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POWhy did this app crash while in the background?
 

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  1. POWhy did this app crash while in the background?
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    <p>My app uses background location for GPS updates. I've registered it for background location updates, and while it's running in background, it always crashes like this.</p> <p>Since I haven't written most of this code, I really have no idea what happened.</p> <p>I have checked the memory allocations and there doesn't seem to be much of a problem there. Here's a crash report:</p> <pre><code>Incident Identifier: 39F6F622-1274-4B6C-BA19-32D10E04E309 CrashReporter Key: 4757f4c5e5f009daf18eb0c512f729356c3e5de4 Hardware Model: iPhone3,1 Process: Get Off Now! [3040] Path: /var/mobile/Applications/43D41F77-B225-4F47-AFB0-D2F2E00E18DF/Get Off Now!.app/Get Off Now! Identifier: Get Off Now! Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2010-12-22 13:31:29.293 +0800 OS Version: iPhone OS 4.1 (8B117) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000d Crashed Thread: 0 Thread 0 Crashed: 0 libobjc.A.dylib 0x000027d8 objc_msgSend + 16 1 CoreFoundation 0x000042ae CFRetain + 62 2 CoreFoundation 0x0005ab58 CFMessagePortInvalidate + 304 3 CoreFoundation 0x0005b05e CFMessagePortIsValid + 42 4 CoreLocation 0x000030f8 CLClientIsValid + 12 5 CoreLocation 0x00004b10 CLClientSendAndCache(__CLClient*, CLDaemonCommType, void*, int, unsigned char, unsigned char) + 40 6 CoreLocation 0x000051cc CLClientHandleWatchdogTimerExpiry(__CFRunLoopTimer*, void*) + 24 7 CoreFoundation 0x000567f4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 8 8 CoreFoundation 0x000562a6 __CFRunLoopDoTimer + 854 9 CoreFoundation 0x0002779e __CFRunLoopRun + 1082 10 CoreFoundation 0x00027270 CFRunLoopRunSpecific + 224 11 CoreFoundation 0x00027178 CFRunLoopRunInMode + 52 12 GraphicsServices 0x000045ec GSEventRunModal + 108 13 GraphicsServices 0x00004698 GSEventRun + 56 14 UIKit 0x0000411c -[UIApplication _run] + 396 15 UIKit 0x00002128 UIApplicationMain + 664 16 Get Off Now! 0x00002406 0x1000 + 5126 17 Get Off Now! 0x000023d0 0x1000 + 5072 Thread 1: 0 libSystem.B.dylib 0x0002d330 kevent + 24 1 libSystem.B.dylib 0x000d6b6c _dispatch_mgr_invoke + 88 2 libSystem.B.dylib 0x000d65bc _dispatch_queue_invoke + 96 3 libSystem.B.dylib 0x000d675c _dispatch_worker_thread2 + 120 4 libSystem.B.dylib 0x0007a67a _pthread_wqthread + 258 5 libSystem.B.dylib 0x00073190 start_wqthread + 0 Thread 2: 0 libSystem.B.dylib 0x00000cf4 semaphore_wait_signal_trap + 8 1 libSystem.B.dylib 0x0002e4ee semaphore_wait_signal + 2 2 libSystem.B.dylib 0x00002ae4 pthread_mutex_lock + 248 3 WebCore 0x00002620 _WebTryThreadLock(bool) + 140 4 WebCore 0x00002566 WebRunLoopLock(__CFRunLoopObserver*, unsigned long, void*) + 18 5 CoreFoundation 0x00030236 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 10 6 CoreFoundation 0x000300aa __CFRunLoopDoObservers + 406 7 CoreFoundation 0x000276c0 __CFRunLoopRun + 860 8 CoreFoundation 0x00027270 CFRunLoopRunSpecific + 224 9 CoreFoundation 0x00027178 CFRunLoopRunInMode + 52 10 WebCore 0x000024e2 RunWebThread(void*) + 362 11 libSystem.B.dylib 0x0007a27e _pthread_start + 242 12 libSystem.B.dylib 0x0006f2a8 thread_start + 0 Thread 3: 0 libSystem.B.dylib 0x0007b19c __workq_kernreturn + 8 1 libSystem.B.dylib 0x0007a790 _pthread_wqthread + 536 2 libSystem.B.dylib 0x00073190 start_wqthread + 0 Thread 4: 0 libSystem.B.dylib 0x0007b19c __workq_kernreturn + 8 1 libSystem.B.dylib 0x0007a790 _pthread_wqthread + 536 2 libSystem.B.dylib 0x00073190 start_wqthread + 0 Thread 0 crashed with ARM Thread State: r0: 0x001a01c0 r1: 0x33024270 r2: 0x00000005 r3: 0x3002d7c9 r4: 0x00000005 r5: 0x3e1af5e4 r6: 0x00000017 r7: 0x2fffeac0 r8: 0x00000004 r9: 0x001fc098 r10: 0x00855864 r11: 0x2fffeb48 ip: 0x3e19c3f0 sp: 0x2fffeaa8 lr: 0x307fc2b5 pc: 0x3002d7d8 cpsr: 0x20000030 </code></pre> <p>This is another way it crashes; it looks the same, except it uses 100% CPU for a long time:</p> <pre><code>Incident Identifier: 61B42F36-021F-48D2-B180-112527BAE5CF CrashReporter Key: 4757f4c5e5f009daf18eb0c512f729356c3e5de4 Hardware Model: iPhone3,1 Process: Get Off Now! [3751] Path: /var/mobile/Applications/43D41F77-B225-4F47-AFB0-D2F2E00E18DF/Get Off Now!.app/Get Off Now! Identifier: Get Off Now! Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2010-12-23 13:06:50.363 +0800 OS Version: iPhone OS 4.1 (8B117) Report Version: 104 Exception Type: 00000020 Exception Codes: 0x8badf00d Highlighted Thread: 0 Application Specific Information: Get Off Now![3751] has active assertions beyond permitted time: {( &lt;SBProcessAssertion: 0xca2a8a0&gt; identifier: CoreLocationRegistration process: Get Off Now![3751] permittedBackgroundDuration: 600.000000 reason: finishTask owner pid:3751 preventSuspend preventIdleSleep )} Elapsed total CPU time (seconds): 600.010 (user 19.350, system 580.660), 100% CPU Elapsed application CPU time (seconds): 575.320, 96% CPU Thread 0: 0 libSystem.B.dylib 0x00004f0c OSSpinLockLock + 44 1 CoreFoundation 0x0005aa42 CFMessagePortInvalidate + 26 2 CoreFoundation 0x0005b05e CFMessagePortIsValid + 42 3 CoreLocation 0x000030f8 CLClientIsValid + 12 4 CoreLocation 0x00004b10 CLClientSendAndCache(__CLClient*, CLDaemonCommType, void*, int, unsigned char, unsigned char) + 40 5 CoreLocation 0x000051cc CLClientHandleWatchdogTimerExpiry(__CFRunLoopTimer*, void*) + 24 6 CoreFoundation 0x000567f4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 8 7 CoreFoundation 0x000562a6 __CFRunLoopDoTimer + 854 8 CoreFoundation 0x0002779e __CFRunLoopRun + 1082 9 CoreFoundation 0x00027270 CFRunLoopRunSpecific + 224 10 CoreFoundation 0x00027178 CFRunLoopRunInMode + 52 11 GraphicsServices 0x000045ec GSEventRunModal + 108 12 GraphicsServices 0x00004698 GSEventRun + 56 13 UIKit 0x0000411c -[UIApplication _run] + 396 14 UIKit 0x00002128 UIApplicationMain + 664 15 Get Off Now! 0x000022de main (main.m:13) 16 Get Off Now! 0x000022a8 start + 32 Thread 1: 0 libSystem.B.dylib 0x0002d330 kevent + 24 1 libSystem.B.dylib 0x000d6b6c _dispatch_mgr_invoke + 88 2 libSystem.B.dylib 0x000d65bc _dispatch_queue_invoke + 96 3 libSystem.B.dylib 0x000d675c _dispatch_worker_thread2 + 120 4 libSystem.B.dylib 0x0007a67a _pthread_wqthread + 258 5 libSystem.B.dylib 0x00073190 start_wqthread + 0 Thread 2: 0 libSystem.B.dylib 0x00000c98 mach_msg_trap + 20 1 libSystem.B.dylib 0x00002d64 mach_msg + 44 2 CoreFoundation 0x00027c38 __CFRunLoopServiceMachPort + 88 3 CoreFoundation 0x000274c2 __CFRunLoopRun + 350 4 CoreFoundation 0x00027270 CFRunLoopRunSpecific + 224 5 CoreFoundation 0x00027178 CFRunLoopRunInMode + 52 6 WebCore 0x000024e2 RunWebThread(void*) + 362 7 libSystem.B.dylib 0x0007a27e _pthread_start + 242 8 libSystem.B.dylib 0x0006f2a8 thread_start + 0 Unknown thread crashed with unknown flavor: 5, state_count: 1 </code></pre>
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    1. USJesse Beder
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    1. COJust as a tip, you don't need all of those `<br>`s you added to fix your formatting. Just select the text and tap the code button: **{}** (If you really want two lines together to linebreak and don't want to use the code formatting just put two spaces at the end of each line.)
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      1. POWhy did this app crash while in the background?
      1. USMatthew Frederick
    2. COTo address your problem, is this under iOS 4.1 by chance? There's a known bug in the location manager in 4.1.
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      1. POWhy did this app crash while in the background?
      1. USMatthew Frederick
    3. COthis is built based on iOS 4.0, but running on my iPhone 4 OS4.1 and iPad OS 4.2.1. It's interesting phenominon that OS4.2.1 crashed much less often. What is that bug about?
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