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POUnclear crash report in iOS
 

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  1. POUnclear crash report in iOS
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    <p>I found couple of strange crash issues in my app and here is the details of it</p> <pre><code>Incident Identifier: 9ECA0354-F69F-4562-A9FC-4904319BFC72 CrashReporter Key: 7e75d7f19d6ccbb07328f3b3317626187ecbc9bb Hardware Model: iPod5,1 Process: myApp [1760] Path: /var/mobile/Applications/7E5B3CA8-81BA-4F6A-A2A8-1B8F4060A037/myApp.app/myApp Identifier: myApp Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2013-09-24 11:33:16.513 +0530 OS Version: iOS 6.1.3 (10B329) Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Crashed Thread: 11 Last Exception Backtrace: 0 CoreFoundation 0x342c229e __exceptionPreprocess + 158 1 libobjc.A.dylib 0x3bfa697a objc_exception_throw + 26 2 CoreFoundation 0x342c1d80 __NSFastEnumerationMutationHandler + 124 3 Foundation 0x34b62504 -[NSConcreteMapTable countByEnumeratingWithState:objects:count:] + 52 4 CoreFoundation 0x3424ad34 -[__NSFastEnumerationEnumerator nextObject] + 128 5 CoreFoundation 0x3421df0c -[NSEnumerator countByEnumeratingWithState:objects:count:] + 44 6 Foundation 0x34c7208e -[NSISEngine enumerateRows:] + 210 7 Foundation 0x34c77fda -[NSISEngine description] + 118 8 CoreFoundation 0x34232892 -[NSObject(NSObject) _copyDescription] + 30 9 CoreFoundation 0x342a32d6 __CFStringAppendFormatCore + 11134 10 CoreFoundation 0x3423dfa4 CFStringCreateWithFormatAndArguments + 68 11 CoreFoundation 0x342c2190 +[NSException raise:format:] + 52 12 Foundation 0x34c7411a -[NSISEngine minimizeConstantInObjectiveRowWithHead:] + 186 13 Foundation 0x34c76754 -[NSISEngine optimize] + 56 14 Foundation 0x34c76e6a -[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:] + 630 15 Foundation 0x34c7fbba -[NSLayoutConstraint _addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] + 390 16 UIKit 0x365033bc -[UIView(UIConstraintBasedLayout) _layoutEngine_didAddLayoutConstraint:roundingAdjustment:mutuallyExclusiveConstraints:] + 124 17 UIKit 0x36503530 -[UIView(UIConstraintBasedLayout) _tryToAddConstraintWithoutUpdatingConstraintsArray:roundingAdjustment:mutuallyExclusiveConstraints:] + 32 18 UIKit 0x360ea2dc -[UIView(Internal) _didMoveFromWindow:toWindow:] + 372 19 UIKit 0x360ea5c2 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 1114 20 UIKit 0x360e4e4e -[UIView(Hierarchy) _postMovedFromSuperview:] + 134 21 UIKit 0x360cc7d8 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 1296 22 UIKit 0x360e9af2 -[UIScrollView(UIScrollViewInternal) _addContentSubview:atBack:] + 66 23 UIKit 0x360e993a -[UITableView(_UITableViewPrivate) _addContentSubview:atBack:] + 126 24 UIKit 0x360fc0a0 -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow:] + 1696 25 UIKit 0x360fa506 -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1810 26 UIKit 0x361117ca -[UITableView layoutSubviews] + 202 27 UIKit 0x360cd7fe -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 254 28 QuartzCore 0x35e77d86 -[CALayer layoutSublayers] + 210 29 QuartzCore 0x35e77924 CA::Layer::layout_if_needed(CA::Transaction*) + 456 30 QuartzCore 0x35e78858 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 12 31 QuartzCore 0x35e7823e CA::Context::commit_transaction(CA::Transaction*) + 234 32 QuartzCore 0x35e7804c CA::Transaction::commit() + 312 33 QuartzCore 0x35e77eac CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 56 34 CoreFoundation 0x342976c8 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 16 35 CoreFoundation 0x342959bc __CFRunLoopDoObservers + 272 36 CoreFoundation 0x34295d12 __CFRunLoopRun + 738 37 CoreFoundation 0x34208eb8 CFRunLoopRunSpecific + 352 38 CoreFoundation 0x34208d44 CFRunLoopRunInMode + 100 39 GraphicsServices 0x37dd02e6 GSEventRunModal + 70 40 UIKit 0x3611e2fc UIApplicationMain + 1116 41 myApp 0x000a4aca 0xa2000 + 10954 42 libdyld.dylib 0x3c3ddb1c start + 0 </code></pre> <p>It says that thread 11 is crashed but this looks like main thread crash as I can see from last line. The thread 11 stack trace looks like this</p> <pre><code> Thread 11 Crashed: 0 libsystem_kernel.dylib 0x3c4a4d98 __workq_kernreturn + 8 1 libsystem_c.dylib 0x3c3f2cf6 _pthread_workq_return + 14 2 libsystem_c.dylib 0x3c3f2a12 _pthread_wqthread + 362 3 libsystem_c.dylib 0x3c3f28a0 start_wqthread + 4 </code></pre> <p>Also the crash report points out that app was crashed while doing enumeration but I am not sure how it is related to UIView and UITableView objects as I see from the stack trace. Some more info, I have tableview which shows a list if data, this is fetched from server.</p> <p>Can some help me in fixing this issue?</p> <p>Thanks</p>
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    1. COAnything on the console? Are you modifying the collection while enumerating?
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    2. COLooks like a classic race condition: something is executing on thread 11, which MUST execute on the main thread.
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    3. COwhich part of the code throws the exception?
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