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I am on Sonoma, and recently I noticed the error message: ipconfig_get_summary(utun3) failed: interface doesn't exist It pops up when working with VPN interfaces (e.g. utun3). I can't find any documentation or reference of this function online as of now. Does anyone have any reference for this function? P.S. This not a function in my code base

I have a multithreaded application that uses popen() for system calls. Here is the snippet. I crashes in popen() (line 2 below). 1 fp = NULL; 2 if ((fp = popen(dnsCommand, "r")) == NULL) { 3 logPrint(errno, "*executeDNS: popen failed. Exiting..."); 4 exitProcess(__func__, __LINE__); } I caught this under xcode debug and under cli lldb. To replicate it I have to let it run for several hours, and this functions is called repeatedly during that time. I can't really tell the exact conditions that cause the crash. The error messages is Thread 43: EXC_BAD_ACCESS (code=1, address=0x3010000080e) In this case dnsCommand is dnsCommand char [200] "/Applications/NetBeez/bin/dig +noall +search +stats +comments xfinity.com 2>/dev/null" Here is the backtrace (lldb) bt * thread #43, stop reason = EXC_BAD_ACCESS (code=1, address=0x3010000080e) * frame #0: 0x00007ff803997d22 libsystem_c.dylib`popen + 478 frame #1: 0x000000010004b53e nbagentgdb`executeDNS(param=0x0000000128900000) at executeDNS.c:235:19 frame #2: 0x0000000100015778 nbagentgdb`executeTest(param=0x0000000128900000) at utilities.c:910:17 frame #3: 0x0000000100549cd0 libsystem_pthread.dylib`_pthread_start + 125 frame #4: 0x0000000100551cff libsystem_pthread.dylib`thread_start + 15 Here is where it crashed in popen() 0x7ff803997d1c <+472>: je 0x7ff803997d35 ; <+497> 0x7ff803997d1e <+474>: leaq -0x68(%rbp), %r12 -> 0x7ff803997d22 <+478>: movl 0x10(%rbx), %esi 0x7ff803997d25 <+481>: movq %r12, %rdi 0x7ff803997d28 <+484>: callq 0x7ff8039c68ee ; symbol stub for: posix_spawn_file_actions_addclose 0x7ff803997d2d <+489>: movq (%rbx), %rbx And the variables (lldb) register read rbx rbx = 0x00000301000007fe (lldb) register read esi esi = 0x000aa000 I have the debugger hot right now on xcode, so if you need any other debug info lmk. I suspect it crashes when the laptop goes to sleep, but is not consistent. Any idea how to troubleshoot further?