windbg 解決 "System.InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool." 過程中碰見的問題

 

 

使用windbg可以調試asp.net中數據庫連接池是否超限的問題。詳見文章：

    http://blogs.msdn.com/b/spike/archive/2012/05/21/quot-system-invalidoperationexception-timeout-expired-the-timeout-period-elapsed-prior-to-obtaining-a-connection-from-the-pool-quot.aspx?CommentPosted=true#comments

 

我主要其實想說明的是，在搭建調試環境和進行調試過程中可能碰到的幾個問題：

1. The call to LoadLibrary(C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll) failed

0:000> .load C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
The call to LoadLibrary(C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll) failed, Win32 error 0n193
    "%1 is not a valid Win32 application."
Please check your debugger configuration and/or network access.

A：檢查你的windbg版本，是否為x86，估計你現在用的是x64，你想導入x86的clr.dll肯定出錯了...換個windbg或者導入：

.load C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll

2. Failed to find runtime DLL (clr.dll), 0x80004005

0:000> !dumpheap
Failed to find runtime DLL (clr.dll), 0x80004005
Extension commands need clr.dll in order to have something to do.

A：請先用.chain命令查看是否已經導入clr擴展：

0:000> .chain
Extension DLL search Path:
    ...//省略
Extension DLL chain:
    C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll: image 4.0.30319.239, built Sat Jul 09 17:44:20 2011
        [path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll]
    C:\Windows\Microsoft.NET\Framework64\v4.0.30319\SOS.dll: image 4.0.30319.239, API 1.0.0, built Sat Jul 09 18:00:43 2011
        [path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\SOS.dll]
    dbghelp: image 6.12.0002.633, API 6.1.6, built Tue Feb 02 04:15:44 2010
        [path: D:\WinDDK\7600.16385.1\Debuggers\dbghelp.dll]
    ext: image 6.12.0002.633, API 1.0.0, built Tue Feb 02 04:15:46 2010
        [path: D:\WinDDK\7600.16385.1\Debuggers\winext\ext.dll]
    exts: image 6.12.0002.633, API 1.0.0, built Tue Feb 02 04:15:38 2010
        [path: D:\WinDDK\7600.16385.1\Debuggers\WINXP\exts.dll]
    uext: image 6.12.0002.633, API 1.0.0, built Tue Feb 02 04:15:36 2010
        [path: D:\WinDDK\7600.16385.1\Debuggers\winext\uext.dll]
    ntsdexts: image 6.1.7650.0, API 1.0.0, built Tue Feb 02 04:15:18 2010
        [path: D:\WinDDK\7600.16385.1\Debuggers\WINXP\ntsdexts.dll]

如果已經導入了clr.dll，但是還是不行，那么估計你調試的是一個dump文件或者程序已經跑完。建議在程序即將結束處加個sleep，讓程序等待在那里，並且通過Open Excutable...的方式打開程序后，按g讓程序先跑起來，等掛起的時候，再按CTRL+BREAK，讓程序暫停，這個時候再倒入sos和clr擴展。現在再輸入!dumpheap應該就可以了。（參考：http://social.msdn.microsoft.com/Forums/en-US/clr/thread/59aa78c9-dc05-43c8-9efe-e7b132056afc/）