BUG #2510: ERROR: out of memory DETAIL: Failed on request of size 825242672.

The following bug has been logged online:

Bug reference: 2510
Logged by: alex tsai
Email address: alex_tsai(at)pisem(dot)net
PostgreSQL version: 8.1.4
Operating system: FreeBSD 6.1 stable
Description: ERROR: out of memory DETAIL: Failed on request of size
825242672.
Details:

I'm having a trouble trying to insert a tuple.
I'm getting this kind of error "ERROR: out of memory DETAIL: Failed on
request of size 825242672".
What could it be?
the table i'm working with has already 4629138 tuples.
When i terminate my program and start it again everything work fine for
another couple of minutes and then i'm get the same error.

CONTEXT: SQL statement "INSERT INTO billing.calls(id_ats, btime, etime, tt,
ts, indexa, phonea, indexb, phoneb, cc, value, restart) VALUES ( $1 , $2 ,
$3 , $4 , $5 , $6 , $7 , $8 , $9 , $10 , $11 , $12 )"

Sincerely, Alex Tsai.