On Tue, 17 Jul 2007, Ingo Molnar wrote:
>
> i've got a new observation: changing CONFIG_HZ from 250 to 1000 makes
> the problem go away. So it's somehow also related to jiffies.
No, I suspect it's just related to timing: you need to hit that window
when the LIST_FROZEN bit is set, and since it was so reliable for you
before (and others didn't see it), your timing probably happened to hit it
exactly. And changing HZ probably just changed some timeout or softirq
getting called, and you didn't hit the bug any more.
Linus
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