Port Bug Report: cache lookup failure

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name        : Brian Bradley
Your email address    : bwb@netwolves.com

Category        : runtime: back-end: SQL
Severity        : non-critical

Summary: cache lookup failure

System Configuration
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  Operating System   : FreeBSD-i386

  PostgreSQL version : 6.4

  Compiler used      : gcc version 2.7.2.1

Hardware:
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pentium/16MB i386

Versions of other tools:
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flex version 2.5.4, GNU Make version 3.75,

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Problem Description:
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Situation :

whenever I try to update or delete a row int the users table I get the error message

info fmgr : cache lookup failure.

update users set username = 'new' where username = 'old';
or
delete from users where username = 'old';

I can do selects with no problems at all.

TABLES:
create table users(username varchar(20) primary key,
                   last_name varchar(50),
                   first_name varchar(50),
                   password varchar(20),
                   email_on int4,
                   fs_on int4,
                   web_access_on int4,
                   comments text,
                   email_alias varchar(50),
                   email_forward varchar(50),
                   qouta int4,
                   date_created datetime);

create table user_groups(username varchar(20),
                         group_name varchar(20));

TRIGGERS:
CREATE TRIGGER users_for_key
        BEFORE DELETE OR UPDATE ON users
        FOR EACH ROW
        EXECUTE PROCEDURE check_foreign_key(1, 'cascade', 'username', 'user_groups', 'username');

CREATE TRIGGER users_user_groups_pri_key
        BEFORE INSERT OR UPDATE ON user_groups
        FOR EACH ROW
        EXECUTE PROCEDURE check_primary_key('username', 'users', 'username');

I am using the supplied refint.so stored procedure module.

After I rebuild the whole database this problem seems to disappear, but, will eventually reappear after a few hours. I
willthen have to rebuild again. 

Rebuilding the database is not an acceptable work around nor fix.

Could someone please lead me in the right direction ?

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Test Case:
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Problem seems to happen at random, and when two or more users are accessing the table. problem will continue until
tableis rebuilt. 

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Solution:
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