From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russ Anderson Subject: Re: [regression, bisected] x86: efi: Pass boot services variable info to runtime code Date: Thu, 23 May 2013 17:23:21 -0500 Message-ID: <20130523222321.GB31880@sgi.com> References: <20130522162747.GA20816@sgi.com> <20130523115801.GJ14575@console-pimps.org> Reply-To: Russ Anderson Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20130523115801.GJ14575-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Matt Fleming Cc: Matthew Garrett , matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" List-Id: linux-efi@vger.kernel.org On Thu, May 23, 2013 at 12:58:01PM +0100, Matt Fleming wrote: > On Wed, 22 May, at 11:27:47AM, Russ Anderson wrote: > > [ 6.062157] EFI Variables Facility v0.08 2004-May-17 > > [ 6.067731] BUG: unable to handle kernel paging request at 000000007ca95b10 > > [ 6.075519] IP: [] 0xffff88007dbf213f > > This is a bit of a head scratcher. Could you paste the EFI memmap > entries in your dmesg for the regions that cover 0x7ca95b10 and > 0x7dbf2140? My guess would be that they're EFI runtime code regions, > which would at least explain why we seem to be executing code in the > direct mapping region (0xffff8800xxxxxxxx). > > Are you booting via the EFI boot stub? Interesting data point. The failure is on a rhel7/grub2 root. The identical kernel on a rhel6/grub root boots. So maybe grub2 brings out the failure? I suspect Fedora19/grub2 on EFI should hit the problem (for someone looking to reproduce it). In both cases the kernel boot line options are the same. -- Russ Anderson, OS RAS/Partitioning Project Lead SGI - Silicon Graphics Inc rja-sJ/iWh9BUns@public.gmane.org