| Previous | Next |
| kOSKextReturnKCLoadFailure | kOSKextReturnKCLoadFailureAuxKC |
kOSKextReturnKCLoadFailureSystemKC
The System KC subcode
kOSKextReturnKCLoadFailureSystemKC identifies failure to load the System Kernel Collection. XNU documents it as a subcode of kOSKextReturnKCLoadFailure that can be ORed with the AuxKC subcode. If both System KC and AuxKC fail, the reported low code is 0x1f.
That encoding is useful when decoding a raw integer from logs: the status does not just say “kext problem”; it identifies which collection layer failed. Do not drop the numeric value when normalizing diagnostic events.
How to decode related values
Low code in libkern_kext_err | Meaning |
|---|---|
0x1c | Base Kernel Collection failure family. |
0x1d | System KC failure. |
0x1e | AuxKC failure. |
0x1f | Both System KC and AuxKC failure bits. |
Diagnostic priorities
- Keep the raw status, boot context, and earlier collection diagnostics together.
- Separate the System KC result from third-party kext approval or AuxKC inclusion evidence.
- Do not assume a file copied to disk was present in the active collection during the failing boot.
References
Looking for a different code? Search another status or error code.