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

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Message-ID: <20130309043912.GA2797@redhat.com>
Date:	Fri, 8 Mar 2013 23:39:12 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	sasha.levin@...cle.com
Subject: Re: BUG_ON(nd->inode != parent->d_inode);

On Fri, Mar 08, 2013 at 08:31:48PM -0800, Linus Torvalds wrote:
 > On Fri, Mar 8, 2013 at 7:50 PM, Dave Jones <davej@...hat.com> wrote:
 > >  > >
 > >  > > I have a feeling there were some sysfs ones that may still be unfixed.
 > >
 > > I was right..
 > >
 > > [  425.836722] general protection fault: 0000 [#1] PREEMPT SMP
 > 
 > You forgot to enable DEBUG_PAGE_ALLOC again, but I don't think it much
 > matters. It's another slab free poison thing.
 > 
 > The faulting instruction is
 > 
 >     mov    0x28(%rbx),%ecx
 > 
 > with %rbx having the value 6b6b6b6b6b6b6b6b.
 > 
 > > [  425.847859] RIP: 0010:[<ffffffff8123f657>]  [<ffffffff8123f657>] sysfs_find_dirent+0x47/0xf0
 > 
 > That seems to be
 > 
 >     if (hash != sd->s_hash)
 > 
 > from sysfs_name_compare() that has been inlined into
 > sysfs_find_dirent(). And where "sd" is the corrupted value. If I read
 > things right.
 > 
 > So it looks like the sysfs rbtree is corrupted or something. Adding
 > Greg to the cc.
 
oh , that rings a bell.  ISTR this had something to do with Sasha's idr changes.

	Dave

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