unexpected message type 0x58 during COPY from stdin

Hello,

I'm getting a strange error during reload of one of our databases. For the
past several weeks, we have been seeing the following error regularly, but
not necessarily with the same table. The pg_restore aborts after this error,
resulting in an incomplete reload. At first I thought it might be related to
our upgrade to 8.4.4 several weeks ago so we downgraded to 8.4.2, but the
error still occurs. Interestingly, if I run the restore command manually
(from the command line), it works fine -- only in cron does it fail.

uname -a
Linux ike.nbinternal.com 2.6.18-164.6.1.el5 #1 SMP Tue Nov 3 16:12:36 EST
2009 x86_64 x86_64 x86_64 GNU/Linux

version()
PostgreSQL 8.4.2 on x86_64-redhat-linux-gnu, compiled by GCC gcc (GCC) 4.1.2
20071124 (Red Hat 4.1.2-42), 64-bit

-- dump file is created with:
pg_dump --format=custom $DATABASE $EXCLUDE_TABLES >
~/backups/daily-backup.dump

-- restore command:

pg_restore -d nbaffnet -F c -j 4 -v -C --no-data-for-failed-tables
/var/lib/pgsql/daily-backup.dump

-- error:
2010-08-25 04:16:46 PDT [2401]: [1-1] (user=postgres) ERROR: unexpected
message type 0x58 during COPY from stdin
2010-08-25 04:16:46 PDT [2401]: [2-1] (user=postgres) CONTEXT: COPY
afffraud, line 1
2010-08-25 04:16:46 PDT [2401]: [3-1] (user=postgres) STATEMENT: COPY
afffraud (id, idaff, maxkey, maxvalue) FROM stdin;
2010-08-25 04:16:46 PDT [2401]: [4-1] (user=postgres) LOG: could not send
data to client: Broken pipe
2010-08-25 04:16:46 PDT [2401]: [5-1] (user=postgres) STATEMENT: COPY
afffraud (id, idaff, maxkey, maxvalue) FROM stdin;
2010-08-25 04:16:46 PDT [2401]: [6-1] (user=postgres) LOG: unexpected EOF
on client connection

Note: we have been doing these backups and restores for at least a year and
a half without any problems, and we can't think of anything that might have
changed.

Cheers,

Bricklen