Out of memory problem "More detailed"

Logged by: Lutischan Ferenc

Email address: yoursoft ( at ) freemail ( dot ) hu

PostgreSQL version: 7.4.3, 7.4.5

Operating system: Linux: SuSE9.0, SLES9

Description: Out of memory

Details:

Dear Developer Team!

I use the PostgreSQL 7.4.5 on SLES9.0 and PostgreSQL 7.4.3 on SuSE 9.0
(I tested this problem on win32 8.0RC1, but that version is OK).

If you make 'create user' and 'alter group' sql command on existing
users, and make it many times, the server doesn't release the memory.
After 6-7000 calls the server is crashed with an 'out of memory' error.
I think this is not a big bug, but the long time without restaring the
server, may be make an 'out of memory' crash.

-In 7.4.5 the logfile contains: 'out of memory error', and
postmaster.pid file is deleted. There is the end of log file (some
messages in Hungarian):
// -------------------------------
.....
2004-12-03 15:32:08 ERROR: user "m010221852922" already exists
2004-12-03 15:32:20 ERROR: user "m018009780020" already exists
TopMemoryContext: 8192 total in 1 blocks; 7088 free (0 chunks); 1104 used
DynaHash: 8192 total in 1 blocks; 7792 free (0 chunks); 400 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
Postmaster: -1232084992 total in 376 blocks; 918106640 free (12751344
chunks); 2144775664 used
ErrorContext: 8192 total in 1 blocks; 8176 free (4 chunks); 16 used
2004-12-03 15:32:29 FATAL: betelt a memoria <- Comment by Ferenc: 'out
of memory' in English
DETAIL: Failed on request of size 1.
// -------------------------------

-In 7.4.3 the logfile doesn't contain: 'out of memory error', and
postmaster.pid file exists. After deleting the postmaster.pid, and
making a 'pg_ctl start' the psql can't connect to the database, only
after a full reboot.

I made a Java program to demonstrate the problem (CreateUsers.java). You
need to create an 'admin' group before run this program. I tested it
with remotely with lastes JDBC driver (pg74.215.jdbc3.jar):
//-----------------------------------------
import java.sql.*;

public class CreateUsers {
public CreateUsers() {
}
public static void main(String[] args) {
Statement loc_sql = null;
StringBuffer loc_sqlString = null;
Connection loc_db = null;
ResultSet loc_eredmeny = null;
try {
Class.forName("org.postgresql.Driver"); //load the driver
for (int i=0; i<20000; i++) {
loc_db =
DriverManager.getConnection("jdbc:postgresql://127.0.0.1/template1",
"postgres", "password");
loc_sql = loc_db.createStatement();
try {
loc_sqlString = new StringBuffer("CREATE USER ");
loc_sqlString.append( "anybody" );
loc_sqlString.append( " WITH PASSWORD '" );
loc_sqlString.append( "anything" );
loc_sqlString.append( "' NOCREATEDB NOCREATEUSER" );
loc_sql.executeUpdate( loc_sqlString.toString() );
} catch (Exception e2) {
}
try {
loc_sqlString = new StringBuffer("ALTER GROUP ");
loc_sqlString.append( "admin" );
loc_sqlString.append( " ADD USER ");
loc_sqlString.append( "anybody" );
loc_sql.executeUpdate( loc_sqlString.toString() );
} catch(Exception e){ }
loc_db.close();
System.out.println(String.valueOf(i));
}
} catch (Exception e) {
System.out.println(e.toString());
}
} }
//-----------------------------------------

If you have any further questions please mail to me.
Best regards:
Ferenc