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Audio Streaming in background crash the app

I am using DigitalDj's AudioStreamer project (https://github.com/DigitalDJ/AudioStreamer) to stream audio in the background in my application. Everything works fine when the app is in the foreground but sometimes it gets crashed in back ground. Here is a very strange crash log.

     Incident Identifier: F6F6B97C-1943-460D-8A4E-5608B47E6989
CrashReporter Key:   3a88f20a9e18f468445bddc212b7aa673c6dc89b
Hardware Model:      iPod4,1
Process:         iMixtapes [1075]
Path:            /var/mobile/Applications/7C64D2D8-0C63-4A73-8452-763209481693/iMixtapes.app/iMixtapes
Identifier:      iMixtapes
Version:         ??? (???)
Code Type:       ARM (Native)
Parent Process:  launchd [1]

Date/Time:       2011-02-18 13:24:15.849 +0530
OS Version:      iPhone OS 4.2.1 (8C148)
Report Version:  104

Exception Type:  00000020
Exception Codes: 0x8badf00d
Highlighted Thread:  6

Application Specific Information:
iMixtapes[1075] has active assertions beyond permitted time: 
{(
    <SBProcessAssertion: 0x66ce420> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66f2970> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66c60b0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b4970> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66c7850> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66e55a0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66c5e40> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b47d0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66eaba0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66ebfe0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66f1da0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66afb90> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b18b0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x275940> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b1820> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x2c88a0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b7b70> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b7700> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66c6230> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66793a0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66ad010> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66c7820> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b7d20> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b7180> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66f2530> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66f2720> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b72a0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66f21e0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66f2650> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b73c0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b7830> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x6691270> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66c6010> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66b1ac0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x2733f0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0x66e74e0> identifier: UIKitBackgroundCompletionTask process: iMixtapes[1075] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1075 preventSuspend  preventIdleSleep 
)}

Elapsed total CPU time (seconds): 86.390 (user 41.340, system 45.050), 14% CPU 
Elapsed application CPU time (seconds): 6.290, 1% CPU

Thread 0:
0   libSystem.B.dylib               0x31093268 mach_msg_trap + 20
1   libSystem.B.dylib               0x31095354 mach_msg + 44
2   CoreFoundation                  0x30416648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x30415ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x30415c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x30415b88 CFRunLoopRunInMode + 52
6   GraphicsServices                0x31eec4a4 GSEventRunModal + 108
7   GraphicsServices                0x31eec550 GSEventRun + 56
8   UIKit                           0x313cf322 -[UIApplication _run] + 406
9   UIKit                           0x313cce8c UIApplicationMain + 664
10  iMixtapes                       0x00002348 main (main.m:14)
11  iMixtapes                       0x000022fc start + 32

Thread 1:
0   libSystem.B.dylib               0x310bf974 kevent + 24
1   libSystem.B.dylib               0x31169704 _dispatch_mgr_invoke + 88
2   libSystem.B.dylib               0x31169174 _dispatch_queue_invoke + 96
3   libSystem.B.dylib               0x31168b98 _dispatch_worker_thread2 + 120
4   libSystem.B.dylib               0x3110d24a _pthread_wqthread + 258
5   libSystem.B.dylib               0x31105970 start_wqthread + 0

Thread 2:
0   libSystem.B.dylib               0x31093268 mach_msg_trap + 20
1   libSystem.B.dylib               0x31095354 mach_msg + 44
2   CoreFoundation                  0x30416648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x30415ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x30415c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x30415b88 CFRunLoopRunInMode + 52
6   WebCore                         0x35b32124 RunWebThread(void*) + 332
7   libSystem.B.dylib               0x3110c886 _pthread_start + 242
8   libSystem.B.dylib               0x31101a88 thread_start + 0

Thread 3:
0   libSystem.B.dylib               0x31093268 mach_msg_trap + 20
1   libSystem.B.dylib               0x31095354 mach_msg + 44
2   CoreFoun开发者_Python百科dation                  0x30416648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x30415ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x30415c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x30415b88 CFRunLoopRunInMode + 52
6   Foundation                      0x302fb5f6 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 206
7   Foundation                      0x302d9192 -[NSThread main] + 38
8   Foundation                      0x302d2242 __NSThread__main__ + 966
9   libSystem.B.dylib               0x3110c886 _pthread_start + 242
10  libSystem.B.dylib               0x31101a88 thread_start + 0

Thread 4:
0   libSystem.B.dylib               0x3110b9f0 __semwait_signal + 24
1   libSystem.B.dylib               0x310c07ec _pthread_cond_wait + 748
2   libSystem.B.dylib               0x310c03d2 pthread_cond_wait + 26
3   CoreMedia                       0x3290cb14 WaitOnCondition + 4
4   CoreMedia                       0x3290ca5a FigSemaphoreWaitRelative + 66
5   MediaToolbox                    0x32a8bc9c fpa_AsyncMovieControlThread + 48
6   CoreMedia                       0x32928f76 figThreadMain + 166
7   libSystem.B.dylib               0x3110c886 _pthread_start + 242
8   libSystem.B.dylib               0x31101a88 thread_start + 0

Thread 5:
0   libSystem.B.dylib               0x310b768c select$DARWIN_EXTSN + 20
1   CoreFoundation                  0x3044d662 __CFSocketManager + 582
2   libSystem.B.dylib               0x3110c886 _pthread_start + 242
3   libSystem.B.dylib               0x31101a88 thread_start + 0

Thread 6:
0   libSystem.B.dylib               0x3110b9f0 __semwait_signal + 24
1   libSystem.B.dylib               0x310c07ec _pthread_cond_wait + 748
2   libSystem.B.dylib               0x310c03d2 pthread_cond_wait + 26
3   iMixtapes                       0x000946d8 -[AudioStreamer enqueueBuffer] (AudioStreamer.m:1885)
4   iMixtapes                       0x00095514 -[AudioStreamer handleAudioPackets:numberBytes:numberPackets:packetDescriptions:] (AudioStreamer.m:2196)
5   iMixtapes                       0x0008f4ce MyPacketsProc (AudioStreamer.m:151)
6   AudioToolbox                    0x3281e376 AudioFileStreamWrapper::CallPacketsProc(unsigned long, unsigned long, void const*, AudioStreamPacketDescription*, bool) + 122
7   AudioToolbox                    0x3283a87a MP3AudioStream::GeneratePackets(AudioFileStreamContinuation&) + 818
8   AudioToolbox                    0x3281e5e4 AudioFileStreamWrapper::ParseBytes(unsigned long, void const*, unsigned long) + 180
9   AudioToolbox                    0x3281de6c AudioFileStreamParseBytes + 132
10  iMixtapes                       0x0009410e -[AudioStreamer handleReadFromStream:eventType:] (AudioStreamer.m:1754)
11  iMixtapes                       0x0008f58e ASReadStreamCallBack (AudioStreamer.m:222)
12  CoreFoundation                  0x3044ef6a _signalEventSync + 70
13  CoreFoundation                  0x3044f842 _cfstream_solo_signalEventSync + 58
14  CoreFoundation                  0x3044c7ee _CFStreamSignalEvent + 326
15  CoreFoundation                  0x3044c6a0 CFReadStreamSignalEvent + 4
16  CFNetwork                       0x32fe2a66 HTTPReadStream::streamEvent(unsigned long) + 94
17  CFNetwork                       0x32fe2adc HTTPReadStream::_streamCB(__CFReadStream*, unsigned long, void*) + 24
18  CoreFoundation                  0x3044ef6a _signalEventSync + 70
19  CoreFoundation                  0x3044eefe _cfstream_shared_signalEventSync + 198
20  CoreFoundation                  0x304447d6 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 6
21  CoreFoundation                  0x304165b0 __CFRunLoopDoSources0 + 376
22  CoreFoundation                  0x30415e54 __CFRunLoopRun + 224
23  CoreFoundation                  0x30415c80 CFRunLoopRunSpecific + 224
24  CoreFoundation                  0x30415b88 CFRunLoopRunInMode + 52
25  Foundation                      0x302d28e4 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 196
26  iMixtapes                       0x00091000 -[AudioStreamer startInternal] (AudioStreamer.m:843)
27  Foundation                      0x302d9192 -[NSThread main] + 38
28  Foundation                      0x302d2242 __NSThread__main__ + 966
29  libSystem.B.dylib               0x3110c886 _pthread_start + 242
30  libSystem.B.dylib               0x31101a88 thread_start + 0

Thread 7:
0   libSystem.B.dylib               0x31093268 mach_msg_trap + 20
1   libSystem.B.dylib               0x31095354 mach_msg + 44
2   CoreFoundation                  0x30416648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x30415ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x30415c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x30415b88 CFRunLoopRunInMode + 52
6   AudioToolbox                    0x327a84ba GenericRunLoopThread::RunLoop() + 30
7   AudioToolbox                    0x327bb306 TRunLoop<AQClient>::Entry(void*) + 90
8   AudioToolbox                    0x327a81d2 CAPThread::Entry(CAPThread*) + 138
9   libSystem.B.dylib               0x3110c886 _pthread_start + 242
10  libSystem.B.dylib               0x31101a88 thread_start + 0

Unknown thread crashed with unknown flavor: 5, state_count: 1

Can anybody please help me to resolve this issue.

Thanks


your app is being terminated, while the secondary thread continues to work. you have to clean up and terminate cleanly when requested.

note: you can symbolicate you crashes, to evaluate the callstack more easily.


When you are creating the background task to play the audio if you are using

- beginBackgroundTaskWithExpirationHandler:

make sure you code to end the task when you get the invalid notification from OS.

If u fail to handle that it will create the crash you have mentioned above.

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