[Fwd: bug ? get_groname: group 0 not found]

I posted this message in pgsql-novice, but got no answer.
I dare forward it to pgsql-hackers, though I fear it could be a misuse
of that list.

Could you post an answer on novice since I've not subscribed to hackers.
(Too high level for me, I think)

Spirou wrote:

I can't find my classes anymore (cf below ...) !

I send you a few SQL commands, you'll understand what I mean :

---------------------------
INSERT INTO pg_group VALUES ('http_user')
CREATE USER "www-data" IN GROUP http_user;
CREATE USER nobody IN GROUP http_user;

mybase=> select * from pg_group;
groname |grosysid|grolist
---------+--------+-------
http_user| |
(1 row)

mybase=> \z
NOTICE: get_groname: group 0 not found
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally
before or while processing the request.

mybase=> select * from pg_class;
NOTICE: get_groname: group 0 not found
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally
before or while processing the request.
We have lost the connection to the backend, so further processing is
impossible. Terminating.

----------------------------

Perhaps is it worth to mention I had created a first group,
whose name was 'http' then I deleted this one and created
the new one called 'http_user'.

Is it a bug or a bad use ?
Could you tell what you think of it ?

Thanks

--
Spirou