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Date:      Tue, 22 Jun 2010 14:00:16 -0700
From:      Doug Barton <dougb@FreeBSD.org>
To:        Alexander Motin <mav@FreeBSD.org>
Cc:        freebsd-current@FreeBSD.org
Subject:   Re: Timer panic on boot (r209434)
Message-ID:  <4C212460.1070200@FreeBSD.org>
In-Reply-To: <4C2118D1.3080903@FreeBSD.org>
References:  <4C211538.1040808@FreeBSD.org> <4C2115D2.5080504@FreeBSD.org> <4C2118D1.3080903@FreeBSD.org>

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On 06/22/10 13:10, Alexander Motin wrote:
> Doug Barton wrote:
>> On 06/22/10 12:55, Doug Barton wrote:
>>> Howdy,
>>> 
>>> I tried upgrading from r209351 to r209434 and got a panic related
>>> to the timer stuff while booting. You can see the panic and the
>>> backtrace here:
>>> 
>>> http://people.freebsd.org/~dougb/timer-panic-1.jpg 
>>> http://people.freebsd.org/~dougb/timer-panic-2.jpg 
>>> http://people.freebsd.org/~dougb/timer-panic-3.jpg
>> 
>> Hmmm, that could use a little more detail. :)  I have a Dell laptop
>> with a core 2 duo processor, running 9-current SMP i386.
> 
> Your ACPI seems reports that attimer uses IRQ2, instead of usual
> IRQ0. It is either a bug, or it is a very rare feature.
> 
> I am not sure it is not a hack, but you may try attached patch.

Ok, I updated to r209441, then applied your patch. FYI, I applied it in
src/sys/x86/isa/ using -p2. This allowed me to boot, verbose dmesg is at
http://people.freebsd.org/~dougb/dmesg-verbose-norid-patch.txt

> If it helps, it would be nice it you tried to use i8254 event timer,
> to check is this a bug or feature.

Ok, I'm willing to give that a try if you tell me how. :)


Doug

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