linux-kernel - Re: Linux 2.6.26-rc4

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Date:	Tue, 03 Jun 2008 12:45:33 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	viro@...IV.linux.org.uk
CC:	miklos@...redi.hu, jesper@...gh.cc, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: Linux 2.6.26-rc4

> > 
> > http://www.kerneloops.org/raw.php?rawid=12419&msgid=
> > 
> > Looks like a negative inode in S_ISDIR(mnt->mnt_root->d_inode->i_mode),
> > which would be due to NFS not properly filling in its root dentry?
> 
> Look more carefully.  It's path->dentry; aside of the fact that dentry
> pointer is fetched at offset 8 from one of the arguments (fits path->dentry,
> too low for mnt->mnt_root),

Yup, realized this after posting.

> do_add_mount() itself has just done S_ISLNK
> on the very same thing, so it'd die before getting to graft_tree().
> 
> No, it's either path_lookup() somehow returning a negative dentry in
> do_mount() (which shouldn't be possible, unless it's some crap around
> return_reval in __link_path_walk()) or it's follow_down() giving us
> a negative dentry.  Which almost certainly would've exploded prior to
> that...

I think it must be autofs4 doing something weird.  Like this in
autofs4_lookup_unhashed():

			/*
			 * Make the rehashed dentry negative so the VFS
			 * behaves as it should.
			 */
			if (inode) {
				dentry->d_inode = NULL;


Miklos
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