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Date:      Wed, 17 Nov 2010 21:30:13 -0800
From:      Julian Elischer <julian@freebsd.org>
To:        Marcin Wisnicki <mwisnicki+freebsd@gmail.com>
Cc:        freebsd-current@freebsd.org
Subject:   Re: www/chromium crashing whole system
Message-ID:  <4CE4B9E5.3000005@freebsd.org>
In-Reply-To: <ic1d57$ol9$1@dough.gmane.org>
References:  <20101113112447.GF2392@deviant.kiev.zoral.com.ua>	<20101113115900.GA14975@freebsd.org>	<20101113122853.GG2392@deviant.kiev.zoral.com.ua>	<20101113123846.GA21390@freebsd.org>	<20101113124146.GH2392@deviant.kiev.zoral.com.ua>	<20101113124758.GA23469@freebsd.org>	<alpine.BSF.2.00.1011132206380.12353@fledge.watson.org>	<4CDF0E7F.3060406@freebsd.org> <ibsl25$23m$1@dough.gmane.org>	<20101116224156.GA52556@freebsd.org>	<20101117033520.GA95666@freebsd.org> <ic1d57$ol9$1@dough.gmane.org>

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On 11/17/10 12:15 PM, Marcin Wisnicki wrote:
> On Wed, 17 Nov 2010 03:35:20 +0000, Alexander Best wrote:
>
>> On Tue Nov 16 10, Alexander Best wrote:
>>> WOW! this is the first time i hear of such a concept. it seems great
>>> for people like me who are desktop users without any serial/firewire
>>> consoles or any additional debugging hardware.
>>>
>>> is there a way of trying this out somehow? personally i wouldn't need
>>> the memory dump to work in partitions. i'd simply blug in a blank usb
>>> stick and have the memory dump dd'ed onto it. i think adding partition
>>> awareness is not really needed.
>> ok i read some more details and i think i figured out how to dump the
>> memory to a usb stick. question still remains however: will i be able to
>> use that memory snapshot in kgdb or gdb?
>>
> Probably not. I thought about it a bit more and realized that you will
> miss state of cpu registers which is rather important.
>
> How does debugging over firewire work if it only has access to host RAM ?

registers are saved to ram as part of exception handling..

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