使用EXC_资源关闭应用程序，iOS 7上出现CPU异常

应用程序在后台运行，与可编程设备通信。它在我们的测试中运行良好，但现在我们遇到了崩溃。 崩溃报告显示了以下详细信息，这里是线程15上发生的崩溃

它与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]

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看起来你的应用程序使用了太多的CPU，所以iOS停止了它。