BUG #6643: [PostgreSQL9.2beta1] COPY after changing fillfactor gets a PANIC.

The following bug has been logged on the website:

Bug reference: 6643
Logged by: Tomonari Katsumata
Email address: katsumata(dot)tomonari(at)po(dot)ntts(dot)co(dot)jp
PostgreSQL version: Unsupported/Unknown
Operating system: RHEL 6.2 x86_64
Description:

Hi,

Now, I'm testing PostgreSQL 9.2 Beta 1.
And I have a problem.

Steps to procedure are bellow.

1. CREATE DATABASE
export LANG=C
initdb -D $PGDATA -E SQL_ASCII
pg_ctl start
createdb testdb

2. CREATE TABLE
psql -d testdb -f ./create_table_customer.sql

3. ALTER TABLE(fillfactor)
psql -d testdb -c "ALTER TABLE customer SET (fillfactor=90);"

4. LOAD DATA
(please set correct path to customer.data)
psql -d testdb -f ./customer.sql

Then, I have a PANIC error.
==============================
BEGIN
TRUNCATE TABLE
PANIC: failed to add tuple to page
CONTEXT: COPY customer, line 296:
"296>ALNGAT>alngat>EgBEEAyXVIAWBE>KCiDDFsqA8Kv>2586068>4067234479>ALNGAT(at)kuvkaEEyi>20100905>20101023>..."
STATEMENT: COPY customer FROM
'/home/katsumata/work/2012/20120516_PG92beta1_bug1/copy_panic_dbt1/copy_panic/customer.data'
WITH DELIMITER '>';
psql:./customer.sql:3: PANIC: failed to add tuple to page
CONTEXT: COPY customer, line 296:
"296>ALNGAT>alngat>EgBEEAyXVIAWBE>KCiDDFsqA8Kv>2586068>4067234479>ALNGAT(at)kuvkaEEyi>20100905>20101023>..."
PANIC: failed to add tuple to page
CONTEXT: COPY customer, line 296:
"296>ALNGAT>alngat>EgBEEAyXVIAWBE>KCiDDFsqA8Kv>2586068>4067234479>ALNGAT(at)kuvkaEEyi>20100905>20101023>..."
psql:./customer.sql:3: connection to server was lost
==============================

If I skip the 3rd step(ALTER TABLE(fillfactor)),
I don't have any ERROR.
And It's also OK on PostgreSQL 9.1.3.

Are there any changes about this behavior ?