linux-ext4 - Re: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff

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Date:	Tue, 22 Apr 2008 02:54:43 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	paulmck@...ux.vnet.ibm.com, David Miller <davem@...emloft.net>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, akpm@...ux-foundation.org,
	linux-ext4@...r.kernel.org, herbert@...dor.apana.org.au,
	Zdenek Kabelac <zdenek.kabelac@...il.com>
Subject: Re: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff

On Tuesday, 22 of April 2008, Jiri Slaby wrote:
> On 04/22/2008 01:02 AM, Jiri Slaby wrote:
> > On 04/22/2008 12:54 AM, Paul E. McKenney wrote:
> >> On Tue, Apr 22, 2008 at 12:26:04AM +0200, Jiri Slaby wrote:
> >>>> Having slub_debug enabled, tomorrow will be results, I guess...
> 
> OK, methinks it's tomorrow yet, at least here.
> 
> >>> Sorry, one more entry:
> >>>
> >>> 00000000000000f0 dentry.d_op (Zdenek, offset ? around 136)
> > 
> > Zdenek's is at offset 184.
> > 
> >>> 00f0000000000000 dentry.d_hash.next (me, offset 24)
> >>> ffff81f02003f16c dentry.d_name.name (me, offset 56)
> >>>         memory ORed by 000000f000000000
> >>> fffff0002004c1b0 file.f_mapping (me, offset 176)
> >>>         memory hole, it was something like
> >>>         (ffff81002004c1b0 & ~00000f0000000000) | 0000f00000000000?
> >>> ffffffffffffffff dentry.d_hash.next (Rafael, offset ? around 24)
> >>>         -1, ~0ULL
> 
> The same place, dentry.d_hash.next is 1. No slub debug clues... I think, I'll 
> give slab a try. Any other clues?

Well, SLUB uses some per CPU data structures.  Is it possible that they get
corrupted and which leads to the observed symptoms?
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