I need help to debug the crash due to the reason "SIGABRT: mutex lock failed: Invalid argument" in
libc++abi.dylib
Thread 2 suggests that you have a third-party crash reporting running (something I don’t recommend, for reasons I outline in Implementing Your Own Crash Reporter). Unfortunately this seems to have disrupted the Apple crash report in a way that prevents further analysis of this crash. I recommend that you disable your third-party crash reporter, try to reproduce the problem again, and then post that ‘clean’ crash report.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"