I'm still trying to figure out the cause of my BUG at dcache.c:666,
so as I walk through the code a few more nitpicks:

Quoting Oren Laadan (orenl-eQaUEPhvms7ENvBUuze7eA@public.gmane.org):

+int cr_scan_fds(struct files_struct *files, int **fdtable)
+{
+	struct fdtable *fdt;
+	int *fds;
+	int i, n = 0;
+	int tot = CR_DEFAULT_FDTABLE;
+
+	fds = kmalloc(tot * sizeof(*fds), GFP_KERNEL);
+	if (!fds)
+		return -ENOMEM;
+
+	/*
+	 * We assume that the target task is frozen (or that we checkpoint
+	 * ourselves), so we can safely proceed after krealloc() from where
+	 * we left off; in the worst cases restart will fail.
+	 */
+
+	spin_lock(&files->file_lock);
+	rcu_read_lock();
+	fdt = files_fdtable(files);
+	for (i = 0; i < fdt->max_fds; i++) {
+		if (!fcheck_files(files, i))
+			continue;
+		if (n == tot) {
+			/*
+			 * fcheck_files() is safe with drop/re-acquire
+			 * of the lock, because it tests:  fd < max_fds
+			 */
+			spin_unlock(&files->file_lock);
+			rcu_read_unlock();
+			tot *= 2;	/* won't overflow: kmalloc will fail */
+			fds = krealloc(fds, tot * sizeof(*fds), GFP_KERNEL);
+			if (!fds) {
+				kfree(fds);

If !fds kfree(fds)  :)

+				return -ENOMEM;
+			}
+			rcu_read_lock();
+			spin_lock(&files->file_lock);
+		}
+		fds[n++] = i;
+	}
+	rcu_read_unlock();
+	spin_unlock(&files->file_lock);
+
+	*fdtable = fds;
+	return n;
+}
+static int
+cr_write_fd_ent(struct cr_ctx *ctx, struct files_struct *files, int fd)
+{
+	struct cr_hdr h;
+	struct cr_hdr_fd_ent *hh = cr_hbuf_get(ctx, sizeof(*hh));
+	struct file *file = NULL;
+	struct fdtable *fdt;
+	int objref, new, ret;
+	int coe = 0;	/* avoid gcc warning */
+
+	rcu_read_lock();
+	fdt = files_fdtable(files);
+	file = fcheck_files(files, fd);
+	if (file) {
+		coe = FD_ISSET(fd, fdt->close_on_exec);
+		get_file(file);
+	}
+	rcu_read_unlock();
+
+	/* sanity check (although this shouldn't happen) */
+	if (!file) {
+		ret = -EBADF;

(As mentioned on irc - and probably already fixed in your v9 - you to an
fput(NULL) in this case which will bomb)

+		goto out;
+	}
+
+	new = cr_obj_add_ptr(ctx, file, &objref, CR_OBJ_FILE, 0);
+	cr_debug("fd %d objref %d file %p c-o-e %d)\n", fd, objref, file, coe);
+
+	if (new < 0) {
+		ret = new;
+		goto out;
+	}
+
+	h.type = CR_HDR_FD_ENT;
+	h.len = sizeof(*hh);
+	h.parent = 0;
+
+	hh->objref = objref;
+	hh->fd = fd;
+	hh->close_on_exec = coe;
+
+	ret = cr_write_obj(ctx, &h, hh);
+	if (ret < 0)
+		goto out;
+
+	/* new==1 if-and-only-if file was newly added to hash */
+	if (new)
+		ret = cr_write_fd_data(ctx, file, objref);
+
+out:
+	cr_hbuf_put(ctx, sizeof(*hh));
+	fput(file);
+	return ret;
+}
+
+int cr_write_files(struct cr_ctx *ctx, struct task_struct *t)
+{
+	struct cr_hdr h;
+	struct cr_hdr_files *hh = cr_hbuf_get(ctx, sizeof(*hh));
+	struct files_struct *files;
+	int *fdtable;
+	int nfds, n, ret;
+
+	h.type = CR_HDR_FILES;
+	h.len = sizeof(*hh);
+	h.parent = task_pid_vnr(t);
+
+	files = get_files_struct(t);
+
+	nfds = cr_scan_fds(files, &fdtable);
+	if (nfds < 0) {
+		put_files_struct(files);

need a cr_hbuf_put()

+		return nfds;
+	}
+

(Cause of my BUG() doesn't appear to be here :( )

thanks,
-serge
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