Horton

Probable memory leak with ECPG and AIX

Guillaume Lelarge <guillaume@lelarge.info>

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From: Guillaume Lelarge <guillaume@lelarge.info>
To: PostgreSQL Developers <pgsql-hackers@postgresql.org>
Cc: "Dr. Michael Meskes" <michael.meskes@credativ.com>
Date: 2021-12-10T14:40:50Z
Lists: pgsql-hackers

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Hello,

Our customer thinks he has found a memory leak on ECPG and AIX.

The code is quite simple. It declares a cursor, opens it, and fetches the
only line available in the table many times. After some time, the client
crashes with a segfault error. According to him, it consumed around 256MB.
What's weird is that it works great on Linux, but crashed on AIX. One
coworker thought it could be the compiler. Our customer used cc, but he
also tried with gcc, and got the same error.

The test case is attached (testcase.pgc is the ECPG code, testcase.sh is
what our customer used to precompile and compile his code). Do you have any
idea why that happens on AIX?

Two queries to create the table and populate it with a single record:

CREATE TABLE foo(
   key integer PRIMARY KEY,
   value character varying(20)
);
INSERT INTO foo values (1, 'one');

Thanks.

Regards.


-- 
Guillaume.

Commits

  1. Fix previous commit's ecpg_clocale for ppc Darwin.

  2. ecpglib: call newlocale() once per process.