Unclear crash report in iOS - ios

Question

I found couple of strange crash issues in my app and here is the details of it
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
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
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
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.
Can some help me in fixing this issue?
Thanks

Answer 1

#nkd, why not use a Crash Reporting Manager like , Crashlytics it does a two step symbolication process, once at the app, and at the server side, to give you exact location of your crash with all thread information, testing environment etc.
I have been using this extensively, helps a lot in resolving bugs.