pqReadData() -- backend closed the channel unexpectedly

Christian HUGUES (chugues@malarde.pf) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
pqReadData() -- backend closed the channel unexpectedly

Long Description
I've installed the PostgreSQL 7.0.3 on a RedHat 6.1, everything was well during installation. When I want to create a temporary table (with the any user account), I've got an error on the backend.

"pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormallu before or while processing the request."

I've tried with the Postgres 6.5.3 and everything is good !!! I don't have this error.
Why this error on the Postgres 7.0.3 ? 

Sample Code
create temporary table test () inherits (test);

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