linux-kernel - Re: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff

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Date:	Mon, 21 Apr 2008 15:35:20 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-ext4@...r.kernel.org
Subject: Re: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff

On Monday, 21 of April 2008, Ingo Molnar wrote:
> 
> * Rafael J. Wysocki <rjw@...k.pl> wrote:
> 
> > Hi,
> > 
> > I've just got the following traces from 2.6.25-git2 on HP nx6325 
> > (64-bit). I think they are related to the hang I described yesterday:
> 
> > [12844.112673]  [<ffffffff8029e236>] do_lookup+0x2c/0x1b2
> > [12844.112683]  [<ffffffff802a04b4>] __link_path_walk+0x8e6/0xdbd
> > [12844.112707]  [<ffffffffa004deb4>] ? :ext3:ext3_xattr_get_acl_default+0x18/0x1a
> > [12844.112714]  [<ffffffff802b0869>] ? generic_getxattr+0x4e/0x5c
> 
> so you've got ext3. Nothing changed in the VFS or in ext3 in -git yet.
> 
> the instruction pattern:
> 
> Code: f6 43 04 10 75 06 f0 ff 03 48 89 d8 fe 43 08 eb 31 fe 43 08 48 8b 
> 45 d0 48 8b 00 48 89 45 d0 48 8b 45 d0 48 85 c0 74 18 48 89 c2 <48> 8b 
> 00 48 8d 5a e8 44 39 73 30 0f 18 08 75 d9 e9 6a ff ff ff
>                            ========
> 
> shows that you've got "prefetchnta (%esi)" indirect:
> 
>    0f 18 00                prefetcht0 (%eax)
> 
> so the prefetch instructions are patched in, neither the compiler nor 
> the CPU should ignore them.

Well, I don't really know what that means ...

Besides, that's 64-bit code, but I guess that doesn't matter here.

Thanks,
Rafael
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