From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: s.shinderuk@postgrespro.ru
Subject: BUG #17706: ALTER TYPE leads to crash
Date: Wed, 07 Dec 2022 20:16:30 +0000
Message-ID: <17706-fa10a46c1ac9ce5a@postgresql.org> (raw)
The following bug has been logged on the website:
Bug reference: 17706
Logged by: Sergey Shinderuk
Email address: s.shinderuk@postgrespro.ru
PostgreSQL version: 15.1
Operating system: Ubuntu 22.04
Description:
With PL/pgSQL:
create type foo as (a int, b int);
create function bar() returns record as $$
declare
r foo := row(123, 2^30);
begin
alter type foo alter attribute b type text;
return r;
end;
$$ language plpgsql;
postgres=# select bar();
server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
LOG: server process (PID 394076) was terminated by signal 11: Segmentation
fault
(Here 2^30 is interpreted as a string length.)
With a cursor:
postgres=# create type foo as (a int, b int);
CREATE TYPE
postgres=# begin;
BEGIN
postgres=*# declare c cursor for select (i, 2^30)::foo from
generate_series(1,10) i;
DECLARE CURSOR
postgres=*# fetch c;
row
----------------
(1,1073741824)
(1 row)
postgres=*# fetch c;
row
----------------
(2,1073741824)
(1 row)
postgres=*# alter type foo alter attribute b type text;
ALTER TYPE
postgres=*# fetch c;
server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
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To: pgsql-bugs@postgresql.org
Cc: noreply@postgresql.org, pgsql-bugs@lists.postgresql.org, s.shinderuk@postgrespro.ru
Subject: Re: BUG #17706: ALTER TYPE leads to crash
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