I have an application that is occasionally crashing while unattended (once every couple of days). It seems to be crashing deep inside low level macOS functions. I was wondering if anyone could have a look at the crashlog and give me some insight as to where I should be looking for the issue. Thank-you in advance for any suggestions you can offer. Log is attached. Crash Log Rob

My app is crashing at startup. Can't get it to break anywhere. I mananged to get the simulator crash report. Any idea what the issue might be? Process: eDrumIn iOS [11555] Path: /Users/USER/Library/Developer/CoreSimulator/Devices/A0759871-46F0-4A67-BA20-42F4DA723424/data/Containers/Bundle/Application/B7969CF2-FAD1-4930-A03E-8F5F0654217A/eDrumIn iOS.app/eDrumIn iOS Identifier: eDrumIn iOS Version: ??? Code Type: X86-64 (Native) Parent Process: ??? [11556] Responsible: SimulatorTrampoline [481] User ID: 501 Date/Time: 2020-12-16 02:10:31.015 +0800 OS Version: macOS 11.1 (20C69) Report Version: 12 Bridge OS Version: 5.1 (18P3030) Anonymous UUID: 6AA3A78B-C26D-4A47-B7A6-2BDD900BBAC9 Time Awake Since Boot: 40000 seconds System Integrity Protection: enabled Crashed Thread: 0 Exception Type: EXCCRASH (Code Signature Invalid) Exception Codes: 0x0000000000000001, 0x0000000000000000 Exception Note: EXCCORPSENOTIFY Termination Reason: Namespace CODESIGNING, Code 0x2 kernel messages: External Modification Warnings: Debugger attached to process. VM Regions Near 0x114b48c6c (cr2): TEXT 114b35000-114b48000 [ 76K] r-x/r-x SM=COW /usr/lib/dyld-> TEXT 114b48000-114b49000 [ 4K] r-x/rwx SM=COW /usr/lib/dyld TEXT 114b49000-114bd1000 [ 544K] r-x/r-x SM=COW /usr/lib/dyld Thread 0 Crashed: 0 dyld 0x0000000114b48c6c dylddebuggernotification + 0 1 dyld 0x0000000114b47e05 gdbimagenotifier(dyldimagemode, unsigned int, dyldimageinfo const*) + 203 2 dyld 0x0000000114b3e463 dyld::useSimulatorDyld(int, machoheader const*, char const*, int, char const, char const, char const**, unsigned long*, unsigned long*) + 1814 3 dyld 0x0000000114b3bdf3 dyld::main(machoheader const*, unsigned long, int, char const, char const, char const**, unsigned long*) + 1199 4 dyld 0x0000000114b3622b dyldbootstrap::start(dyld3::MachOLoaded const*, int, char const**, dyld3::MachOLoaded const*, unsigned long*) + 457 5 dyld 0x0000000114b36025 dyldstart + 37 Thread 0 crashed with X86 Thread State (64-bit): rax: 0x0000000000000001 rbx: 0x00007ffee3016be0 rcx: 0x000000010d67d000 rdx: 0x00007ffee3016a70 rdi: 0x0000000000000000 rsi: 0x0000000000000001 rbp: 0x00007ffee3016b20 rsp: 0x00007ffee3016a68 r8: 0x0000000000000000 r9: 0x0000000000000000 r10: 0x0000000000000000 r11: 0x0000000000000000 r12: 0x00007ffee3016a88 r13: 0x000000010cbe5000 r14: 0x0000000000000000 r15: 0x0000000000000001 rip: 0x0000000114b48c6c rfl: 0x0000000000000293 cr2: 0x0000000114b48c6c Logical CPU: 0 Error Code: 0x00000015 (invalid protections for user instruction read) Trap Number: 14 Thread 0 instruction stream: 8d 45 10 48 89 42 08 48-b8 08 00 00 00 30 00 00 .E.H.B.H.....0.. 00 48 89 02 bf 02 00 00-00 4c 89 d6 e8 32 17 04 .H.......L...2.. 00 48 8d 05 cb 05 09 00-48 8b 00 48 3b 45 f8 75 .H......H..H;E.u 09 48 81 c4 d0 00 00 00-5d c3 e8 47 ff ff ff 55 .H......]..G...U 48 89 e5 48 8d 3d 57 79-07 00 e8 4e 12 ff ff 55 H..H.=Wy...N...U 48 89 e5 48 8d 3d 5a 79-07 00 e8 3e 12 ff ff cc H..H.=Zy...>.... [48]89 e5 5d c3 55 48 89-e5 48 8d 3d 69 79 07 00 H..].UH..H.=iy.. <== e8 28 12 ff ff 83 fe 08-75 01 c3 55 48 89 e5 48 .(......u..UH..H 8d 3d 6a 79 07 00 e8 12-12 ff ff 48 85 ff 74 2b .=jy.......H..t+ 45 31 c0 48 39 f1 48 0f-47 ce b8 54 00 00 00 41 E1.H9.H.G..T...A 0f 46 c0 48 85 c9 74 12-55 48 89 e5 31 f6 88 14 .F.H..t.UH..1... 37 48 ff c6 48 39 f1 75-f5 5d c3 b8 16 00 00 00 7H..H9.u.]...... Thread 0 last branch register state not available. Binary Images: 0x10d67d000 - 0x10d6d5fff +dyldsim (828.5) <78110D0A-D8B8-3F35-88B9-A554FF4A5326> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/dyldsim 0x114b35000 - 0x114bd0fff dyld (832.7.1) <DEA51514-B4E8-3368-979B-89D0F8397ABC> /usr/lib/dyld External Modification Summary: Calls made by other processes targeting this process: taskforpid: 1 threadcreate: 0 threadsetstate: 3 Calls made by this process: taskforpid: 0 threadcreate: 0 threadsetstate: 0 Calls made by all processes on this machine: taskforpid: 40747 threadcreate: 0 threadsetstate: 1137 VM Region Summary: ReadOnly portion of Libraries: Total=1312K resident=0K(0%) swappedoutorunallocated=1312K(100%) Writable regions: Total=8732K written=0K(0%) resident=0K(0%) swappedout=0K(0%) unallocated=8732K(100%) VIRTUAL REGION REGION TYPE SIZE COUNT (non-coalesced) =========== ======= ======= STACK GUARD 56.0M 1 Stack 8192K 1 VMALLOCATE 8K 2 VMALLOCATE (reserved) 132K 2 reserved VM address space (unallocated) _DATA 432K 4 DATACONST 40K 2 _LINKEDIT 348K 3 _TEXT 980K 4 mapped file 10.5M 7 =========== ======= ======= TOTAL 76.4M 26 TOTAL, minus reserved VM space 76.2M 26