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ERROR_DLL_INIT_FAILED_LOGOFF
What this result means
ERROR_DLL_INIT_FAILED_LOGOFF is a Windows system result. The process attempted to load or initialize a module during session teardown. The underlying condition is lifecycle timing: user-session resources are disappearing and new initialization is no longer safe.
Likely causes
- a background worker starts new work after logoff begins
- shutdown ordering loads a DLL from a cleanup callback
- COM, shell, or UI initialization is attempted from a service or late session notification
- a module performs excessive work from DllMain
How to diagnose it
Record session-change notifications, process and thread IDs, loader stack, module name, service/session identity, and shutdown timestamps. Determine who initiated the late load and whether cancellation was propagated.
Correct handling
Stop accepting work when logoff begins, cancel pending tasks, and complete module initialization earlier. Keep DllMain minimal and do not retry loading during teardown. Services should avoid dependencies on an interactive window station.
Where this code is usually encountered
- A process is shutting down because the interactive session is logging off while a DLL initialization routine fails.
- A DLL performs work in DllMain that depends on services, user profile, or windows already being torn down.
- Loader-lock contention or an exception occurs during process detach.
Evidence worth collecting
- the failing DLL, process, and session ID
- exception or loader-snaps output around DllMain
- logoff, service-stop, and user-profile events
- threads and locks held when detach began
Practical diagnostic sequence
- Enable targeted loader diagnostics for the affected process, not system-wide verbose tracing.
- Inspect DllMain for blocking calls, thread waits, COM initialization, registry/profile access, and dynamic loading.
- Move cleanup to an explicit shutdown method and retest repeated logon/logoff cycles.
- Check whether endpoint software injects the DLL only in interactive sessions.
Guidance for developers
DllMain must perform minimal, loader-safe work. Cleanup should tolerate dependencies already gone and must not wait for threads that require the loader lock to exit.
Guidance for administrators
Update or remove the component owning the DLL. Extending logoff timeouts hides the race and can worsen user-session shutdown.
How to interpret it correctly
This is not a normal application initialization failure at startup; the “LOGOFF” variant places the failure in session teardown and changes which dependencies may still exist.
Example failure pattern
The failure often disappears during ordinary process exit but reproduces during interactive logoff because profiles, COM apartments, windows, services, and network resources are torn down in a different order. A dedicated logon/logoff loop is therefore more valuable than a simple launch-and-close test.
Retry and recovery policy
Do not restart the process while the session is ending. Record the DLL and detach stack, permit logoff to complete, and correct the shutdown contract before enabling automatic recovery.
Suggested telemetry
For ERROR_DLL_INIT_FAILED_LOGOFF, record the operation name, component version, process and thread identity, the original numeric result, the immediately preceding state transition, and a correlation identifier. Keep the ERROR_DLL_INIT_FAILED_LOGOFF event separate from later fallback failures so its first actionable cause remains searchable across machines.
References
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