Our app is crashing in iOS 7, its working fine in iOS 6. We are not sure what is causing the issue. We can see that there is some exception thrown but we are not sure where in code is causing that.
Here is the crash report:
Incident Identifier: 1F589930-15BD-49F7-80E6-831A95092FDF
CrashReporter Key: aaa79870161ff1e371394b881a26e97f0066f464
Hardware Model: iPhone5,2
Process: myapp [1492]
Path: /var/mobile/Applications/A121DF2F-A7B9-4DD9-9FBC-BB06CD7C5EF5/myapp.app/myapp
Identifier: co.uk.myapp
Version: 1.0 (0.9)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2013-10-01 14:59:17.555 +0530
OS Version: iOS 7.0 (11A465)
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread: 2
Last Exception Backtrace:
0 CoreFoundation 0x2d4e4e86 __exceptionPreprocess + 126
1 libobjc.A.dylib 0x377de6c2 objc_exception_throw + 34
2 CoreFoundation 0x2d41e0c6 -[__NSPlaceholderArray initWithObjects:count:] + 414
3 CoreFoundation 0x2d427a4c +[NSArray arrayWithObjects:count:] + 40
4 CoreFoundation 0x2d45d9c0 -[NSDictionary allKeys] + 172
5 Foundation 0x2df73336 -[NSISObjectiveLinearExpression description] + 122
6 Foundation 0x2ddfc808 _NSDescriptionWithLocaleFunc + 84
7 CoreFoundation 0x2d4babf2 __CFStringAppendFormatCore + 5618
8 CoreFoundation 0x2d429d18 _CFStringCreateWithFormatAndArgumentsAux + 72
9 CoreFoundation 0x2d4523c2 _CFLogvEx + 82
10 Foundation 0x2de0b7ee NSLogv + 82
11 Foundation 0x2de0b78e NSLog + 22
12 Foundation 0x2de4a918 -[NSISEngine minimizeConstantInObjectiveRowWithHead:] + 180
13 Foundation 0x2de4a46e -[NSISEngine optimize] + 170
14 Foundation 0x2de461a8 -[NSISEngine withBehaviors:performModifications:] + 312
15 UIKit 0x2fc69490 -[UIView(Hierarchy) _postMovedFromSuperview:] + 292
16 UIKit 0x2feffb92 __UIViewWasRemovedFromSuperview + 214
17 UIKit 0x2fc68342 -[UIView(Hierarchy) removeFromSuperview] + 266
18 UIKit 0x2fd3cccc -[UIScrollView removeFromSuperview] + 60
19 UIKit 0x2fd313e4 -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:] + 312
20 UIKit 0x2fdfcb5c __49-[UINavigationController _startCustomTransition:]_block_invoke + 156
21 UIKit 0x2fd81416 -[_UIViewControllerTransitionContext completeTransition:] + 70
22 UIKit 0x2fe418dc __53-[_UINavigationParallaxTransition animateTransition:]_block_invoke105 + 448
23 UIKit 0x2fca2618 -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 280
24 UIKit 0x2fca226a -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 174
25 UIKit 0x2fca2186 -[UIViewAnimationState animationDidStop:finished:] + 62
26 QuartzCore 0x2f8f8a0e CA::Layer::run_animation_callbacks(void*) + 230
27 libdispatch.dylib 0x37cc30ea _dispatch_client_callout + 18
28 libdispatch.dylib 0x37cc59a4 _dispatch_main_queue_callback_4CF + 264
29 CoreFoundation 0x2d4af5b4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 4
30 CoreFoundation 0x2d4ade80 __CFRunLoopRun + 1304
31 CoreFoundation 0x2d41853c CFRunLoopRunSpecific + 520
32 CoreFoundation 0x2d41831e CFRunLoopRunInMode + 102
33 GraphicsServices 0x3214f2e6 GSEventRunModal + 134
34 UIKit 0x2fccf1e0 UIApplicationMain + 1132
35 myapp 0x00020a16 main (main.mm:16)
36 libdyld.dylib 0x37cd7ab2 tlv_initializer + 2
Thread 0:
0 libsystem_kernel.dylib 0x37d8e588 __semwait_signal_nocancel + 24
1 libsystem_c.dylib 0x37d09788 nanosleep$NOCANCEL + 160
2 libsystem_c.dylib 0x37d24f10 usleep$NOCANCEL + 48
3 libsystem_c.dylib 0x37d3f030 abort + 80
4 myapp 0x001efaea uncaught_exception_handler + 22
5 CoreFoundation 0x2d4e518a __handleUncaughtException + 578
6 libobjc.A.dylib 0x377de924 _objc_terminate() + 172
7 libc++abi.dylib 0x371a51b0 std::__terminate(void (*)()) + 76
8 libc++abi.dylib 0x371a4a04 __cxa_throw + 112
9 libobjc.A.dylib 0x377de796 objc_exception_throw + 246
10 CoreFoundation 0x2d41e0c6 -[__NSPlaceholderArray initWithObjects:count:] + 414
11 CoreFoundation 0x2d427a4c +[NSArray arrayWithObjects:count:] + 40
12 CoreFoundation 0x2d45d9c0 -[NSDictionary allKeys] + 172
13 Foundation 0x2df73336 -[NSISObjectiveLinearExpression description] + 122
14 Foundation 0x2ddfc808 _NSDescriptionWithLocaleFunc + 84
15 CoreFoundation 0x2d4babf4 __CFStringAppendFormatCore + 5620
16 CoreFoundation 0x2d429d18 _CFStringCreateWithFormatAndArgumentsAux + 72
17 CoreFoundation 0x2d4523c2 _CFLogvEx + 82
18 Foundation 0x2de0b7ee NSLogv + 82
19 Foundation 0x2de0b78e NSLog + 22
20 Foundation 0x2de4a918 -[NSISEngine minimizeConstantInObjectiveRowWithHead:] + 180
21 Foundation 0x2de4a46e -[NSISEngine optimize] + 170
22 Foundation 0x2de461a8 -[NSISEngine withBehaviors:performModifications:] + 312
23 UIKit 0x2fc69490 -[UIView(Hierarchy) _postMovedFromSuperview:] + 292
24 UIKit 0x2feffb92 __UIViewWasRemovedFromSuperview + 214
25 UIKit 0x2fc68342 -[UIView(Hierarchy) removeFromSuperview] + 266
26 UIKit 0x2fd3cccc -[UIScrollView removeFromSuperview] + 60
27 UIKit 0x2fd313e4 -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:] + 312
28 UIKit 0x2fdfcb5c __49-[UINavigationController _startCustomTransition:]_block_invoke + 156
29 UIKit 0x2fd81418 -[_UIViewControllerTransitionContext completeTransition:] + 72
30 UIKit 0x2fe418dc __53-[_UINavigationParallaxTransition animateTransition:]_block_invoke105 + 448
31 UIKit 0x2fca261a -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 282
32 UIKit 0x2fca226a -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 174
33 UIKit 0x2fca2186 -[UIViewAnimationState animationDidStop:finished:] + 62
34 QuartzCore 0x2f8f8a0e CA::Layer::run_animation_callbacks(void*) + 230
35 libdispatch.dylib 0x37cc30ec _dispatch_client_callout + 20
36 libdispatch.dylib 0x37cc59a4 _dispatch_main_queue_callback_4CF + 264
37 CoreFoundation 0x2d4af5b4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 4
38 CoreFoundation 0x2d4ade80 __CFRunLoopRun + 1304
39 CoreFoundation 0x2d41853c CFRunLoopRunSpecific + 520
40 CoreFoundation 0x2d41831e CFRunLoopRunInMode + 102
41 GraphicsServices 0x3214f2e6 GSEventRunModal + 134
42 UIKit 0x2fccf1e0 UIApplicationMain + 1132
43 myapp 0x00020a16 main (main.mm:16)
44 libdyld.dylib 0x37cd7ab4 start + 0
Thread 1:
0 libsystem_kernel.dylib 0x37d7b838 kevent64 + 24
1 libdispatch.dylib 0x37cca0d0 _dispatch_mgr_invoke + 228
2 libdispatch.dylib 0x37cc463e _dispatch_mgr_thread + 34
Thread 2 Crashed:
0 libsystem_kernel.dylib 0x37d8ec7c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x37df2e06 _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x37df2cc0 start_wqthread + 4
Thread 3 name: com.apple.NSURLConnectionLoader
Thread 3:
0 libsystem_kernel.dylib 0x37d7ba84 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x37d7b87c mach_msg + 36
2 CoreFoundation 0x2d4af55c __CFRunLoopServiceMachPort + 152
3 CoreFoundation 0x2d4adc7c __CFRunLoopRun + 788
4 CoreFoundation 0x2d41853c CFRunLoopRunSpecific + 520
5 CoreFoundation 0x2d41831e CFRunLoopRunInMode + 102
6 Foundation 0x2de5364c +[NSURLConnection(Loader) _resourceLoadLoop:] + 316
7 Foundation 0x2dec8dc2 __NSThread__main__ + 1058
8 libsystem_pthread.dylib 0x37df4c5a _pthread_body + 138
9 libsystem_pthread.dylib 0x37df4bca _pthread_start + 98
10 libsystem_pthread.dylib 0x37df2ccc thread_start + 4
Thread 4:
0 libsystem_kernel.dylib 0x37d7ba84 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x37d7b87c mach_msg + 36
2 CoreFoundation 0x2d4af55c __CFRunLoopServiceMachPort + 152
3 CoreFoundation 0x2d4adc7c __CFRunLoopRun + 788
4 CoreFoundation 0x2d41853c CFRunLoopRunSpecific + 520
5 CoreFoundation 0x2d41831e CFRunLoopRunInMode + 102
6 Foundation 0x2de06822 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 250
7 Foundation 0x2de57664 -[NSRunLoop(NSRunLoop) run] + 76
8 myapp 0x001c1ffa +[AFURLConnectionOperation networkRequestThreadEntryPoint:] (AFURLConnectionOperation.m:160)
9 Foundation 0x2dec8dc2 __NSThread__main__ + 1058
10 libsystem_pthread.dylib 0x37df4c5a _pthread_body + 138
11 libsystem_pthread.dylib 0x37df4bca _pthread_start + 98
12 libsystem_pthread.dylib 0x37df2ccc thread_start + 4
Thread 5 name: com.apple.CFSocket.private
Thread 5:
0 libsystem_kernel.dylib 0x37d8e440 select$DARWIN_EXTSN + 20
1 CoreFoundation 0x2d4b345e __CFSocketManager + 482
2 libsystem_pthread.dylib 0x37df4c5a _pthread_body + 138
3 libsystem_pthread.dylib 0x37df4bca _pthread_start + 98
4 libsystem_pthread.dylib 0x37df2ccc thread_start + 4
Thread 6:
0 libsystem_kernel.dylib 0x37d8ec7c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x37df2e06 _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x37df2cc0 start_wqthread + 4
Thread 2 crashed with ARM Thread State (32-bit):
r0: 0x00000004 r1: 0x00000000 r2: 0x00000000 r3: 0x00000000
r4: 0x02bcc000 r5: 0x00060001 r6: 0x00004007 r7: 0x02bcbfe0
r8: 0x00000000 r9: 0x00000001 r10: 0x00000000 r11: 0x00000000
ip: 0x00000170 sp: 0x02bcbfc8 lr: 0x37df2e0b pc: 0x37d8ec7c
cpsr: 0x40000010
Kerni
This crash looks like a problem with a constraints you set in your app (in a background thread ?).
In addition this looks similar (not identical) to your other reported crash: https://stackoverflow.com/questions/19114389/app-hang-and-then-crash-ios-7
So in short: your constraints setup (presumably in code) causes this problem. Most likely because your constraints reference a view that is not existing any more.
In Long:
From thread 2 some code is dispatched into the main thread:
28 libdispatch.dylib 0x37cc59a4 _dispatch_main_queue_callback_4CF + 264A transition to another View Controller via a navigation controller did finish:
21 UIKit 0x2fd81416 -[_UIViewControllerTransitionContext completeTransition:] + 70A scrollview is being removed from its superview:
18 UIKit 0x2fd3cccc -[UIScrollView removeFromSuperview] + 60Constraints are being evaluated:
12 Foundation 0x2de4a918 -[NSISEngine minimizeConstantInObjectiveRowWithHead:] + 180The constraints engine wants to log some error into the console:
11 Foundation 0x2de0b78e NSLog + 22The constraints engine tries to generate a string:
5 Foundation 0x2df73336 -[NSISObjectiveLinearExpression description] + 122An exception occurs because it tries to add a
nilobject to anNSArray.
This could happen if your constraint rules (done in code) reference another view that does not exist any more. You should check your constraint rules and set breakpoints to find out which one is causing the crash.
来源：https://stackoverflow.com/questions/19113811/ios-7-app-crash-exc-crash-sigabrt-objc-exception-throw-works-fine-on-ios-6