$ uname -a Darwin camotes 15.5.0 Darwin Kernel Version 15.5.0: Tue Apr 19 18:36:36 PDT 2016; root:xnu-3248.50.21~8/RELEASE_X86_64 x86_64 $ port installed | grep netcat netcat @1.10_2 (active) $ nc -l 4040 Abort trap: 6 $ sudo dtruss -fn nc PID/THRD SYSCALL(args) = return 59571/0x90d79b: thread_selfid(0x7FAA23F02CD0, 0x7FAA23E01200, 0x7FAA25800000) = 9492379 0 59571/0x90d79b: csops(0x0, 0x0, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: issetugid(0x0, 0x0, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: shared_region_check_np(0x7FFF5579B1C8, 0x0, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/libSystem.B.dylib\0", 0x7FFF5579C588, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libcache.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libcommonCrypto.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libcompiler_rt.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libcopyfile.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libcorecrypto.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libdispatch.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libdyld.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libkeymgr.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/liblaunch.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libmacho.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libquarantine.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libremovefile.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_asl.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_blocks.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_c.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_configuration.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_coreservices.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_coretls.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_dnssd.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_info.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_kernel.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_m.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_malloc.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_network.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_networkextension.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_notify.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_platform.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_pthread.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_sandbox.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_secinit.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libsystem_trace.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libunc.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libunwind.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/system/libxpc.dylib\0", 0x7FFF5579C198, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/libobjc.A.dylib\0", 0x7FFF5579B478, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/libauto.dylib\0", 0x7FFF5579B478, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/libc++abi.dylib\0", 0x7FFF5579B358, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/libc++.1.dylib\0", 0x7FFF5579B358, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: stat64("/usr/lib/libDiagnosticMessagesClient.dylib\0", 0x7FFF5579B248, 0x7FFF5579D2C0) = 0 0 59571/0x90d79b: open("/dev/dtracehelper\0", 0x2, 0x7FFF5579D180) = 3 0 59571/0x90d79b: ioctl(0x3, 0x80086804, 0x7FFF5579D108) = 0 0 59571/0x90d79b: close(0x3) = 0 0 59571/0x90d79b: sysctl(0x7FFF5579C8D0, 0x2, 0x7FFF5579C8E0) = 0 0 59571/0x90d79b: thread_selfid(0x7FFF5579C8D0, 0x2, 0x7FFF5579C8E0) = 9492379 0 59571/0x90d79b: bsdthread_register(0x7FFF996CF344, 0x7FFF996CF334, 0x2000) = 1073741887 0 59571/0x90d79b: mprotect(0x10A469000, 0x88, 0x1) = 0 0 59571/0x90d79b: mprotect(0x10A46B000, 0x1000, 0x0) = 0 0 59571/0x90d79b: mprotect(0x10A481000, 0x1000, 0x0) = 0 0 59571/0x90d79b: mprotect(0x10A482000, 0x1000, 0x0) = 0 0 59571/0x90d79b: mprotect(0x10A498000, 0x1000, 0x0) = 0 0 59571/0x90d79b: mprotect(0x10A499000, 0x1000, 0x1) = 0 0 59571/0x90d79b: mprotect(0x10A469000, 0x88, 0x3) = 0 0 59571/0x90d79b: mprotect(0x10A469000, 0x88, 0x1) = 0 0 59571/0x90d79b: issetugid(0x10A469000, 0x88, 0x1) = 0 0 59571/0x90d79b: getpid(0x10A469000, 0x88, 0x1) = 59571 0 59571/0x90d79b: stat64("/AppleInternal/XBS/.isChrooted\0", 0x7FFF5579C838, 0x1) = -1 Err#2 59571/0x90d79b: stat64("/AppleInternal\0", 0x7FFF5579C7A8, 0x1) = -1 Err#2 59571/0x90d79b: csops(0xE8B3, 0x7, 0x7FFF5579C2C0) = -1 Err#22 59571/0x90d79b: sysctl(0x7FFF5579C680, 0x4, 0x7FFF5579C3F8) = 0 0 59571/0x90d79b: csops(0xE8B3, 0x7, 0x7FFF5579BBB0) = -1 Err#22 59571/0x90d79b: proc_info(0x2, 0xE8B3, 0x11) = 56 0 59571/0x90d79b: sigaction(0x2, 0x7FFF5579E2E8, 0x7FFF5579E310) = 0 0 59571/0x90d79b: sigaction(0x3, 0x7FFF5579E2E8, 0x7FFF5579E310) = 0 0 59571/0x90d79b: sigaction(0xF, 0x7FFF5579E2E8, 0x7FFF5579E310) = 0 0 59571/0x90d79b: sigaction(0x10, 0x7FFF5579E2E8, 0x7FFF5579E310) = 0 0 59571/0x90d79b: sigaction(0xD, 0x7FFF5579E2E8, 0x7FFF5579E310) = 0 0 59571/0x90d79b: getuid(0xD, 0x7FFF5579E2E8, 0x7FFF5579E310) = 501 0 59571/0x90d79b: getgid(0xD, 0x7FFF5579E2E8, 0x7FFF5579E310) = 20 0 59571/0x90d79b: shm_open(0x7FFF9856CD7F, 0x0, 0x0) = 3 0 59571/0x90d79b: mmap(0x0, 0x1000, 0x1, 0x1, 0x3, 0x0) = 0x10A69A000 0 59571/0x90d79b: close_nocancel(0x3) = 0 0 59571/0x90d79b: geteuid(0x3, 0x1000, 0x1) = 501 0 59571/0x90d79b: stat64("/etc/asl/.noquota\0", 0x7FFF5579D640, 0x1) = -1 Err#2 59571/0x90d79b: sigprocmask(0x1, 0x0, 0x7FFF5579E150) = 0x0 0 59571/0x90d79b: sigaltstack(0x0, 0x7FFF5579E140, 0x7FFF5579E150) = 0 0 59571/0x90d79b: sigprocmask(0x3, 0x7FFF5579E174, 0x0) = 0x0 0 59571/0x90d79b: __pthread_sigmask(0x3, 0x7FFF5579E180, 0x0) = 0 0 59571/0x90d79b: __pthread_kill(0x50F, 0x6, 0x0) = 0 0