Why is a .crash log showing crash in UIPresentationController but my app doesn't use UIPresentationController?

I've got an app in the app store and there's a crash report showing there's a very occasional crash with details below:

Incident Identifier: C25BD8DF-FAA9-4A5F-B3D2-6E1CE81F1D17 CrashReporter Key:   798f7dee81117ed0f05b3f19dc4bbc2874eefaf6 Hardware Model:      iPhone9,2 Process:             My app [1936] Path:                /private/var/containers/Bundle/Application/757D7BE6-4F91-4B74-BA64-09FA53AE3E16/My app.app/My app Identifier:          com.app.Myapp Version:             12 (1.1) Code Type:           ARM-64 (Native) Role:                Foreground Parent Process:      launchd [1] Coalition:           com.app.Myapp [701]   Date/Time:           2017-06-27 20:05:28.7901 -0400 Launch Time:         2017-06-27 16:38:23.0376 -0400 OS Version:          iPhone OS 10.3.2 (14F89) Report Version:      104  Exception Type:  EXC_BAD_ACCESS (SIGSEGV) Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000010 Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [0] Triggered by Thread:  0  Thread 0 name: Thread 0 Crashed: 0   UIKit                           0x0000000190ee4264 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke + 444 (UIPresentationController.m:731) 1   UIKit                           0x0000000190ee4260 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke + 440 (UIPresentationController.m:731) 2   UIKit                           0x0000000190e20950 _runAfterCACommitDeferredBlocks + 292 (UIApplication.m:2469) 3   UIKit                           0x0000000190e129ec _cleanUpAfterCAFlushAndRunDeferredBlocks + 528 (UIApplication.m:2447) 4   UIKit                           0x0000000190b86648 _afterCACommitHandler + 132 (UIApplication.m:2499) 5   CoreFoundation                  0x000000018aa109a8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32 (CFRunLoop.c:1802) 6   CoreFoundation                  0x000000018aa0e630 __CFRunLoopDoObservers + 372 (CFRunLoop.c:1898) 7   CoreFoundation                  0x000000018aa0ea7c __CFRunLoopRun + 956 (CFRunLoop.c:2849) 8   CoreFoundation                  0x000000018a93eda4 CFRunLoopRunSpecific + 424 (CFRunLoop.c:3113) 9   GraphicsServices                0x000000018c3a8074 GSEventRunModal + 100 (GSEvent.c:2245) 10  UIKit                           0x0000000190bf9058 UIApplicationMain + 208 (UIApplication.m:4089) 11  My app                          0x000000010005a8b4 main + 56 (Database.swift:17) 12  libdyld.dylib                   0x000000018994d59c start + 4 

My app doesn't use UIPresentationController so why is this showing as the last line in Thread 0 which is the thread that crashed?

1 Answers

Answers 1

Without looking at your code exactly this is quite hard to answer. Commonly, you should check possible classes (including system frameworks) that you might ignore are actually a subclass of UIPresentationController. In addition, a 3rd party library might be referencing this class (or subclass).

However most likely is that this is a crash in UIKit. UIPresentationController is a class that provides advanced view controller management and handles transitioning between controllers. Most likely, UIKit is crashing somewhere (very possibly due to your code). More info in the Apple docs.

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