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What do the red negative numbers I'm seeing displayed in htop mean?

What do these mean?

Should I be worried?

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It's probably just arithmetic overflow, and htop using a signed datatype where it should be unsigned. The column shows the accumulated CPU time for those processes.

You should not be worried.

(What is your uptime? Is it a VPS?)

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EC2 instance. Uptime is 53 days, 23 hours. – David Eyk Mar 29 '11 at 20:12
Thing is, I have another instance that's been up 867 days, with a mysql process that's logged 389 hours, and never seen anything like this in htop. – David Eyk Mar 29 '11 at 20:14
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