returning the value and note whether the operation was encode, decode, copy, compare, constraint validation, or trace setup. Preserve the selected PDU, encoding rules, and configuration reload and retry timestamps; otherwise an outer certificate or security wrapper may hide the useful codec result behind a generic failure.
Facts that change the conclusion
- open and close call sequence
- control object identity associated with the handle
- configuration reload and retry timestamps
Similar names, different faults: the result
This is a lifecycle error, unlike CANT_OPEN_TRACE_FILE, which indicates the first open could not acquire a file.
Isolation sequence
- make trace setup idempotent
- close the old sink before replacing it
- serialize configuration changes in a stress test
Instrumentation
Where open and close call sequence can expose sensitive content, a hash plus a bounded structural excerpt is safer than the complete payload. Use control object identity associated with the handle together with OSS module paths and versions logged once per process so packaging differences can be correlated without flooding normal diagnostics.
Completion check: the result
Define one owner for trace setup and verify reopen behavior during configuration reload.
Technical references
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