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ERROR_FLT_DELETING_OBJECT
The target object has crossed its teardown boundary
ERROR_FLT_DELETING_OBJECT is returned by multiple Filter Manager APIs when a filter, instance, volume relationship, or other referenced object is already being torn down. A pointer can still be non-null and reference-counted while the object no longer accepts new contexts or operations; pointer validity alone therefore does not prove lifecycle eligibility.
The caller should stop scheduling new work against that object and release its own references. Retrying in a loop usually races teardown and can delay unload. If work must survive instance removal, it needs ownership outside the disappearing object and an explicit cancellation or handoff design rather than a cached opaque Filter Manager pointer.
Lifecycle evidence
- Correlate the failure with instance teardown, filter unload, volume dismount, or connection closure.
- Prevent new queue entries after the component begins draining.
- Let cleanup callbacks release object-specific resources without creating replacement contexts.
- Reacquire a new object from Filter Manager after reattachment instead of reusing the stale handle.
References
- Microsoft: teardown result from FltAllocateContext
- Microsoft: context setting during instance teardown
- Microsoft: minifilter draining behavior
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