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Date:      Mon, 24 May 2004 11:47:20 -0400
From:      John Baldwin <jhb@FreeBSD.org>
To:        freebsd-current@FreeBSD.org
Cc:        Jason King <jasonking@sbcglobal.net>
Subject:   Re: lockups
Message-ID:  <200405241147.20382.jhb@FreeBSD.org>
In-Reply-To: <40B028CE.7050606@sbcglobal.net>
References:  <40A43E86.6040504@sbcglobal.net> <200405171109.33349.jhb@FreeBSD.org> <40B028CE.7050606@sbcglobal.net>

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On Sunday 23 May 2004 12:30 am, Jason King wrote:
> John Baldwin wrote:
> >On Friday 14 May 2004 08:54 pm, Jason King wrote:
> >>ok i'm a dumbass... in my haste this morning, i commented out the wrong
> >>line in my config file, so when i tried disabling mixed mode, apic
> >>support wasn't even compiled in the kernel.  So to make extra sure, I
> >>went back and explicitly tried it with the 5.2.1-RELEASE cd (disabling
> >>apic worked, disabling mixed mode did not), so its really something
> >>related to apic support.  So next question, what can I do to track down
> >>the problem?  Any suggestions for resources to understand how the apic
> >>stuff works?  Might there be a way to grab the kernel messages even
> >>after a reboot since the lockups don't even my to drop to the debugger?
> >>Doing a boot -v generated a bunch of text that I couldn't read as it
> >>scrolled by too fast, and I'm wondering if it might possibly help shed
> >>some light as to what's going on...
> >
> >Note that you can't disable mixed mode via a tunable on 5.2.1, so you
> > might want to retest disabling mixed mode.  However, the first steps are
> > to work on the non-ACPI case as that is easiest.  I'll need 'mptable'
> > output and dmesg output from a verbose boot with APIC enabled and ACPI
> > disabled if you can get that.  Thanks.
>
> Unfortunately, booting with ACPI disabled and apic enabled still caused
> the system to hang.  So anytime apic is enabled, the system locks up.
> (i've tried just the kernel with no modules loaded as well as with the
> normal modules I use loaded, locks up, but in a different place).  I was
> able to pull off the output from a boot -v using a serial console.  I've
> attached that.  Hopefully that helps...

Can you provide mptable output?

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org



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