On Mon, Apr 16, 2007 at 12:10:51PM -0700, Michael Chan wrote:
> On Sat, 2007-04-14 at 17:20 -0700, Michael Chan wrote:
>
> > I also like Andi's idea of using change_page_attr() to isolate the
> > problem. I'll try to send you a debug patch in the next few days to try
> > that out. Thanks.
>
> Here's the debug patch for x86 only that will change the statistics
> memory block to read-only. If the kernel is corrupting it, you should
> get a page fault that will crash the system. If you continue to see
> bogus counters, it is definitely a firmware or hardware problem. Please
> try it and let me know. Thanks.
Ahh. Would truly love to but the moment you said 'crash the system' I
had to bail. These boxes are in production and as such a crash would be,
shall we say, unwelcome. I might be able to fenagle something but I
very-much doubt it.
Perhaps Jean-Daniel, who is also experiencing this problem and seemingly
more frequently then I, has a box that he could run your patch on. I
think we both run pretty-much the same hardware (Dell [12]950s). I've
CCed him.
--
"To the extent that we overreact, we proffer the terrorists the
greatest tribute."
- High Court Judge Michael Kirby
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