然而,当我尝试在OSX Yosemite 10.10.2(也许是其他人)上运行它时,应用程序以一种光荣的方式失败.我已经隔离了一些对Newtonsoft JSON.NET的调用,并在一个独立的沙盒应用程序中运行它们,并且永远无法重现这个问题.我已粘贴下面的调试信息,希望有人看到堆栈跟踪中的某些内容或其他可能指向明显问题的内容.

Stacktrace:

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) object.__icall_wrapper_mono_gc_alloc_vector (intptr,intptr,intptr) <0xffffffff>
  at (wrapper alloc) object.AllocVector (intptr,intptr) <0xffffffff>
  at System.Reflection.Emit.DynamicMethod.AddRef (object) <0x00077>
  at System.Reflection.Emit.DynamicMethodTokenGenerator.GetToken (System.Reflection.MemberInfo,bool) <0x0001b>
  at System.Reflection.Emit.ILGenerator.Emit (System.Reflection.Emit.OpCode,System.Type) <0x000ee>
  at Newtonsoft.Json.Utilities.ILGeneratorExtensions.BoxIfNeeded (System.Reflection.Emit.ILGenerator,System.Type) <0x0007a>
  at Newtonsoft.Json.Utilities.DynamicReflectionDelegateFactory.GenerateCreateGetPropertyIL (System.Reflection.PropertyInfo,System.Reflection.Emit.ILGenerator) <0x0009b>
  at Newtonsoft.Json.Utilities.DynamicReflectionDelegateFactory.CreateGet<T> (System.Reflection.PropertyInfo) <0x000bf>
  at Newtonsoft.Json.Utilities.ReflectionDelegateFactory.CreateGet<T> (System.Reflection.MemberInfo) <0x0007d>
  at Newtonsoft.Json.Serialization.DynamicValueProvider.GetValue (object) <0x0003f>
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues (Newtonsoft.Json.JsonWriter,object,Newtonsoft.Json.Serialization.JsonContainerContract,Newtonsoft.Json.Serialization.JsonProperty,Newtonsoft.Json.Serialization.JsonContract&,object&) <0x000fe>
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject (Newtonsoft.Json.JsonWriter,Newtonsoft.Json.Serialization.JsonObjectContract,Newtonsoft.Json.Serialization.JsonProperty) <0x00197>
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue (Newtonsoft.Json.JsonWriter,Newtonsoft.Json.Serialization.JsonContract,Newtonsoft.Json.Serialization.JsonProperty) <0x0015f>
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize (Newtonsoft.Json.JsonWriter,System.Type) <0x000bf>
  at Newtonsoft.Json.JsonSerializer.SerializeInternal (Newtonsoft.Json.JsonWriter,System.Type) <0x0053b>
  at Newtonsoft.Json.JsonSerializer.Serialize (Newtonsoft.Json.JsonWriter,System.Type) <0x00019>
  at Newtonsoft.Json.JsonConvert.SerializeObjectInternal (object,System.Type,Newtonsoft.Json.JsonSerializer) <0x000e7>
  at Newtonsoft.Json.JsonConvert.SerializeObject (object,Newtonsoft.Json.Formatting,Newtonsoft.Json.JsonSerializerSettings) <0x0003f>
  at Newtonsoft.Json.JsonConvert.SerializeObject (object,Newtonsoft.Json.JsonSerializerSettings) <0x00017>
  at kvpbase.kvpserver.serialize_json (object) <0x000e7>
  at kvpbase.kvpserver.obj_write (System.Net.HttpListenerContext,kvpbase.request_Metadata,kvpbase.obj) <0x01bd7>
  at kvpbase.kvpserver.put_handler (System.Net.HttpListenerContext,kvpbase.request_Metadata) <0x00f4f>
  at kvpbase.kvpserver.user_api (System.Net.HttpListenerContext,kvpbase.request_Metadata) <0x0062f>
  at kvpbase.kvpserver.processor (System.Net.HttpListenerContext,kvpbase.http_request) <0x0103b>
  at kvpbase.kvpserver.conn_handler (System.IAsyncResult) <0x005a7>
  at System.Net.ListenerAsyncResult.InvokeCallback (object) <0x00051>
  at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___object (object,intptr) <0xffffffff>

Native stacktrace:


Debug info from gdb:

(lldb) command source -s 0 '/tmp/mono-gdb-commands.1s6ayI'
Executing commands in '/private/tmp/mono-gdb-commands.1s6ayI'.
(lldb) process attach --pid 4136
Process 4136 stopped
Executable module set to "/usr/bin/mono".
Architecture set to: i386-apple-macosx.
(lldb) thread list
Process 4136 stopped

为简洁起见,我删除了一堆与线程相关的数据.全文可以在这里看到：https://gist.github.com/jchristn/677c53abc3c3028d804f

serialize_json方法如下(非常简单)：

public static string serialize_json(object obj)
{
  return JsonConvert.SerializeObject(obj,Newtonsoft.Json.Formatting.Indented,new JsonSerializerSettings { });
}

和单声道版本：

sh-3.2# mono --version
Mono JIT compiler version 3.10.0 ((detached/e204655 Mon Oct 13 08:50:28 EDT 2014)
Copyright (C) 2002-2014 Novell,Inc,Xamarin Inc and Contributors. www.mono-project.com
    TLS:           normal
    SIGSEGV:       altstack
    Notification:  kqueue
    Architecture:  x86
    Disabled:      none
    Misc:          softdebug 
    LLVM:          yes(3.4svn-mono-(detached/e656cac)
    GC:            sgen

有问题的JSON字符串如下所示：

{
  "url": "http://localhost/root/home/foo","user_guid": "root","container_name": "home","size": 3259,"num_objects": 1,"container_path": [],"child_containers": [
    "abcd","foo","large-dir"
  ],"obj_Metadata": [
    {
      "key": "foo","created": "2014-10-24T07:44:24.5773422Z","last_update": "2014-10-24T07:44:24.5773422Z","last_access": "2014-10-24T07:44:24.5773422Z"
    }
  ]
}

它的定义是：

public class dir_info
{
    public string url { get; set; }
    public string user_guid { get; set; }
    public string container_name { get; set; }
    public long size { get; set; }
    public int num_objects { get; set; }
    public List<string> container_path { get; set; }
    public List<string> child_containers { get; set; }
    public List<obj_info> obj_Metadata { get; set; }
}

这是在较旧的Macbook Pro上,但它有一个Core 2 Duo和8GB的RAM.机器上没有其他任何东西在运行.

还尝试将Mono更新为3.12.1,它也有同样的问题.

sh-3.2# which mono
/usr/bin/mono
sh-3.2# mono --version
Mono JIT compiler version 3.12.1 ((detached/b7764aa Fri Mar  6 15:32:47 EST 2015)
Copyright (C) 2002-2014 Novell,Xamarin Inc and Contributors. www.mono-project.com
    TLS:           normal
    SIGSEGV:       altstack
    Notification:  kqueue
    Architecture:  x86
    Disabled:      none
    Misc:          softdebug 
    LLVM:          yes(3.6.0svn-mono-(detached/5486eb2)
    GC:            sgen

我也试过在Windows上运行Mono,但问题没有出现(v3.12.1).