windbg + sos: cannon & shotgun

WINDBG + SOS: CANNON &SHOTGUN

you should include in your toolkit

Information Windbg

Not fancy but strong

SOS Son of strike

The Tools SOS Windbg

Part of .NET

Part of Debugging Tools, Download

We already have IDE, why Windbg

We have not IDE in Product Env We have not source code in Product Env Do not use windbg if you have IDE and

source code

Debugging Open executable (Ctrl + E)

Before CLR boot strap Attach to process (F6)

.detach and qd will leave process running Open Crash dump (Ctrl + D)

Offline debugging

Dumps Task Manager

Vista or newer ADPlus ProcDump

ADPlus Vbs versus exe Crash dump

adplus -crash -pn w3wp.exe -o c:\crashdump

Hang dump adplus -hang -pn w3wp.exe -o c:\

crashdump

Task Manager

Useful Commands

Inspecting CLR !gcroot !finzlizequeue !eeheep !dumpdomain

Meta and code !name2ee !dumpmt !u

Inspecting data !dumpheap !dumpobject (!do) !objsize !dumparray

Inspecting threads !threads !syncblk Clrstack !runaway

Setting up the Windbg srv*c:\symbols*http://

msdl.microsoft.com/download/symbols .loadby sos mscorwks

3.5 and 2.0 loadby sos clr

4.0

Start from Dining Philosophers

Demo http://www.cnblogs.com/ivenxu/articles/2

020974.html

Conclusion !syncblk and !clrstack are the key to

dead lock

Crash

Demo http://www.cnblogs.com/ivenxu/articles/1

970562.html

Conclusion !printexception (!pe) is key to detect

exception ~*e!clrstack always work but time cost

Scripting .foreach (name {<loop command>})

{<command name} .foreach(myVariable {!dumpheap -min

85000 -short}){.echo myVariable;!do myVariable;.echo *************}

PowerDbg http://powerdbg.codeplex.com/

Q & A Thanks