ios crash EXC_BAD_ACCESS KERN_INVALID_ADDRESS

This is an old question but the EXC_BAD_ACCESS KERN_INVALID_ADDRESS crash is not due to memory leak, but due to the attempt to access an deallocated object. Because the memory of the deallocated object is possibly now occupied by another object of different type, the last line in the crash stack might be mis-leading because it's not really part of your programmed execution path, so usually we need to look up the trace a little bit. However the stack trace posted by @Sj consists basically only of system calls so it's really hard. If this is generated in a debug session, adding an "All Exceptions" breakpoint might help generate a more informative stack trace.

This crash occurs due to a dangling pointer. When any variable or object is trying to access an object that's already been deallocated, this crash occurs.