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kOSKextReturnCache
A system kext-cache processing error
kOSKextReturnCache identifies an error while processing a system kext cache. It does not assert that the target kext is malformed, nor does it name a policy, architecture, dependency, or memory cause. Preserve the detailed cache or collection diagnostic that preceded it.
Modern macOS uses a different deployment model from older standalone cache workflows: third-party kext changes are incorporated into an Auxiliary Kernel Collection and take effect at boot. The legacy return code remains useful because it identifies a processing stage, but the current machine’s AuxKC state may be the more relevant evidence.
Do not collapse these stages
| Status | Stage identified |
|---|---|
kOSKextReturnCache | System kext-cache processing. |
kOSKextReturnKCLoadFailure | Loading of a Kernel Collection failed. |
kOSKextReturnSystemPolicy | Policy blocked loading of the selected kext. |
What to collect
- The macOS version, hardware family, target bundle, and exact cache or collection command path.
- The first detailed diagnostic before the final cache status.
- Whether a restart and AuxKC rebuild are part of the documented deployment flow for the change.
References
- Apple XNU: OSKextLib.h
- Apple Platform Security: Auxiliary Kernel Collection design
- Apple Platform Deployment: restart and AuxKC rebuild
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