Xcode12.5 These crashes mostly happened after app launch for several seconds on iOS14 Thread 0 Crashed: 0 libobjc.A.dylib 0x00000001a2ab7978 objc_msgSend + 24 1 UIKitCore 0x000000019113bea4 -[UIKeyboardImpl unmarkText:] + 200 2 UIKitCore 0x0000000191141eec __59-[UIKeyboardImpl handleAcceptedCandidate:executionContext:]_block_invoke_2 + 432 3 UIKitCore 0x0000000191174478 -[UIKeyboardTaskEntry execute:] + 184 4 UIKitCore 0x0000000191172f6c -[UIKeyboardTaskQueue continueExecutionOnMainThread] + 320 5 UIKitCore 0x00000001911738d0 -[UIKeyboardTaskQueue waitUntilTaskIsFinished:] + 168 6 UIKitCore 0x00000001911739e4 -[UIKeyboardTaskQueue performSingleTask:] + 152 7 UIKitCore 0x000000019114e9c8 -[UIKeyboardImpl acceptCurrentCandidateForInput:] + 296 8 UIKitCore 0x0000000190fa3a44 -[UIKeyboardCandidateController candidateView:didAcceptCandidate:atIndexPath:inGridType:generateFeedback:] + 176 9 UIKitCore 0x0000000190fa396c -[UIKeyboardCandidateController candidateView:didAcceptCandidate:atIndexPath:inGridType:] + 96 10 TextInputUI 0x0000000196979c2c -[TUICandidateView candidateGrid:didAcceptCandidate:atIndexPath:] + 204 11 TextInputUI 0x0000000196992a58 -[TUICandidateGrid collectionView:didSelectItemAtIndexPath:] + 180 12 UIKitCore 0x0000000190a96104 -[UICollectionView _selectItemAtIndexPath:animated:scrollPosition:notifyDelegate:deselectPrevious:performCustomSelectionAction:] + 896 13 UIKitCore 0x0000000190abfe7c -[UICollectionView touchesEnded:withEvent:] + 572 14 UIKitCore 0x0000000191392200 forwardTouchMethod + 340 15 UIKitCore 0x00000001913922fc -[UIResponder touchesEnded:withEvent:] + 60 16 UIKitCore 0x0000000191392200 forwardTouchMethod + 340 17 UIKitCore 0x00000001913922fc -[UIResponder touchesEnded:withEvent:] + 60 18 UIKitCore 0x0000000191392200 forwardTouchMethod + 340 19 UIKitCore 0x00000001913922fc -[UIResponder touchesEnded:withEvent:] + 60 20 UIKitCore 0x00000001913a0c04 -[UIWindow _sendTouchesForEvent:] + 984 21 UIKitCore 0x00000001913a256c -[UIWindow sendEvent:] + 3972 22 UIKitCore 0x000000019137c190 -[UIApplication sendEvent:] + 708 23 UIKitCore 0x0000000191403560 __dispatchPreprocessedEventFromEventQueue + 7356 24 UIKitCore 0x00000001914064b8 __processEventQueue + 6456 25 UIKitCore 0x00000001913fda3c __eventFetcherSourceCallback + 156 26 CoreFoundation 0x000000018e9bf81c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 27 CoreFoundation 0x000000018e9bf718 __CFRunLoopDoSource0 + 204 28 CoreFoundation 0x000000018e9bea28 __CFRunLoopDoSources0 + 264 29 CoreFoundation 0x000000018e9b8d20 __CFRunLoopRun + 820 30 CoreFoundation 0x000000018e9b84bc CFRunLoopRunSpecific + 596 31 GraphicsServices 0x00000001a543d820 GSEventRunModal + 160 32 UIKitCore 0x000000019135c734 -[UIApplication _run] + 1068 33 UIKitCore 0x0000000191361e10 UIApplicationMain + 164 34 sohuhy 0x0000000103892b88 main (main.m:14) 35 libdyld.dylib 0x000000018e67fe60 start + 0 My question is How to location this crash call stack in App Source Code？

Xcode12.5 These crashes mostly happened after app launch for several seconds on iOS14 Exception Type: SIGABRT Exception Codes: #0 at 0x1b4a9d334 Crashed Thread: 37 Thread 37 Crashed: 0 libsystem_kernel.dylib 0x00000001b4a9d334 __pthread_kill + 8 1 libsystem_c.dylib 0x000000018fd34b90 abort + 100 2 libsystem_malloc.dylib 0x0000000195fb64c8 malloc_vreport + 556 3 libsystem_malloc.dylib 0x0000000195fb676c malloc_zone_error + 100 4 libsystem_malloc.dylib 0x0000000195fa6f98 nanov2_allocate_from_block + 568 5 libsystem_malloc.dylib 0x0000000195fa6024 nanov2_allocate + 124 6 libsystem_malloc.dylib 0x0000000195fa5f40 nanov2_malloc + 60 7 libsystem_malloc.dylib 0x0000000195faa9a0 _malloc_zone_malloc + 148 8 libxpc.dylib 0x00000001d2523478 _xpc_malloc + 20 9 libxpc.dylib 0x00000001d2514e50 _xpc_dictionary_insert + 388 10 libxpc.dylib 0x00000001d25155c4 xpc_dictionary_set_uint64 + 52 11 libnetwork.dylib 0x00000001879de430 nw_path_copy_dictionary_for_agent_with_generation + 524 12 libnetwork.dylib 0x00000001879da048 nw_path_snapshot_path + 432 13 libnetwork.dylib 0x00000001879d9614 nw_path_evaluator_evaluate + 3516 14 libnetwork.dylib 0x00000001879d8058 nw_path_create_evaluator_for_endpoint + 104 15 libnetwork.dylib 0x00000001876ec654 nw_association_activate + 120 16 libnetwork.dylib 0x00000001876eb468 nw_association_register + 256 17 libnetwork.dylib 0x000000018753fd20 nw_endpoint_handler_initialize_association + 248 18 libnetwork.dylib 0x000000018754c0ec nw_endpoint_handler_start + 1116 19 libnetwork.dylib 0x0000000187768f2c nw_endpoint_fallback_start_fallback_child + 2864 20 libdispatch.dylib 0x000000018657381c _dispatch_client_callout + 16 21 libdispatch.dylib 0x0000000186576cf4 _dispatch_continuation_pop + 444 22 libdispatch.dylib 0x00000001865894b8 _dispatch_source_invoke + 1280 23 libdispatch.dylib 0x000000018657cee8 _dispatch_workloop_invoke + 1676 24 libdispatch.dylib 0x00000001865864bc _dispatch_workloop_worker_thread + 760 25 libsystem_pthread.dylib 0x00000001d24ea7a4 _pthread_wqthread + 272 26 libsystem_pthread.dylib 0x00000001d24f174c start_wqthread + 4 Thread 0: 0 libsystem_kernel.dylib 0x00000001b4a784fc mach_msg_trap + 8 1 CoreFoundation 0x00000001868ffeb0 __CFRunLoopServiceMachPort + 368 2 CoreFoundation 0x00000001868f9d50 __CFRunLoopRun + 1208 3 CoreFoundation 0x00000001868f9360 CFRunLoopRunSpecific + 596 4 GraphicsServices 0x000000019df37734 GSEventRunModal + 160 5 UIKitCore 0x0000000189374584 -[UIApplication _run] + 1068 6 UIKitCore 0x0000000189379df4 UIApplicationMain + 164 7 sohuhy 0x0000000101358410 main (main.m:14) 8 libdyld.dylib 0x00000001865b5cf8 start + 0 Thread 1: 0 libsystem_kernel.dylib 0x00000001b4a9e0a4 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x00000001d24f174c start_wqthread + 4 Thread 2: 0 libsystem_kernel.dylib 0x00000001b4a9e0a4 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x00000001d24f174c start_wqthread + 4 Thread 3: 0 libsystem_kernel.dylib 0x00000001b4a9e0a4 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x00000001d24f174c start_wqthread + 4 Thread 4: 0 libsystem_kernel.dylib 0x00000001b4a9e0a4 __workq_kernreturn + 8 1 libsystem_pthread.dylib 0x00000001d24f174c start_wqthread + 4 Thread 5: 0 libsystem_kernel.dylib 0x00000001b4a784fc mach_msg_trap + 8 1 CoreFoundation 0x00000001868ffeb0 __CFRunLoopServiceMachPort + 368 2 CoreFoundation 0x00000001868f9d50 __CFRunLoopRun + 1208 3 CoreFoundation 0x00000001868f9360 CFRunLoopRunSpecific + 596 4 Foundation 0x0000000187be6fdc -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 228 5 Foundation 0x0000000187be6ea8 -[NSRunLoop(NSRunLoop) runUntilDate:] + 88 6 UIKitCore 0x000000018942912c -[UIEventFetcher threadMain] + 512 7 Foundation 0x0000000187d5832c __NSThread__start__ + 860 8 libsystem_pthread.dylib 0x00000001d24e8bfc _pthread_start + 316 9 libsystem_pthread.dylib 0x00000001d24f1758 thread_start + 4 thank you for anyone to provide some advice for digging into this problem!