PI79556: ABEND U4088-536 DURING PERIODS OF HEAVY AGENT LOGON/LOGOFF ACTIVITY

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During periods of high Agent logon/logoff activity, an ABEND
  U4088-536 can occur in the CIT task.  Analysis of the dump seems
  to indicate that the termination of the same Agent task has been
  processed twice.  This leads to an attempt to release a storage
  resource a second time, triggering the User ABEND during a
  validity test.
  

Local fix

• No local fix is available.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IIDR CDC for z/OS who frequently    *
  *                 log on to and off from the Administration    *
  *                 Agent.                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Frequent logons and logoffs present an  *
  *                      opportunity for a timing condition to   *
  *                      occur between the Agent task and the    *
  *                      Communications task, which may cause an *
  *                      improper reference to released storage. *
  *                      The external symptoms of the following  *
  *                      failure can be unpredictable.           *
  ****************************************************************
  * RECOMMENDATION: APPLY CORRECTIVE SERVICE                     *
  ****************************************************************
  
  Frequent logons and logoffs of the Administration Agent can
  cause various abnormal terminations to occur.
  

Problem conclusion

• Logic has been added to intercept and recover from the abnormal
  termination of the CIT task due to the unexpected loss of an
  Agent task.  Additional diagnostic logic has also been added to
  generate a dump of various tasks that detect an error and try to
  recover from it.
  

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:

  UI48003

Modules/Macros

•    CHCCITPF CHCCITTC CHCDSCPF CHCPAAPF
  

Fix information

• Fixed component name

  INFO SRVR CDC Z

• Fixed component ID

  5655U7600

Applicable component levels

• RA21 PSY UI48003

     UP17/06/29 P F706

Fix is available

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