BUG #1802: index is not a btree

The following bug has been logged online:

Bug reference:      1802
Logged by:          Jenny Wang
Email address:      y6108@vip.sina.com
PostgreSQL version: 7.3.10
Operating system:   RedHat 8
Description:        index is not a btree
Details:

1 $ cd <prefix>
  $ cd bin

2 $ ./postmaster -D data &
  $ ./psql TEST
  TEST=#create table a(col1 int primary key);

3 $ kill -9 <postmaster pid>

4 $ ./postmaster -D data &
  $ ./psql TEST
  TEST=#insert into a values(1);

  ERROR:  Index a_pkey is not a btree

  the file of a_pkey has size 8k, and is all zero.