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kOSMetaClassNoKModSet
kOSMetaClassNoKModSet denotes failure to create or retain the internal set that OSMetaClass uses to record a kext during class registration. XNU describes it as an allocation failure for the internal kext-recording set or as that set being absent.
The code belongs to legacy kernel-extension loading. It should be investigated with the kext identifier, registration order, and kernel loader diagnostics, not with device-level reset actions. The value does not say that a specific hardware module disappeared; it says the loader could not maintain its registration bookkeeping.
What to verify
- Confirm that the failure occurs while classes are being registered for one kext load transaction.
- Review earlier OSMetaClass allocation and initialization messages.
- Check that a failed or cancelled prior load did not leave stale loader state in the diagnostic path.
- For new development, avoid relying on this legacy kext lifecycle where a supported user-space alternative exists.
References
- Apple XNU: OSReturn.h
- Apple XNU: OSMetaClass.cpp
- Apple: deprecated kernel extensions and alternatives
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