I recently added SwiftData to my project in a limited capacity. I'm creating ModelConfiguration -> ModelContext directly in Swift code rather than in SwiftUI. I'm using an app group & a CloudKit database/container.
The functionality all seems fine, but I'm dealing with random 0xdead10cc crashes from threads with CoreData/libsqlite3.dylib in the stack traces (particularly with widgets & complications which aren't actively writing anything), often with NSCloudKitMirroringDelegate.m also in the stack. I haven't seen any actual functionality issues, but the crashing is worrisome.
I understand they're keeping files open to cause the 0xdead10cc, but my question is: Is there a clean way to shut down or force shut down SwiftData when using CloudKit? I've looked through example code on Apple's Developer site, but I can't seem to find anything about cleanup/shutdown best practices, though I may be missing something.
Here's an example thread from a crash log:
Thread 12:
0 libsystem_kernel.dylib 0x00000000258b4fe4 pread + 12
1 libsqlite3.dylib 0x0000000023ce7684 seekAndRead + 88 (sqlite3.c:44032)
2 libsqlite3.dylib 0x0000000023c5ffc4 unixRead + 200 (sqlite3.c:44124)
3 libsqlite3.dylib 0x0000000023c730fc readDbPage + 132 (sqlite3.c:66901)
4 libsqlite3.dylib 0x0000000023cf14e4 getPageNormal + 532 (sqlite3.c:69515)
5 libsqlite3.dylib 0x0000000023cfd684 getAndInitPage + 104 (sqlite3.c:79184)
6 libsqlite3.dylib 0x0000000023c8f99c moveToRoot + 532 (sqlite3.c:82309)
7 libsqlite3.dylib 0x0000000023cfa448 sqlite3BtreeTableMoveto + 168 (sqlite3.c:82547)
8 libsqlite3.dylib 0x0000000023c859fc sqlite3VdbeExec + 4996 (sqlite3.c:105391)
9 libsqlite3.dylib 0x0000000023c83da4 sqlite3_step + 976 (sqlite3.c:97868)
10 CoreData 0x00000000211c92d4 _execute + 128 (NSSQLiteConnection.m:4573)
11 CoreData 0x00000000211c5e74 -[NSSQLiteConnection execute] + 1784 (NSSQLiteConnection.m:5014)
12 CoreData 0x000000002121c3f8 -[NSSQLiteConnection insertRow:] + 1488 (NSSQLiteConnection.m:3608)
13 CoreData 0x00000000211ca160 _executeSaveChangesRequest + 1792 (NSSQLCore_Functions.m:2543)
14 CoreData 0x00000000211dc128 -[NSSQLSaveChangesRequestContext executeRequestCore:] + 28 (NSSQLSaveChangesRequestContext.m:263)
15 CoreData 0x00000000211fa424 -[NSSQLStoreRequestContext executeRequestUsingConnection:] + 220 (NSSQLStoreRequestContext.m:183)
16 CoreData 0x00000000211cce3c __52-[NSSQLDefaultConnectionManager handleStoreRequest:]_block_invoke + 56 (NSSQLConnectionManager.m:302)
17 CoreData 0x00000000211c99d4 __37-[NSSQLiteConnection performAndWait:]_block_invoke + 40 (NSSQLiteConnection.m:733)
18 libdispatch.dylib 0x0000000020af2b94 _dispatch_client_callout + 16 (object.m:576)
19 libdispatch.dylib 0x0000000020b004d8 _dispatch_lane_barrier_sync_invoke_and_complete + 56 (queue.c:1104)
20 CoreData 0x00000000211c3d4c -[NSSQLiteConnection performAndWait:] + 140 (NSSQLiteConnection.m:730)
21 CoreData 0x000000002122fb3c -[NSSQLDefaultConnectionManager handleStoreRequest:] + 208 (NSSQLConnectionManager.m:297)
22 CoreData 0x00000000211bd16c -[NSSQLCoreDispatchManager routeStoreRequest:] + 216 (NSSQLCoreDispatchManager.m:60)
23 CoreData 0x00000000211bfb8c -[NSSQLCore dispatchRequest:withRetries:] + 168 (NSSQLCore.m:3999)
24 CoreData 0x00000000211c0480 -[NSSQLCore executeRequest:withContext:error:] + 2044 (NSSQLCore.m:2963)
25 CoreData 0x000000002134662c __65-[NSPersistentStoreCoordinator executeRequest:withContext:error:]_block_invoke.387 + 8968 (NSPersistentStoreCoordinator.m:2967)
26 CoreData 0x00000000211c6190 -[NSPersistentStoreCoordinator _routeHeavyweightBlock:] + 220 (NSPersistentStoreCoordinator.m:644)
27 CoreData 0x00000000211bf3fc -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 1112 (NSPersistentStoreCoordinator.m:2779)
28 CoreData 0x00000000211d5468 -[NSManagedObjectContext save:] + 988 (NSManagedObjectContext.m:1624)
29 CoreData 0x0000000021296ba8 __52+[NSCKEvent beginEventForRequest:withMonitor:error:]_block_invoke_2 + 280 (NSCKEvent.m:76)
30 CoreData 0x00000000211d1024 developerSubmittedBlockToNSManagedObjectContextPerform + 156 (NSManagedObjectContext.m:3987)
31 libdispatch.dylib 0x0000000020af2b94 _dispatch_client_callout + 16 (object.m:576)
32 libdispatch.dylib 0x0000000020b004d8 _dispatch_lane_barrier_sync_invoke_and_complete + 56 (queue.c:1104)
33 CoreData 0x00000000211e3d8c -[NSManagedObjectContext performBlockAndWait:] + 256 (NSManagedObjectContext.m:4104)
34 CoreData 0x000000002129e14c __52+[NSCKEvent beginEventForRequest:withMonitor:error:]_block_invoke + 152 (NSCKEvent.m:66)
35 CoreData 0x00000000212231d0 -[PFCloudKitStoreMonitor performBlock:] + 84 (PFCloudKitStoreMonitor.m:148)
36 CoreData 0x0000000021284c28 +[NSCKEvent beginEventForRequest:withMonitor:error:] + 184 (NSCKEvent.m:61)
37 CoreData 0x000000002125fb80 __57-[NSCloudKitMirroringDelegate _performExportWithRequest:]_block_invoke + 256 (NSCloudKitMirroringDelegate.m:1435)
38 CoreData 0x0000000021209cb4 __92-[NSCloudKitMirroringDelegate _openTransactionWithLabel:assertionLabel:andExecuteWorkBlock:]_block_invoke + 64 (NSCloudKitMirroringDelegate.m:959)
39 libdispatch.dylib 0x0000000020af1288 _dispatch_call_block_and_release + 24 (init.c:1549)
40 libdispatch.dylib 0x0000000020af2b94 _dispatch_client_callout + 16 (object.m:576)
41 libdispatch.dylib 0x0000000020af96bc _dispatch_lane_serial_drain + 680 (queue.c:3934)
42 libdispatch.dylib 0x0000000020afa124 _dispatch_lane_invoke + 376 (queue.c:4025)
43 libdispatch.dylib 0x0000000020b03c40 _dispatch_root_queue_drain_deferred_wlh + 268 (queue.c:7193)
44 libdispatch.dylib 0x0000000020b034fc _dispatch_workloop_worker_thread + 516 (queue.c:6787)
45 libsystem_pthread.dylib 0x0000000025f9b7bc _pthread_wqthread + 280 (pthread.c:2696)
46 libsystem_pthread.dylib 0x0000000025f9b85c start_wqthread + 8 (:-1)
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