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SQLITE_E_IOERR_UNLOCK
SQLITE_E_IOERR_UNLOCK corresponds to SQLITE_IOERR_UNLOCK: the VFS failed in its xUnlock operation while releasing an SQLite file lock.
What to check for SQLITE_E_IOERR_UNLOCK
- Check for filesystem or VFS implementations that do not reliably support advisory file locks.
- Avoid multiple independent writers through network shares or filesystem proxies whose lock semantics are uncertain.
- Capture the SQLite journal mode and connection topology before changing concurrency settings.
PRAGMA journal_mode;SQLite: Result and Error Codes
SQLite: File Locking and Concurrency
SQLite: Network Filesystem Considerations
Diagnostic interpretation of SQLITE_E_IOERR_UNLOCK
SQLITE_E_IOERR_UNLOCK has the HRESULT value 0x87AF080A. AllStat records the condition as “SQLITE_IOERR_UNLOCK”. For SQLITE_E_IOERR_UNLOCK, in practice, interpret that wording at the boundary owned by the Windows component or COM interface that returned the HRESULT, rather than treating the value as a generic Windows message.
Evidence to capture for SQLITE_E_IOERR_UNLOCK
- Record the exact COM method or Windows API, its input object, the calling thread, and the full 0x87AF080A value before a wrapper converts it to an exception or Boolean result.
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions SQLITE_E_IOERR_UNLOCK or the sqlite / ioerr / unlock operation.
- For SQLITE_E_IOERR_UNLOCK, check the documented return contract of the specific API because the same HRESULT can require different recovery in different interfaces.
Retry and recovery for SQLITE_E_IOERR_UNLOCK
Retry SQLITE_E_IOERR_UNLOCK only when the owning API documents a transient state or after the condition described as “SQLITE_IOERR_UNLOCK” has changed. For SQLITE_E_IOERR_UNLOCK, configuration, policy, format, and authorization failures normally require correction first; an immediate loop can hide the original call site and add secondary errors.
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