Pepe Cano created CB-2851:
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Summary: iOS UIKit Crash
webView:didCreateOrUpdateScrollingLayer:withContentsLayer
Key: CB-2851
URL: https://issues.apache.org/jira/browse/CB-2851
Project: Apache Cordova
Issue Type: Bug
Affects Versions: 2.5.0
Environment: Xcode 4.6 & 4.6.1 with cordova-ios (2.5)
Reporter: Pepe Cano
Priority: Minor
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.
The errors have disappeared when:
- Removing (FileTransfer/CDVContacts plugin)
- Disabling scrolling in the webView
((UIScrollView*)[self.webView scrollView]).scrollEnabled = NO;
-------------> 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
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I have also reported to Apple but I did not still know which could be the root
of the problem.
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