iOS app crashed due to [UIFeedbackGenerator _autoDeactivate]

Question

I received the following report from Crashlytics. I was not calling[UIFeedbackGenerator _autoDeactivate] myself. Maybe some library was doing that. I have done some research but could not find any useful information. Does anyone know what this crash report means? Thank you!

Fatal Exception: NSInternalInconsistencyException

Exception raised while auto-deactivating <UISelectionFeedbackGenerator: 0x1c012d7a0: prepared=0> for style 2: force deactivating <UISelectionFeedbackGenerator: 0x1c012d7a0: prepared=0> with style TurnOn which is not active (activationCount = -1) configuration: <_UISelectionFeedbackGeneratorConfiguration: 0x1c0301710: isEnabled=1, activationStyle=2, requiredSupportLevel=0> activationCount: -1, styleActivationCount: -1 engines: {( <_UIFeedbackHapticEngine: 0x1c40dd180: state=4, numberOfClients=5, prewarmCount=0, _isSuspended=0> )}

Here is the full report:

# Crashlytics - plaintext stacktrace downloaded by Sen Liu at Tue, 10   Oct 2017 22:21:10 GMT # URL: https://fabric.io/my-app/ios/apps/MyApp.MyApp/issues/59dd3fa2be077a4dcc13b10e?time=last-seven-days/sessions/a519bdec262e49e0be602410c090e407_6e21562fae0411e7918c56847afe9799_0_v2 # Organization: My Company # Platform: ios # Application: MyApp # Version: 0.9 (28) # Bundle Identifier: MyApp.MyApp # Issue #: 7 # Issue ID: 59dd3fa2be077a4dcc13b10e # Session ID: a519bdec262e49e0be602410c090e407_6e21562fae0411e7918c56847afe9799_0_v2 # Date: 2017-10-10T21:46:00Z # OS Version: 11.0.1 (15A402) # Device: iPhone 7 Plus # RAM Free: 5.8% # Disk Free: 2.5%  #0. Crashed: com.twitter.crashlytics.ios.exception 0  MyApp                    0x100ab1ec4 CLSProcessRecordAllThreads + 1572 1  MyApp                    0x100ab1ec4 CLSProcessRecordAllThreads + 1572 2  MyApp                    0x100ab1d80 CLSProcessRecordAllThreads + 1248 3  MyApp                    0x100aa1670 CLSHandler + 48 4  MyApp                    0x100aafcc0 __CLSExceptionRecord_block_invoke + 92 5  libdispatch.dylib              0x182ab5048 _dispatch_client_callout + 16 6  libdispatch.dylib              0x182abdae8 _dispatch_queue_barrier_sync_invoke_and_complete + 56 7  MyApp                    0x100aaf764 CLSExceptionRecord + 212 8  MyApp                    0x100aaf598 CLSExceptionRecordNSException + 548 9  MyApp                    0x100aaf1b8 CLSTerminateHandler() + 396 10 libc++abi.dylib                0x18263454c std::__terminate(void (*)()) + 16 11 libc++abi.dylib                0x1826345b8 std::terminate() + 60 12 libobjc.A.dylib                0x18264476c _destroyAltHandlerList + 10 13 libdispatch.dylib              0x182ab505c _dispatch_client_callout + 36 14 libdispatch.dylib              0x182abd3d4 _dispatch_continuation_pop$VARIANT$mp + 428 15 libdispatch.dylib              0x182ac6ca4 _dispatch_source_invoke$VARIANT$mp + 1588 16 libdispatch.dylib              0x182ac1a4c _dispatch_main_queue_callback_4CF$VARIANT$mp + 720 17 CoreFoundation                 0x1830d7f20 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12 18 CoreFoundation                 0x1830d5afc __CFRunLoopRun + 2012 19 CoreFoundation                 0x182ff62d8 CFRunLoopRunSpecific + 436 20 GraphicsServices               0x184e87f84 GSEventRunModal + 100 21 UIKit                          0x18c5a3880 UIApplicationMain + 208 22 MyApp                    0x10099a4cc main (AppDelegate.swift:16) 23 libdyld.dylib                  0x182b1a56c start + 4  --  Fatal Exception: NSInternalInconsistencyException 0  CoreFoundation                 0x18312fd38 __exceptionPreprocess 1  libobjc.A.dylib                0x182644528 objc_exception_throw 2  CoreFoundation                 0x18312fc80 -[NSException initWithCoder:] 3  UIKit                          0x18cf6b6d8 -[UIFeedbackGenerator _autoDeactivate] 4  UIKit                          0x18cf6b408 __48-[UIFeedbackGenerator _setupAutoDeactivateTimer]_block_invoke 5  libdispatch.dylib              0x182ab5048 _dispatch_client_callout 6  libdispatch.dylib              0x182abd3d4 _dispatch_continuation_pop$VARIANT$mp 7  libdispatch.dylib              0x182ac6ca4 _dispatch_source_invoke$VARIANT$mp 8  libdispatch.dylib              0x182ac1a4c _dispatch_main_queue_callback_4CF$VARIANT$mp 9  CoreFoundation                 0x1830d7f20 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ 10 CoreFoundation                 0x1830d5afc __CFRunLoopRun 11 CoreFoundation                 0x182ff62d8 CFRunLoopRunSpecific 12 GraphicsServices               0x184e87f84 GSEventRunModal 13 UIKit                          0x18c5a3880 UIApplicationMain 14 MyApp                    0x10099a4cc main (AppDelegate.swift:16) 15 libdyld.dylib                  0x182b1a56c start  #0. Crashed: com.twitter.crashlytics.ios.exception 0  MyApp                    0x100ab1ec4 CLSProcessRecordAllThreads + 1572 1  MyApp                    0x100ab1ec4 CLSProcessRecordAllThreads + 1572 2  MyApp                    0x100ab1d80 CLSProcessRecordAllThreads + 1248 3  MyApp                    0x100aa1670 CLSHandler + 48 4  MyApp                    0x100aafcc0 __CLSExceptionRecord_block_invoke + 92 5  libdispatch.dylib              0x182ab5048 _dispatch_client_callout + 16 6  libdispatch.dylib              0x182abdae8 _dispatch_queue_barrier_sync_invoke_and_complete + 56 7  MyApp                    0x100aaf764 CLSExceptionRecord + 212 8  MyApp                    0x100aaf598 CLSExceptionRecordNSException + 548 9  MyApp                    0x100aaf1b8 CLSTerminateHandler() + 396 10 libc++abi.dylib                0x18263454c std::__terminate(void (*)()) + 16 11 libc++abi.dylib                0x1826345b8 std::terminate() + 60 12 libobjc.A.dylib                0x18264476c _destroyAltHandlerList + 10 13 libdispatch.dylib              0x182ab505c _dispatch_client_callout + 36 14 libdispatch.dylib              0x182abd3d4 _dispatch_continuation_pop$VARIANT$mp + 428 15 libdispatch.dylib              0x182ac6ca4 _dispatch_source_invoke$VARIANT$mp + 1588 16 libdispatch.dylib              0x182ac1a4c _dispatch_main_queue_callback_4CF$VARIANT$mp + 720 17 CoreFoundation                 0x1830d7f20 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12 18 CoreFoundation                 0x1830d5afc __CFRunLoopRun + 2012 19 CoreFoundation                 0x182ff62d8 CFRunLoopRunSpecific + 436 20 GraphicsServices               0x184e87f84 GSEventRunModal + 100 21 UIKit                          0x18c5a3880 UIApplicationMain + 208 22 MyApp                    0x10099a4cc main (AppDelegate.swift:16) 23 libdyld.dylib                  0x182b1a56c start + 4  #1. Thread 0  libsystem_pthread.dylib        0x182d5ac2c start_wqthread + 122  #2. com.apple.uikit.eventfetch-thread 0  libsystem_kernel.dylib         0x182c28bc4 mach_msg_trap + 8 1  libsystem_kernel.dylib         0x182c28a3c mach_msg + 72 2  CoreFoundation                 0x1830d7ce4 __CFRunLoopServiceMachPort + 196 3  CoreFoundation                 0x1830d58b0 __CFRunLoopRun + 1424 4  CoreFoundation                 0x182ff62d8 CFRunLoopRunSpecific + 436 5  Foundation                     0x183a1e6e4 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304 6  Foundation                     0x183a3dafc -[NSRunLoop(NSRunLoop) runUntilDate:] + 96 7  UIKit                          0x18d0ef02c -[UIEventFetcher threadMain] + 136 8  Foundation                     0x183b1f860 __NSThread__start__ + 996 9  libsystem_pthread.dylib        0x182d5c32c _pthread_body + 308 10 libsystem_pthread.dylib        0x182d5c1f8 _pthread_body + 310 11 libsystem_pthread.dylib        0x182d5ac38 thread_start + 4  #3. com.twitter.crashlytics.ios.MachExceptionServer 0  libsystem_kernel.dylib         0x182c28bc4 mach_msg_trap + 8 1  libsystem_kernel.dylib         0x182c28a3c mach_msg + 72 2  MyApp                    0x100a9c17c CLSMachExceptionServer + 100 3  libsystem_pthread.dylib        0x182d5c32c _pthread_body + 308 4  libsystem_pthread.dylib        0x182d5c1f8 _pthread_body + 310 5  libsystem_pthread.dylib        0x182d5ac38 thread_start + 4  #4. Thread 0  libsystem_kernel.dylib         0x182c49dbc __workq_kernreturn + 8 1  libsystem_pthread.dylib        0x182d5afb0 _pthread_wqthread + 884 2  libsystem_pthread.dylib        0x182d5ac30 start_wqthread + 4  #5. Thread 0  libsystem_kernel.dylib         0x182c49dbc __workq_kernreturn + 8 1  libsystem_pthread.dylib        0x182d5afb0 _pthread_wqthread + 884 2  libsystem_pthread.dylib        0x182d5ac30 start_wqthread + 4  #6. com.apple.CFStream.LegacyThread 0  libsystem_kernel.dylib         0x182c28bc4 mach_msg_trap + 8 1  libsystem_kernel.dylib         0x182c28a3c mach_msg + 72 2  CoreFoundation                 0x1830d7ce4 __CFRunLoopServiceMachPort + 196 3  CoreFoundation                 0x1830d58b0 __CFRunLoopRun + 1424 4  CoreFoundation                 0x182ff62d8 CFRunLoopRunSpecific + 436 5  CoreFoundation                 0x1830e6f28 _legacyStreamRunLoop_workThread + 272 6  libsystem_pthread.dylib        0x182d5c32c _pthread_body + 308 7  libsystem_pthread.dylib        0x182d5c1f8 _pthread_body + 310 8  libsystem_pthread.dylib        0x182d5ac38 thread_start + 4  #7. com.apple.NSURLConnectionLoader 0  libsystem_kernel.dylib         0x182c28bc4 mach_msg_trap + 8 1  libsystem_kernel.dylib         0x182c28a3c mach_msg + 72 2  CoreFoundation                 0x1830d7ce4 __CFRunLoopServiceMachPort + 196 3  CoreFoundation                 0x1830d58b0 __CFRunLoopRun + 1424 4  CoreFoundation                 0x182ff62d8 CFRunLoopRunSpecific + 436 5  CFNetwork                      0x18375fb40 +[NSURLConnection(Loader) _resourceLoadLoop:] + 404 6  Foundation                     0x183b1f860 __NSThread__start__ + 996 7  libsystem_pthread.dylib        0x182d5c32c _pthread_body + 308 8  libsystem_pthread.dylib        0x182d5c1f8 _pthread_body + 310 9  libsystem_pthread.dylib        0x182d5ac38 thread_start + 4  #8. com.apple.CFSocket.private 0  libsystem_kernel.dylib         0x182c49570 __select + 8 1  CoreFoundation                 0x1830e021c __CFSocketManager + 644 2  libsystem_pthread.dylib        0x182d5c32c _pthread_body + 308 3  libsystem_pthread.dylib        0x182d5c1f8 _pthread_body + 310 4  libsystem_pthread.dylib        0x182d5ac38 thread_start + 4  #9. AVAudioSession Notify Thread 0  libsystem_kernel.dylib         0x182c28bc4 mach_msg_trap + 8 1  libsystem_kernel.dylib         0x182c28a3c mach_msg + 72 2  CoreFoundation                 0x1830d7ce4 __CFRunLoopServiceMachPort + 196 3  CoreFoundation                 0x1830d58b0 __CFRunLoopRun + 1424 4  CoreFoundation                 0x182ff62d8 CFRunLoopRunSpecific + 436 5  AVFAudio                       0x1888bf774 GenericRunLoopThread::Entry(void*) + 164 6  AVFAudio                       0x1888ea018 CAPThread::Entry(CAPThread*) + 84 7  libsystem_pthread.dylib        0x182d5c32c _pthread_body + 308 8  libsystem_pthread.dylib        0x182d5c1f8 _pthread_body + 310 9  libsystem_pthread.dylib        0x182d5ac38 thread_start + 4  #10. Thread 0  libsystem_kernel.dylib         0x182c49dbc __workq_kernreturn + 8 1  libsystem_pthread.dylib        0x182d5b144 _pthread_wqthread + 1288 2  libsystem_pthread.dylib        0x182d5ac30 start_wqthread + 4 

Answer 1

I have the same problem, you can check the following steps:

1. cd to your project's root path

2. Run

   grep -r UIFeedbackGenerator . 

Then you will find which library is using UIFeedbackGenerator.

Hope this will help you.