解决dnu restore时的“Cannot handle address family”问题

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前几天在使用基于 mono 的 dnx 中的 dnu restore 命令安装 nuget 包包时，遇到了 “Cannot handle address family” 错误，错误详情如下：

Cannot handle address family 61712

Stacktrace:

  at <unknown> <0xffffffff>

  at (wrapper managed-to-native) System.Net.Dns.GetHostByName_internal (string,string&,string[]&,string[]&) <0xffffffff>

  at System.Net.Dns.GetHostByName (string) <0x00054>

  at System.Net.ServicePoint.get_HostEntry () <0x00219>

  at System.Net.WebConnection.Connect (System.Net.HttpWebRequest) <0x001d4>

  at System.Net.WebConnection.InitConnection (object) <0x002ea>

  at System.Net.WebConnection.<WebConnection>m__0 (object) <0x00024>

  at System.Runtime.Remoting.Messaging.AsyncResult.WaitCallback_Context (object) <0x00058>

  at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) <0x001c6>

  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) <0x00020>

  at System.Runtime.Remoting.Messaging.AsyncResult.<AsyncResult>m__0 (object) <0x00022>

  at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___object (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

	mono() [0x4a1ce8]

	/lib/x86_64-linux-gnu/libpthread.so.0(+0x10340) [0x7f96c8e7e340]

	/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x39) [0x7f96c8adfcc9]

	/lib/x86_64-linux-gnu/libc.so.6(abort+0x148) [0x7f96c8ae30d8]

	mono() [0x6318c6]

	mono() [0x6316b3]

	mono() [0x631769]

	mono() [0x62b0b5]

	mono() [0x57a5e6]

	[0x40bb793e]

Debug info from gdb:

=================================================================

Got a SIGABRT while executing native code. This usually indicates

a fatal error in the mono runtime or one of the native libraries

used by your application.

=================================================================

在 github 上提交 issue 之后，从回复中得知这是 mono 的一个 bug，有人已经向 mono 提交了这个 bug ，详见 Use "Dns.GetHostEntry" or "Dns.GetHostByName",sometime throw error "Cannot handle address family xxxxx" 。

当时错误一直存在，怎么也无法完成 dnu restore 。后来，过了一段时间再操作，突然就好了。

后来，遇到了好几次这个问题，都是出现错误后，过一段时间就好了。

今天再次遇到，突然想到，是不是 dns 缓存的原因，清一下 dns 缓存试试。