Working in latest version of Xcode 12.
When opening a SwiftUI view containing a Core Data list, a crash occurs and execution stops at the first line of the AppDelegate. There is no backtrace info in the console and from what I can see in the backtrace (attached crash.txt), and by stepping through each frame in Xcode, I don't see any code in my app.
Is this a bug? Advice on how to fix? In Xcode 13.0 (only), I cannot view any List. The same code runs as expected in Xcode 12.5
David
(lldb) bt all * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) frame #0: 0x00007fff5b5e19f3 SwiftUI`SwiftUI.SystemListDataSource.contextForItem(index: (Swift.Int, Swift.Int)) -> SwiftUI._RowVisitationContext<SwiftUI.SystemListDataSource<τ_0_0>> + 304 frame #1: 0x00007fff5b5e1a5d SwiftUI`protocol witness for SwiftUI.ListCoreDataSource.contextForItem(index: (τ_0_0.SectionIDs.Index, τ_0_0.RowIDs.Index)) -> SwiftUI._RowVisitationContext<τ_0_0> in conformance SwiftUI.SystemListDataSource<τ_0_0> : SwiftUI.ListCoreDataSource in SwiftUI + 15 frame #2: 0x00007fff5b783db6 SwiftUI`SwiftUI.ShadowListDataSource.contextForItem(index: (τ_0_0.SectionIDs.Index, τ_0_0.RowIDs.Index)) -> SwiftUI._RowVisitationContext<SwiftUI.ShadowListDataSource<τ_0_0>> + 752 frame #3: 0x00007fff5b783f0e SwiftUI`protocol witness for SwiftUI.ListCoreDataSource.contextForItem(index: (τ_0_0.SectionIDs.Index, τ_0_0.RowIDs.Index)) -> SwiftUI._RowVisitationContext<τ_0_0> in conformance SwiftUI.ShadowListDataSource<τ_0_0> : SwiftUI.ListCoreDataSource in SwiftUI + 9 frame #4: 0x00007fff5b91910b SwiftUI`SwiftUI.ListCoreDataSource.visitRowAt<τ_0_0>(_: (τ_0_0.SectionIDs.Index, τ_0_0.RowIDs.Index), visitor: (SwiftUI._RowVisitationContext<τ_0_0>) -> τ_1_0) -> τ_1_0 + 506 frame #5: 0x00007fff5b917e73 SwiftUI`SwiftUI.ListCoreDataSource.visitContent<τ_0_0>(atRow: Foundation.IndexPath, visitor: (SwiftUI._RowVisitationContext<τ_0_0>) -> τ_1_0) -> τ_1_0 + 344 frame #6: 0x00007fff5bb0b0b8 SwiftUI`SwiftUI.UITableViewListCoordinator.updateListContents(__C.UITableView) -> () + 1306 frame #7: 0x00007fff5bb0c0f3 SwiftUI`closure #3 () -> () in performUpdates<τ_0_0, τ_0_1 where τ_0_0: SwiftUI.ListCoreDataSource, τ_0_1: SwiftUI.SelectionManager, τ_0_0.Cell: __C.UITableViewCell, τ_0_0.HeaderFooter: __C.UITableViewHeaderFooterView, τ_0_0.SelectionValue == τ_0_1.SelectionValue>() -> () + 33 frame #8: 0x00007fff5b382ac0 SwiftUI`reabstraction thunk helper from @callee_guaranteed () -> () to @escaping @callee_guaranteed () -> () + 12 frame #9: 0x00007fff5b382ad6 SwiftUI`reabstraction thunk helper from @escaping @callee_guaranteed () -> () to @callee_unowned @convention(block) () -> () + 14 frame #10: 0x00007fff254d2d77 UIKitCore`+[UIView(Animation) performWithoutAnimation:] + 84 frame #11: 0x00007fff5bb09fc3 SwiftUI`performUpdates<τ_0_0, τ_0_1 where τ_0_0: SwiftUI.ListCoreDataSource, τ_0_1: SwiftUI.SelectionManager, τ_0_0.Cell: __C.UITableViewCell, τ_0_0.HeaderFooter: __C.UITableViewHeaderFooterView, τ_0_0.SelectionValue == τ_0_1.SelectionValue>() -> () + 1421 frame #12: 0x00007fff5bb12261 SwiftUI`partial apply forwarder for performUpdates<τ_0_0, τ_0_1 where τ_0_0: SwiftUI.ListCoreDataSource, τ_0_1: SwiftUI.SelectionManager, τ_0_0.Cell: __C.UITableViewCell, τ_0_0.HeaderFooter: __C.UITableViewHeaderFooterView, τ_0_0.SelectionValue == τ_0_1.SelectionValue>() -> () + 93 frame #13: 0x00007fff5b382ac0 SwiftUI`reabstraction thunk helper from @callee_guaranteed () -> () to @escaping @callee_guaranteed () -> () + 12 frame #14: 0x00007fff5b382ad6 SwiftUI`reabstraction thunk helper from @escaping @callee_guaranteed () -> () to @callee_unowned @convention(block) () -> () + 14 frame #15: 0x00007fff254d2d77 UIKitCore`+[UIView(Animation) performWithoutAnimation:] + 84 frame #16: 0x00007fff5bb0c2e9 SwiftUI`closure #1 () -> () in SwiftUI.UITableViewListCoordinator.updateUITableView(_: __C.UITableView, to: τ_0_0, transaction: SwiftUI.Transaction) -> () + 497 frame #17: 0x00007fff5bb12173 SwiftUI`partial apply forwarder for closure #1 () -> () in SwiftUI.UITableViewListCoordinator.updateUITableView(_: __C.UITableView, to: τ_0_0, transaction: SwiftUI.Transaction) -> () + 99 frame #18: 0x00007fff5b418dc9 SwiftUI`reabstraction thunk helper from @escaping @callee_guaranteed () -> () to @escaping @callee_guaranteed () -> (@out ()) + 12 frame #19: 0x00007fff5bb11ffb SwiftUI`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed () -> () to @escaping @callee_guaranteed () -> (@out ()) + 17 frame #20: 0x00007fff5bb12704 SwiftUI`reabstraction thunk helper from @escaping @callee_guaranteed () -> () to @escaping @callee_guaranteed () -> (@out ())partial apply forwarder with unmangled suffix ".56" + 9 frame #21: 0x00007fff5b91438f SwiftUI`closure #1 () -> () in SwiftUI.ViewRendererHost.render(interval: Swift.Double, updateDisplayList: Swift.Bool) -> () + 2368 frame #22: 0x00007fff5b90d5af SwiftUI`SwiftUI.ViewRendererHost.render(interval: Swift.Double, updateDisplayList: Swift.Bool) -> () + 345 frame #23: 0x00007fff5bb39493 SwiftUI`SwiftUI._UIHostingView.layoutSubviews() -> () + 296 frame #24: 0x00007fff5bb394d9 SwiftUI`@objc SwiftUI._UIHostingView.layoutSubviews() -> () + 21 frame #25: 0x00007fff254dfe17 UIKitCore`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 3120 frame #26: 0x00007fff2882b67e QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 548 frame #27: 0x00007fff2883688f QuartzCore`CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 65 frame #28: 0x00007fff287727d4 QuartzCore`CA::Context::commit_transaction(CA::Transaction*, double, double*) + 610 frame #29: 0x00007fff287aa007 QuartzCore`CA::Transaction::commit() + 699 frame #30: 0x00007fff24f2e150 UIKitCore`_UIApplicationFlushRunLoopCATransactionIfTooLate + 70 frame #31: 0x00007fff24fe45ba UIKitCore`__processEventQueue + 15054 frame #32: 0x00007fff24fdbda6 UIKitCore`__eventFetcherSourceCallback + 240 frame #33: 0x00007fff20363bdc CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 frame #34: 0x00007fff20363ad4 CoreFoundation`__CFRunLoopDoSource0 + 180 frame #35: 0x00007fff20362faf CoreFoundation`__CFRunLoopDoSources0 + 242 frame #36: 0x00007fff2035d6f7 CoreFoundation`__CFRunLoopRun + 875 frame #37: 0x00007fff2035cea9 CoreFoundation`CFRunLoopRunSpecific + 567 frame #38: 0x00007fff2c951cd3 GraphicsServices`GSEventRunModal + 139 frame #39: 0x00007fff24f2f72a UIKitCore`-[UIApplication _run] + 915 frame #40: 0x00007fff24f34192 UIKitCore`UIApplicationMain + 101 * frame #41: 0x000000010edd971f Shorty`main at AppDelegate.swift:13:7 frame #42: 0x000000010f81fe1e dyld_sim`start_sim + 10 thread #2 frame #0: 0x00007fff6a59195e libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff6a5cd4c1 libsystem_pthread.dylib`_pthread_wqthread + 414 frame #2: 0x00007fff6a5cc42f libsystem_pthread.dylib`start_wqthread + 15 thread #3 frame #0: 0x00007fff6a59195e libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff6a5cd4c1 libsystem_pthread.dylib`_pthread_wqthread + 414 frame #2: 0x00007fff6a5cc42f libsystem_pthread.dylib`start_wqthread + 15 thread #4 frame #0: 0x00007fff6a59195e libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff6a5cd4c1 libsystem_pthread.dylib`_pthread_wqthread + 414 frame #2: 0x00007fff6a5cc42f libsystem_pthread.dylib`start_wqthread + 15 thread #5 frame #0: 0x00007fff6a59195e libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff6a5cd4c1 libsystem_pthread.dylib`_pthread_wqthread + 414 frame #2: 0x00007fff6a5cc42f libsystem_pthread.dylib`start_wqthread + 15 thread #6, name = 'com.apple.uikit.eventfetch-thread' frame #0: 0x00007fff6a5902ba libsystem_kernel.dylib`mach_msg_trap + 10 frame #1: 0x00007fff6a59062c libsystem_kernel.dylib`mach_msg + 60 frame #2: 0x00007fff2036320d CoreFoundation`__CFRunLoopServiceMachPort + 319 frame #3: 0x00007fff2035d899 CoreFoundation`__CFRunLoopRun + 1293 frame #4: 0x00007fff2035cea9 CoreFoundation`CFRunLoopRunSpecific + 567 frame #5: 0x00007fff2080ca5d Foundation`-[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 209 frame #6: 0x00007fff2080ccd5 Foundation`-[NSRunLoop(NSRunLoop) runUntilDate:] + 72 frame #7: 0x00007fff24fed83a UIKitCore`-[UIEventFetcher threadMain] + 491 frame #8: 0x00007fff2083546b Foundation`__NSThread__start__ + 1066 frame #9: 0x00007fff6a5d08fc libsystem_pthread.dylib`_pthread_start + 224 frame #10: 0x00007fff6a5cc443 libsystem_pthread.dylib`thread_start + 15 thread #7 frame #0: 0x00007fff6a59195e libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff6a5cd4c1 libsystem_pthread.dylib`_pthread_wqthread + 414 frame #2: 0x00007fff6a5cc42f libsystem_pthread.dylib`start_wqthread + 15 thread #8 frame #0: 0x00007fff6a59195e libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff6a5cd4c1 libsystem_pthread.dylib`_pthread_wqthread + 414 frame #2: 0x00007fff6a5cc42f libsystem_pthread.dylib`start_wqthread + 15 thread #9 frame #0: 0x00007fff6a59195e libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff6a5cd4c1 libsystem_pthread.dylib`_pthread_wqthread + 414 frame #2: 0x00007fff6a5cc42f libsystem_pthread.dylib`start_wqthread + 15 thread #10 frame #0: 0x00007fff6a59195e libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff6a5cd4c1 libsystem_pthread.dylib`_pthread_wqthread + 414 frame #2: 0x00007fff6a5cc42f libsystem_pthread.dylib`start_wqthread + 15 (lldb)
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