title: how to debug EXC_CRASH (SIGTRAP)
body: <p>i'm running my app are running fine until i resume from background or with out location services, the app will crash.</p>
  
  <p>the crash log shows Exception Type:  EXC_CRASH (SIGTRAP)</p>
  
  <p>Anybody know how to debug it ?</p>
  
  <pre><code>Exception Type:  EXC_CRASH (SIGTRAP)
  Exception Codes: 0x00000000, 0x00000000
  Crashed Thread:  0
  
  Thread 0 name:  Dispatch queue: com.apple.main-thread
  Thread 0 Crashed:
  0   libsystem_kernel.dylib          0x36398848 __kill + 8
  1   FrogFinder                      0x000b5034 0x69000 + 311348
  2   CoreFoundation                  0x3447e980 __handleUncaughtException + 68
  3   libobjc.A.dylib                 0x346ce2ca _objc_terminate + 122
  4   libc++abi.dylib                 0x338a33be _ZL19safe_handler_callerPFvvE + 70
  5   libc++abi.dylib                 0x338a344a std::terminate() + 14
  6   libc++abi.dylib                 0x338a481e __cxa_rethrow + 82
  7   libobjc.A.dylib                 0x346ce22e objc_exception_rethrow + 6
  8   CoreFoundation                  0x343d453e CFRunLoopRunSpecific + 398
  9   CoreFoundation                  0x343d439e CFRunLoopRunInMode + 98
  10  GraphicsServices                0x30c58fc6 GSEventRunModal + 150
  11  UIKit                           0x3785573c UIApplicationMain + 1084
  12  FrogFinder                      0x0006a7e6 0x69000 + 6118
  13  FrogFinder                      0x0006a7a4 0x69000 + 6052
  
  Thread 1 name:  Dispatch queue: com.apple.libdispatch-manager
  Thread 1:
  0   libsystem_kernel.dylib          0x363893b4 kevent + 24
  1   libdispatch.dylib               0x370b3e78 _dispatch_mgr_invoke + 708
  2   libdispatch.dylib               0x370b3b96 _dispatch_mgr_thread + 30
  
  Thread 2 name:  WebThread
  Thread 2:
  0   libsystem_kernel.dylib          0x36389010 mach_msg_trap + 20
  1   libsystem_kernel.dylib          0x36389206 mach_msg + 50
  2   CoreFoundation                  0x3445241c __CFRunLoopServiceMachPort + 120
  3   CoreFoundation                  0x34451154 __CFRunLoopRun + 876
  4   CoreFoundation                  0x343d44d6 CFRunLoopRunSpecific + 294
  5   CoreFoundation                  0x343d439e CFRunLoopRunInMode + 98
  6   WebCore                         0x368a8128 _ZL12RunWebThreadPv + 396
  7   libsystem_c.dylib               0x33224c16 _pthread_start + 314
  8   libsystem_c.dylib               0x33224ad0 thread_start + 0
  
  Thread 3 name:  com.apple.NSURLConnectionLoader
  Thread 3:
  0   libsystem_kernel.dylib          0x36389010 mach_msg_trap + 20
  1   libsystem_kernel.dylib          0x36389206 mach_msg + 50
  2   CoreFoundation                  0x3445241c __CFRunLoopServiceMachPort + 120
  3   CoreFoundation                  0x34451154 __CFRunLoopRun + 876
  4   CoreFoundation                  0x343d44d6 CFRunLoopRunSpecific + 294
  5   CoreFoundation                  0x343d439e CFRunLoopRunInMode + 98
  6   Foundation                      0x35dd4bc2 +[NSURLConnection(Loader) _resourceLoadLoop:] + 302
  7   Foundation                      0x35dd4a8a -[NSThread main] + 66
  8   Foundation                      0x35e6859a __NSThread__main__ + 1042
  9   libsystem_c.dylib               0x33224c16 _pthread_start + 314
  10  libsystem_c.dylib               0x33224ad0 thread_start + 0
  
  Thread 4:
  0   libsystem_kernel.dylib          0x36389010 mach_msg_trap + 20
  1   libsystem_kernel.dylib          0x36389206 mach_msg + 50
  2   CoreFoundation                  0x3445241c __CFRunLoopServiceMachPort + 120
  3   CoreFoundation                  0x34451154 __CFRunLoopRun + 876
  4   CoreFoundation                  0x343d44d6 CFRunLoopRunSpecific + 294
  5   CoreFoundation                  0x343d439e CFRunLoopRunInMode + 98
  6   Foundation                      0x35dc8b7e -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 250
  7   Foundation                      0x35de252c -[NSRunLoop(NSRunLoop) run] + 72
  8   FrogFinder                      0x000c8da6 0x69000 + 392614
  9   Foundation                      0x35dd4a8a -[NSThread main] + 66
  10  Foundation                      0x35e6859a __NSThread__main__ + 1042
  11  libsystem_c.dylib               0x33224c16 _pthread_start + 314
  12  libsystem_c.dylib               0x33224ad0 thread_start + 0
  
  Thread 5 name:  NetworkIO
  Thread 5:
  0   libsystem_kernel.dylib          0x36389010 mach_msg_trap + 20
  1   libsystem_kernel.dylib          0x36389206 mach_msg + 50
  2   CoreFoundation                  0x3445241c __CFRunLoopServiceMachPort + 120
  3   CoreFoundation                  0x34451154 __CFRunLoopRun + 876
  4   CoreFoundation                  0x343d44d6 CFRunLoopRunSpecific + 294
  5   CoreFoundation                  0x343d439e CFRunLoopRunInMode + 98
  6   MapKit                          0x38030412 0x38022000 + 58386
  7   Foundation                      0x35dd4a8a -[NSThread main] + 66
  8   Foundation                      0x35e6859a __NSThread__main__ + 1042
  9   libsystem_c.dylib               0x33224c16 _pthread_start + 314
  10  libsystem_c.dylib               0x33224ad0 thread_start + 0
  </code></pre>