linux-kernel - Re: BUG_ON(nd->inode != parent->d

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Message-ID: <20130308233041.GA32587@redhat.com>
Date:	Fri, 8 Mar 2013 18:30:41 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: BUG_ON(nd->inode != parent->d_inode);

On Fri, Mar 08, 2013 at 03:20:40PM -0800, Linus Torvalds wrote:
 > On Fri, Mar 8, 2013 at 3:07 PM, Dave Jones <davej@...hat.com> wrote:
 > >
 > > Ok, got something more meaningful out of the lookup_slow trace.
 > >
 > > [   66.082984] parent->dname.name  (06b6b6b6b6b6b6b)
 > > [   66.083637] parent =
 > >
 > > At first I thought AH-HA! SLAB POISON!
 > > But look closer.. it's shifted by 8 bits.
 > 
 > Or just the high byte has been cleared.

Duh, yes. I wasn't zero padding, so that's 006b6b6b.

Here's another run, with something similar in path->dentry..

[  100.729395] parent->dname.name  (06 b6 b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b)
[  100.729397] path->dentry: 6d6e740 6b6b6b6b
[  100.729401] nd->last.name = (\xffffffd2.W._.N.".\xfffffffe.\xffffff80.^N.?.\xffffffe4.E.8.g.\xffffffd2.N.\xffffffb6.^G.\xfffffff1.\xffffffcc.U.\xffffffda.^_.h.^M.1.\xffffffc5.\xffffff82.%.B.\xffffffe0.\xffffffad.^U.8.^L.c.Z.^K.\xffffffe4.h.J.\xffffffc8.\xffffffad.\xffffff83./.\xffffff80.\xffffffd1.\xffffffe5.\xffffff87.\xffffffc3.\xffffffb2.\xffffffdc.\xffffff9d.\xffffffd1.E.\xffffffab.^B.
(garbage continues..)

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