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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

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Have you seen this yet?… – Oliver Salzburg May 28 '12 at 16:57
@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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