In "passwd chat" description in smb.conf(5) says that "The chat sequence can also contain the standard macros \\n, \\r, \\ t and \\s..." , but \\n, \\r, \\t and \\s should be \n, \r, \t, \s respectively. (These substitutions exists at smbd/chgpasswd.c:pwd_sub().)
updating qa contact
Fixed. Thanks.
sorry for the same, cleaning up the database to prevent unecessary reopens of bugs.