ALAssetsLibrary violate Core Data multithreading policy

Originator:singjie
Number:rdar://20705256 Date Originated:27-Apr-2015 03:05 PM
Status:Open Resolved:
Product:iOS Product Version:8.3
Classification: Reproducible:Always
 
Summary:
When I have "-com.apple.CoreData.ConcurrencyDebug 1" enabled, it crashes immediately when I access ALAssetsLibrary using 'enumerateGroupsWithTypes:usingBlock:failureBlock:'.

Crashes with #0	0x000000018272a614 in +[NSManagedObjectContext __Multithreading_Violation_AllThatIsLeftToUsIsHonor__] ()

Steps to Reproduce:
1. Open demo project and ensure "-com.apple.CoreData.ConcurrencyDebug 1" is set in scheme run argument .
2. Build & Run project

Expected Results:
App shouldn't crash

Actual Results:
App crashes on both 8.3 simulators and devices. Works fine on 8.2. It crashes with the following stacktrace:

#0	0x000000018272a614 in +[NSManagedObjectContext __Multithreading_Violation_AllThatIsLeftToUsIsHonor__] ()
#1	0x00000001826f3e00 in -[_PFBatchFaultingArray dealloc] ()
#2	0x0000000194231724 in (anonymous namespace)::AutoreleasePoolPage::pop(void*) ()
#3	0x00000001828cd074 in _CFAutoreleasePoolPop ()
#4	0x00000001829a18a8 in __CFRunLoopRun ()
#5	0x00000001828cd2d4 in CFRunLoopRunSpecific ()
#6	0x000000018c0e36fc in GSEventRunModal ()
#7	0x0000000187492fac in UIApplicationMain ()
#8	0x00000001000f2e20 in main at /Users/singjie/projects/work/temp/Assets/Assets/main.m:14
#9	0x0000000194896a08 in start ()


Version:
iOS 8.3

Notes:


Configuration:
iPhone 6/6+ / Simulator

Comments

Reproduced

This appears to still be an issue. Any update regarding it's status.

By jfeldman.mobile at July 9, 2015, 1:02 a.m. (reply...)

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