The call stack is followed: Incident Identifier: 5DBD18B5-29DD-48E1-8BE5-A648BD4E8CE3 CrashReporter Key: 4006fd6d63831c08be5068429b9892f633d41735 Hardware Model: iPhone12,5 Process: *** Path: /private/var/containers/Bundle/Application/FD114B6F-9C45-4546-9924-082A2CF546B8/***.app/*** Identifier: com.***.*** Version: 2.0.0 (2.0.0.3) AppStoreTools: 13A227 AppVariant: 1:iPhone12,5:13 Code Type: ARM-64 (Native) Role: Unspecified Parent Process: launchd [1] Coalition: com.***.*** [2761] Date/Time: 2021-09-28 14:24:03.8329 +0800 Launch Time: 2021-09-28 14:24:03.5890 +0800 OS Version: iPhone OS 15.0 (19A346) Release Type: User Baseband Version: 3.00.00 Report Version: 104 Exception Type: EXC_GUARD Exception Subtype: GUARD_TYPE_USER Exception Message: namespc 18 reason_code 0x0000000000000002 Exception Codes: 0x6000000000000012, 0x0000000000000002 Exception Note: SIMULATED (this is NOT a crash) Termination Reason: LIBSYSTEM; [2] Thread 3: Crashed 0 libsystem_kernel.dylib 0x1b80a2ae8 os_fault_with_payload + 7382641384 ((null)) 1 libsystem_trace.dylib 0x000000019bd941b4 _os_log_impl_flatten_and_send + 6909673908 ((null)) 2 libsystem_trace.dylib 0x000000019bd90b70 _os_log + 6909660016 ((null)) 3 libsystem_trace.dylib 0x000000019bd98cac _os_log_fault_impl + 6909693100 ((null)) 4 SyncedDefaults 0x1ad034c90 -[SYDRemotePreferencesSource initWithApplicationID:storeID:shared:additionalSource:containerPath:storeType:].cold.1 + 52 5 SyncedDefaults 0x1ad027210 -[SYDRemotePreferencesSource initWithApplicationID:storeID:shared:additionalSource:containerPath:storeType:] + 1400 6 Foundation 0x182ff5d58 -[NSUbiquitousKeyValueStore initWithBundleIdentifier:storeIdentifier:additionalStore:storeType:] + 348 7 Foundation 0x182fd8e84 __41+[NSUbiquitousKeyValueStore defaultStore]_block_invoke + 24 8 libdispatch.dylib 0x000000018140194c _dispatch_client_callout + 6463428940 ((null)) 9 libdispatch.dylib 0x00000001814031d4 _dispatch_once_callout + 6463435220 ((null)) 10 Foundation 0x182fe0668 +[NSUbiquitousKeyValueStore defaultStore] + 64 ... // omit insignificant call stack of the app 14 libdispatch.dylib 0x00000001813ffc00 _dispatch_call_block_and_release + 6463421440 ((null)) 15 libdispatch.dylib 0x000000018140194c _dispatch_client_callout + 6463428940 ((null)) 16 libdispatch.dylib 0x0000000181413064 _dispatch_root_queue_drain + 6463500388 ((null)) 17 libdispatch.dylib 0x0000000181413764 _dispatch_worker_thread2 + 6463502180 ((null)) 18 libsystem_pthread.dylib 0x00000001f12c5170 _pthread_wqthread + 8341180784 ((null)) 19 libsystem_pthread.dylib 0x00000001f12c4f4c start_wqthread + 8341180236 ((null)) What's mean the Exception Note: SIMULATED (this is NOT a crash)? It's not a crash? And then, is it possible a bug in iOS 15？because no crash reports before iOS 15. Thanks.

I initialize the mapView following the line: MKMapView *mapView = [[MKMapView alloc] init]; and never crash when debugging, but it has occured some times for my users. Here is the stack frame FATAL_SIGNAL SIGSEGV fault_address:0x0000000000000000 Thread 0 name: com.apple.main-thread 0 VectorKit std::__1::__hash_table<std::__1::__hash_value_type<std::__1::shared_ptr<md::LabelImageKey>,std::__1::__list_iterator<md::LabelImageLoader::CachedItem, void*> >,std::__1::__unordered_map_hasher<std::__1::shared_ptr<md::LabelImageKey>,std::__1::__hash_value_type<std::__1::shared_ptr<md::LabelImageKey>,std::__1::__list_iterator<md::LabelImageLoader::CachedItem, void*> >,md::LabelImageLoader::LabelImageCacheHash, true>, std::__1::__unordered_map_equal<std::__1::shared_ptr<md::LabelImageKey>,std::__1::__hash_value_type<std::__1::shared_ptr<md::LabelImageKey>, std::__1::__list_iterator<md::LabelImageLoader::CachedItem, void*> >, md::LabelImageLoader::LabelImageCacheEq, true>,geo::StdAllocator<std::__1::__hash_value_type<std::__1::shared_ptr<md::LabelImageKey>,std::__1::__list_iterator<md::LabelImageLoader::CachedItem, void*> >,mdm::Allocator> >::__rehash(unsigned long) (in VectorKit) 1 VectorKit md::LabelImageLoader::LabelImageLoader(md::LabelManager&) (in VectorKit) 2 VectorKit md::LabelManager::LabelManager(md::WorldType, VKMapPurpose, VKSharedResources*, std::__1::shared_ptr<md::TaskContext>, ggl::RenderTargetFormat const&, float) (in VectorKit) 3 VectorKit std::__1::__shared_ptr_emplace<md::LabelManager, std::__1::allocator<md::LabelManager>>::__shared_ptr_emplace<md::WorldType, VKMapPurpose&,VKSharedResources*&,std::__1::shared_ptr<md::TaskContext>&, ggl::RenderTargetFormatconst&,float&>(md::WorldType&&, VKMapPurpose&, VKSharedResources*&,std::__1::shared_ptr<md::TaskContext>&, ggl::RenderTargetFormat const&, float&) (in VectorKit) 4 VectorKit md::LabelsLogic::LabelsLogic(float,VKMapPurpose, VKSharedResources*, objc_objectobjcproto14MDRenderTarget*,std::__1::shared_ptr<md::TaskContext>) (in VectorKit) 5 VectorKit md::MapEngine::MapEngine(float, float, float, bool, std::__1::shared_ptr<md::TaskContext> const&,VKMapPurpose,std::__1::unique_ptr<md::AnimationManager, std::__1::default_delete<md::AnimationManager> >,geo::linear_map<md::MapEngineSetting, long long,std::__1::equal_to<md::MapEngineSetting>,std::__1::allocator<std::__1::pair<md::MapEngineSetting, long long> >,std::__1::vector<std::__1::pair<md::MapEngineSetting, long long>,std::__1::allocator<std::__1::pair<md::MapEngineSetting, long long> > > > const&, unsigned long long,GEOApplicationAuditToken*) (in VectorKit) 6 VectorKit md::MapEngine::interactiveMapEngine(float, bool, geo::linear_map<md::MapEngineSetting, long long,std::__1::equal_to<md::MapEngineSetting>,std::__1::allocator<std::__1::pair<md::MapEngineSetting, long long> >,std::__1::vector<std::__1::pair<md::MapEngineSetting, long long>,std::__1::allocator<std::__1::pair<md::MapEngineSetting, long long> > > > const&, unsigned long long,GEOApplicationAuditToken*) (in VectorKit) 7 VectorKit -[VKMapView initShouldRasterize:inBackground:contentScale:auditToken:] (in VectorKit) 8 MapKit -[MKBasicMapView initWithFrame:andGlobe:shouldRasterize:] (in MapKit) 9 MapKit -[MKMapView _commonInitFromIB:gestureRecognizerHostView:locationManager:showsAttribution:showsAppleLogo:] (in MapKit) 10 MapKit -[MKMapView initWithFrame:] (in MapKit) Thanks for answer.