linux-kernel - Re: ohci1394_dma=early crash since 2.6.32 (was Re: [Bug #14487] PANIC: early exception 08 rip 246:10 error ffffffff810251b5 cr2 0)

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Message-ID: <4B6A90BB.7090405@gmail.com>
Date:	Thu, 04 Feb 2010 01:17:47 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	Ingo Molnar <mingo@...e.hu>, Dan Carpenter <error27@...il.com>,
	bernhard.kaindl@....net, Thomas Gleixner <tglx@...utronix.de>,
	linux1394-devel@...ts.sourceforge.net,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Rafael Wysocki <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ebiderman@...ssion.com, hpa@...or.com
Subject: Re: ohci1394_dma=early crash since 2.6.32 (was Re: [Bug		 #14487]
 PANIC: early exception 08 rip 246:10 error		 ffffffff810251b5 cr2 0)

On 02/04/10 01:11, Jan Beulich wrote:
>>>> "Justin P. Mattock"<justinmattock@...il.com>  04.02.10 10:04>>>
>> a quick google on this showed somewhere
>> at bootmem.c any ideas on this or where
>> this might be caused besides fixmap?
>> (or is fixmap the main location?);
>
> __native_set_fixmap() ->  set_pte_vaddr() ->  set_pte_vaddr_pud() ->
> fill_pte() ->  spp_getpage() ->  alloc_bootmem_pages() ->  panic().
>
> Jan
>
>

so something is using __native_set_fixmap
that's hitting some memory address then
set_fixmap_nocache(ohci1394_dma=early)
fires off hitting the same?

Justin P. Mattock
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