MonoTouch：RequestReverseGeocode崩潰

Question

我有一個簡單的類，它反向地理編碼，但它會導致應用崩潰（SIGSEGV），有時（50％）但不一致。

我已經嘗試在UI線程和後臺線程以及ViewController的生命週期的不同部分運行它，但它似乎是隨機的。沒有太多的應用程序正在發生的事情，當它啓動時，大多隻是通過MonoTouch.Dialog構建UI

MKReverseGeocoder coder; 
    MyMKReverseGeocoderDelegate myMKReverseGeocoderDelegate; 
    public void RequestReverseGeocode (CLLocationCoordinate2D coordinate, Action<MKPlacemark> callback) 
    { 
     myMKReverseGeocoderDelegate= new MyMKReverseGeocoderDelegate (callback); 
     coder = new MKReverseGeocoder (coordinate); 
     coder.Delegate = myMKReverseGeocoderDelegate; 
     coder.Start(); 
    } 

    internal class MyCLRequestLocationManagerDelegate : CLLocationManagerDelegate 
    { 
     Action<CLLocation> callback; 

     public MyCLRequestLocationManagerDelegate (Action<CLLocation> callback) 
     { 
      this.callback = callback; 
     } 

     public override void UpdatedLocation (CLLocationManager manager, CLLocation newLocation, CLLocation oldLocation) 
     { 
      manager.StopUpdatingLocation(); 
      locationManager = null; 
      callback (newLocation); 
     } 

     public override void Failed (CLLocationManager manager, NSError error) 
     { 
      callback (null); 
     } 
    } 

崩潰，詳情請看這裏：

at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain 
(int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff> 
    at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x00042] in 
/Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:29 
    at MonoTouch.UIKit.UIApplication.Main (string[]) [0x00000] in 
/Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:34 
    at AlternativeFuelingStationLocator.Application.Main (string[]) [0x00000] in 
/Users/vink/Dropbox/Dev/iOS/UNIVERSAL/DOE/AlternativeFuelingStationLocator/AlternativeFuelingStationLocator/Main.cs:16 
    at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object 
(object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff> 

Native stacktrace: 

    0 AlternativeFuelingStationLocator 0x000e1018 
mono_handle_native_sigsegv + 408 
    1 AlternativeFuelingStationLocator 0x00011d9f 
mono_sigsegv_signal_handler + 351 
    2 libsystem_c.dylib     0x9ad7759b _sigtramp + 43 
    3 ???         0xffffffff 0x0 + 4294967295 
    4 MapKit        0x01e3b4cf MKMapRectRemainder + 
101422 
    5 GeoServices       0x0617f3b8 GEOTileKeyContainsKey + 
166198 
    6 GMM         0x092a3f3d 
GEOTileKeyFromGMMTilePath + 31777 
    7 ProtocolBuffer      0x061dfcf1 ProtocolBuffer + 19697 
    8 Foundation       0x0192aa59 
___NSURLConnectionDidFinishLoading_block_invoke_0 + 40 
    9 Foundation       0x01928e94 
__65-[NSURLConnectionInternal 
_withConnectionAndDelegate:onlyActive:]_block_invoke_0 + 40 
    10 Foundation       0x01929eb7 
-[NSURLConnectionInternalConnection invokeForDelegate:] + 39 
    11 Foundation       0x01928e4f 
-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 201 
    12 Foundation       0x01928fd5 
-[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 76 
    13 Foundation       0x0186df6a 
_NSURLConnectionDidFinishLoading + 43 
    14 CFNetwork       0x00c68bbd 
_ZN19URLConnectionClient23_clientDidFinishLoadingEPNS_26ClientConnectionEventQueueE 
+ 241 
    15 CFNetwork       0x00d355ea 
_ZN19URLConnectionClient26ClientConnectionEventQueue33processAllEventsAndConsumePayloadEP20XConnectionEventInfoI12XClientEvent18XClientEventParamsEl 
+ 584 
    16 CFNetwork       0x00c5f298 
_ZN19URLConnectionClient13processEventsEv + 174 
    17 CFNetwork       0x00d3516b 
_ZThn52_N25URLConnectionInstanceData24multiplexerClientPerformEv + 21 
    18 CFNetwork       0x00c5f137 
_ZN17MultiplexerSource7performEv + 259 
    19 CoreFoundation      0x012ab97f 
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15 
    20 CoreFoundation      0x0120eb73 __CFRunLoopDoSources0 + 
243 
    21 CoreFoundation      0x0120e454 __CFRunLoopRun + 1012 
    22 CoreFoundation      0x0120ddb4 CFRunLoopRunSpecific + 
212 
    23 CoreFoundation      0x0120dccb CFRunLoopRunInMode + 123 
    24 GraphicsServices     0x0489f879 GSEventRunModal + 207 
    25 GraphicsServices     0x0489f93e GSEventRun + 114 
    26 UIKit        0x022a6a9b UIApplicationMain + 1175 
    27 ???         0x0e0b6fcd 0x0 + 235630541 
    28 ???         0x0e0b6c18 0x0 + 235629592 
    29 ???         0x0e0b6184 0x0 + 235626884 
    30 ???         0x0e0b5fdc 0x0 + 235626460 
    31 ???         0x0e0b612e 0x0 + 235626798 
    32 AlternativeFuelingStationLocator 0x00011aef mono_jit_runtime_invoke 
+ 1407 
    33 AlternativeFuelingStationLocator 0x0022011a mono_runtime_invoke + 
170 
    34 AlternativeFuelingStationLocator 0x00222e51 mono_runtime_exec_main + 
705 
    35 AlternativeFuelingStationLocator 0x00222061 mono_runtime_run_main + 
929 
    36 AlternativeFuelingStationLocator 0x000ad6df mono_jit_exec + 239 
    37 AlternativeFuelingStationLocator 0x002f41ca main + 5194 
    38 AlternativeFuelingStationLocator 0x00003345 start + 53 


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. 

Answer 1

它看起來像一個GC問題（垃圾收集）。

當我把所有涉及的對象，並使他們的類變量問題消失。