Port Bug Report: connection to the backend is lost while using a rule

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Marek Mintal
Your email address : mintal(at)alert(dot)sk

Category : runtime: back-end: SQL
Severity : serious

Summary: connection to the backend is lost while using a rule

System Configuration
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Operating System : linux 2.0.36 ELF

PostgreSQL version : 6.4.2, 6.5

Compiler used : gcc 2.7.2.3

Hardware:
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Linux main.ews.sk 2.0.36 #7 Mon Apr 26 15:25:25 CEST 1999 i686 unknown

Versions of other tools:
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gmake 3.76.1
flex 2.5.4

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Problem Description:
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example:create table c (inout int4);
create table l (totalin int4, totalout int4);
insert into l values(0,0);

create rule c_in as on insert to c where new.inout > 0 do instead update l set totalin=new.inout;
insert into c values(1);
insert into c values(-1);

result:

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Test Case:
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pqReadData() -- backend closed the channel unexpectedly.

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Solution:
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