I don't understand why this is crashing, whenever i came back to home page this app crashes, I have a file LocationSelectViewController.m when enabling zombie it throws an error
[LocationSelectViewController respondsToSelector:]: message sent to deallocated instance 0x27b96740
Let me share a crash log
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libobjc.A.dylib 0x3b2665d0 objc_msgSend + 16
1 MapKit 0x343b7492 -[MKReverseGeocoder _notifyResult:] + 70
2 ProtocolBuffer 0x389631b6 -[PBRequester connectionDidFinishLoading:] + 1042
3 Foundation 0x33eac912 __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke_0 + 14
4 Foundation 0x33dec764 -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 196
5 Foundation 0x33dec680 -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 56
6 CFNetwork 0x3324d64c ___delegate_didFinishLoading_block_invoke_0 + 24
7 CFNetwork 0x3324cd30 ___withDelegateAsync_block_invoke_0 + 52
8 CFNetwork 0x33275010 ___performAsync_block_invoke_068 + 16
9 CoreFoundation 0x334b6aca CFArrayApplyFunction + 174
10 CFNetwork 0x3327546e RunloopBlockContext::perform() + 70
11 CFNetwork 0x331d945e MultiplexerSource::perform() + 186
12 CoreFoundation 0x335458f4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 12
13 CoreFoundation 0x33545158 __CFRunLoopDoSources0 + 208
14 CoreFoundation 0x33543f2a __CFRunLoopRun + 642
15 CoreFoundation 0x334b7238 CFRunLoopRunSpecific + 352
16 CoreFoundation 0x334b70c4 CFRunLoopRunInMode + 100
17 GraphicsServices 0x37096336 GSEventRunModal + 70
18 UIKit 0x353d32b4 UIApplicationMain + 1116
19 PlanetTran 0x000af534 0xae000 + 5428
20 PlanetTran 0x000af4cc 0xae000 + 5324
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1 Crashed:
0 libsystem_kernel.dylib 0x3b74f5d0 kevent64 + 24
1 libdispatch.dylib 0x3b68ad22 _dispatch_mgr_invoke + 806
2 libdispatch.dylib 0x3b686374 _dispatch_mgr_thread + 32
Try to convert your application in ARC(Automatic reference counting).
message sent to deallocated instance means you are trying to send the message that object is destroyed Automatically so you are getting this exceptions.
For converting in ARC goto Xcode
Edit->Refactor->convert to objective c ARC
Related
Running an iPhone app using the latest version of AFNetworking, the most popular crash according to Crashlytics is involving NSBlockOperation. I am unsure whether AFNetworking is responsible or not. The log from Crashlytics:
Exception Type: EXC_BAD_ACCESS Code: KERN_INVALID_ADDRESS at 0x2985118298
5com.apple.NSURLConnectionLoader Crashed
0 libobjc.A.dylib objc_msgSend + 9
1 Foundation -[NSBlockOperation main] + 200
2 Foundation -[__NSOperationInternal start] + 840
3 Foundation -[_NSCFURLProtocolBridgeWithTrampoline processEventQ] + 344
4 Foundation -[_NSCFURLProtocolBridgeWithTrampoline pushEvent:from:] + 298
5 Foundation -[_NSCFURLProtocolBridge stop] + 88
6 Foundation _bridger + 64
7 CFNetwork __block_global_7 + 24
8 CFNetwork __block_global_8 + 12
9 CFNetwork ___performAsync_block_invoke_068 + 18
10 CoreFoundation CFArrayApplyFunction + 176
11 CFNetwork RunloopBlockContext::perform() + 74
12 CFNetwork MultiplexerSource::perform() + 188
13 ... CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
14 CoreFoundation __CFRunLoopDoSources0 + 212
15 CoreFoundation __CFRunLoopRun + 646
16 CoreFoundation CFRunLoopRunSpecific + 356
17 CoreFoundation CFRunLoopRunInMode + 104
18 Foundation +[NSURLConnection(Loader) _resourceLoadLoop:] + 308
19 Foundation __NSThread__main__ + 972
20 libsystem_c.dylib _pthread_start + 308
Let me know if you need more logs. Can anybody direct me in the direction to avoid this crash? Out of 2500 users 76 users has been affected.
Update Sept 17:
Seems like this guy is having the same problem:
iOS Blocks Async Callbacks Causing Crash after View Controller is deallocated.
We have released an app to the AppStore and after an update it crashes after trying to login. We have been heavily relying on a CoreData database in it and we think it is the reason of the crash. Nevertheless I couldn't get any valuable info from the device, just a crash log that features some thread information. Here's how it looks:
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0xd0000008
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libobjc.A.dylib 0x32b3e5b0 objc_msgSend + 16
1 Foundation 0x337cbd18 -[NSError dealloc] + 56
2 libobjc.A.dylib 0x32b40484 (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 164
3 CoreFoundation 0x31bc843c _CFAutoreleasePoolPop + 12
4 Foundation 0x337ccf76 -[NSAutoreleasePool drain] + 118
5 CoreData 0x32f6d4ae -[NSManagedObjectContext save:] + 1206
6 ourapp 0x0012fbf8 0xba000 + 482296
7 CoreData 0x32f70bbe developerSubmittedBlockToNSManagedObjectContextPerform + 86
8 CoreData 0x32f70cee -[NSManagedObjectContext performBlockAndWait:] + 90
9 ourapp 0x0012fb4c 0xba000 + 482124
10 ourapp 0x000c4e08 0xba000 + 44552
11 ourapp 0x000cced4 0xba000 + 77524
12 ourapp 0x000db50a 0xba000 + 136458
13 ourapp 0x0014c41a 0xba000 + 599066
14 Foundation 0x33893ef2 __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke_0 + 14
15 Foundation 0x337d39ec -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 196
16 Foundation 0x337d3908 -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 56
17 CFNetwork 0x38da65dc ___delegate_didFinishLoading_block_invoke_0 + 24
18 CFNetwork 0x38da5cc8 ___withDelegateAsync_block_invoke_0 + 52
19 CFNetwork 0x38dce130 ___performAsync_block_invoke_068 + 16
20 CoreFoundation 0x31bcb74a CFArrayApplyFunction + 174
21 CFNetwork 0x38dce58e RunloopBlockContext::perform() + 70
22 CFNetwork 0x38d3215a MultiplexerSource::perform() + 186
23 CoreFoundation 0x31c5a680 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 12
24 CoreFoundation 0x31c59f7a __CFRunLoopDoSources0 + 358
25 CoreFoundation 0x31c58cb2 __CFRunLoopRun + 642
26 CoreFoundation 0x31bcbeb8 CFRunLoopRunSpecific + 352
27 CoreFoundation 0x31bcbd44 CFRunLoopRunInMode + 100
28 GraphicsServices 0x399c92e6 GSEventRunModal + 70
29 UIKit 0x394872f4 UIApplicationMain + 1116
30 ourapp 0x000be76a 0xba000 + 18282
31 ourapp 0x000bb684 0xba000 + 5764
Are there any other chances I can get more info out of this situation? How can I plug it in to XCode and possibly trace the crash or it can only be done post-factum?
And most importantly, what do you think is causing the crash?
Our problem was connected with Core Data lightweight migration. We were using the "Magical Record" library for handling our Core Data fetches and updating it solved the problem.
Also, this blog post was quite useful.
The last call objc_msgSend tells that it may be Zombie Messaged, but it's in the Core Data library code...
Exception Type: EXC_CRASH (SIGSEGV)
Exception Codes: 0x00000000, 0x00000000
Crashed Thread: 1
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libobjc.A.dylib 0x37a6ef78 objc_msgSend + 16
1 CoreData 0x3601a748 -[_CDSnapshot dealloc] + 60
2 CoreData 0x3601a336 -[_CDSnapshot release] + 118
3 CoreData 0x3601a6c4 _NSQLRow_dealloc_standard + 52
4 CoreData 0x3601a67c _PFfastRowRelease + 24
5 CoreFoundation 0x35692936 __CFDictionaryReleaseValue + 26
6 CoreFoundation 0x356e6104 __CFBasicHashRemoveValue + 96
7 CoreFoundation 0x3561a7e4 CFBasicHashRemoveValue + 2900
8 CoreFoundation 0x35619c60 CFDictionaryRemoveValue + 172
9 CoreData 0x3601a62e -[NSPersistentStoreCache decrementRefCountForObjectID:] + 66
10 CoreData 0x3601a5b0 -[NSSQLCore managedObjectContextDidUnregisterObjectsWithIDs:] + 124
11 CoreData 0x3601a4f6 -[NSPersistentStoreCoordinator(_NSInternalMethods) _informAffectedStoresOfInterestByChildContextInObjectsWithObjectIDs:withSelector:] + 414
12 CoreData 0x3601af34 -[_PFManagedObjectReferenceQueue _processReferenceQueue:] + 1800
13 CoreData 0x3606a1f6 -[NSManagedObjectContext _mergeChangesFromDidSaveDictionary:usingObjectIDs:] + 2078
14 CoreData 0x36069092 -[NSManagedObjectContext mergeChangesFromContextDidSaveNotification:] + 182
15 Messenger -[WXManagedObjectContextManager managedObjectContextDidSave:] (in Messenger) (WXManagedObjectContextManager.m:106)
16 CoreFoundation 0x3562c1f4 -[NSObject performSelector:withObject:] + 36
17 Foundation 0x351f0740 __NSThreadPerformPerform + 344
18 CoreFoundation 0x356a1acc __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 8
19 CoreFoundation 0x356a1298 __CFRunLoopDoSources0 + 208
20 CoreFoundation 0x356a003e __CFRunLoopRun + 646
21 CoreFoundation 0x3562349e CFRunLoopRunSpecific + 294
22 CoreFoundation 0x35623366 CFRunLoopRunInMode + 98
23 GraphicsServices 0x372bf432 GSEventRunModal + 130
24 UIKit 0x3312fcce UIApplicationMain + 1074
25 Messenger 0x000034fc 0x1000 + 9468
26 Messenger 0x00003468 0x1000 + 9320
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1 Crashed:
0 libsystem_kernel.dylib 0x35f733a8 kevent + 24
1 libdispatch.dylib 0x3455df04 _dispatch_mgr_invoke + 708
2 libdispatch.dylib 0x3455dc22 _dispatch_mgr_thread + 30
May be its problem from begin so use any option from bellow ways..
set exception breakpoint in your application and for that follow this link ios-5-xcode-backtrace.
OR
2.Try to run the application with NSZombieEnabled from this link how-to-enable-nszombie-in-xcode also
Below are the crash logs from an iPad. I'm getting this crash randomly while I'm pushing and popping out a UIViewController from Navigation controller. Any help/pointer is appreciated.
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00000000
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libobjc.A.dylib 0x31430386 _ZL12realizeClassP7class_t + 34
1 libobjc.A.dylib 0x314303e6 _ZL12realizeClassP7class_t + 130
2 libobjc.A.dylib 0x3142a836 prepareForMethodLookup + 74
3 libobjc.A.dylib 0x3142a740 lookUpMethod + 40
4 libobjc.A.dylib 0x3142a70c _class_lookupMethodAndLoadCache3 + 12
5 libobjc.A.dylib 0x31429fc4 objc_msgSend_uncached + 20
6 UIKit 0x3186553e -[UINavigationItem _accumulateViewsFromItems:isLeft:refreshViews:] + 270
7 UIKit 0x31851244 -[UINavigationItem _updateViewsForBarSizeChangeAndApply:] + 124
8 UIKit 0x319e023a __33-[UINavigationBar layoutSubviews]_block_invoke_0 + 250
9 UIKit 0x31838b46 +[UIView(Animation) _performWithoutAnimation:] + 62
10 UIKit 0x3184d2e2 -[UINavigationBar layoutSubviews] + 382
11 UIKit 0x31814f30 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 176
12 CoreFoundation 0x315431f4 -[NSObject performSelector:withObject:] + 36
13 QuartzCore 0x35459a9e -[CALayer layoutSublayers] + 210
14 QuartzCore 0x354596b6 CA::Layer::layout_if_needed(CA::Transaction*) + 210
15 QuartzCore 0x3545d83c CA::Context::commit_transaction(CA::Transaction*) + 220
16 QuartzCore 0x3545d578 CA::Transaction::commit() + 308
17 QuartzCore 0x354554b2 CA:::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 50
18 CoreFoundation 0x315b8b14 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 12
19 CoreFoundation 0x315b6d50 __CFRunLoopDoObservers + 252
20 CoreFoundation 0x315b70aa __CFRunLoopRun + 754
21 CoreFoundation 0x3153a49e CFRunLoopRunSpecific + 294
22 CoreFoundation 0x3153a366 CFRunLoopRunInMode + 98
23 GraphicsServices 0x32a13432 GSEventRunModal + 130
24 UIKit 0x3183fcce UIApplicationMain + 1074
25 SmartClassTPS 0x000b551a main (main.m:16)
26 SmartClassTPS 0x000b5170 start + 32
Was able to figure out long back but forgot to update here. KVO observer not removed! Silly me :-|. BTW thanks for the support. SO rocks.
Most probably you forgot to clear some delegates before releasing an object.
I have the following crash that I can't replicate on demand but does happen enough to get noticed by the users.
This crash report has been symbolicated as well. How would you find out the cause!!! This only seems to happen on 4.1
Exception Type: SIGSEGV
Exception Codes: SEGV_ACCERR at 0x9f069184
Crashed Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0x000027d8 objc_msgSend + 16
1 CoreFoundation 0x0007d749 ____CFXNotificationPost_old_block_invoke_1 + 45
2 libSystem.B.dylib 0x000d5984 _dispatch_call_block_and_release + 20
3 libSystem.B.dylib 0x000d66b0 _dispatch_continuation_pop + 72
4 libSystem.B.dylib 0x000d69fc _dispatch_main_queue_callback_4CF + 220
5 CoreFoundation 0x0002789b __CFRunLoopRun + 1335
6 CoreFoundation 0x00027277 CFRunLoopRunSpecific + 231
7 CoreFoundation 0x0002717f CFRunLoopRunInMode + 59
8 GraphicsServices 0x000045f3 GSEventRunModal + 115
9 GraphicsServices 0x0000469f GSEventRun + 63
10 UIKit 0x00004123 -[UIApplication _run] + 403
11 UIKit 0x0000212f UIApplicationMain + 671
12 MyApp 0x000024e3 main (main.m:17)
I have since managed to get a little more info, but not much.
2012-02-12 18:03:04.556 MyApp[462:307] (null): unrecognized selector sent to class 0x3e0a360c
2012-02-12 18:03:04.618 MyApp[462:307] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '(null): unrecognized selector sent to class 0x3e0a360c'
*** Call stack at first throw:
(
0 CoreFoundation 0x33506ed3 __exceptionPreprocess + 114
1 libobjc.A.dylib 0x30412811 objc_exception_throw + 24
2 CoreFoundation 0x335086ff +[NSObject(NSObject) doesNotRecognizeSelector:] + 102
3 CoreFoundation 0x334b01d9 ___forwarding___ + 508
4 CoreFoundation 0x334aff90 _CF_forwarding_prep_0 + 48
5 Foundation 0x302a86b3 _nsnote_callback + 142
6 CoreFoundation 0x334e4749 ____CFXNotificationPost_old_block_invoke_1 + 44
7 libSystem.B.dylib 0x31d05984 _dispatch_call_block_and_release + 20
8 libSystem.B.dylib 0x31d066b0 _dispatch_continuation_pop + 72
9 libSystem.B.dylib 0x31d069fc _dispatch_main_queue_callback_4CF + 220
10 CoreFoundation 0x3348e89b __CFRunLoopRun + 1334
11 CoreFoundation 0x3348e277 CFRunLoopRunSpecific + 230
12 CoreFoundation 0x3348e17f CFRunLoopRunInMode + 58
13 GraphicsServices 0x31b5e5f3 GSEventRunModal + 114
14 GraphicsServices 0x31b5e69f GSEventRun + 62
15 UIKit 0x341bd123 -[UIApplication _run] + 402
16 UIKit 0x341bb12f UIApplicationMain + 670
Now all of my addObservers are block based so I can't see why it would lead to an unrecognised selector.
This way won't help us much while Debugging crash. I found one of the best way to Debug the code for Crash. Follow the link for debugging technique:
https://cocoadev.com/DebuggingAutorelease.html
You need to analyze your Console very carefully to see actually why the Crash occurs. This helped me in almost all of the Code that are without ARC enabled.