Backend crash while indexing large strings

Stephen van Egmnond (svanegmond@home.com) reports a bug with a severity of 1
The lower the number the more severe it is.

Short Description
Backend crash while indexing large strings

Long Description
The attached sql crashed Postgres 7.0.2 on a debian linux system (intel), using the packages 7.0.2-6.

The crash exhibits a wierd dynamic. Any of the following will avert a crash:

* remove the foo_key primary key and associated inserts
* remove the insert just before the index
* insert fewer large strings, e.g. 10 instead of 100. On my system, the magic number is 16.

Sample Code
drop table foo;
create table foo (
        foo_key integer,
        random  varchar(1000)
);
create sequence foo_sequence start 200;

-- create a pl/sql procedure
drop function thrash_database(integer);
create function  thrash_database(integer) RETURNS integer AS '
declare
        i integer;
        v_number_of_rows alias for $1;
begin
  FOR i IN 1..v_number_of_rows LOOP
    insert into foo (foo_key, random) values (nextval(''foo_sequence''),
''abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij'');
  END LOOP;
return 1;
END;
' language 'plpgsql';

-- change 100 to 10 to avert a crash.
select thrash_database(100);

-- comment out the following line to avert a crash
insert into foo values (1, '1');

create index foo_on_random on foo ( random );

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