Error message '_BSMachError: (os/kern) invalid capability (20)'
Please note that this error message is pretty low level, so it crops up for different reasons in different scenarios. If you have a scenario that isn't mentioned in one of the answers below, please consider adding your situation as well, so maybe this could be a central answer for various situations that raise this error message.
Edit Nov 10, 2015 Also note, I marked my own answer as the answer, but that was before anyone else had posted. I guess none should really be marked as the answer, because as we've now seen below... this error doesn't have just one answer because it's so low level.
I'm running
- iOS 9.0 Simulator
- XCode 7.0
Everything was working fine yesterday.
Today, after a bunch of work on rotation related stuff, I started getting this error in my console output when I run the app in the Simulator and I rotate it.
_BSMachError: (os/kern) invalid capability (20)
_BSMachError: (os/kern) invalid name (15)
- I've cleared my build folder,
- I've cleaned the derived data folder,
- I've reset the simulator.
I was working with
UIViewController viewWillLayoutSubviewsUIViewController viewWillTransitionToSize:...
I was also checking various 'Drawing' settings on the Attributes Inspector in IB.
I also made a utility category on UIView where I created a bunch of methods that create CGRect's and helps me assign frames to views.
Ok, I haven't pinned it down completely, but this will get you 99% of the way there. I'm using a third party map control from ESRI, and something about it doesn't like one of these drawing settings in the Attributes Inspector. I haven't tried each setting individually to see which setting it is, but when I turned all of them off (in the red box), everything worked like a charm, and I quit getting the error message above in the console. If and when I get time to nail it down to the precise setting or combination of settings, i'll update the answer.
