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SubjectRe: Linux 2.6.26-rc4
> > 
> >
> >
> > 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

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


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