In-App Messaging autolayout from background thread crash #4124
Description
[READ] Step 1: Are you in the right place?
YES
[REQUIRED] Step 2: Describe your environment
- Xcode version: 11.1
- Firebase SDK version: 6.10
- Firebase Component: InAppMessaging
- Component version: I'm using the Carthage version 6.10 not sure about component version.
[REQUIRED] Step 3: Describe the problem
Steps to reproduce:
I created and deployed my first In-App Message dialog. When I tested the campaign on my device I started to experience crash shortly after the app launches.
Nothing in the stack trace below is from my code, it's all from the Firebase SDK.
Relevant Code:
No client side code
Stack Trace:
2019-10-20 00:44:25.533320+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM900014] No fetch epoch time detected in API response.
2019-10-20 00:44:25.533468+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM900008] A test message with id 5459849288093794304 was parsed successfully.
2019-10-20 00:44:25.533634+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM900002] 2 message definitions were parsed out successfully and 0 messages are discarded
2019-10-20 00:44:25.533756+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM130012] API request for fetching messages and parsing the response was successful.
2019-10-20 00:44:25.533955+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM700004] 2 messages were fetched successfully.
2019-10-20 00:44:25.534052+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM270005] No impression records update due to no change after applying the server message list
2019-10-20 00:44:25.534180+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM150004] Persistent file path for fetch response data is /Users/01143870/Library/Developer/CoreSimulator/Devices/9F38FFAA-FA6C-47C2-8DEE-DCA229D6B410/data/Containers/Data/Application/0827E197-C6C9-4646-BB73-F42F896613AB/Library/Caches/firebase-iam-messages-cache
2019-10-20 00:44:25.549062+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM160010] There are analytics event trigger based messages, enable listening
2019-10-20 00:44:25.549185+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM140002] Start observing Firebase Analytics events for rendering messages.
2019-10-20 00:44:25.549289+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM160001] There are 1 test messages and 1 regular messages and 2 Firebase Analytics events to watch after resetting the message cache
2019-10-20 00:44:25.549357+0800 Circle[57637:1636117] 6.10.0 - [Firebase/InAppMessaging][I-IAM240002] Fetch is done. Start message rendering flow.
2019-10-20 00:44:26.082667+0800 Circle[57637:1636869] 6.10.0 - [Firebase/InAppMessaging][I-IAM160007] Returning a test message for app foreground display
2019-10-20 00:44:26.334395+0800 Circle[57637:1635929] 6.10.0 - [Firebase/Analytics][I-ACS002001] Measurement timer fired
2019-10-20 00:44:26.334621+0800 Circle[57637:1635929] 6.10.0 - [Firebase/Analytics][I-ACS002003] Measurement timer canceled
2019-10-20 00:44:26.334826+0800 Circle[57637:1635929] 6.10.0 - [Firebase/Analytics][I-ACS023033] Starting data upload
2019-10-20 00:44:26.335690+0800 Circle[57637:1635929] 6.10.0 - [Firebase/Analytics][I-ACS023105] Event is not subject to real-time event count daily limit. Marking an event as real-time. Event name, parameters: display_screen, {
action = display_screen;
condition = location=global&gender=all&recency=alltime;
displayed_at = 2019/10/20 00:44:25 +0800;
ga_debug (_dbg) = 1;
ga_event_origin (_o) = app;
ga_realtime (_r) = 1;
screen_name = Explore;
source = background;
}
2019-10-20 00:44:26.336885+0800 Circle[57637:1635929] 6.10.0 - [Firebase/Analytics][I-ACS012018] Saving bundle. size (bytes): 566
2019-10-20 00:44:26.337065+0800 Circle[57637:1635929] 6.10.0 - [Firebase/Analytics][I-ACS023116] Bundle added to the upload queue. BundleID, timestamp (ms): 321, 1571503465306
2019-10-20 00:44:26.338647+0800 Circle[57637:1636869] 6.10.0 - [Firebase/Analytics][I-ACS023038] Uploading events. Elapsed time since last successful upload (s): 2.299102067947388
2019-10-20 00:44:26.338759+0800 Circle[57637:1636869] 6.10.0 - [Firebase/Analytics][I-ACS023039] Measurement data sent to network. Timestamp (ms), data: 1571503466338, <APMPBMeasurementBatch: 0x600002b3efd0>
2019-10-20 00:44:26.341859+0800 Circle[57637:1636869] 6.10.0 - [Firebase/Analytics][I-ACS900000] Uploading data. Host: https://app-measurement.com/a
2019-10-20 00:44:26.780083+0800 Circle[57637:1636867] 6.10.0 - [Firebase/Analytics][I-ACS901006] Received SSL challenge for host. Host: https://app-measurement.com/a
2019-10-20 00:44:26.869967+0800 Circle[57637:1636870] 6.10.0 - [Firebase/InAppMessaging][I-IAM000004] No image MIME type text/html detected for URL https://www.uniqlo.com/jp/store/goods/419285-67
2019-10-20 00:44:26.870311+0800 Circle[57637:1636870] 6.10.0 - [Firebase/InAppMessaging][I-IAM400019] Error in loading image data for the message.
2019-10-20 00:44:26.870630+0800 Circle[57637:1636870] 6.10.0 - [Firebase/InAppMessaging][I-IAM400009] Display ran into error for message 5459849288093794304: Error Domain=com.firebase.inappmessaging Code=1 "No image MIME type text/html detected for URL https://www.uniqlo.com/jp/store/goods/419285-67" UserInfo={NSLocalizedDescription=No image MIME type text/html detected for URL https://www.uniqlo.com/jp/store/goods/419285-67}
2019-10-20 00:44:26.870986+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.871210+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.871379+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.871576+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.871754+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.871921+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.891412+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.891544+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.891689+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.891915+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.892087+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.892487+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.892636+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.899940+0800 Circle[57637:1636868] [Animation] +[UIView setAnimationsEnabled:] being called from a background thread. Performing any operation from a background thread on UIView or a subclass is not supported and may result in unexpected and insidious behavior. trace=(
0 UIKitCore 0x00007fff47a44b5d kFixedAnimationDuration_block_invoke_3 + 119
1 libdispatch.dylib 0x000000010c0e7d6c _dispatch_client_callout + 8
2 libdispatch.dylib 0x000000010c0e92bb _dispatch_once_callout + 66
3 UIKitCore 0x00007fff47a44ae4 +[UIView(Animation) setAnimationsEnabled:] + 62
4 UIKitCore 0x00007fff47a44c38 +[UIView(Animation) performWithoutAnimation:] + 78
5 UIKitCore 0x00007fff47959081 -[UIStackView _commonStackViewInitializationWithArrangedSubviews:] + 122
6 UIKitCore 0x00007fff47958fcf -[UIStackView initWithFrame:] + 103
7 UIKitCore 0x00007fff46b0c711 -[_UIInterfaceActionSeparatableSequenceView initWithVisualStyle:] + 351
8 UIKitCore 0x00007fff46b0bb74 -[_UIInterfaceActionRepresentationsSequenceView initWithVisualStyle:] + 328
9 UIKitCore 0x00007fff46afa7f7 -[UIInterfaceActionGroupView _loadActionSequenceView] + 79
10 UIKitCore 0x00007fff46af7efe -[UIInterfaceActionGroupView _commonInitWithActionGroup:visualStyleProvider:actionHandlerInvocationDelegate:] + 522
11 UIKitCore 0x00007fff46af7fd3 -[UIInterfaceActionGroupView initWithActionGroup:actionHandlerInvocationDelegate:] + 138
12 UIKitCore 0x00007fff46b2341f -[_UIAlertControllerInterfaceActionGroupView initWithAlertController:actionGroup:actionHandlerInvocationDelegate:] + 87
13 UIKitCore 0x00007fff46b43dd1 -[_UIAlertControllerView _prepareMainInterfaceActionsGroupView] + 150
14 UIKitCore 0x00007fff46b430d6 -[_UIAlertControllerView _prepareViewsAndAddConstraints] + 40
15 UIKitCore 0x00007fff46b43071 -[_UIAlertControllerView setAlertController:] + 93
16 UIKitCore 0x00007fff46b2c572 -[UIAlertController loadView] + 81
17 UIKitCore 0x00007fff46f0895f -[UIViewController loadViewIfRequired] + 172
18 UIKitCore 0x00007fff46f0910c -[UIViewController view] + 27
19 UIKitCore 0x00007fff46f2038e -[UIViewController _setPresentationController:] + 100
20 UIKitCore 0x00007fff46f18b9a -[UIViewController _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 1256
21 UIKitCore 0x00007fff46f1a602 -[UIViewController _presentViewController:withAnimationController:completion:] + 4325
22 UIKitCore 0x00007fff46f1ce7b __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 98
23 UIKitCore 0x00007fff46f1d393 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 511
24 UIKitCore 0x00007fff46f1cdd9 -[UIViewController _presentViewController:animated:completion:] + 187
25 UIKitCore 0x00007fff46f1d040 -[UIViewController presentViewController:animated:completion:] + 150
26 Circle 0x0000000108151cdb -[FIRIAMDisplayExecutor displayMessageLoadError:] + 407
27 Circle 0x0000000108151758 -[FIRIAMDisplayExecutor displayErrorForMessage:error:] + 509
28 Circle 0x000000010815337f __55-[FIRIAMDisplayExecutor displayForMessage:triggerType:]_block_invoke + 164
29 Circle 0x00000001081598eb __63-[FIRIAMMessageContentDataWithImageURL loadImageDataWithBlock:]_block_invoke.21 + 158
30 Circle 0x000000010815a17c __68-[FIRIAMMessageContentDataWithImageURL fetchImageFromURL:withBlock:]_block_invoke + 1258
31 CFNetwork 0x00007fff22d05a26 CFNetwork + 35366
32 CFNetwork 0x00007fff22d1887a _CFHTTPMessageSetResponseProxyURL + 16819
33 Foundation 0x00007fff2567de0f __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
34 Foundation 0x00007fff2567dd07 -[NSBlockOperation main] + 98
35 Foundation 0x00007fff25680c94 __NSOPERATION_IS_INVOKING_MAIN__ + 17
36 Foundation 0x00007fff2567cf07 -[NSOperation start] + 731
37 Foundation 0x00007fff256815ee __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 17
38 Foundation 0x00007fff256810f8 __NSOQSchedule_f + 182
39 libdispatch.dylib 0x000000010c0f6407 _dispatch_block_async_invoke2 + 83
40 libdispatch.dylib 0x000000010c0e7d6c _dispatch_client_callout + 8
41 libdispatch.dylib 0x000000010c0ea6de _dispatch_continuation_pop + 552
42 libdispatch.dylib 0x000000010c0e9ae9 _dispatch_async_redirect_invoke + 849
43 libdispatch.dylib 0x000000010c0f92a2 _dispatch_root_queue_drain + 351
44 libdispatch.dylib 0x000000010c0f9bac _dispatch_worker_thread2 + 132
45 libsystem_pthread.dylib 0x00007fff518d171d _pthread_wqthread + 220
46 libsystem_pthread.dylib 0x00007fff518d15c3 start_wqthread + 15
)
2019-10-20 00:44:26.904184+0800 Circle[57637:1636868] [Assert] Unsupported use of UIKit view-customization API off the main thread. -setHasDimmingView: sent to <_UIAlertControllerView: 0x7fa42553b440; frame = (0 0; 375 812); layer = <CALayer: 0x60000296f7a0>>
2019-10-20 00:44:26.904363+0800 Circle[57637:1636868] [Assert] Unsupported use of UIKit view-customization API off the main thread. -setShouldHaveBackdropView: sent to <_UIAlertControllerView: 0x7fa42553b440; frame = (0 0; 375 812); layer = <CALayer: 0x60000296f7a0>>
2019-10-20 00:44:26.904528+0800 Circle[57637:1636868] [Assert] Cannot be called with asCopy = NO on non-main thread.
2019-10-20 00:44:26.904677+0800 Circle[57637:1636868] [Assert] Unsupported use of UIKit view-customization API off the main thread. -setAlignsToKeyboard: sent to <_UIAlertControllerView: 0x7fa42553b440; frame = (0 0; 375 812); layer = <CALayer: 0x60000296f7a0>>
2019-10-20 00:44:26.910635+0800 Circle[57637:1636868] This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.
Stack:(
0 Foundation 0x00007fff25802dbf _AssertAutolayoutOnAllowedThreadsOnly + 175
1 Foundation 0x00007fff25803500 -[NSISEngine withBehaviors:performModifications:] + 25
2 UIKitCore 0x00007fff4796d3a8 -[UIView(UIConstraintBasedLayout) _calculatedSystemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:hasIntentionallyCollapsedHeight:] + 1198
3 UIKitCore 0x00007fff4796e839 -[UIView(AdditionalLayoutSupport) _systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:hasIntentionallyCollapsedHeight:] + 694
4 UIKitCore 0x00007fff46b4aec4 -[_UIAlertControllerView _minimumSizeForAllActions] + 593
5 UIKitCore 0x00007fff46b464a2 -[_UIAlertControllerView _itemSizeForHorizontalLayout:visualStyleRequiresActionRepresentationToFitItemSize:] + 36
6 UIKitCore 0x00007fff46b4672f -[_UIAlertControllerView _canLayOutActionsHorizontally] + 95
7 UIKitCore 0x00007fff46b469f5 -[_UIAlertControllerView _actionLayoutDirectionChanged] + 51
8 UIKitCore 0x00007fff46b4b686 -[_UIAlertControllerView _updateStyleForIdiomChange:] + 224
9 UIKitCore 0x00007fff46b4b509 -[_UIAlertControllerView _setVisualStyle:] + 282
10 UIKitCore 0x00007fff46b2c6ae -[UIAlertController loadView] + 397
11 UIKitCore 0x00007fff46f0895f -[UIViewController loadViewIfRequired] + 172
12 UIKitCore 0x00007fff46f0910c -[UIViewController view] + 27
13 UIKitCore 0x00007fff46f2038e -[UIViewController _setPresentationController:] + 100
14 UIKitCore 0x00007fff46f18b9a -[UIViewController _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 1256
15 UIKitCore 0x00007fff46f1a602 -[UIViewController _presentViewController:withAnimationController:completion:] + 4325
16 UIKitCore 0x00007fff46f1ce7b __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 98
17 UIKitCore 0x00007fff46f1d393 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 511
18 UIKitCore 0x00007fff46f1cdd9 -[UIViewController _presentViewController:animated:completion:] + 187
19 UIKitCore 0x00007fff46f1d040 -[UIViewController presentViewController:animated:completion:] + 150
20 Circle 0x0000000108151cdb -[FIRIAMDisplayExecutor displayMessageLoadError:] + 407
21 Circle 0x0000000108151758 -[FIRIAMDisplayExecutor displayErrorForMessage:error:] + 509
22 Circle 0x000000010815337f __55-[FIRIAMDisplayExecutor displayForMessage:triggerType:]_block_invoke + 164
23 Circle 0x00000001081598eb __63-[FIRIAMMessageContentDataWithImageURL loadImageDataWithBlock:]_block_invoke.21 + 158
24 Circle 0x000000010815a17c __68-[FIRIAMMessageContentDataWithImageURL fetchImageFromURL:withBlock:]_block_invoke + 1258
25 CFNetwork 0x00007fff22d05a26 CFNetwork + 35366
26 CFNetwork 0x00007fff22d1887a _CFHTTPMessageSetResponseProxyURL + 16819
27 Foundation 0x00007fff2567de0f __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
28 Foundation 0x00007fff2567dd07 -[NSBlockOperation main] + 98
29 Foundation 0x00007fff25680c94 __NSOPERATION_IS_INVOKING_MAIN__ + 17
30 Foundation 0x00007fff2567cf07 -[NSOperation start] + 731
31 Foundation 0x00007fff256815ee __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 17
32 Foundation 0x00007fff256810f8 __NSOQSchedule_f + 182
33 libdispatch.dylib 0x000000010c0f6407 _dispatch_block_async_invoke2 + 83
34 libdispatch.dylib 0x000000010c0e7d6c _dispatch_client_callout + 8
35 libdispatch.dylib 0x000000010c0ea6de _dispatch_continuation_pop + 552
36 libdispatch.dylib 0x000000010c0e9ae9 _dispatch_async_redirect_invoke + 849
37 libdispatch.dylib 0x000000010c0f92a2 _dispatch_root_queue_drain + 351
38 libdispatch.dylib 0x000000010c0f9bac _dispatch_worker_thread2 + 132
39 libsystem_pthread.dylib 0x00007fff518d171d _pthread_wqthread + 220
40 libsystem_pthread.dylib 0x00007fff518d15c3 start_wqthread + 15
)
2019-10-20 00:44:26.916928+0800 Circle[57637:1636868] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread.'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff23baa1ee __exceptionPreprocess + 350
1 libobjc.A.dylib 0x00007fff50864b20 objc_exception_throw + 48
2 Foundation 0x00007fff25802e3c -[NSISEngine tryToOptimizeReturningMutuallyExclusiveConstraints] + 0
3 Foundation 0x00007fff25803500 -[NSISEngine withBehaviors:performModifications:] + 25
4 UIKitCore 0x00007fff4796d3a8 -[UIView(UIConstraintBasedLayout) _calculatedSystemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:hasIntentionallyCollapsedHeight:] + 1198
5 UIKitCore 0x00007fff4796e839 -[UIView(AdditionalLayoutSupport) _systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:hasIntentionallyCollapsedHeight:] + 694
6 UIKitCore 0x00007fff46b4aec4 -[_UIAlertControllerView _minimumSizeForAllActions] + 593
7 UIKitCore 0x00007fff46b464a2 -[_UIAlertControllerView _itemSizeForHorizontalLayout:visualStyleRequiresActionRepresentationToFitItemSize:] + 36
8 UIKitCore 0x00007fff46b4672f -[_UIAlertControllerView _canLayOutActionsHorizontally] + 95
9 UIKitCore 0x00007fff46b469f5 -[_UIAlertControllerView _actionLayoutDirectionChanged] + 51
10 UIKitCore 0x00007fff46b4b686 -[_UIAlertControllerView _updateStyleForIdiomChange:] + 224
11 UIKitCore 0x00007fff46b4b509 -[_UIAlertControllerView _setVisualStyle:] + 282
12 UIKitCore 0x00007fff46b2c6ae -[UIAlertController loadView] + 397
13 UIKitCore 0x00007fff46f0895f -[UIViewController loadViewIfRequired] + 172
14 UIKitCore 0x00007fff46f0910c -[UIViewController view] + 27
15 UIKitCore 0x00007fff46f2038e -[UIViewController _setPresentationController:] + 100
16 UIKitCore 0x00007fff46f18b9a -[UIViewController _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 1256
17 UIKitCore 0x00007fff46f1a602 -[UIViewController _presentViewController:withAnimationController:completion:] + 4325
18 UIKitCore 0x00007fff46f1ce7b __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 98
19 UIKitCore 0x00007fff46f1d393 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 511
20 UIKitCore 0x00007fff46f1cdd9 -[UIViewController _presentViewController:animated:completion:] + 187
21 UIKitCore 0x00007fff46f1d040 -[UIViewController presentViewController:animated:completion:] + 150
22 Circle 0x0000000108151cdb -[FIRIAMDisplayExecutor displayMessageLoadError:] + 407
23 Circle 0x0000000108151758 -[FIRIAMDisplayExecutor displayErrorForMessage:error:] + 509
24 Circle 0x000000010815337f __55-[FIRIAMDisplayExecutor displayForMessage:triggerType:]_block_invoke + 164
25 Circle 0x00000001081598eb __63-[FIRIAMMessageContentDataWithImageURL loadImageDataWithBlock:]_block_invoke.21 + 158
26 Circle 0x000000010815a17c __68-[FIRIAMMessageContentDataWithImageURL fetchImageFromURL:withBlock:]_block_invoke + 1258
27 CFNetwork 0x00007fff22d05a26 CFNetwork + 35366
28 CFNetwork 0x00007fff22d1887a _CFHTTPMessageSetResponseProxyURL + 16819
29 Foundation 0x00007fff2567de0f __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
30 Foundation 0x00007fff2567dd07 -[NSBlockOperation main] + 98
31 Foundation 0x00007fff25680c94 __NSOPERATION_IS_INVOKING_MAIN__ + 17
32 Foundation 0x00007fff2567cf07 -[NSOperation start] + 731
33 Foundation 0x00007fff256815ee __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 17
34 Foundation 0x00007fff256810f8 __NSOQSchedule_f + 182
35 libdispatch.dylib 0x000000010c0f6407 _dispatch_block_async_invoke2 + 83
36 libdispatch.dylib 0x000000010c0e7d6c _dispatch_client_callout + 8
37 libdispatch.dylib 0x000000010c0ea6de _dispatch_continuation_pop + 552
38 libdispatch.dylib 0x000000010c0e9ae9 _dispatch_async_redirect_invoke + 849
39 libdispatch.dylib 0x000000010c0f92a2 _dispatch_root_queue_drain + 351
40 libdispatch.dylib 0x000000010c0f9bac _dispatch_worker_thread2 + 132
41 libsystem_pthread.dylib 0x00007fff518d171d _pthread_wqthread + 220
42 libsystem_pthread.dylib 0x00007fff518d15c3 start_wqthread + 15
)