UICollectionView crash with confusing message after batch updates and reload

Originator:n.morev
Number:rdar://29328986 Date Originated:November 18 2016, 11:49 AM
Status:CLOSED DUPLICATE OF 28496311 CLOSED Resolved:
Product:UIKit Product Version:iOS 10.1
Classification:Crash Reproducible:Always
 
Area:
UIKit

Summary:
If you perform updates on a UICollectionView in one iteration of run loop in the following order:
1. Batch updates.
2. Reload and layout.
3. Batch updates.

Steps to Reproduce:
See the attached project.
Run its unit tests to reproduce the issue.

Expected Results:
The collection view updates its contents correctly without any crashes.

Actual Results:
You get crash with the following error message:
2016-11-18 11:40:09.411 CollectionViewUpdateCrash[56136:10665323] *** Assertion failure in -[UICollectionViewData indexPathForItemAtGlobalIndex:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3600.5.2/UICollectionViewData.m:652
/Users/n.morev/Developer/Playground/CollectionViewUpdateCrash/CollectionViewUpdateCrashTests/CollectionViewUpdateCrashTests.m:87: error: -[CollectionViewUpdateCrashTests testConsecutiveUpdatesFollowedByReloads] : failed: caught "NSInternalInconsistencyException", "request for index path for global index 9223372036854775806 when there are only 1 items in the collection view"
(
	0   CoreFoundation                      0x000000010364334b __exceptionPreprocess + 171
	1   libobjc.A.dylib                     0x00000001011f121e objc_exception_throw + 48
	2   CoreFoundation                      0x0000000103647442 +[NSException raise:format:arguments:] + 98
	3   Foundation                          0x0000000100d87e4d -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
	4   UIKit                               0x0000000102068851 -[UICollectionViewData indexPathForItemAtGlobalIndex:] + 294
	5   UIKit                               0x0000000102069051 -[UICollectionViewData layoutAttributesForGlobalItemIndex:] + 30
	6   UIKit                               0x000000010201f928 -[UICollectionView _viewAnimationsForCurrentUpdate] + 8094
	7   UIKit                               0x00000001020247e1 __71-[UICollectionView _updateWithItems:tentativelyForReordering:animator:]_block_invoke.1983 + 197
	8   UIKit                               0x00000001017796e6 +[UIView(Animation) performWithoutAnimation:] + 90
	9   UIKit                               0x0000000102023337 -[UICollectionView _updateWithItems:tentativelyForReordering:animator:] + 3942
	10  UIKit                               0x000000010201d369 -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:animator:] + 17765
	11  UIKit                               0x0000000102025dba -[UICollectionView _endUpdatesWithInvalidationContext:tentativelyForReordering:animator:] + 71
	12  UIKit                               0x00000001020260fc -[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:animator:] + 432
	13  UIKit                               0x0000000102025f29 -[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:] + 91
	14  UIKit                               0x0000000102025eab -[UICollectionView _performBatchUpdates:completion:invalidationContext:] + 74
	15  UIKit                               0x0000000102025e00 -[UICollectionView performBatchUpdates:completion:] + 53
	16  CollectionViewUpdateCrashTests      0x000000010d484443 -[CollectionViewUpdateCrashTests testConsecutiveUpdatesFollowedByReloads] + 3923
	17  CoreFoundation                      0x00000001035ca05c __invoking___ + 140
	18  CoreFoundation                      0x00000001035c9ee1 -[NSInvocation invoke] + 289
	19  XCTest                              0x000000010d0b1f77 __24-[XCTestCase invokeTest]_block_invoke_2 + 481
	20  XCTest                              0x000000010d0ea7df -[XCTestContext performInScope:] + 190
	21  XCTest                              0x000000010d0b1d83 -[XCTestCase invokeTest] + 255
	22  XCTest                              0x000000010d0b259c -[XCTestCase performTest:] + 457
	23  XCTest                              0x000000010d0af664 -[XCTestSuite performTest:] + 491
	24  XCTest                              0x000000010d0af664 -[XCTestSuite performTest:] + 491
	25  XCTest                              0x000000010d0af664 -[XCTestSuite performTest:] + 491
	26  XCTest                              0x000000010d09b618 __25-[XCTestDriver _runSuite]_block_invoke + 51
	27  XCTest                              0x000000010d0bcd2b -[XCTestObservationCenter _observeTestExecutionForBlock:] + 602
	28  XCTest                              0x000000010d09b4b5 -[XCTestDriver _runSuite] + 436
	29  XCTest                              0x000000010d09c302 -[XCTestDriver _checkForTestManager] + 287
	30  XCTest                              0x000000010d0ebd67 _XCTestMain + 628
	31  CoreFoundation                      0x00000001035e825c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
	32  CoreFoundation                      0x00000001035cd304 __CFRunLoopDoBlocks + 356
	33  CoreFoundation                      0x00000001035cca75 __CFRunLoopRun + 901
	34  CoreFoundation                      0x00000001035cc494 CFRunLoopRunSpecific + 420
	35  GraphicsServices                    0x00000001054e8a6f GSEventRunModal + 161
	36  UIKit                               0x00000001016c0964 UIApplicationMain + 159
	37  CollectionViewUpdateCrash           0x0000000100c21bff main + 111
	38  libdyld.dylib                       0x000000010456668d start + 1
	39  ???                                 0x0000000000000005 0x0 + 5
)

The error message is confusing because nowhere I refer to number 9223372036854775806 (or -1).

Version:
Version 8.1 (8B62)

Notes:


Configuration:
iOS 10.1 Simulator

Comments

Apple Developer Relations December 6 2016, 6:34 PM The original report on this issue, Bug ID 28496311, is closed. If you still see the issue in a newer release, like iOS 11, please file a new bug report.

By n.morev at July 21, 2017, 7:40 p.m. (reply...)

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