There are 1–3 crashes in my app that appear to be uncommon race circumstances. They occurred to date to a couple a whole bunch customers of mine. I can’t reproduce them and don’t have any clues by any means about their trigger. For instance:
Crashed: com.apple.main-thread
0 libsystem_kernel.dylib 0xc2d4 __pthread_kill + 8
1 libsystem_pthread.dylib 0x859c pthread_kill + 268
2 libsystem_c.dylib 0x77b08 abort + 128
3 libswiftCore.dylib 0x3ccae4 swift::fatalError(unsigned int, char const*, ...) + 134
4 libswiftCore.dylib 0x3ccb04 swift::warningv(unsigned int, char const*, char*) + 30
5 libswiftCore.dylib 0x3c66cc tryCastFromClassToObjCBridgeable(swift::OpaqueValue*, swift::TargetMetadata<swift::InProcess> const*, swift::OpaqueValue*, swift::TargetMetadata<swift::InProcess> const*, swift::TargetMetadata<swift::InProcess> const*&, swift::TargetMetadata<swift::InProcess> const*&, bool, bool) + 254
6 libswiftCore.dylib 0x3c8408 tryCastToObjectiveCClass(swift::OpaqueValue*, swift::TargetMetadata<swift::InProcess> const*, swift::OpaqueValue*, swift::TargetMetadata<swift::InProcess> const*, swift::TargetMetadata<swift::InProcess> const*&, swift::TargetMetadata<swift::InProcess> const*&, bool, bool) + 88
7 libswiftCore.dylib 0x3c5d30 tryCast(swift::OpaqueValue*, swift::TargetMetadata<swift::InProcess> const*, swift::OpaqueValue*, swift::TargetMetadata<swift::InProcess> const*, swift::TargetMetadata<swift::InProcess> const*&, swift::TargetMetadata<swift::InProcess> const*&, bool, bool) + 992
8 libswiftCore.dylib 0x3c57dc swift_dynamicCast + 208
9 SwiftUI 0x91540 PlatformViewHost.updateNestedHosts(_:colorSchemeChanged:) + 332
10 SwiftUI 0x91110 PlatformViewHost.updateEnvironment(_:viewPhase:) + 272
11 SwiftUI 0x27f148 specialised PlatformViewHost.init(_:host:atmosphere:viewPhase:importer:) + 1288
12 SwiftUI 0x27ec28 specialised PlatformViewHost.__allocating_init(_:host:atmosphere:viewPhase:importer:) + 92
13 SwiftUI 0x27eb88 closure #1 in closure #1 in closure #4 in closure #1 in PlatformViewChild.updateValue() + 504
14 SwiftUI 0x27e984 partial apply for closure #1 in closure #1 in closure #4 in closure #1 in PlatformViewChild.updateValue() + 48
15 SwiftUI 0x27e90c RepresentableContextValues.asCurrent<A>(do:) + 188
16 SwiftUI 0x27e804 closure #1 in closure #4 in closure #1 in PlatformViewChild.updateValue() + 176
17 SwiftUI 0x27e72c partial apply for closure #4 in closure #1 in PlatformViewChild.updateValue() + 128
18 SwiftUICore 0x1640c partial apply for closure #1 in _withObservation<A>(do:) + 48
19 SwiftUICore 0x14148 closure #1 in _withObservation<A>(do:)partial apply + 16
20 SwiftUICore 0x128c8 withUnsafeMutablePointer<A, B, C>(to:_:) + 160
21 SwiftUICore 0x7c08c StatefulRule.withObservation<A>(do:) + 872
22 SwiftUICore 0x7bb8c StatefulRule.withObservation<A>(do:) + 72
23 SwiftUI 0x8f374 closure #1 in PlatformViewChild.updateValue() + 3312
24 SwiftUICore 0x204360 Signpost.traceInterval<A>(object:_:_:closure:) + 452
25 SwiftUI 0x791ac PlatformViewChild.updateValue() + 176
26 SwiftUI 0x78414 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32
27 AttributeGraph 0xccac AG::Graph::UpdateStack::replace() + 540
28 AttributeGraph 0xc870 AG::Graph::update_attribute(AG::information::ptr<AG::Node>, unsigned int) + 424
29 AttributeGraph 0x3bf4 AG::Graph::input_value_ref_slow(AG::information::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, lengthy) + 720
30 AttributeGraph 0x3794 AGGraphGetValue + 228
31 SwiftUI 0x20b90 InvalidatableLeafLayoutComputer.view.getter + 60
32 SwiftUI 0x363878 RemoteSheetContainerVCWriter.worth.getter + 404
33 SwiftUI 0x360e0 implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 324
34 AttributeGraph 0xccac AG::Graph::UpdateStack::replace() + 540
35 AttributeGraph 0xc870 AG::Graph::update_attribute(AG::information::ptr<AG::Node>, unsigned int) + 424
36 AttributeGraph 0x3bf4 AG::Graph::input_value_ref_slow(AG::information::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, lengthy) + 720
37 AttributeGraph 0x3794 AGGraphGetValue + 228
38 SwiftUICore 0xae908 closure #1 in PairPreferenceCombiner.worth.getter + 84
39 SwiftUI 0x1ade44 protocol witness for static PreferenceKey.scale back(worth:nextValue:) in conformance RemoteSheetContainerVCKey + 160
40 SwiftUICore 0xada80 PairPreferenceCombiner.worth.getter + 216
41 SwiftUICore 0x4cb0 implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 324
42 AttributeGraph 0xccac AG::Graph::UpdateStack::replace() + 540
43 AttributeGraph 0xc870 AG::Graph::update_attribute(AG::information::ptr<AG::Node>, unsigned int) + 424
44 AttributeGraph 0xbfd4 AG::Graph::value_ref(AG::AttributeID, unsigned int, AGSwiftMetadata const*, unsigned char&) + 288
45 AttributeGraph 0x37e4 AGGraphGetValue + 308
46 SwiftUI 0x31d664 closure #1 in PresentationHostingController._remoteSheet.getter + 96
47 SwiftUI 0x31d5fc partial apply for closure #1 in PresentationHostingController._remoteSheet.getter + 20
48 SwiftUICore 0x79184 closure #1 in static Replace.guarantee<A>(_:) + 56
49 SwiftUICore 0x79108 static Replace.guarantee<A>(_:) + 100
50 SwiftUI 0x31d860 PresentationHostingController._remoteSheet.getter + 264
51 SwiftUI 0x31d730 @objc PresentationHostingController._remoteSheet.getter + 28
52 UIKitCore 0x356b20 -[UISheetPresentationController _expectedRemoteSheet] + 244
53 UIKitCore 0x3553b0 -[UISheetPresentationController presentationTransitionWillBegin] + 1124
54 UIKitCore 0x36d4cc -[_UIFormSheetPresentationController presentationTransitionWillBegin] + 56
55 UIKitCore 0x36bd5c __80-[UIPresentationController _initViewHierarchyForPresentationSuperview:inWindow:]_block_invoke + 2136
56 UIKitCore 0x3111c4 __77-[UIPresentationController runTransitionForCurrentStateAnimated:handoffData:]_block_invoke_3 + 304
57 UIKitCore 0x9fd40 -[_UIAfterCACommitBlock run] + 72
58 UIKitCore 0x9f894 -[_UIAfterCACommitQueue flush] + 164
59 UIKitCore 0x9f7a8 _runAfterCACommitDeferredBlocks + 260
60 UIKitCore 0x9f4c8 _cleanUpAfterCAFlushAndRunDeferredBlocks + 80
61 UIKitCore 0x9f3d8 _UIApplicationFlushCATransaction + 72
62 UIKitCore 0x9c890 __setupUpdateSequence_block_invoke_2 + 332
63 UIKitCore 0x9c704 _UIUpdateSequenceRun + 84
64 UIKitCore 0x9f034 schedulerStepScheduledMainSection + 172
65 UIKitCore 0x9cc50 runloopSourceCallback + 92
66 CoreFoundation 0x73f3c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28
67 CoreFoundation 0x73ed0 __CFRunLoopDoSource0 + 176
68 CoreFoundation 0x76b30 __CFRunLoopDoSources0 + 244
69 CoreFoundation 0x75d2c __CFRunLoopRun + 840
70 CoreFoundation 0xc8274 CFRunLoopRunSpecific + 588
71 GraphicsServices 0x14c0 GSEventRunModal + 164
72 UIKitCore 0x3ee77c -[UIApplication _run] + 816
73 UIKitCore 0x14e64 UIApplicationMain + 340
74 SwiftUI 0x292660 closure #1 in KitRendererCommon(_:) + 168
75 SwiftUI 0x292590 runApp<A>(_:) + 100
76 SwiftUI 0x292474 static App.important() + 180
77 MyApp 0x19d82c important + 4335982636 (MyApp.swift:4335982636)
78 ??? 0x1adb84de8 (Lacking)
There’s no reference to any particular code of mine — no clues in any respect.
AFAIK, I’m following greatest practices, comparable to manipulating SwiftUI state solely on the principle thread, utilizing actors the place acceptable, and so forth.
What’s the proper technique to analyze and handle such errors? How does Apple count on us to deal with them? They appear utterly inactionable.
