BUG #2168: 45.000.000 records too much?

The following bug has been logged online:

Bug reference:      2168
Logged by:          Steven Mooij
Email address:      steven@mooij.name
PostgreSQL version: 8.1
Operating system:   Linux
Description:        45.000.000 records too much?
Details:

Tried to copy the result of a join into another table, about 45.000.000
(small) records. This is the result:

testsearch=> insert into t_documentword2 (SELECT document_id, t_word2.id,
frequency from t_documentword, t_word2 where t_documentword.word =
t_word2.word);
server closed the connection unexpectedly
       This probably means the server terminated abnormally
       before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.

I got the same result in version 7.5.15.