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Zoltan, can you have a look?
I can reproduce the crash with current stable (18.104.22.168) with both simulator (both i386 and x86_64) and device.
With maccore master I can only reproduce the crash with the simulators, not on device.
Unfortunately the crash report isn't very helpful (to me at least), and attaching a debugger doesn't help much since it'll run into the expected breakpoint signals.
Crash report (using maccore/master): https://gist.github.com/rolfbjarne/0dd048aa65ce7fcbf58b
That library seems to install its own signal handlers, which is probably whats causing the crash:
* thread #1: tid = 0x16b275, 0x00000001966730f0 libsystem_c.dylib`sigaction, queue = 'com.apple.main-thread', stop reason = breakpoint 1.2
* frame #0: 0x00000001966730f0 libsystem_c.dylib`sigaction
frame #1: 0x0000000100456a5c iOSSample`-[PLCrashSignalHandler registerHandlerWithSignal:error:] + 272
frame #2: 0x0000000100456bfc iOSSample`-[PLCrashSignalHandler registerHandlerForSignal:callback:context:error:] + 40
frame #3: 0x0000000100459954 iOSSample`-[PLCrashReporter enableCrashReporterAndReturnError:] + 780
frame #4: 0x0000000100437ebc iOSSample`-[ADEumCrashReporter enableCrashReporting] + 104
frame #5: 0x00000001004558b4 iOSSample`-[ADEumCrashReportingFeature init] + 204
frame #6: 0x00000001004557ac iOSSample`-[ADEumCrashReportingFeatureFactory createFeature] + 32
The reason this doesn't happen on cycle6 is that we no longer use signals to implement debugging on arm64.
Zoltan is right, the library is installing it's own crash reporter, which interferes with our debugger.
The workaround is explained here: http://stackoverflow.com/a/14499336/183422