应用程序在后台运行，与BLE设备通信。它在我们的测试中运行良好，但现在我们正在崩溃。 崩溃报告显示以下详细信息，此处发生线程15崩溃。
它显示与CPU周期有关。
Incident Identifier: 8F9083BF-497C-4441-BBB5-8554C875808A
CrashReporter Key: 0e515d51d2295f1e4cd5e5820df913a684243b28
Hardware Model: iPad2,6
Process: backboardd [1282]
Path: /usr/libexec/backboardd
Identifier: backboardd
Version: ???
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2014-06-10 14:19:52.920 -0700
OS Version: iOS 7.1.2 (11D257)
Report Version: 104
Exception Type: EXC_RESOURCE
Exception Subtype: CPU
Exception Message: (Limit 50%) Observed 85% over 180 secs
Triggered by Thread: 15
Thread 0:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81fb2 __CFRunLoopRun + 850
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fcecc9e CFRunLoopRunInMode + 102
6 backboardd 0x00046cb6 0x43000 + 15542
7 libdyld.dylib 0x3afa0ab4 start + 0
Thread 1:
0 libsystem_kernel.dylib 0x3b043808 kevent64 + 24
1 libdispatch.dylib 0x3af85078 _dispatch_mgr_invoke + 228
2 libdispatch.dylib 0x3af84dfe _dispatch_mgr_thread$VARIANT$mp + 34
Thread 2 name: com.apple.CoreAnimation.render-server
Thread 2:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 QuartzCore 0x322ef78c CA::Render::Server::server_thread(void*) + 180
3 QuartzCore 0x323677ce thread_fun + 14
4 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
5 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
6 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 3 name: com.apple.CoreAnimation.IOMFB.external
Thread 3:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81f6c __CFRunLoopRun + 780
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fd309ae CFRunLoopRun + 94
6 QuartzCore 0x32332c12 CA::WindowServer::IOMFBServer::thread_body(void*) + 282
7 QuartzCore 0x323677ce thread_fun + 14
8 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
9 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
10 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 4:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81f6c __CFRunLoopRun + 780
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fd309ae CFRunLoopRun + 94
6 IOMobileFramebuffer 0x35048452 iomfb_runloop_thread + 250
7 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
8 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
9 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 5 name: com.apple.CoreAnimation.IOMFB.wireless
Thread 5:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81f6c __CFRunLoopRun + 780
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fd309ae CFRunLoopRun + 94
6 QuartzCore 0x32332c12 CA::WindowServer::IOMFBServer::thread_body(void*) + 282
7 QuartzCore 0x323677ce thread_fun + 14
8 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
9 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
10 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 6 name: com.apple.CoreAnimation.IOMFB.primary
Thread 6:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81f6c __CFRunLoopRun + 780
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fd309ae CFRunLoopRun + 94
6 QuartzCore 0x32332c12 CA::WindowServer::IOMFBServer::thread_body(void*) + 282
7 QuartzCore 0x323677ce thread_fun + 14
8 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
9 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
10 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 7 name: IOHIDService - RunLoopCompatibilityThread
Thread 7:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81f6c __CFRunLoopRun + 780
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fd309ae CFRunLoopRun + 94
6 IOKit 0x30abd520 __IOHIDServiceRunLoopCompatibilityThread + 156
7 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
8 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
9 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 8:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81f6c __CFRunLoopRun + 780
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fd309ae CFRunLoopRun + 94
6 CoreMotion 0x303aa3a8 0x30371000 + 234408
7 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
8 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
9 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 9:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81f6c __CFRunLoopRun + 780
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fd309ae CFRunLoopRun + 94
6 backboardd 0x0004ea50 0x43000 + 47696
7 backboardd 0x0004ea7c 0x43000 + 47740
8 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
9 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
10 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 10:
0 libsystem_kernel.dylib 0x3b043a58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3b043854 mach_msg + 44
2 CoreFoundation 0x2fd83846 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2fd81f6c __CFRunLoopRun + 780
4 CoreFoundation 0x2fceceba CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2fd309ae CFRunLoopRun + 94
6 backboardd 0x0004ea50 0x43000 + 47696
7 backboardd 0x0004ea7c 0x43000 + 47740
8 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
9 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
10 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 11:
0 libsystem_kernel.dylib 0x3b043ac0 semaphore_timedwait_trap + 8
1 libdispatch.dylib 0x3af83208 _dispatch_semaphore_wait_slow + 120
2 libdispatch.dylib 0x3af8299e _dispatch_worker_thread + 110
3 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
4 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
5 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 12:
0 libsystem_kernel.dylib 0x3b043ac0 semaphore_timedwait_trap + 8
1 libdispatch.dylib 0x3af83208 _dispatch_semaphore_wait_slow + 120
2 libdispatch.dylib 0x3af8299e _dispatch_worker_thread + 110
3 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
4 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
5 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 13:
0 libsystem_kernel.dylib 0x3b043ac0 semaphore_timedwait_trap + 8
1 libdispatch.dylib 0x3af83208 _dispatch_semaphore_wait_slow + 120
2 libdispatch.dylib 0x3af8299e _dispatch_worker_thread + 110
3 libsystem_pthread.dylib 0x3b0bf916 _pthread_body + 138
4 libsystem_pthread.dylib 0x3b0bf886 _pthread_start + 98
5 libsystem_pthread.dylib 0x3b0bdaa0 thread_start + 4
Thread 14:
0 libsystem_kernel.dylib 0x3b043aa8 semaphore_wait_trap + 8
1 libsystem_platform.dylib 0x3b0b8ba8 _os_semaphore_wait + 8
2 libdispatch.dylib 0x3af81616 _dispatch_barrier_sync_f_slow + 134
3 backboardd 0x00073d64 0x43000 + 200036
4 libxpc.dylib 0x3b0cd382 _xpc_connection_call_event_handler + 38
5 libxpc.dylib 0x3b0cb82a _xpc_connection_mach_event + 1550
6 libdispatch.dylib 0x3af85c4a _dispatch_mach_msg_invoke$VARIANT$mp + 114
7 libdispatch.dylib 0x3af81ec2 _dispatch_queue_drain$VARIANT$mp + 410
8 libdispatch.dylib 0x3af85eb2 _dispatch_mach_invoke$VARIANT$mp + 74
9 libdispatch.dylib 0x3af81ec2 _dispatch_queue_drain$VARIANT$mp + 410
10 libdispatch.dylib 0x3af81c92 _dispatch_queue_invoke$VARIANT$mp + 38
11 libdispatch.dylib 0x3af82a42 _dispatch_root_queue_drain + 74
12 libdispatch.dylib 0x3af82d24 _dispatch_worker_thread2 + 52
13 libsystem_pthread.dylib 0x3b0bdbd0 _pthread_wqthread + 296
14 libsystem_pthread.dylib 0x3b0bda94 start_wqthread + 4
Thread 15 Crashed:
0 libsystem_platform.dylib 0x3b0bc4d4 DYLD-STUB$$MKGetTimeBaseInfo + 0
1 libsystem_malloc.dylib 0x3b07c952 malloc_zone_malloc + 70
2 CoreFoundation 0x2fce768a _CFRuntimeCreateInstance + 218
3 CoreFoundation 0x2fcfb2e2 CFStringCreateMutable + 54
4 CoreFoundation 0x2fd0f01e CFStringCreateMutableCopy + 106
5 Foundation 0x306ff372 -[NSPlaceholderMutableString initWithString:] + 186
6 Foundation 0x306ff3ba +[NSString stringWithString:] + 38
7 backboardd 0x00044e8e 0x43000 + 7822
8 CoreFoundation 0x2fd31528 -[NSSet descriptionWithLocale:indent:] + 344
9 Foundation 0x306d61c0 _NSDescriptionWithLocaleFunc + 64
10 CoreFoundation 0x2fd8eed8 __CFStringAppendFormatCore + 5656
11 CoreFoundation 0x2fcfe60c _CFStringCreateWithFormatAndArgumentsAux + 72
12 Foundation 0x306d615e -[NSPlaceholderString initWithFormat:locale:arguments:] + 126
13 Foundation 0x306d6064 +[NSString stringWithFormat:] + 56
14 backboardd 0x0006285e 0x43000 + 129118
15 backboardd 0x00069e6a 0x43000 + 159338
16 backboardd 0x00069dca 0x43000 + 159178
17 libxpc.dylib 0x3b0cd382 _xpc_connection_call_event_handler + 38
18 libxpc.dylib 0x3b0cb5e4 _xpc_connection_mach_event + 968
19 libdispatch.dylib 0x3af86a5e _dispatch_mach_cancel_invoke + 34
20 libdispatch.dylib 0x3af85fd4 _dispatch_mach_invoke$VARIANT$mp + 364
21 libdispatch.dylib 0x3af81ec2 _dispatch_queue_drain$VARIANT$mp + 410
22 libdispatch.dylib 0x3af81c92 _dispatch_queue_invoke$VARIANT$mp + 38
23 libdispatch.dylib 0x3af81ec2 _dispatch_queue_drain$VARIANT$mp + 410
24 libdispatch.dylib 0x3af81c92 _dispatch_queue_invoke$VARIANT$mp + 38
25 libdispatch.dylib 0x3af82a42 _dispatch_root_queue_drain + 74
26 libdispatch.dylib 0x3af82d24 _dispatch_worker_thread2 + 52
27 libsystem_pthread.dylib 0x3b0bdbd0 _pthread_wqthread + 296
28 libsystem_pthread.dylib 0x3b0bda94 start_wqthread + 4
Thread 16:
0 libsystem_kernel.dylib 0x3b056c70 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3b0bdbda _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3b0bda94 start_wqthread + 4
Thread 17:
0 libsystem_kernel.dylib 0x3b056c70 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3b0bdbda _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3b0bda94 start_wqthread + 4
Thread 15 crashed with ARM Thread State (32-bit):
r0: 0x000b6500 r1: 0x3b0bc4d4 r2: 0x00000000 r3: 0x2fd63899
r4: 0x00000000 r5: 0x000b6500 r6: 0x00000020 r7: 0x03a87894
r8: 0x000b3000 r9: 0x172fb0f0 r10: 0x000b6500 r11: 0x00000007
ip: 0x3d04c118 sp: 0x03a87808 lr: 0x3b07c9c5 pc: 0x3b0bc4d4
cpsr: 0x80000010
Bad magic 0x2FCECEBF
Microstackshots: 1 (from 2147483647-10-02 17:00:00 -0800 to 2147483647-10-02 17:00:00 -0800)
1 ??? [0x27dbd028]
1 CoreFoundation 0x2fce5000 + 649291 [0x2fd8384b]
1 ??? [0x27dbcfec]
1 libsystem_kernel.dylib 0x3b043000 + 2137 [0x3b043859]
1 ??? [0x27dbcfac]
1 libsystem_kernel.dylib 0x3b043000 + 2648 [0x3b043a58]
*1 ??? [0x800af745]