The subclass of NSIncrementalStore causes infinite recursion after iOS upgrade

Originator:ysirko
Number:rdar://123453467 Date Originated:15 August, 2019
Status:New Resolved:
Product:Core Data Product Version:iOS 13 beta 6
Classification:Bug Reproducible:YES
 
When calling metadataForPersistentStoreOfType:URL:error: to get metadata for custom NSIncrementalStore, the method causes an infinite loop.

Inside subclass of NSIncrementalStore I have code like this:

- (BOOL)loadMetadata:(NSError *__autoreleasing *)error {
    NSURL *storeURL = [self URL];

    NSDictionary *metadata = @{NSStoreUUIDKey: <UUID>,
                               NSStoreTypeKey: @"MyIncrementalStore"};
    [self setMetadata:metadata];

    return YES;
}

It seems that setMetadata: method calls loadMetadata: and it creates an infinite recursion(see screenshots).

https://www.dropbox.com/s/hj2nl3oenm5ycly/app%20crash.png?dl=0 https://www.dropbox.com/s/ze56t153jlvx1lc/Screen%20Shot%202019-08-22%20at%2010.44.40%20AM.png?dl=0

I've noticed it only after upgrade from iOS 13 beta 4 to iOS beta 6. The bug isn't reproducible on older iOS versions and on freshly installed apps.

Apple’s documentation also suggests the same approach at https://developer.apple.com/library/archive/documentation/DataManagement/Conceptual/IncrementalStorePG/ImplementationStrategy/ImplementationStrategy.html#//apple_ref/doc/uid/TP40010706-CH2-SW2

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