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    SubjectRe: [AppArmor 33/41] Add d_namespace_path() to obtain namespace relative pathnames
    > +char *d_namespace_path(struct dentry *dentry, struct vfsmount *vfsmnt,
    > + char *buf, int buflen)
    > +{
    > + char *res;
    > + struct vfsmount *rootmnt, *nsrootmnt;
    > + struct dentry *root;
    > +
    > + read_lock(&current->fs->lock);
    > + rootmnt = mntget(current->fs->rootmnt);
    > + read_unlock(&current->fs->lock);
    > + spin_lock(&vfsmount_lock);
    > + nsrootmnt = mntget(rootmnt->mnt_ns->root);

    ... and when somebody does umount -l on your chroot jail, you get
    NULL ->mnt_ns. Oops...
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