1 Reply
      Latest reply on Aug 20, 2016 10:54 AM by john daniel
      john daniel Level 4 Level 4 (550 points)

        I am getting the following crash in my child process just after fork():


        Crashed Thread:        0  Dispatch queue: com.apple.root.default-qos



        Exception Type:        EXC_BAD_INSTRUCTION (SIGILL)

        Exception Codes:       0x0000000000000001, 0x0000000000000000

        Exception Note:        EXC_CORPSE_NOTIFY



        Termination Signal:    Illegal instruction: 4

        Termination Reason:    Namespace SIGNAL, Code 0x4

        Terminating Process:   exc handler [0]



        Application Specific Information:

        crashed on child side of fork pre-exec

        BUG IN CLIENT OF LIBPLATFORM: Unlock of an os_unfair_lock not owned by current thread



        Thread 0 Crashed:: Dispatch queue: com.apple.root.default-qos

        0   libsystem_platform.dylib       0x00007fffa83a4bf7 _os_unfair_lock_unowned_abort + 23

        1   libsystem_platform.dylib       0x00007fffa83a4539 _os_unfair_lock_unlock_slow + 95

        2   libBacktraceRecording.dylib   0x000000010017810c fork_child_process_handler + 23

        3   libsystem_pthread.dylib       0x000000010020f54e _pthread_fork_child_postinit + 69

        4   libSystem.B.dylib             0x00007fffa6b9eb50 libSystem_atfork_child + 64

        5   libsystem_c.dylib             0x00007fffa81db477 fork + 47


        This app runs fine in El Capitan. The El Capitan build runs fine in Sierra. But I get the crash when I build in Xcode8 and run in Sierra. Any ideas?