I'm using SwiftData & SwiftUI and my App keeps crashing in the background. I sadly can't reproduce it, I'm only seeing the TestFlight crash reports.
Background fetch and/or Remote Notifications (for CloudKit) on leads to the issue; only if I turn off both is the issue goneBackground fetch, even if I don't add any code to run in the background (so no .backgroundTask, no task scheduling via BGAppRefreshTaskRequest) the App is still crashing, so it doesn't seem to matter what or if I do anything in the background myselfException Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x000000019dd618c0
Termination Reason: SIGNAL 5 Trace/BPT trap: 5
Terminating Process: exc handler [622]
Triggered by Thread: 0
Thread 0 name:
Thread 0 Crashed:
0 libswiftCore.dylib 0x000000019dd618c0 _assertionFailure(_:_:file:line:flags:) + 264 (AssertCommon.swift:144)
1 libswiftCore.dylib 0x000000019ddcfd14 swift_unexpectedError + 664 (ErrorType.swift:188)
2 _SwiftData_SwiftUI 0x000000023fd20d78 one-time initialization function for empty + 300 (ModelContainer+Extensions.swift:5)
3 libdispatch.dylib 0x00000001a7312dd4 _dispatch_client_callout + 20 (object.m:576)
4 libdispatch.dylib 0x00000001a7314654 _dispatch_once_callout + 32 (once.c:52)
5 _SwiftData_SwiftUI 0x000000023fd20df8 one-time initialization function for empty + 124 (ModelContainer+Extensions.swift:12)
6 libdispatch.dylib 0x00000001a7312dd4 _dispatch_client_callout + 20 (object.m:576)
7 libdispatch.dylib 0x00000001a7314654 _dispatch_once_callout + 32 (once.c:52)
8 _SwiftData_SwiftUI 0x000000023fd36170 key path getter for EnvironmentValues.modelContext : EnvironmentValues + 140 (<compiler-generated>:0)
9 libswiftCore.dylib 0x000000019de8c628 RawKeyPathComponent._projectReadOnly<A, B, C>(_:to:endingWith:) + 1012 (KeyPath.swift:1701)
10 libswiftCore.dylib 0x000000019de8bddc KeyPath._projectReadOnly(from:) + 1036 (KeyPath.swift:331)
11 libswiftCore.dylib 0x000000019de90348 swift_getAtKeyPath + 24 (KeyPath.swift:2029)
12 SwiftUI 0x00000001a3c9c814 EnvironmentBox.update(property:phase:) + 872 (Environment.swift:273)
13 SwiftUI 0x00000001a39d2074 static BoxVTable.update(ptr:property:phase:) + 396 (DynamicPropertyBuffer.swift:294)
14 SwiftUI 0x00000001a39d17b0 _DynamicPropertyBuffer.update(container:phase:) + 104 (DynamicPropertyBuffer.swift:215)
15 SwiftUI 0x00000001a4a27b78 closure #1 in closure #1 in DynamicBody.updateValue() + 104 (DynamicProperty.swift:447)
16 SwiftUI 0x00000001a4a27bb8 partial apply for closure #1 in closure #1 in DynamicBody.updateValue() + 28 (<compiler-generated>:0)
17 libswiftCore.dylib 0x000000019dd74068 withUnsafeMutablePointer<A, B>(to:_:) + 28 (LifetimeManager.swift:82)
18 SwiftUI 0x00000001a4a279dc closure #1 in DynamicBody.updateValue() + 408 (DynamicProperty.swift:446)
19 SwiftUI 0x00000001a4a275c0 DynamicBody.updateValue() + 712 (DynamicProperty.swift:445)
20 SwiftUI 0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
21 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
22 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
23 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
24 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
25 SwiftUI 0x00000001a4a27548 DynamicBody.updateValue() + 592 (DynamicProperty.swift:444)
26 SwiftUI 0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
27 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
28 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
29 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
30 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
31 SwiftUI 0x00000001a44b73ac Attribute.syncMainIfReferences<A>(do:) + 236 (AttributeGraphAdditions.swift:84)
32 SwiftUI 0x00000001a42cd0f8 closure #1 in GeometryReader.Child.updateValue() + 108 (GeometryReader.swift:85)
33 SwiftUI 0x00000001a42ce8ac partial apply for closure #1 in GeometryReader.Child.updateValue() + 24 (<compiler-generated>:0)
34 SwiftUI 0x00000001a3c1f7d0 closure #1 in _withObservation<A>(do:) + 44 (ObservationUtils.swift:26)
35 SwiftUI 0x00000001a42ce8cc partial apply for closure #1 in _withObservation<A>(do:) + 24 (<compiler-generated>:0)
36 libswiftCore.dylib 0x000000019dd74068 withUnsafeMutablePointer<A, B>(to:_:) + 28 (LifetimeManager.swift:82)
37 SwiftUI 0x00000001a42ccd88 GeometryReader.Child.updateValue() + 1108 (GeometryReader.swift:84)
38 SwiftUI 0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
39 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
40 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
41 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
42 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
43 SwiftUI 0x00000001a4347c40 DynamicViewContainer.view.getter + 48
44 SwiftUI 0x00000001a4347ef0 DynamicViewList.updateValue() + 424 (DynamicView.swift:147)
45 SwiftUI 0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
46 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
47 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
48 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
49 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
50 SwiftUI 0x00000001a41dd204 specialized implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 168 (<compiler-generated>:0)
51 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
52 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
53 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
54 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
55 SwiftUI 0x00000001a38b2598 DynamicLayoutViewAdaptor.updatedItems() + 68 (DynamicLayoutView.swift:166)
56 SwiftUI 0x00000001a35e9efc specialized DynamicContainerInfo.updateItems(disableTransitions:) + 68 (DynamicContainer.swift:468)
57 SwiftUI 0x00000001a35e8e98 specialized DynamicContainerInfo.updateValue() + 376 (DynamicContainer.swift:326)
58 SwiftUI 0x00000001a37b304c specialized implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 24 (<compiler-generated>:0)
59 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
60 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
61 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
62 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
63 SwiftUI 0x00000001a3cbcd34 DynamicPreferenceCombiner.info.getter + 96 (DynamicContainer.swift:0)
64 SwiftUI 0x00000001a3cbcf4c DynamicPreferenceCombiner.value.getter + 228 (DynamicContainer.swift:877)
65 SwiftUI 0x00000001a347b0ac implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 324 (<compiler-generated>:0)
66 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
67 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
68 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
69 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
70 SwiftUI 0x00000001a395ed70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
71 SwiftUI 0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
72 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
73 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
74 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
75 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
76 SwiftUI 0x00000001a395ed70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
77 SwiftUI 0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
78 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
79 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
80 AttributeGraph 0x00000001c7eea810 AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, unsigned int, AGSwiftMetadata const*, unsigned char&, long) + 720 (ag-graph.cc:1429)
81 AttributeGraph 0x00000001c7eea3a4 AGGraphGetValue + 228 (AGGraph.mm:701)
82 SwiftUI 0x00000001a395ed70 HostPreferencesTransform.updateValue() + 104 (PreferenceTransformModifier.swift:123)
83 SwiftUI 0x00000001a3390bf8 partial apply for implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 32 (<compiler-generated>:0)
84 AttributeGraph 0x00000001c7ef4240 AG::Graph::UpdateStack::update() + 512 (ag-graph-update.cc:578)
85 AttributeGraph 0x00000001c7eeaf38 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, unsigned int) + 424 (ag-graph-update.cc:719)
86 AttributeGraph 0x00000001c7ef2538 AG::Graph::value_ref(AG::AttributeID, unsigned int, AGSwiftMetadata const*, unsigned char&) + 288 (ag-graph.cc:1201)
87 AttributeGraph 0x00000001c7ef5470 AGGraphGetWeakValue + 388 (AGGraph.mm:735)
88 SwiftUI 0x00000001a48b0424 GraphHost.updatePreferences() + 48 (GraphHost.swift:773)
89 SwiftUI 0x00000001a3ed2940 ViewGraph.updateOutputs() + 300 (ViewGraph.swift:614)
90 SwiftUI 0x00000001a4983674 closure #2 in closure #1 in ViewRendererHost.render(interval:updateDisplayList:) + 1268 (ViewRendererHost.swift:243)
91 SwiftUI 0x00000001a4983028 closure #1 in ViewRendererHost.render(interval:updateDisplayList:) + 660 (ViewRendererHost.swift:235)
92 SwiftUI 0x00000001a4981170 ViewRendererHost.render(interval:updateDisplayList:) + 408 (<compiler-generated>:0)
93 SwiftUI 0x00000001a39192d4 closure #1 in _UIHostingView.requestImmediateUpdate() + 72 (_UIHostingView.swift:701)
94 SwiftUI 0x00000001a49ee690 thunk for @escaping @callee_guaranteed () -> () + 36
95 libdispatch.dylib 0x00000001a731113c _dispatch_call_block_and_release + 32 (init.c:1530)
96 libdispatch.dylib 0x00000001a7312dd4 _dispatch_client_callout + 20 (object.m:576)
97 libdispatch.dylib 0x00000001a73215a4 _dispatch_main_queue_drain + 988 (queue.c:7898)
98 libdispatch.dylib 0x00000001a73211b8 _dispatch_main_queue_callback_4CF + 44 (queue.c:8058)
99 CoreFoundation 0x000000019f44d51c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16 (CFRunLoop.c:1780)
100 CoreFoundation 0x000000019f44a218 __CFRunLoopRun + 1996 (CFRunLoop.c:3149)
101 CoreFoundation 0x000000019f449968 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420)
102 GraphicsServices 0x00000001e37474e0 GSEventRunModal + 164 (GSEvent.c:2196)
103 UIKitCore 0x00000001a18bcedc -[UIApplication _run] + 888 (UIApplication.m:3692)
104 UIKitCore 0x00000001a18bc518 UIApplicationMain + 340 (UIApplication.m:5282)
105 SwiftUI 0x00000001a4283860 closure #1 in KitRendererCommon(_:) + 168 (UIKitApp.swift:51)
106 SwiftUI 0x00000001a42836a8 runApp<A>(_:) + 152 (UIKitApp.swift:14)
107 SwiftUI 0x00000001a3e9f9fc static App.main() + 132 (App.swift:114)
108 Unwatched 0x000000010285aa64 static UnwatchedApp.$main() + 52 (UnwatchedApp.swift:0)
109 Unwatched 0x000000010285aa64 main + 64
110 dyld 0x00000001c296ad84 start + 2240 (dyldMain.cpp:1298)
I've added Sentry to the project, hoping it would give me more details on the crash. This seems to be the same crash, here's the full crashlog.
EXC_BREAKPOINT
_SwiftData_SwiftUI/ModelContainer+Extensions.swift > 'try!' expression unexpectedly raised an error: > 'try!' expression unexpectedly raised an error: SwiftData.SwiftDataError(_error: SwiftData.SwiftDataError._Error.loadIssueModelContainer) > Fatal error >
Stack overflow in (null)
Is anyone seeing a similar crash? Could this be a SwiftData/SwiftUI Bug?
I'm grateful for any ideas on what I could try or where the issue could be coming from.
Thanks to Brian, I think I finally figgured it out!
This Apple Developer Thread has a similar issue, it seems to be a SwiftUI bug. When the App launches in the background from being inactive, it’s crashing when an @Environment variable is used in the root ContentView (only seems to happen for .modelContext for me).
I was able to reliably reproduce it by launching the App in the background directly.
This is what I was doing:
@main
struct MyApp: App {
var sharedModelContainer: ModelContainer = {
// ...
}()
var body: some Scene {
WindowGroup {
ContentView()
}
.modelContainer(sharedModelContainer)
}
}
struct ContentView: View {
@Environment(\.modelContext) var modelContext
var body: some View {
MyView()
}
func someFunc() {
modelContext.insert(...)
}
}
As a workaround, I’m now passing the container to the root view as an argument and adding it there via .modelContainer(...), which seems to avoid the issue:
@main
struct MyApp: App {
var sharedModelContainer: ModelContainer = {
// ...
}()
var body: some Scene {
WindowGroup {
ContentView(container: sharedModelContainer)
}
}
}
struct ContentView: View {
let container: ModelContainer
var body: some View {
MyView()
.modelContainer(container)
}
func someFunc() {
let modelContext = ModelContext(container)
modelContext.insert(...)
}
}