【翻译 windbg - 6】NET 调试示例实验 1：挂起

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NET 调试示例实验 1：挂起

原文	http://blogs.msdn.com/tess/archive/2008/02/04/net-debugging-demos-lab-1-hang.aspx
作者	tess
翻译	AloneSword
译文	http://blog.csdn.net/alonesword/

NET 调试实验室 1 ：挂起

这是关于NET 调试实验的10个当中一个。实验中将使用BuggyBits作为站点名称，而且实验名称建议采用 Buggy。

安装信息可以在此处获取。

可以预测：这些动手实验室当中会有很多问题，虽然我会尽量回答在评论中提到的问题，但是不能保证是所有的内容。如果您能回答评论中的问题，请不要吝啬您的答案。提问题前，请确保已执行过安装指南中所有步骤。

注意： 实验室中提问（Q：）仅仅是一个问题解决的目标。我会实验复习课程中，编辑评论中关于此问题的答案（每个实验大概会有一周左右的思考时间，这期间是没有答案的）。

自由的评论实验的格式好坏，以便我能在下次实验内容中知道什么做的好，什么不应该继续。

将来无约定，这儿就是实验 1：

现象重复

<!--[if !supportLists]-->1、 <!--[endif]-->浏览页面： http://localhost/BuggyBits/FeaturedProducts.aspx
这个页面大概需要5秒左右时间才能显示，可在页面底端的看到页面开始时间和执行时间。

<!--[if !supportLists]-->2、 <!--[endif]-->同时打开5个浏览器窗口，浏览上述网页
注意尽量做到同时打开这些网页（否则可能是没有执行reg文件）

Q: 什么是执行时间？

Q: 什么是 w3wp.exe 的CPU使用率？高低标准？

Q: 系统挂起的潜在原因？

获取内存转储：

<!--[if !supportLists]-->1、 <!--[endif]-->开启命令行窗口并定位到调试目录中，键入如下命令（不要按回车键）：
adplus -hang -pn w3wp.exe -quiet

<!--[if !supportLists]-->2、 <!--[endif]-->利用上述的同时打开5个窗口 或 用tinyget 进行压力测试站点，以便重复问题
tinyget -srv:localhost -uri:/BuggyBits/FeaturedProducts.aspx -threads:30 -loop:50

<!--[if !supportLists]-->3、 <!--[endif]-->执行第2步中的方法时，在命令窗口中按下回车键，以获得内存快照信息。

Q：当使用 adplus hang 模式时，如何触动内存快照？

Q：获取内存快照时，需要怎样的权限呢？

Q：转储文件存储的位置？提示：查看windbg帮助中关于adplus/hang 模式的内容

在 windbg.exe 中打开转储文件

<!--[if !supportLists]-->1、 <!--[endif]-->打开windbg，选择文件->打开，打开转储的 *.dmp 文件；

<!--[if !supportLists]-->2、 <!--[endif]-->设置符号文件路径（查看 安装指南和信息 获取更多的内容）

<!--[if !supportLists]-->3、 <!--[endif]-->加载 sos （查看 安装指南和信息 获取更多的内容）

检查堆栈信息：

<!--[if !supportLists]-->1、 <!--[endif]-->检查本地的堆栈信息：
~* kb 2000

<!--[if !supportLists]-->2、 <!--[endif]-->检查 dotnet 堆栈信息：
~* e!clrstack

Q：Do you see any patterns or recognize any of the callstacks that suggests a thread is waiting for a synchronization mechanism?

跟踪诊断挂起现象：

<!--[if !supportLists]-->1、 <!--[endif]-->检查等待锁的线程ID：
!syncblk

0:000> !syncblk

Index SyncBlock MonitorHeld Recursion Owning Thread Info SyncBlock Owner

26 0018e4b4 19 1 001edef0 d3c 15 0160f440 System.Object

-----------------------------

Q：那个线程拥有锁？

Q：有多少线程正等待锁？（提示：MonitorHeld = 1 代表拥有者，2为等待者）

<!--[if !supportLists]-->2、 <!--[endif]-->挑选任何一个等待者（提示：等待线程用 AwareLock::Enter 标示），查看当前正在执行的任务；

~5s （切换到线程 5，用真实的线程ID替换5即可）
kb 2000 （检查本地堆栈信息）
!clrstack （查看dotnet 堆栈信息）

0:000> ~19s

eax=77e56bf0 ebx=00000000 ecx=7c99c0d8 edx=7c939b3f esi=00153080 edi=00153124

eip=7c92eb94 esp=0468fe1c ebp=0468ff80 iopl=0 nv up ei pl zr na pe nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246

ntdll!KiFastSystemCallRet:

7c92eb94 c3 ret

0:019> kb 2000

ChildEBP RetAddr Args to Child

WARNING: Stack unwind information not available. Following frames may be wrong.

0468ff80 77e56c22 0468ffa8 77e56a3b 00153080 ntdll!KiFastSystemCallRet

0468ff88 77e56a3b 00153080 0021fac8 0121fac8 rpcrt4!I_RpcBCacheFree+0x5ea

0468ffa8 77e56c0a 0015c008 0468ffec 7c80b50b rpcrt4!I_RpcBCacheFree+0x403

0468ffb4 7c80b50b 001e5598 0021fac8 0121fac8 rpcrt4!I_RpcBCacheFree+0x5d2

0468ffec 00000000 77e56bf0 001e5598 00000000 kernel32!GetModuleFileNameA+0x1b4

0:019> !clrstack

OS Thread Id: 0xf08 (19)

Unable to walk the managed stack. The current thread is likely not a

managed thread. You can run !threads to get a list of managed threads in

the process

Q：如何知道那个 dotnet 方法在等待锁？

<!--[if !supportLists]-->3、 <!--[endif]-->检查拥有者线程执行的内容：

~5s （切换到线程 5，用真实的线程ID替换5即可）
kb 2000 （检查本地堆栈信息）
!clrstack （查看dotnet 堆栈信息）

Q：为什么会阻塞？

<!--[if !supportLists]-->4、 <!--[endif]-->检查dotnet代码中的对应的方法，以验证我们的猜想。

提示：

但愿如下文章对诊断挂起问题有作用：

Things to ignore when debugging an ASP.NET Hang - Update for .NET 2.0

A Hang Scenario, Locks and Critical Sections

.NET Hang Debugging Walkthrough

Automated .NET Hang Analysis

调试愉快！

/Tess