Re: SOS.dll loses symbol information

Thank you for your reply.
Ok, here we go from the start

Start windbg
Attach to the aspnet_wp process (loads all modules)

At the command line I type ".load clr10\sos.dll"

Then "!sym noisy"
noisy mode - symbol prompts on

then ".reload"
Reloading current modules
....................................................................................................................................................
DBGHELP: ntdll - public symbols

c:\symbols\ntdll.pdb\36515FB5D04345E491F672FA2E2878C02\ntdll.pdb

then "k"
ChildEBP RetAddr
05a6ffc8 7c9507a8 ntdll!DbgBreakPoint
05a6fff4 00000000 ntdll!DbgUiRemoteBreakin+0x2d


Now I set a breakpoint for CLR exceptions. The bp will dump the managed
stack and then continue.
"sxe -c "!cen;!clrstack -p;g" CLR"

Then I hit go and load the main page. The debugger outputs the managed
stack along with the param names and actual source code line numbers.

System.InvalidCastException (0x15bba80)
Thread 1
ESP EIP
0x0086f6f4 0x7c81eb33 [FRAME: HelperMethodFrame]
0x0086f720 0x04effa67 [DEFAULT] ValueClass System.DateTime
Microsoft.VisualBasic.CompilerServices.DateType.FromObject(Object)
0x0086f760 0x04eff92f [DEFAULT] ValueClass System.DateTime
CEC.Data.DBConvert.CvDate(Object)
at [+0x4f] [+0x1b]
PARAM: class System.Object obj: 0x00e7b8e0 (System.DBNull)
0x0086f7b0 0x0496c409 [DEFAULT] [hasThis] Void CEC.VC.User..ctor(I4)
at [+0x4b1] [+0x277]
PARAM: this: 0x015b7c10 (CEC.VC.User)
PARAM: int32 UserID: 3064790
0x0086f880 0x05866781 [DEFAULT] [hasThis] Void
VC.BreadCrumb.Page_Load(Object,Class System.EventArgs)
at [+0xa1] [+0x52]
C:\All_prod_Source\VC_MC\Controls\Components\BreadCrumb.ascx.vb:25
PARAM: this: 0x0151fa60 (ASP.BreadCrumb_ascx)
PARAM: class System.Object sender: 0x0151fa60 (ASP.BreadCrumb_ascx)
PARAM: class System.EventArgs e: 0x00ed0558
0x0086f8d4 0x00b2b55b [FRAME: MulticastFrame] [DEFAULT] [hasThis] Void
System.EventHandler.Invoke(Object,Class System.EventArgs)
0x0086f8e8 0x056437dc [DEFAULT] [hasThis] Void
System.Web.UI.Control.OnLoad(Class System.EventArgs)

Now this works again and again if I refresh the page. When I click on a
different link that brings me to another section of the site I get the
same invalid cast exception dump but without the lines and param names.

System.InvalidCastException (0x12ae12c)
Thread 1
ESP EIP
0x0086f584 0x7c81eb33 [FRAME: HelperMethodFrame]
0x0086f5b0 0x04effa67 [DEFAULT] ValueClass System.DateTime
Microsoft.VisualBasic.CompilerServices.DateType.FromObject(Object)
0x0086f5f0 0x04eff92f [DEFAULT] ValueClass System.DateTime
CEC.Data.DBConvert.CvDate(Object)
0x0086f640 0x091e8611 [DEFAULT] [hasThis] Void CEC.VC.User..ctor(I4)
0x0086f710 0x091e7b6f [DEFAULT] Void
CEC.VC.UserCache.CacheUserInfo(I4,SZArray String,Class
System.Web.SessionState.HttpSessionState)
0x0086f7b0 0x091e6fb8 [DEFAULT] [hasThis] Void
VC.Navigation.Page_Load(Object,Class System.EventArgs)
0x0086f8d4 0x00b2b55b [FRAME: MulticastFrame] [DEFAULT] [hasThis] Void
System.EventHandler.Invoke(Object,Class System.EventArgs)

..reload

Reloading current modules
....................................................................................................................................................
DBGHELP: ntdll - public symbols

c:\symbols\ntdll.pdb\36515FB5D04345E491F672FA2E2878C02\ntdll.pdb

k

ChildEBP RetAddr
07f9ffc8 7c9507a8 ntdll!DbgBreakPoint
07f9fff4 00000000 ntdll!DbgUiRemoteBreakin+0x2d

The output from those commands looks exactly the same. I'm at a loss as
to why it cannot use the symbol information.



Dan Nemesek wrote:
Hi,

Execute the following commands to get the debugger to tell you what it's
doing during resolution
"!sym noisy"

Then execute ".reload" to get the debugger to re-resolve symbols using the
current sym path. Execute a "k" command to resolve a stack that contains
the image your interested so you can see what it does. If your image is not
in a current stack you can force it to load by executing ".reload /f
myimage.ext"

Do this when the symbols resolve and then repeat when the symbols don't
resolve to see if you notice any difference.

Thanks,

Dan

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