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Date: Tue, 12 Oct 2010 23:43:46 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Hans Petter Selasky <hselasky@c2i.net>
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Cc: freebsd-acpi@freebsd.org
Subject: Re: MacBookPro 5,1
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on 12/10/2010 15:25 Hans Petter Selasky said the following:
> On Tuesday 12 October 2010 13:15:26 Andriy Gapon wrote:
>> on 12/10/2010 13:09 Hans Petter Selasky said the following:
>>> Hi,
>>>
>>> My MacBookPro 5,1 does not boot using -current because memory inside the
>>> ACPI kernel module is used after free.
>>>
>>> The following patch temporily mitigates the problem:
>>>
>>> /usr/src/sys/dev/acpica/Osd/OsdMemory.c
>>>
>>> void
>>> AcpiOsFree(void *Memory)
>>> {
>>> + if (cold == 0)
>>>
>>>     free(Memory, M_ACPICA);
>>>
>>> }
>>>
>>> Is there any way to debug this from user-land?
>>
>> I think that the best way is to get a backtrace at least or better a
>> crashdump.
> 
> The crashdump is not helpful. It crashes at init time, while the actual free 
> happens very early during boot.

Still a backtrace would be useful, I think.
Or track all calls to AcpiOsFree, e.g. using DTrace or stack(9) or etc.

-- 
Andriy Gapon