"kmutil inspect" also fails with the same error message when booted using an external drive, but works fine when booting with the internal "Macintosh HD".
Both errors indicate the "kernelcache" file cannot be found:
Code Block sh-3.2# /usr/bin/kmutil load -p /Library/Extensions/XXXX.kext Error Domain=KMErrorDomain Code=71 "Could not find: Unable to get contents of boot kernel collection collection at /System/Volumes/Preboot/3B670FAA-F124-41AB-98A8-7C3940B5ECAC/boot/16FE8A65862647F7F8752DA7C4EF320E4CADEB250FCF438FB84A55F822BEB4A98108829E21658BB08B1E314BBC85169A/System/Library/Caches/com.apple.kernelcaches/kernelcache" UserInfo={NSLocalizedDescription=Could not find: Unable to get contents of boot kernel collection collection at /System/Volumes/Preboot/3B670FAA-F124-41AB-98A8-7C3940B5ECAC/boot/16FE8A65862647F7F8752DA7C4EF320E4CADEB250FCF438FB84A55F822BEB4A98108829E21658BB08B1E314BBC85169A/System/Library/Caches/com.apple.kernelcaches/kernelcache}
Code Block sh-3.2# /usr/bin/kmutil inspect No variant specified, falling back to release Error Domain=KMErrorDomain Code=71 "Invalid argument: Unable to read contents of file at /System/Volumes/Preboot/3B670FAA-F124-41AB-98A8-7C3940B5ECAC/boot/904DF99E6EB1281F8E510B3FFB953383F530F313CCFB30A9C1F98231A81B02BDA5E6E0D2BF26FC5D4EB3D2E226B8BC1C/System/Library/Caches/com.apple.kernelcaches/kernelcache" UserInfo={NSLocalizedDescription=Invalid argument: Unable to read contents of file at /System/Volumes/Preboot/3B670FAA-F124-41AB-98A8-7C3940B5ECAC/boot/904DF99E6EB1281F8E510B3FFB953383F530F313CCFB30A9C1F98231A81B02BDA5E6E0D2BF26FC5D4EB3D2E226B8BC1C/System/Library/Caches/com.apple.kernelcaches/kernelcache}
The "kernelcache" file path does not exist. In fact, there is no "904DF..." directory under "boot". There is no "kernelcache" file in the entire "/System/Volumes/Preboot" mount.
Code Block sh-3.2# find /System/Volumes/Preboot -name kernelcache find: /System/Volumes/Preboot/.Trashes: Operation not permitted
This is on an M1 MacBook Air running 11.3.
Is there a special way to load kernel extensions when booting from an external drive?
Thanks.
I am also waiting on information for this issue.
I can confirm the behavior is the same on an M1 mini with macOS 11.6.2 . Near as I can tell, current macOS 11/12 versions on M1 hardware do not support 3rd party kernel extensions when booted from external media. This seems like an oversight/defect, not an intentional design choice by Apple.
I would agree, but there doesn't seem to be a good way to report the defect. I submitted a ticket using Feedback Assistant in May 2021 and have not received a reply yet. I also verified the bug still exists in Monterey.