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https://issues.apache.org/jira/browse/CB-2851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13625437#comment-13625437
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Pepe Cano commented on CB-2851:
-------------------------------
It is likely an apple bug, due to a Z-index rendered div.
I have modified the HTML content and the error seems to be disappeared.
> iOS UIKit Crash webView:didCreateOrUpdateScrollingLayer:withContentsLayer
> -------------------------------------------------------------------------
>
> Key: CB-2851
> URL: https://issues.apache.org/jira/browse/CB-2851
> Project: Apache Cordova
> Issue Type: Bug
> Components: iOS
> Environment: Xcode 4.6 & 4.6.1 with cordova-ios 2.5 and master
> Reporter: Pepe Cano
> Priority: Minor
> Fix For: Master
>
>
> There are different crashes which appears sometimes on my application startup.
> - [__NSCFDictionary removeFromSuperlayer]
> - EXC_BAD_ACCESS
> The usual two root causes in my opinion are a memory management error (e.g.
> something has died and you've kept an invalid pointer to it because reference
> counting failed) or a not properly initialised thing of some kind that's
> being referenced before it's ready or erroneously, maybe due to a programming
> error.
> Looking at the main thread there I think it's probably something running in
> something like dispatch_async(dispatch_get_main_thread(),^{ ... and the thing
> being run is accessing a pointer that's not valid or (in some cases) points
> to an old, dead thing.
> -------------> EXC_BAD_ACCESS
> com.apple.main-thread Crashed
> 0 libobjc.A.dylib objc_msgSend + 15
> 1 QuartzCore CALayerGetSuperlayer + 88
> 2 UIKit -[UIView(Hierarchy) superview] + 48
> 3 UIKit __UIViewWillBeRemovedFromSuperview + 94
> 4 UIKit -[UIView(Hierarchy) removeFromSuperview] + 56
> 5 UIKit -[UIScrollView setShowsVerticalScrollIndicator:] + 74
> 6 UIKit -[UIWebDocumentView
> webView:didCreateOrUpdateScrollingLayer:withContentsLayer:scrollSize:forNode:allowHorizontalScrollbar:allowVerticalScrollbar:]
> + 342
> 7 CoreFoundation __invoking___ + 68
> 8 CoreFoundation -[NSInvocation invoke] + 290
> 9 CoreFoundation -[NSInvocation invokeWithTarget:] + 50
> 10 WebKit -[_WebSafeForwarder forwardInvocation:] + 374
> 11 ... libdispatch.dylib _dispatch_call_block_and_release + 10
> 12 libdispatch.dylib _dispatch_client_callout + 22
> 13 libdispatch.dylib _dispatch_main_queue_callback_4CF + 228
> 14 CoreFoundation __CFRunLoopRun + 1288
> 15 CoreFoundation CFRunLoopRunSpecific + 356
> 16 CoreFoundation CFRunLoopRunInMode + 104
> 17 GraphicsServices GSEventRunModal + 74
> -------------------------------
> 0 libobjc.A.dylib objc_msgSend + 15
> 1 UIKit -[UIScrollView(Static)
> _adjustScrollerIndicators:alwaysShowingThem:] + 1938
> 2 UIKit -[UIScrollView _endPanWithEvent:] + 5526
> 3 UIKit -[UIScrollView _gestureRecognizerFailed:] + 334
> 4 UIKit -[UIGestureRecognizer _updateGestureWithEvent:] + 2344
> 5 UIKit ___UIGestureRecognizerUpdate_block_invoke_0543 + 46
> 6 UIKit _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 218
> 7 UIKit _UIGestureRecognizerUpdate + 1164
> 8 UIKit -[UIWindow _sendGesturesForEvent:] + 766
> 9 UIKit -[UIWindow sendEvent:] + 90
> 10 UIKit -[UIApplication sendEvent:] + 380
> 11 UIKit _UIApplicationHandleEvent + 6198
> 12 GraphicsServices _PurpleEventCallback + 590
> 13 GraphicsServices PurpleEventCallback + 34
> 14 ... CoreFoundation
> __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 34
> 20 UIKit UIApplicationMain + 1120
> 21 Yoin
> ---------------------------------------------------
> I have also reported to Apple but I did not still know which could be the
> root of the problem.
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