Error OSSystemExtensionErrorDomain Code=4 "(null)"

Question

Himadeus OP

Created Jan ’24

Replies 4

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When my macOS app try to deactivate CameraExtension, my app's didFailWithError is called with this error.

Error Domain=OSSystemExtensionErrorDomain Code=4 "(null)"

I cannot search for error code=4 with that domain.

MyApp calls OSSystemExtensionManager.shared.submitRequest with OSSystemExtensionRequest.deactivationRequest

I did implement these tasks.

BundleID, MyApp: com.myapp,
BundleID, CameraExtension: com.myapp.camera
Added entitlement and App Groups for app and extension
MyApp has SystemExtension capability on Xcode and provision
MyApp is installed on /Applications/MyAppGroup/MyApp.app
MyApp is executed by Finder

macOS is Sonoma 14.2.1 (23C71) on M1 MacBook

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Answer 1

ssmith_c OP

Jan ’24

I think this error is OSSystemExtensionErrorExtensionNotFound, from <SystemExtensions/SystemExtensions.h>.

I see this error also when I try to deactivate my camera extension (after approving its removal with the OS' dialog), but I'm running on a laptop with a built-in, non-removable camera. Maybe the error doesn't happen if there are no cameras in the system, so my extension can be unloaded.

I don't know and don't particularly care, because in our shipping apps we never make a deactivationRequest. It isn't clear to me what that API is for - as far as the user is concerned, the driver is installed because they installed its host app and approved it.

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Answer 2

Himadeus OP

Jan ’24

I made sure my camera extension is installed and activated

With command "systemextensionsctl list" and my camera extension is listed with "[activated enabled]"

Host app calls API OSSystemExtensionManager.shared.submitRequest with OSSystemExtensionRequest.propertiesRequest. OSSystemExtensionRequestDelegate.foundProperties is called with my extension's bundle ID.

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Answer 3

Himadeus OP

Jan ’24

In some condition, like kill app pocess during OSSystemExtensionManager.shared.submitRequest(), CameraExtension go into unstable condition. Normal uninstall is not possible.

I need to do

Reboot MacBook with recovery mode
run "csrutil disatble"
Reboot
run "systemextensionsctl uninstall [teamID] [BundleID]"
Reboot with recovery mode
run "csrutil enable"
Reboot

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Answer 4

DTS Engineer OP

Apple

Jan ’24

If you have a reproducible process for getting your Mac into this state, please do file a bug about it. This sort of hoop jumping shouldn’t be necessary.

I’d appreciate you postingf your bug number, just for the record.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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