PH17172: IBM MQ V800 ABEND0C4 READING LOG RECORDS BACKWARDS SMALL WINDOW

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Additional Symptom(s) Search Keyword(s):
  IBM MQ V800  We can see that this abend is a good match for an
  internal defect with identical symptoms that we've
  fixed very recently. The problem happens during abort
  processing when reading log records backwards and is a small
  timing windows where we clear our log properties block prior to
  resetting the LCIDLRBA field.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 8       *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: S0C4-00000004 abend has been reported   *
  *                      in CSQJL002.CSQJR103.                   *
  ****************************************************************
  If a unit of work is aborted during a specific window of the log
  write code then a 0C4 abend can be produced as part of reading
  the log backwards.
  

Problem conclusion

• The window in the log write code has been removed preventing
  this specific 0C4 from occurring.
  

Temporary fix

Comments

APAR Information

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

  PI98859

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

  UI65658

Modules/Macros

• CSQJR103 CSQJW001 CSQJWE01
  

Fix information

• Fixed component name

  IBM MQ Z/OS V8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI65658

     UP19/10/29 P F910 ¢

Fix is available

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