macOS kernel return 0xDC004009 (kOSMetaClassInstNoSuper): meaning

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: OSMetaClass could not resolve an instance's registered superclass.

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kOSMetaClassNoSuper	kOSMetaClassDuplicateClass

kOSMetaClassInstNoSuper

kOSMetaClassInstNoSuper is the instance-construction counterpart to a missing superclass association in the legacy OSMetaClass runtime. Its historical meaning is that construction reached a class whose expected parent could not be identified in the registered hierarchy.

Current XNU marks the associated branch as “never returned.” Therefore the status should not be used as a generic diagnosis for an application object or a USB/PCI device. When it appears in an older source tree or log, investigate the kext's class registration and constructor order before examining device I/O.

Relevant checks

Confirm the parent metaclass is available and registered before derived objects are constructed.
Review kext dependencies and the order in which static C++ constructors execute.
Look for an earlier kOSMetaClassNoSuper, duplicate-class, or initialization failure.
Preserve the class and kext names in diagnostics; the numeric value alone cannot locate the broken hierarchy.

References

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