cannot run sos comamnd for Silverlight 4.0 app in IE 8.0

I am trying to debug my silverlight application running under IE8.0. Its using .NET framework 4.0 and Silverlight 4.0. So I attach Windbg to IE running instance, I understand that with IE8 I need to connect to right instance of internet explorer. So when I attach here are the dlls that been shown as loaded in the process. As you can see the coreclr is loaded in there.

Executable search path is: ModLoad: 00a00000 00a9c000 C:\Program Files\Internet Explorer\IEXPLORE.EXE

ModLoad: 77890000 779b8000 C:\Windows\system32\ntdll.dll

ModLoad: 76450000 7652c000 C:\Windows\system32\kernel32.dll

ModLoad: 76380000 76446000 C:\Windows\system32\ADVAPI32.dll

ModLoad: 779d0000 77a93000 C:\Windows\system32\RPCRT4.dll

ModLoad: 76680000 7671d000 C:\Windows\system32\USER32.dll

ModLoad: 77aa0000 77aeb000 C:\Windows\system32\GDI32.dll

ModLoad: 77590000 7763a000 C:\Windows\system32\msvcrt.dll

ModLoad: 77530000 77589000 C:\Windows\system32\SHLWAPI.dll

ModLoad: 76940000 77451000 C:\Windows\system32\SHELL32.dll

ModLoad: 76530000 76675000 C:\Windows\system32\ole32.dll

ModLoad: 75f60000 76149000 C:\Windows\system32\iertutil.dll

ModLoad: 77750000 77883000 C:\Windows\system32\urlmon.dll

ModLoad: 768b0000 7693d000 C:\Windows\system32\OLEAUT32.dll

ModLoad: 77730000 7774e000 C:\Windows\system32\IMM32.DLL

ModLoad: 77460000 77528000 C:\Windows\system32\MSCTF.dll

ModLoad: 76330000 76339000 C:\Windows\system32\LPK.DLL

ModLoad: 6be40000 6c8d5000 C:\Windows\system32\IEFRAME.dll

ModLoad: 76220000 76293000 C:\Windows\system32\comdlg32.dll

ModLoad: 72570000 725a3000 C:\Program Files\Internet Explorer\IEShims.dll

ModLoad: 74f60000 74f9f000 C:\Windows\system32\uxtheme.dll

ModLoad: 75de0000 75dfe000 C:\Windows\system32\USERENV.dll

ModLoad: 75dc0000 75dd4000 C:\Windows\system32\Secur32.dll

ModLoad: 75430000 7546b000 C:\Windows\system32\rsaenh.dll

ModLoad: 76720000 768aa000 C:\Windows\system32\SETUPAPI.dll

ModLoad: 73e40000 73efb000 C:\Windows\system32\PROPSYS.dll

ModLoad: 762a0000 76324000 C:\Windows\system32\CLBCatQ.DLL

ModLoad: 722c0000 72300000 C:\Program Files\Internet Explorer\ieproxy.dll

ModLoad: 6eae0000 6eb33000 C:\Windows\system32\ACTXPRXY.DLL

ModLoad: 77640000 77726000 C:\Windows\system32\WININET.dll

ModLoad: 76370000 76373000 C:\Windows\system32\Normaliz.dll

ModLoad: 76340000 7636d000 C:\Windows\system32\ws2_32.dll

ModLoad: 779c0000 779c6000 C:\Windows\system32\NSI.dll

ModLoad: 75d30000 75d5c000 C:\Windows\system32\apphelp.dll

ModLoad: 74460000 744aa000 C:\Windows\system32\RASAPI32.dll

ModLoad: 74440000 74454000 C:\Windows\system32\rasman.dll

ModLoad: 75bf0000 75c66000 C:\Windows\system32\NETAPI32.dll

ModLoad: 75e90000 75e97000 C:\Windows\system32\PSAPI.DLL

ModLoad: 74170000 741a1000 C:\Windows\system32\TAPI32.dll

ModLoad: 74430000 7443c000 C:\Windows\system32\rtutils.dll

ModLoad: 74130000 74162000 C:\Windows\system32\WINMM.dll

ModLoad: 740f0000 7412d000 C:\Windows\system32\OLEACC.dll

ModLoad: 75830000 75922000 C:\Windows\system32\CRYPT32.dll

ModLoad: 75990000 759a2000 C:\Windows\system32\MSASN1.dll

ModLoad: 6ffe0000 6ffe6000 C:\Windows\system32\sensapi.dll

ModLoad: 755f0000 755f7000 C:\Windows\system32\credssp.dll

ModLoad: 754c0000 75506000 C:\Windows\system32\schannel.dll

ModLoad: 75120000 75134000 C:\Windows\system32\wpclsp.dll

ModLoad: 759b0000 759c1000 C:\Windows\system32\SAMLIB.dll

ModLoad: 75200000 7520f000 C:\Windows\system32\NLAapi.dll

ModLoad: 75790000 757a9000 C:\Windows\system32\IPHLPAPI.DLL

ModLoad: 75750000 75785000 C:\Windows\system32\dhcpcsvc.DLL

ModLoad: 759d0000 759fc000 C:\Windows\system32\DNSAPI.dll

ModLoad: 75740000 75747000 C:\Windows\system32\WINNSI.DLL

ModLoad: 75710000 75732000 C:\Windows\system32\dhcpcsvc6.DLL

ModLoad: 755b0000 755eb000 C:\Windows\system32\mswsock.dll

ModLoad: 754b0000 754b5000 C:\Windows\System32\wshtcpip.dll

ModLoad: 709e0000 709e6000 C:\Windows\system32\rasadhlp.dll

ModLoad: 70a40000 70a70000 C:\Windows\system32\MLANG.dll

ModLoad: 75230000 75251000 C:\Windows\system32\NTMARTA.DLL

ModLoad: 76150000 76199000 C:\Windows\system32\WLDAP32.dll

ModLoad: 756a0000 756a8000 C:\Windows\system32\VERSION.dll

ModLoad: 75690000 75695000 C:\Windows\System32\wship6.dll

ModLoad: 704d0000 704df000 C:\Windows\system32\napinsp.dll

ModLoad: 70490000 704a2000 C:\Windows\system32\pnrpnsp.dll

ModLoad: 704c0000 704c8000 C:\Windows\System32\winrnr.dll

ModLoad: 704b0000 704bc000 C:\Windows\system32\wshbth.dll

ModLoad: 75290000 752a5000 C:\Windows\system32\GPAPI.dll

ModLoad: 757f0000 7582a000 C:\Windows\system32\slc.dll

ModLoad: 6ffc0000 6ffdb000 C:\Windows\system32\cryptnet.dll

ModLoad: 74ef0000 74f05000 C:\Windows\system32\Cabinet.dll

ModLoad: 56070000 563d9000 c:\Program Files\Microsoft Silverlight\4.0.60129.0\coreclr.dll

Here is the output of chain command

0:027> .chain

Extension DLL search Path:

C:\Program Files\Debugging Tools for Windows (x86)\WINXP;C:\Program Files\Debugging Tools for Windows (x86)\winext;C:\Program Files\Debugging Tools for Windows (x86)\winext\arcade;C:\Program Files\Debugging Tools for Windows (x86)\pri;C:\Program Files\Debugging Tools for Windows (x86);C:\Program Files\Debugging Tools for Windows (x86)\winext\arcade;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;c:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\;C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\;C:\Program Files\Microsoft Windows Performance Toolkit\;C:\Program Files\QuickTime\QTSystem\;C:\Program Files\Windows Live\Shared

Extension DLL chain:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\sos.dll: image 4.0.30319.225, API 1.0.0, built Wed Feb 09 23:49:57 2011

[path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\sos.dll]

C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll: image 4.0.30319.225, built Wed Feb 09 23:24:43 2011

[path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll]

C:\Program Files\Microsoft Silverlight\4.0.60129.0\coreclr: image 4.0.60129.0, built Sat Jan 29 02:06:01 2011

[path: C:\Program Files\Microsoft Silverlight\4.0.60129.0\coreclr.dll]

C:\Program Files\Microsoft Silverlight\4.0.60129.0\sos.dll: image 4.0.60129.0, API 1.0.0, built Sat Jan 29 02:07:57 2011

[path: C:\Program Files\Microsoft Silverlight\4.0.60129.0\sos.dll]

C:\Program Files\Microsoft Silverlight\4.0.60129.0\sos: image 4.0.60129.0, API 1.0.0, built Sat Jan 29 02:07:57 2011

[path: C:\Program Files\Microsoft Silverlight\4.0.60129.0\sos.dll]

C:\Windows\Microsoft.NET\Framework\v2.0.50727\sos: image 2.0.50727.4211, API 1.0.0, built Mon Oct 25 01:31:50 2010

[path: C:\Windows\Microsoft.NET\Framework\v2.0.50727\sos.dll]

dbghelp: image 6.12.0002.633, API 6.1.6, built Mon Feb 01 15:08:26 2010

[path: C:\Program Files\Debugging Tools for Windows (x86)\dbghelp.dll]

ext: image 6.12.0002.633, API 1.0.0, built Mon Feb 01 15:08:31 2010

[path: C:\Program Files\Debugging Tools for Windows (x86)\winext\ext.dll]

exts: image 6.12.0002.633, API 1.0.0, built Mon Feb 01 15:08:24 2010

开发者_Python百科 [path: C:\Program Files\Debugging Tools for Windows (x86)\WINXP\exts.dll]

uext: image 6.12.0002.633, API 1.0.0, built Mon Feb 01 15:08:23 2010

[path: C:\Program Files\Debugging Tools for Windows (x86)\winext\uext.dll]

ntsdexts: image 6.1.7650.0, API 1.0.0, built Mon Feb 01 15:08:08 2010

[path: C:\Program Files\Debugging Tools for Windows (x86)\WINXP\ntsdexts.dll]

Problem is that after loading sos when I try to load sos, I get following error.

0:027> .loadby sos coreclr

0:027> !threads

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

Extension commands need clr.dll in order to have something to do.

Any idea what I am doing wrong here?

I think the reason is .net framework 4.0 sos is loaded. You would have unload .net framework sos using .unload command. You could see the .net framework sos loaded in .chain output.

I think Naveen is right. Check your chain result, you'll see

[path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\sos.dll]

and then further down

[path: C:\Program Files\Microsoft Silverlight\4.0.60129.0\sos.dll]