App Version (from "Chrome Settings > About Chrome"): 57.0.2987.100
iOS Version: 10.2
Device: iPad

Report 3bffa52d80000000

0x000000018d6351b8	(CoreFoundation + 0x001301b8 )	__exceptionPreprocess
0x000000018c06c558	(libobjc.A.dylib + 0x00008558 )	objc_exception_throw
0x000000018d635088	(CoreFoundation + 0x00130088 )	+[NSException raise:format:arguments:]
0x000000018e0ed028	(Foundation + 0x000ae028 )	-[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:]
0x00000001936b57ec	(UIKit + 0x001e17ec )	-[UICollectionViewData indexPathForItemAtGlobalIndex:]
0x0000000193ddd7e4	(UIKit + 0x009097e4 )	__51-[UICollectionView _viewAnimationsForCurrentUpdate]_block_invoke_2
0x000000018d516178	(CoreFoundation + 0x00011178 )	__65-[__NSDictionaryM enumerateKeysAndObjectsWithOptions:usingBlock:]_block_invoke
0x000000018d516044	(CoreFoundation + 0x00011044 )	-[__NSDictionaryM enumerateKeysAndObjectsWithOptions:usingBlock:]
0x00000001936b9060	(UIKit + 0x001e5060 )	__51-[UICollectionView _viewAnimationsForCurrentUpdate]_block_invoke
0x00000001936b65d8	(UIKit + 0x001e25d8 )	-[UICollectionView _viewAnimationsForCurrentUpdate]
0x0000000193de01fc	(UIKit + 0x0090c1fc )	__71-[UICollectionView _updateWithItems:tentativelyForReordering:animator:]_block_invoke.1993
0x00000001934f17d8	(UIKit + 0x0001d7d8 )	+[UIView(Animation) performWithoutAnimation:]
0x0000000193ddf22c	(UIKit + 0x0090b22c )	-[UICollectionView _updateWithItems:tentativelyForReordering:animator:]
0x0000000193ddd2cc	(UIKit + 0x009092cc )	-[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:animator:]
0x0000000193de0c94	(UIKit + 0x0090cc94 )	-[UICollectionView _endUpdatesWithInvalidationContext:tentativelyForReordering:animator:]
0x0000000193de0f74	(UIKit + 0x0090cf74 )	-[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:animator:]
0x0000000193de0dd4	(UIKit + 0x0090cdd4 )	-[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:]
0x0000000193de0d58	(UIKit + 0x0090cd58 )	-[UICollectionView _performBatchUpdates:completion:invalidationContext:]
0x00000001936bd614	(UIKit + 0x001e9614 )	-[UICollectionView performBatchUpdates:completion:]
0x000000010032fea4	(Chrome -reading_list_view_controller.mm:1001 )	-[ReadingListViewController removeEmptySections]
0x000000010032f5b4	(Chrome -reading_list_view_controller.mm:950 )	-[ReadingListViewController moveSelectedItems:toSection:]
0x000000010032e190	(Chrome -reading_list_view_controller.mm:748 )	-[ReadingListViewController markItemsUnread]
0x0000000193518d2c	(UIKit + 0x00044d2c )	-[UIApplication sendAction:to:from:forEvent:]
0x0000000193518cac	(UIKit + 0x00044cac )	-[UIControl sendAction:to:forEvent:]
0x0000000193503124	(UIKit + 0x0002f124 )	-[UIControl _sendActionsForEvents:withEvent:]
0x0000000193518598	(UIKit + 0x00044598 )	-[UIControl touchesEnded:withEvent:]
0x00000001935180c0	(UIKit + 0x000440c0 )	-[UIWindow _sendTouchesForEvent:]


Only 1 report, so not yet RBS, but PTAL.