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    <p>Install windbg (Windows debugger) on the target machine. Invoke the debugger, and attach to the suspicious process, run the program and then wait until problem happens. When the problem happens, invoke the following command in the debugger command line</p> <p>!runaway</p> <p>This will show which of your threads are consuming most of the time. Then get several thread stacks from that thread that is consuming most of your cpu resources.</p> <p>Here is an example:</p> <pre><code>0:015&gt; !runaway </code></pre> <p>User Mode Time Thread Time 0:1074 0 days 0:00:21.637 11:137c 0 days 0:00:02.792 4:12c8 0 days 0:00:00.530 9:1374 0 days 0:00:00.046 15:13d0 0 days 0:00:00.000 14:1204 0 days 0:00:00.000 13:154c 0 days 0:00:00.000 12:144c 0 days 0:00:00.000 10:1378 0 days 0:00:00.000 8:1340 0 days 0:00:00.000 7:12f0 0 days 0:00:00.000 6:12d4 0 days 0:00:00.000 5:12d0 0 days 0:00:00.000 3:12c4 0 days 0:00:00.000 2:12c0 0 days 0:00:00.000 1:12b4 0 days 0:00:00.000</p> <p>Now assume we want a call stack for the second thread in the list, thread 11, so we first switch to thread 11. This can be done by entering ~11s.</p> <pre><code>0:015&gt; ~11s </code></pre> <p>eax=03fbb270 ebx=ffffffff ecx=00000002 edx=00000060 esi=00000000 edi=00000000 eip=77475e74 esp=0572f60c ebp=0572f67c 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: 77475e74 c3 ret</p> <p>Now get a call stack for this thread by executing kp:</p> <pre><code>0:011&gt; kp ChildEBP RetAddr 0572f608 77475620 ntdll!KiFastSystemCallRet 0572f60c 75b09884 ntdll!NtWaitForSingleObject+0xc 0572f67c 75b097f2 kernel32!WaitForSingleObjectEx+0xbe *** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\Program Files\Mozilla Firefox 3.1 Beta 1\nspr4.dll - 0572f690 10019a0b kernel32!WaitForSingleObject+0x12 WARNING: Stack unwind information not available. Following frames may be wrong. 0572f6ac 10015979 nspr4!PR_MD_WAIT_CV+0x8b 0572f6c4 10015763 nspr4!PR_GetPrimordialCPU+0x79 *** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\Program Files\Mozilla Firefox 3.1 Beta 1\xul.dll - 0572f6e0 64d44d6a nspr4!PR_Wait+0x33 0572f708 64dbe67e xul!NS_CycleCollectorForget2_P+0x698a 0572f72c 10019b3f xul!gfxWindowsPlatform::FontEnumProc+0xfd4e 0572f734 10015d32 nspr4!PR_MD_UNLOCK+0x1f 0572f738 1001624b nspr4!PR_Unlock+0x22 0572f754 1001838d nspr4!PRP_TryLock+0x4cb 00000000 00000000 nspr4!PR_Now+0x109d </code></pre> <p>The command kp will print the parameters. Local variables can be printed with dv.</p> <p>Alternatively you can use process explorer from sysinternals.</p> <p>If all this is not possible, because it is a remote client machine, install userdump, which creates a dump file that can be sent to you for further analysis. You can create a batch file for the customer to invoke userdump with the correct parameters. Userdump is a tool from Microsoft, which can be downloaded from their web page.</p>
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    1. COI see numbers as identifiers for threads. How can I know which thread it is that is causing problems? Is there a way to know which method that particular thread is executing?
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    2. COThis was quite helpful. Now the only thing I need is to know what parameters have been sent to all the methods in the stack. How do I get the parameter values?
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