PH59481: TIMEOUT PROCESSING AND POST RACE LEAVES TASK IN RESUMED_EARLY STATE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Module DFHDSDS3, CHECK_EXECUTABLES, finds a suspended task with
  its timeout due. Before timeout processing occurs, a POST is
  processed for the same task's ECB. The ECB is unextended and the
  task's state is set to RESUMED EARLY ( RESUMED_EARLY ). After
  this, the purge during timeout processing fails, Reg2 is
  corrupted and no longer points to the DTA, and the task then
  hangs in a RESUMED_EARLY state.
  
  Additional Symptom(s) Search Keyword(s): KIXREVPAD hung hang
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: A CICS transaction was stuck in         *
  *                      RESUMED_EARLY dispatcher status, and    *
  *                      could not be purged, killed, or         *
  *                      otherwise removed without a recycle of  *
  *                      the region.                             *
  ****************************************************************
  A transaction entered a WAIT_MVS on an ECB list address. As
  DFHDSDS3 was about to call DFHDSDS4 for the TERMINATE_WAIT to
  timeout the transaction, a POST came through for the ECB it was
  waiting on. A timing race between the timeout purge and the ECB
  being posted meant that the CICS purge code in DFHDSDS4 saw
  that the ECB was no longer extended. This led to register 2
  being reused in DFHDSDS4, despite code in an earlier procedure
  still expecting it to address the DTA for the transaction. Upon
  return to this higher level of code, an incorrect comparison
  on this bad address meant that the transaction was left in a
  resumed early state.
    Note - A resumed early state is indicated in the DS VERBX by
  an 'R' in the "S  = STATE OF TASK" column of the formatted
  "==DS: TASKS SUMMARY" section.
  

Problem conclusion

• CICS has been changed to address the DTA via another register
  when using DFHDSDS4.
  

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:

  PH59515 UI95916 UI95917

Modules/Macros

• DFHDSDS4
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R200 PSY UI95917

     UP24/03/05 P F403

• R300 PSY UI95916

     UP24/03/05 P F403

Fix is available

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