When reloading a device the ioctl interface was forgetting to drop a
reference on the new table.
--- diff/drivers/md/dm-ioctl.c	2003-06-17 10:06:19.000000000 +0100
+++ source/drivers/md/dm-ioctl.c	2003-06-17 10:06:58.000000000 +0100
@@ -894,6 +894,7 @@
 		dm_table_put(t);
 		return r;
 	}
+	dm_table_put(t);	/* md will have taken its own reference */
 
 	dev = dm_kdev(md);
 	set_device_ro(dev, (param->flags & DM_READONLY_FLAG));