Backend message type 0x44 arrived while idle

WHile testing 6.5 cvs to see what's the progress with capability
of Postgres to work with big joins I get following error messages:

select a.a,at1.a as t1,at2.a as t2,at3.a as t3,at4.a as t4,at5.a as t5,a
t6.a as t6,at7.a as t7,at8.a as t8,at9.a as t9,at10.a as t10
from t0 a ,t1 at1,t2 at2,t3 at3,t4 at4,t5 at5,t6 at6,t7 at7,t8 at8,t9 at9,
t10 at10 where at1.a_id = a.a_id and at2.a_id=a.a_id and at3.a_id=a.a_id and
at4.a_id=a.a_id and at5.a_id=a.a_id and at6.a_id=a.a_id and at7.a_id=a.a_id
and at8.a_id=a.a_id and at9.a_id=a.a_id and at10.a_id=a.a_id ;

Backend message type 0x44 arrived while idle
Backend message type 0x44 arrived while idle
We have lost the connection to the backend, so further processing is impossible. Terminating.

Postgres+psql eaten all the memory+swap.
Are these messages ok in such a situation ?

Oleg

PS.

Postgres still can't serve large joins :-(

_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83