signal11(SIGSEGV) at 0x00000000(code=1)

产品基于cocos2dx开发游戏。 

出现的问题：如果app游戏时正好网络处于开启状态，则运行正常。反之，则在android logcat输出signal11(SIGSEGV) at 0x00000000(code=1) 

 12-06 14:59:22.482: I/dalvikvm(8782): dvmDdmHandleHpsgChunk(when 0, what 0, heap 0)
 12-06 14:59:23.376: I/dalvikvm(8782): Debugger is active
 12-06 14:59:44.266: D/Cocos2dxActivity(8782): model=HUAWEI U9510E
 12-06 14:59:44.266: D/Cocos2dxActivity(8782): product=U9510E
 12-06 14:59:44.266: D/Cocos2dxActivity(8782): isEmulator=false
 12-06 14:59:45.873: W/System.err(8782): /data/system/carrierinfo.prop: open failed: ENOENT (No such file or directory)
 12-06 14:59:45.879: W/System.err(8782): java.net.UnknownHostException: Unable to resolve host "feedback.umeng.com": No address associated with hostname
 12-06 14:59:45.886: W/System.err(8782):     at java.net.InetAddress.lookupHostByName(InetAddress.java:426)
 12-06 14:59:45.889: W/System.err(8782):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
 12-06 14:59:45.893: W/System.err(8782):     at java.net.InetAddress.getAllByName(InetAddress.java:220)
 12-06 14:59:45.899: W/System.err(8782):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
 12-06 14:59:45.903: W/System.err(8782):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
 12-06 14:59:45.903: W/System.err(8782):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
 12-06 14:59:45.913: W/System.err(8782):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
 12-06 14:59:45.916: W/System.err(8782):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
 12-06 14:59:45.923: W/System.err(8782):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
 12-06 14:59:45.929: W/System.err(8782):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
 12-06 14:59:45.939: W/System.err(8782):     at com.umeng.fb.a.b.a(FbClient.java:189)
 12-06 14:59:45.943: W/System.err(8782):     at com.umeng.fb.model.Conversation$1.run(Conversation.java:219)/data/system/carrierinfo.prop: open failed: ENOENT (No such file or directory)
 12-06 14:59:45.946: W/System.err(8782):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
 12-06 14:59:45.946: W/System.err(8782):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
 12-06 14:59:45.946: W/System.err(8782):     at java.lang.Thread.run(Thread.java:856)
 12-06 14:59:45.949: W/System.err(8782): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
 12-06 14:59:45.966: W/System.err(8782):     at libcore.io.Posix.getaddrinfo(Native Method)
 12-06 14:59:45.966: W/System.err(8782):     at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:56)
 12-06 14:59:45.969: W/System.err(8782):     at java.net.InetAddress.lookupHostByName(InetAddress.java:411)
 12-06 14:59:45.969: W/System.err(8782):     ... 14 more
 12-06 14:59:45.976: W/System.err(8782): /data/system/carrierinfo.prop: open failed: ENOENT (No such file or directory)
 12-06 14:59:47.446: A/libc(8782): Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1)

完整的排错过程如下 
1, android debug模式查看具体出错的问题 
   貌似不是在android层, 确定为cpp代码出了问题； 

2. appdelegate.cpp 
   CCLog("test") 
   没有打印出来，仍然直接报错 

3.  继续log输出 
     System.loadLibrary("game"); 
  Log.i(TAG,"android loadLibary done"); 
  logcat能够输出相关代码，说明android层的代码都执行了，现在代码运行到了cpp层； 

4. 继续跟踪jni/game/main.cpp 
      Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeInit 
   printf("test") 
   log cat没有显示print信息 
       这里一直对cocos2dx在android输出存在疑问。后来在application.mk添加了相关的设置仍然看不到log输出。 

5. 采用 
      coco2d:cclog("test") 
     情况依旧 

6.  开始排除jpush第三方推送jar, so库是否存在问题。 
    删除libs/libsys.so (jpush的so文件) 
    删除jpushInterface.init(this) 

7. 继续在jni/game/main.cpp 
    使用ccmessagebox(); 
    没有显示弹出窗口提示； 

8. 修改application.mk 
    LOCAL_CFLAGS += -DCOCOS2D_DEBUG=2 
   没有结果，问题仍然存在 
   
9.  libegl  loaded /system/lib.egl/libegl_viviante.so, 
    如果关闭网络，则没有显示加载上述的so文件 
        

10. 打开jpush.setDebug(true); 
    在无网络情况下，显示sis error 

11. 使用ndk-stack来查找崩溃 
       ./adb logcat|ndk-stack -sym /Users/chenxu/work/c++/cocos2d-x-2.1.4/work/doudizhu/proj.android/obj/local/armeabi/      
      

        ********** Crash dump: **********
 Build fingerprint: 'Huawei/U9510E/hwu9510e:4.0.4/HuaweiU9510E/CHNC00B122:user/ota-rel-keys,release-keys'
 pid: 27322, tid: 27322  >>> com.nbgame.doudizhu <<<
 signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000
 Stack frame #00  pc 003b8158  /data/data/com.nbgame.doudizhu/lib/libgame.so (_ZN12GameProtocal19createServerMessageEi): Routine createServerMessage in /Users/chenxu/work/c++/cocos2d-x-2.1.4/work/doudizhu/proj.android/../../../baisonext/NetWork/GameProtocal.cpp:46
 Stack frame #01  pc 003b7dcc  /data/data/com.nbgame.doudizhu/lib/libgame.so (_ZN7Network20dispatchNetworkErrorEi): Routine dispatchNetworkError in /Users/chenxu/work/c++/cocos2d-x-2.1.4/work/doudizhu/proj.android/../../../baisonext/NetWork/Network.cpp:319

真正崩溃原因，这次是冤枉了jpush等第三方库，是android工程编写有问题。 
原因是android启动后立即监控网络状态，如果网络为断开状态，则通过jni call cpp, 后者调用dispatchNetwork()函数，通过创建一个message丢入队列，界面线程pop消息之后，画出网络错误提示界面提示。 
     
      问题在于：这些都是多线程处理的，即android层由独立线程监控网络状态, cocos2dx界面层由独立线程运行，其中后者在收到网络错误时候，需要有关的未初始化实例来创建消息，导致了空指针的错误。 fatal signal 11(SIGSEGV) 

      最后解决办法：只有确定网络ok, 并且用户成功登陆后，cpp层采取调用原生android层，去监听网络状态。这样可以避免前面网络未建立就立刻通知界面的错误；
           
      ndk-stack是个好东西，对于android异常崩溃能够提供call-stack，有效确定代码的出错位置； 

来自：http://nbtlxx.iteye.com/blog/1986197