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lionheart / openradar-mirror

A mirror of radars pulled from http://openradar.me/.
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26021018: UICollectionView batch update heap corruption #14606

Open openradar-mirror opened 8 years ago

openradar-mirror commented 8 years ago

Description

Summary: When performing a particular set of batch updates on a UICollectionView with a certain number of sections, it appears there is a heap corruption and crash in objc_release in -[UICollectionViewUpdate _computeItemUpdates].

Steps to Reproduce:

  1. Setup a UICollectionView with 8 sections, each with 3 items
  2. Perform batch updates with: a. Insert item at section 1, item 0 b. Insert section 0 c. Move section 3 to section 1
  3. Make sure data source is properly updated to reflect changes

Expected Results: UICollectionView performs the queued updates on the view hierarchy.

Actual Results: UICollectionView crashes with the following trace:

0 0x0000000101a3bd7b in objc_release ()

1 0x000000010325241c in -[UICollectionViewUpdate _computeItemUpdates]()

2 0x0000000103251315 in -[UICollectionViewUpdate initWithCollectionView:updateItems:oldModel:newModel:oldVisibleBounds:newVisibleBounds:]()

3 0x00000001032c078b in -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:]()

4 0x00000001032c8497 in -[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:]()

5 0x00000001032c82d5 in -[UICollectionView _performBatchUpdates:completion:invalidationContext:]()

6 0x00000001032c8278 in -[UICollectionView performBatchUpdates:completion:]()

Version: Crash reports from production show issue occurring on iOS 7.1.2, 8.3, 8.4, 9.1, 9.2, 9.2.1, 9.3, and 9.3.1. Locally reproduce on iOS 9.3.1 and Xcode 7.3 simulators.

Notes: Changing from 8 to 9 sections in the sample project seems to mitigate the issue. The same happens when using only 7 sections.

Configuration: All iPhones and iOS Simulators

Attachments: 'UICollectionViewHeapCorruption.zip' was successfully uploaded.

Product Version: 9.3.1 Created: 2016-04-30T03:28:18.981470 Originated: 2016-04-29T00:00:00 Open Radar Link: http://www.openradar.me/26021018

openradar-mirror commented 8 years ago

Modified: 2016-04-30T03:28:18.981700