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I have a Lenovo X220 laptop on which I've installed Windows 8 Consumer Preview. Sometimes though it'll get stuck using 100% of a CPU core though in the SYSTEM process, and there's nothing I can do to view the stack here to narrow it down to a specific component, because the system process is "protected".

The strange thing here is that the issue seems to be intermittent. 99% of the time everything works fine, but sometimes it'll just start doing this. Rebooting fixes the issue.

Process Explorer (after getting debug symbols turned on) says the following:

Process Explorer Output

What steps might I take to troubleshoot this?

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closed as too localized by slhck May 11 '13 at 19:39

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Have you seen this yet? superuser.com/questions/404617/… –  Oliver Salzburg May 28 '12 at 16:57
1  
@Oliver: Doesn't seem to be related; I'm not really having perf issues and I already know that the CPU spike is in ntoskrnl, which is the kind of information you'd get from such tools. (I'm more concerned about the battery life suck) –  Billy ONeal May 28 '12 at 18:22
    
Have you just let it run and watched the memory usage? I suspect you have a memory leak in one of your device drivers, but the only way to know is to see if the machine blue-screens with an out of memory error (and if you're watching the memory graph in Task Manager, this is a good indicator). –  user3463 May 28 '12 at 23:14
    
@RandolphWest: There are no memory usage problems. (I can see that just by watching process explorer -- the system process is using no more memory than it was half an hour ago.) –  Billy ONeal May 29 '12 at 0:42
    
Well that's good news, at least. Can you please post what is showing in the Stack view of that process next time it happens? –  user3463 May 29 '12 at 2:14
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