iphone - MyApp "has active assertions beyond permitted time"崩溃 - CoreLocationRegistration 和 CoreLocationBackgroundClient

Question

有谁知道为什么会发生此崩溃日志？该应用程序记录用户去过的位置。因此它在 Info.plist 中设置了 UIBackgroundModes 的位置，以继续在后台获取位置更新。根据日志，10 分钟后似乎出现了崩溃。

Incident Identifier: 4BA294E8-0DDF-4EC2-812A-20394F758A7F
CrashReporter Key:   59997a4e160853691bc673802439c8c4b9ca7ba3
Hardware Model:      iPhone3,1
Process:         MyMapApp [1234]
Path:            /var/mobile/Applications/826E35FE-F6B7-477E-943E-CE18D0D03145/MyMapApp.app/MyMapApp
Identifier:      MyMapApp
Version:         ??? (???)
Code Type:       ARM (Native)
Parent Process:  launchd [1]

Date/Time:       2011-03-02 13:25:05.228 -0600
OS Version:      iPhone OS 4.2.1 (8C148)
Report Version:  104

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

Application Specific Information:
MyMapApp[1234] has active assertions beyond permitted time: 
{(
    <SBProcessAssertion: 0x63a07a0> identifier: CoreLocationRegistration process: MyMapApp[1234] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1234 preventSuspend  preventIdleSleep ,
    <SBProcessAssertion: 0xa095050> identifier: CoreLocationBackgroundClient process: MyMapApp[1234] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:1234 preventSuspend  preventIdleSleep 
)}

Elapsed total CPU time (seconds): 43.660 (user 17.920, system 25.740), 7% CPU 
Elapsed application CPU time (seconds): 1.500, 0% CPU

Thread 0:
0   libSystem.B.dylib               0x33b5d268 mach_msg_trap + 20
1   libSystem.B.dylib               0x33b5f354 mach_msg + 44
2   CoreFoundation                  0x33a48648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x33a47ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x33a47c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x33a47b88 CFRunLoopRunInMode + 52
6   GraphicsServices                0x33b0e4a4 GSEventRunModal + 108
7   GraphicsServices                0x33b0e550 GSEventRun + 56
8   UIKit                           0x32099322 -[UIApplication _run] + 406
9   UIKit                           0x32096e8c UIApplicationMain + 664
10  MyMapApp                    0x00105546 main (main.m:50)
11  MyMapApp                    0x00003f4c start + 44

Thread 1:
0   libSystem.B.dylib               0x33b89974 kevent + 24
1   libSystem.B.dylib               0x33c33704 _dispatch_mgr_invoke + 88
2   libSystem.B.dylib               0x33c33174 _dispatch_queue_invoke + 96
3   libSystem.B.dylib               0x33c32b98 _dispatch_worker_thread2 + 120
4   libSystem.B.dylib               0x33bd724a _pthread_wqthread + 258
5   libSystem.B.dylib               0x33bcf970 start_wqthread + 0

Thread 2:
0   libSystem.B.dylib               0x33b5d268 mach_msg_trap + 20
1   libSystem.B.dylib               0x33b5f354 mach_msg + 44
2   CoreFoundation                  0x33a48648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x33a47ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x33a47c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x33a47b88 CFRunLoopRunInMode + 52
6   WebCore                         0x304df124 RunWebThread(void*) + 332
7   libSystem.B.dylib               0x33bd6886 _pthread_start + 242
8   libSystem.B.dylib               0x33bcba88 thread_start + 0

Thread 3:
0   libSystem.B.dylib               0x33b5d268 mach_msg_trap + 20
1   libSystem.B.dylib               0x33b5f354 mach_msg + 44
2   CoreFoundation                  0x33a48648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x33a47ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x33a47c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x33a47b88 CFRunLoopRunInMode + 52
6   Foundation                      0x336465f6 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 206
7   Foundation                      0x33624192 -[NSThread main] + 38
8   Foundation                      0x3361d242 __NSThread__main__ + 966
9   libSystem.B.dylib               0x33bd6886 _pthread_start + 242
10  libSystem.B.dylib               0x33bcba88 thread_start + 0

Thread 4:
0   libSystem.B.dylib               0x33bd59f0 __semwait_signal + 24
1   libSystem.B.dylib               0x33b8a7ec _pthread_cond_wait + 748
2   libSystem.B.dylib               0x33b8a3d2 pthread_cond_wait + 26
3   CoreMedia                       0x31a41b14 WaitOnCondition + 4
4   CoreMedia                       0x31a41a5a FigSemaphoreWaitRelative + 66
5   MediaToolbox                    0x300c0c9c fpa_AsyncMovieControlThread + 48
6   CoreMedia                       0x31a5df76 figThreadMain + 166
7   libSystem.B.dylib               0x33bd6886 _pthread_start + 242
8   libSystem.B.dylib               0x33bcba88 thread_start + 0

Thread 5:
0   libSystem.B.dylib               0x33b8168c select$DARWIN_EXTSN + 20
1   CoreFoundation                  0x33a7f662 __CFSocketManager + 582
2   libSystem.B.dylib               0x33bd6886 _pthread_start + 242
3   libSystem.B.dylib               0x33bcba88 thread_start + 0

Thread 6:
0   libSystem.B.dylib               0x33b5d268 mach_msg_trap + 20
1   libSystem.B.dylib               0x33b5f354 mach_msg + 44
2   CoreFoundation                  0x33a48648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x33a47ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x33a47c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x33a47b88 CFRunLoopRunInMode + 52
6   MapKit                          0x31be8906 TileCachePrivate::runCacheThread() + 274
7   MapKit                          0x31be87ea _runCacheThread(void*) + 2
8   libSystem.B.dylib               0x33bd6886 _pthread_start + 242
9   libSystem.B.dylib               0x33bcba88 thread_start + 0

Thread 7:
0   libSystem.B.dylib               0x33bd59f0 __semwait_signal + 24
1   libSystem.B.dylib               0x33b8a7ec _pthread_cond_wait + 748
2   libSystem.B.dylib               0x33b8a3d2 pthread_cond_wait + 26
3   QuartzCore                      0x3412e5dc CA::DispatchGroup::thread(void*) + 84
4   QuartzCore                      0x340fb01a thread_fun + 10
5   libSystem.B.dylib               0x33bd6886 _pthread_start + 242
6   libSystem.B.dylib               0x33bcba88 thread_start + 0

Thread 8:
0   libSystem.B.dylib               0x33b5d268 mach_msg_trap + 20
1   libSystem.B.dylib               0x33b5f354 mach_msg + 44
2   CoreFoundation                  0x33a48648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x33a47ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x33a47c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x33a47b88 CFRunLoopRunInMode + 52
6   MapKit                          0x31bf327e +[NSThread(MKAdditions) _mapkit_runThread:] + 334
7   Foundation                      0x33624192 -[NSThread main] + 38
8   Foundation                      0x3361d242 __NSThread__main__ + 966
9   libSystem.B.dylib               0x33bd6886 _pthread_start + 242
10  libSystem.B.dylib               0x33bcba88 thread_start + 0

Thread 9:
0   libSystem.B.dylib               0x33b5d268 mach_msg_trap + 20
1   libSystem.B.dylib               0x33b5f354 mach_msg + 44
2   CoreFoundation                  0x33a48648 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x33a47ed2 __CFRunLoopRun + 350
4   CoreFoundation                  0x33a47c80 CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x33a47b88 CFRunLoopRunInMode + 52
6   AudioToolbox                    0x316504ba GenericRunLoopThread::RunLoop() + 30
7   AudioToolbox                    0x31663306 TRunLoop<AQClient>::Entry(void*) + 90
8   AudioToolbox                    0x316501d2 CAPThread::Entry(CAPThread*) + 138
9   libSystem.B.dylib               0x33bd6886 _pthread_start + 242
10  libSystem.B.dylib               0x33bcba88 thread_start + 0

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

Answer 1

您是否有机会调用 beginBackgroundTaskWithExpirationHandler: 而不调用相应的 endBackgroundTask:？

http://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html