Oracle Listener Failed to start on AIX

Tried to start the Listener on IBM AIX machine and it failed to start and reported the below errors

[oracle@oemhost:oemqa] /network/admin > lsnrctl start
exec(): 0509-036 Cannot load program lsnrctl because of the following errors:
        0509-130 Symbol resolution failed for lsnrctl because:
        0509-136   Symbol CreateIoCompletionPort (number 400) is not exported from
                   dependent module /unix.
        0509-136   Symbol GetMultipleCompletionStatus (number 401) is not exported from
                   dependent module /unix.
        0509-192 Examine .loader section symbols with the
                 'dump -Tv' command.
[oracle@oemhost:oemqa] /network/admin >

Found the issue as published notes in Oracle Support notes

AIX:12c & above ,Installation/dbua/dbca/sqlplus/lsnrctl/netca Fails with “rtld: 0712-001 Symbol CreateIoCompletionPort was referenced “,’0509-130′,’0509-036′ (Doc ID 1949184.1)

To fix this issue, ask Linux administrator to fix this since it requires the root access. Instructions to Linux Administrator are below.

# smitty iocp
  Change / Show Characteristics of I/O Completion Ports
  Configure Defined I/O Completion Ports
                                                                           COMMAND STATUS

Command: OK            stdout: yes           stderr: no
Before command completion, additional instructions may appear below.

iocp0 changed
Changes will become effective at next system restart

Verify the IOCP status using below command

$ lsdev | grep iocp
iocp0 Available I/O Completion Ports

Reboot the server and then try to start the listener.

[oracle@oemhost:oemqa] /home/oracle > lsnrctl start

LSNRCTL for IBM/AIX RISC System/6000: Version 12.1.0.2.0 - Production on 05-OCT-2022 05:47:40

Copyright (c) 1991, 2016, Oracle.  All rights reserved.

Starting /opt/oracle/product/12.1.0/dbhome_1/bin/tnslsnr: please wait...

TNSLSNR for IBM/AIX RISC System/6000: Version 12.1.0.2.0 - Production
System parameter file is /opt/oracle/product/12.1.0/dbhome_1/network/admin/listener.ora
Log messages written to /opt/oracle/diag/tnslsnr/oemhost/listener/alert/log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oemhost)(PORT=1528)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oemhost.corpnmg.net)(PORT=1528)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for IBM/AIX RISC System/6000: Version 12.1.0.2.0 - Production
Start Date                05-OCT-2022 05:47:41
Uptime                    0 days 0 hr. 0 min. 1 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /opt/oracle/product/12.1.0/dbhome_1/network/admin/listener.ora
Listener Log File         /opt/oracle/diag/tnslsnr/oemhost/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oemhost)(PORT=1528)))
Services Summary...
Service "oemqa.corpnmg.net" has 1 instance(s).
  Instance "oemqa", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
[oracle@oemhost:oemqa] /home/oracle >

After IOCP settings now the listener started successfully.