IEFUSI problems ZOS 2.3 -- CAIMB8G8 routine

Products

• COMMON SERVICES FOR Z/OS
• 90S SERVICES
• DATABASE MANAGEMENT SOLUTIONS FOR DB2 FOR Z/OS
• COMMON PRODUCT SERVICES COMPONENT
• Common Services
• Datacom/AD
• CA ECOMETER SERVER COMPONENT FOC
• Easytrieve Report Generator for Common Services
• INFOCAI MAINTENANCE
• IPC
• UNICENTER JCLCHECK COMMON COMPONENT
• Mainframe VM Product Manager
• CHORUS SOFTWARE MANAGER
• CA ON DEMAND PORTAL
• CA Service Desk Manager - Unified Self Service
• PAM CLIENT FOR LINUX ON MAINFRAME
• MAINFRAME CONNECTOR FOR LINUX ON MAINFRAME
• GRAPHICAL MANAGEMENT INTERFACE
• WEB ADMINISTRATOR FOR TOP SECRET
• Xpertware
• Compress Data Compression for MVS
• Compress Data Compression for Fujitsu

Issue/Introduction

IEFUSI MEMLIMIT and REGION problems in ZOS 2.3 Works fine in ZOS 2.1

Problem is happening with CICS regions only. All CICS regions are started with SRDR which uses SASSJBCY which is an ACF2 program and when we try to use IEBGENER we get security problems.

We have a ticket open with IBM.them They determined CA's CAIMB8G8 routine was involved,  and suggested we contact you. 

Environment

z/OS

Cause

 User defined IEFUSI exit

Resolution

IBM identified a problem with customer's IEFUSI exit.

At exit it was causing an S0C4 abend that was affecting the chain of flow and affected what was passed back.

The instruction to set R15 with x'F0' was after the LM stmt that reloaded the saved registers and took away R12's addressability. The X'F0' still needed R12 so it caused S0C4 abend. This code has worked for years and years.

Customer flip flopped their code and so far so good.

L R15,=F'0' SET RETURN CODE TO ZERO
LM R14,R12,12(R13) RESTORE REGISTERS