diff -r 70b4267862e0 fs/reiserfs/journal.c
--- a/fs/reiserfs/journal.c	Mon Jul 09 00:00:31 2007 +0000
+++ b/fs/reiserfs/journal.c	Mon Sep 10 09:37:39 2007 -0400
@@ -3165,6 +3165,7 @@ int journal_begin(struct reiserfs_transa
 			 */
 			reiserfs_warning(p_s_sb,
 					 "clm-2100: nesting info a different FS");
+			WARN_ON(1);
 			th->t_handle_save = current->journal_info;
 			current->journal_info = th;
 		}