title: Xamarin iOS iPad App is crashing, unexplained
body: <p>we are creating a large iOS App with Xamarin.
  Since a few days, we have the problem that the app is crashing in absolutely unexpected ways. We don't get a log from the Xamarin debugger, it is completly empty. Only the stop button switches to play ;) 
  The only thing we have is the attached XCode Console Log. But for me it is not possible to find out what has happened.</p>
  
  <p>The problem is not reproduceable and it happens in different places of the app.
  Did somebody saw a similiar problem and found out a solution for this?</p>
  
  <pre><code>Mar 21 15:01:15  Ios[312] &lt;Error&gt;: Stacktrace:
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:   at &lt;unknown&gt; &lt;0xffffffff&gt;
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:   at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) &lt;0xffffffff&gt;
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:   at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/.pmcs-compat.UIApplication.cs:38
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:   at Ios.Application.Main (string[]) [0x00008] in /Users/admin/Projects/XXX/Source/Ios/Main.cs:15
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:   at (wrapper runtime-invoke) object.runtime_invoke_dynamic (intptr,intptr,intptr,intptr) &lt;0xffffffff&gt;
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;: 
      Native stacktrace:
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  0   Ios                                 0x00cfdb69 mono_handle_native_sigsegv + 260
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  1   Ios                                 0x00d06d09 mono_sigsegv_signal_handler + 176
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  2   libsystem_platform.dylib            0x38b18063 _sigtramp + 42
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  3   UIKit                               0x307b8cf5 &lt;redacted&gt; + 76
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  4   CoreFoundation                      0x2de27504 &lt;redacted&gt; + 68
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  5   CoreFoundation                      0x2dd71dfb &lt;redacted&gt; + 282
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  6   CoreFoundation                      0x2dd75593 &lt;redacted&gt; + 50
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  7   WebKit                              0x368b2ee7 &lt;redacted&gt; + 222
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  8   CoreFoundation                      0x2de26069 &lt;redacted&gt; + 352
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  9   CoreFoundation                      0x2dd754d8 _CF_forwarding_prep_0 + 24
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  10  CoreFoundation                      0x2de27504 &lt;redacted&gt; + 68
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  11  CoreFoundation                      0x2dd71dfb &lt;redacted&gt; + 282
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  12  WebCore                             0x35f101bd &lt;redacted&gt; + 100
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  13  CoreFoundation                      0x2ddef183 &lt;redacted&gt; + 14
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  14  CoreFoundation                      0x2ddee653 &lt;redacted&gt; + 206
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  15  CoreFoundation                      0x2ddece47 &lt;redacted&gt; + 622
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  16  CoreFoundation                      0x2dd57c27 CFRunLoopRunSpecific + 522
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  17  CoreFoundation                      0x2dd57a0b CFRunLoopRunInMode + 106
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  18  GraphicsServices                    0x32a2b283 GSEventRunModal + 138
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  19  UIKit                               0x305fb049 UIApplicationMain + 1136
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  20  Ios                                 0x004ac450 wrapper_managed_to_native_MonoTouch_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr + 272
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  21  Ios                                 0x0046335c MonoTouch_UIKit_UIApplication_Main_string___string_string + 300
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  22  Ios                                 0x0000bcc8 Ios_Application_Main_string__ + 172
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  23  Ios                                 0x0064c558 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 200
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  24  Ios                                 0x00d08e25 mono_jit_runtime_invoke + 1196
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  25  Ios                                 0x00d46e8d mono_runtime_invoke + 88
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  26  Ios                                 0x00d4aa67 mono_runtime_exec_main + 282
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  27  Ios                                 0x00d4a8a7 mono_runtime_run_main + 474
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  28  Ios                                 0x00cf710d mono_jit_exec + 48
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  29  Ios                                 0x00d97fe8 main + 2464
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;:  30  Ios                                 0x0000b028 start + 40
  Mar 21 15:01:15  Ios[312] &lt;Error&gt;: 
      =================================================================
      Got a SIGSEGV while executing native code. This usually indicates
      a fatal error in the mono runtime or one of the native libraries 
      used by your application.
      =================================================================
  </code></pre>