Question
I am developing an iPad application, I am facing a crash issue, but unable to find the cause behind it.
After crash it points to main.mm file only.
Try:
https://stackoverflow.com/questions/20329333
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Below is the crash log. As of my knowledge, it is using some memory location which has already been freed. But how to identify, which object it is?
Incident Identifier: AF769A76-ADB4-4C3C-9A94-E0B45A994B42
CrashReporter Key: 7443d58afe6b6a3df23c273ba834f8ae4814a7ce
Hardware Model: iPad2,1
Process: BLSOffline [3255]
Path: /var/mobile/Applications/A4C2BB5D-0FE4-4A4D-B1D6-FF6E0183F4EE/BLSOffline.app/BLSOffline
Identifier: com.bentley.LearnInHouse
Version: 1.0 (1.0)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2013-12-02 18:29:21.692 +0530
OS Version: iOS 7.0.4 (11B554a)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x6192010b
Triggered by Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0x3a92db26 objc_msgSend + 6
1 MediaPlayer 0x314a2540 -[MPMoviePlayerControllerNew _moviePlayerWillBecomeActiveNotification:] + 472
2 CoreFoundation 0x30223116 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 10
3 CoreFoundation 0x30197252 _CFXNotificationPost + 1714
4 Foundation 0x30b7cc28 -[NSNotificationCenter postNotificationName:object:userInfo:] + 72
5 MediaPlayer 0x314a4a60 -[MPMoviePlayerControllerNew _postNotificationName:object:userInfo:] + 96
6 MediaPlayer 0x314a49f0 -[MPMoviePlayerControllerNew _postNotificationName:object:] + 40
7 MediaPlayer 0x314a43d4 -[MPMoviePlayerControllerNew _ensureActive] + 128
8 MediaPlayer 0x314a44a2 -[MPMoviePlayerControllerNew _prepareToPlayWithStartIndex:] + 66
9 MediaPlayer 0x314a009c -[MPMoviePlayerControllerNew prepareToPlay] + 40
10 MediaPlayer 0x314a0100 -[MPMoviePlayerControllerNew play] + 44
11 MediaPlayer 0x314a2b2e -[MPMoviePlayerControllerNew _movieSourceTypeAvailableNotification:] + 350
12 CoreFoundation 0x30223116 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 10
13 CoreFoundation 0x30197252 _CFXNotificationPost + 1714
14 Foundation 0x30b7cc28 -[NSNotificationCenter postNotificationName:object:userInfo:] + 72
15 Foundation 0x30b81506 -[NSNotificationCenter postNotificationName:object:] + 26
16 MediaPlayer 0x31525b00 -[MPMovie _determineMediaType] + 152
17 Foundation 0x30c3b386 __NSFireDelayedPerform + 410
18 CoreFoundation 0x3022c0dc __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 12
19 CoreFoundation 0x3022bcf2 __CFRunLoopDoTimer + 778
20 CoreFoundation 0x3022a08e __CFRunLoopRun + 1206
21 CoreFoundation 0x30194c22 CFRunLoopRunSpecific + 518
22 CoreFoundation 0x30194a06 CFRunLoopRunInMode + 102
23 GraphicsServices 0x34e6827e GSEventRunModal + 134
24 UIKit 0x32a38044 UIApplicationMain + 1132
25 BLSOffline 0x00116c0e 0xee000 + 166926
26 libdyld.dylib 0x3ae3aab4 start + 0
Thread 1 name: gputools.smt_poll.0x14632d20
Thread 1:
0 libsystem_kernel.dylib 0x3aef1550 __semwait_signal + 24
1 libsystem_c.dylib 0x3ae62808 nanosleep + 168
2 libsystem_c.dylib 0x3ae62756 usleep + 46
3 GPUToolsCore 0x02292f34 smt_poll_thread_entry(void*) + 120
4 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
5 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
6 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 2:
0 libsystem_kernel.dylib 0x3aede83c kevent64 + 24
1 libdispatch.dylib 0x3ae1f210 _dispatch_mgr_invoke + 228
2 libdispatch.dylib 0x3ae1ef96 _dispatch_mgr_thread$VARIANT$mp + 34
Thread 3 name: WebThread
Thread 3:
0 libsystem_kernel.dylib 0x3aef0fa8 __psynch_mutexwait + 24
1 libsystem_pthread.dylib 0x3af57f0a _pthread_mutex_lock + 302
2 WebCore 0x383037f0 _WebTryThreadLock(bool) + 104
3 WebCore 0x38303772 WebRunLoopLock(__CFRunLoopObserver*, unsigned long, void*) + 42
4 CoreFoundation 0x3022c1ca __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 18
5 CoreFoundation 0x30229b6c __CFRunLoopDoObservers + 280
6 CoreFoundation 0x30229f7c __CFRunLoopRun + 932
7 CoreFoundation 0x30194c22 CFRunLoopRunSpecific + 518
8 CoreFoundation 0x30194a06 CFRunLoopRunInMode + 102
9 WebCore 0x38302266 RunWebThread(void*) + 414
10 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
11 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
12 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 4:
0 libsystem_kernel.dylib 0x3aedea8c mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3aede888 mach_msg + 44
2 CoreFoundation 0x3022b7be __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x30229ee4 __CFRunLoopRun + 780
4 CoreFoundation 0x30194c22 CFRunLoopRunSpecific + 518
5 CoreFoundation 0x30194a06 CFRunLoopRunInMode + 102
6 libAVFAudio.dylib 0x2f217584 GenericRunLoopThread::Entry(void*) + 124
7 libAVFAudio.dylib 0x2f20b99c CAPThread::Entry(CAPThread*) + 176
8 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
9 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
10 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 5 name: JavaScriptCore::BlockFree
Thread 5:
0 libsystem_kernel.dylib 0x3aef0f38 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x3af59224 _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x3af5a000 pthread_cond_wait + 36
3 JavaScriptCore 0x311b9d50 JSC::BlockAllocator::blockFreeingThreadMain() + 204
4 JavaScriptCore 0x311b73a0 WTF::wtfThreadEntryPoint(void*) + 12
5 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
6 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
7 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 6 name: JavaScriptCore::Marking
Thread 6:
0 libsystem_kernel.dylib 0x3aef0f38 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x3af59224 _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x3af5a000 pthread_cond_wait + 36
3 JavaScriptCore 0x31355236 JSC::GCThread::waitForNextPhase() + 74
4 JavaScriptCore 0x31355290 JSC::GCThread::gcThreadMain() + 48
5 JavaScriptCore 0x311b73a0 WTF::wtfThreadEntryPoint(void*) + 12
6 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
7 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
8 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 7 name: WebCore: CFNetwork Loader
Thread 7:
0 libsystem_kernel.dylib 0x3aedea8c mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3aede888 mach_msg + 44
2 CoreFoundation 0x3022b7be __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x30229ee4 __CFRunLoopRun + 780
4 CoreFoundation 0x30194c22 CFRunLoopRunSpecific + 518
5 CoreFoundation 0x30194a06 CFRunLoopRunInMode + 102
6 WebCore 0x3834ad5a WebCore::runLoaderThread(void*) + 250
7 JavaScriptCore 0x311b73a0 WTF::wtfThreadEntryPoint(void*) + 12
8 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
9 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
10 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 8 name: com.apple.NSURLConnectionLoader
Thread 8:
0 libsystem_kernel.dylib 0x3aedea8c mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3aede888 mach_msg + 44
2 CoreFoundation 0x3022b7be __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x30229ee4 __CFRunLoopRun + 780
4 CoreFoundation 0x30194c22 CFRunLoopRunSpecific + 518
5 CoreFoundation 0x30194a06 CFRunLoopRunInMode + 102
6 Foundation 0x30bcf2f2 +[NSURLConnection(Loader) _resourceLoadLoop:] + 314
7 Foundation 0x30c44c82 __NSThread__main__ + 1058
8 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
9 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
10 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 9 name: com.apple.CFSocket.private
Thread 9:
0 libsystem_kernel.dylib 0x3aef1440 __select + 20
1 CoreFoundation 0x3022f680 __CFSocketManager + 480
2 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
3 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
4 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 10 name: WebCore: LocalStorage
Thread 10:
0 libsystem_kernel.dylib 0x3aef0f38 __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x3af59224 _pthread_cond_wait + 536
2 libsystem_pthread.dylib 0x3af5a000 pthread_cond_wait + 36
3 JavaScriptCore 0x311b9e82 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 58
4 WebCore 0x384353a8 WTF::PassOwnPtr<WTF::Function<void ()> > WTF::MessageQueue<WTF::Function<void ()> >::waitForMessageFilteredWithTimeout<bool (WTF::Function<void ()>*)>(WTF::MessageQueueWaitResult&, bool (&)(WTF::Function<void ()>*), double) + 104
5 WebCore 0x3843532e WebCore::StorageThread::threadEntryPoint() + 162
6 JavaScriptCore 0x311b73a0 WTF::wtfThreadEntryPoint(void*) + 12
7 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
8 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
9 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 11 name: com.apple.coremedia.player.async
Thread 11:
0 libsystem_kernel.dylib 0x3aedeadc semaphore_wait_trap + 8
1 libdispatch.dylib 0x3ae1d428 _dispatch_semaphore_wait_slow + 172
2 MediaToolbox 0x3168083c fpa_AsyncMovieControlThread + 1752
3 CoreMedia 0x307bf234 figThreadMain + 192
4 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
5 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
6 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 12 name: com.apple.coremedia.player.remote
Thread 12:
0 libsystem_kernel.dylib 0x3aedea8c mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3aede888 mach_msg + 44
2 MediaToolbox 0x31686c58 FigExpressNotificationThread + 84
3 CoreMedia 0x307bf234 figThreadMain + 192
4 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
5 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
6 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 13:
0 libsystem_kernel.dylib 0x3aef1c7c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3af57dc6 _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3af57c80 start_wqthread + 4
Thread 14:
0 libsystem_kernel.dylib 0x3aef1c7c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3af57dc6 _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3af57c80 start_wqthread + 4
Thread 15 name: com.apple.coremedia.player.async
Thread 15:
0 libsystem_kernel.dylib 0x3aedeadc semaphore_wait_trap + 8
1 libdispatch.dylib 0x3ae1d428 _dispatch_semaphore_wait_slow + 172
2 MediaToolbox 0x3168083c fpa_AsyncMovieControlThread + 1752
3 CoreMedia 0x307bf234 figThreadMain + 192
4 libsystem_pthread.dylib 0x3af59c1a _pthread_body + 138
5 libsystem_pthread.dylib 0x3af59b8a _pthread_start + 98
6 libsystem_pthread.dylib 0x3af57c8c thread_start + 4
Thread 16:
0 libsystem_kernel.dylib 0x3aef1c7c __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3af57dc6 _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3af57c80 start_wqthread + 4
Thread 0 crashed with ARM Thread State (32-bit):
r0: 0x145cb7d0 r1: 0x31617754 r2: 0x3b3091a0 r3: 0x00000000
r4: 0x1918aea0 r5: 0x145cb7d0 r6: 0x00000000 r7: 0x27d134f8
r8: 0x00000000 r9: 0x619200ff r10: 0x31617754 r11: 0x145cb7ec
ip: 0x3b2cd2a4 sp: 0x27d134c0 lr: 0x314a2545 pc: 0x3a92db26
cpsr: 0x60000030
Solution
It seems as if you are forgetting to remove an observer for the movie callbacks:
-(void) dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
It's likely that the movie player (via NSNotificationCenter) is the object that is using some memory location which has already been freed when it tries to notify its observers
