PH65422: IMS CTL ABEND S0C4 BECAUSE OF STORAGE OVERLAY WHEN THE 'IMSID-BASED SUFFIX' AND 'SIGNOFF CLEANUP' FUNCTIONS ARE BOTH ENABLED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Using the 'IMSID-based suffix' function can cause an IMS CTL
  abend S0C4 because of storage overlay when the following
  conditions are all met.
  1. 'IMSID-BASED SUFFIX' option is selected for ETOS 'LTERM/USER
  NAMING OPTIONS'
  2. ETOS 'SIGNOFF CLEANUP' function is enabled (it is disabled by
  default)
  3. IMS signon was attempted after using up all registered
  IMSID-based suffixes
  
  This problem does not happen when either 'IMSID-based suffix' or
  'Signoff cleanup' function is not used.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IBM IMS Extended Terminal Option Support *
  *                 for z/OS Version 3 Release 2 (FMID=H1J4320)  *
  *                 users.                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: IMS ETO Support can cause an ABEND S0C4 *
  *                      in IMS CTL region because of storage    *
  *                      overlay when the "IMSID-based suffix"   *
  *                      and "Signoff cleanup" functions are     *
  *                      both enabled on IMS ETO Support.        *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  *                                                              *
  ****************************************************************
  Using the "IMSID-based suffix" function can cause an abend S0C4
  in IMS CTL region because of storage overlay when the following
  conditions are all met.
  1. "IMSID-based suffix" option is selected for "LTERM/USER
     NAMING OPTIONS" of IMS ETO Support
  2. "SIGNOFF CLEANUP" function is enabled (it is disabled by defa
     ult) on IMS ETO Support
  3. IMS signon was attempted after using up all registered
     IMSID-based suffixes
  
  This is due to a logic error in the signon exit routine provided
  by IMS ETO Support. 
  The signon exit called a routine IZTCLNAF for "SIGNOFF CLEANUP"
  processing with invalid parameters when a signon failed due to
  being used up of all IMSID-based suffixes.
  
  In the conclusion, the IZTCLNAF turned on the flag bit beyond
  the page managed by IMS ETO Support (whose eyecatcher is
  "IZTUTBL"), which can cause an abend S0C4 or an unpredictable
  behavior.
  

Problem conclusion

• IZTSGNXF, the ETOS-provided IMS signon exit routine for IMS V15,
  has been changed to work properly in the condition that
  "IMSID-based suffix" and "Signoff cleanup" functions are both
  enabled
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UO03117

Modules/Macros

• IZTSGNXF
  

Fix information

• Fixed component name

  IMS ETO SUPPORT

• Fixed component ID

  5655E1200

Applicable component levels

• R320 PSY UO03117

     UP25/05/10 I 1000

Fix is available

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