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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Date:	Tue, 02 Feb 2010 07:55:17 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	"Justin P. Mattock" <justinmattock@...il.com>
CC:	Dan Carpenter <error27@...il.com>,
	linux1394-devel@...ts.sourceforge.net,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
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)

Justin P. Mattock wrote:
> As for anything changed in the kernel
> (2.6.31 - present), tough to say
> from what I remember I had created a new fresh
> lfs system using these CFLAGS:
> 
> CFLAGS="-mtune=core2 -march=core2 -O2 -pipe -fomit-frame-pointer"
> CXXFLAGS="${CFLAGS}" MAKEOPTS="{-j3}"
> (without -m option gcc defaults(I think)to -m32).
> 
> which booted with ohci1394_dma=early just fine.
> 
> then decided to build another lfs system with the same CFLAGS except
> added -m64 (pure64) to the build process.
> (then this showed up).
> 
> What I can try is do a git revert to 2.6.29/27 to see if this thing
> fires off(before going any further). if the system boots then do a bisect.

Do I understand correctly that at this moment it is only known that the
bug could be
  - *either* a 2.6.31 -> 2.6.32 regression
  - *or* an x86-64 specific bug that does not occur on x86-32,
right?

I have an Core 2 Duo based PC with x86-32 kernel and userland and an AMD
based x86-64 PC and could give ohci1394_dma=early a try on both (never
tested it myself before).  I could furthermore attempt to build and
install an x86-64 kernel on the Core 2 Duo PC but I am afraid I am far
too short of spare time for that.
-- 
Stefan Richter
-=====-==-=- --=- ---=-
http://arcgraph.de/sr/
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