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Date: Mon, 5 Jul 2004 15:04:18 +0000
From: Bosko Milekic <bmilekic@FreeBSD.org>
To: "Michael L. Hostbaek" <mich@freebsd.org>,
	Gleb Smirnoff <glebius@cell.sick.ru>, current@freebsd.org
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Subject: Re: today's CURRENT lockups
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1. What was the date of your previous sources (the working ones)?

2. What scheduler are you running with, have you tried the other
   one?

3. Is DDB, INVARIANTS, and/or WITNESS compiled into your kernel?

4. Any particular/interesting boot-time tunables or sysctl
   settings?

5. Can you reproduce without Mozilla in X?

6. Do you have serial console, if so can you get anything once
   the seeming "lockup" occurs? (it may not be a lockup, you
   might just not be able to see anything because of X dying).

7. Can you turn off ACPI and see if the problem goes away?

8. Can you backout the preemption change (jhb a few days ago)
   and see if the problem goes away?

Basically, there are a number of things you can do to further
help analyze the problem.

-Bosko