PK31859: ABEND AD3K AND AEXZ OCCUR ON TASK PURGE OF DB2 THREADSAFE TRANSA CTIONS 06/11/20 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The customer is running a THREADSAFE program that performs about
  50000 DB2 SELECT requests.  When they purge the transaction an
  abend AD3K occurs followed by some AEXZ abends.  This results in
  the UOWs being stuck waiting in a WAITRMI state.  The AD3K abend
  occurs even if the CICS-DB2 attach is working correctly.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Transaction Server for z/OS V3.1    *
  *                 users with PK21134 applied.                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: A CICS DB2 application suffers abends   *
  *                      AD2Z and AD3F after issuing an EXEC     *
  *                      CICS SYNCPOINT ROLLBACK over a remote   *
  *                      LINK.                                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A CICS DB2 application has issued a DB2 request which suffers
  a DEADLOCK. An EXEC CICS SYNCPOINT ROLLBACK is issued but the
  command fails with an INVREQ / AD2Z because the application
  tried executing a remote LINK without the SYNCONRETURN
  parameter. An ABORT is not attempted because of code added by
  PK21134. A notify to the other side of the LINK results in an
  AZI6 abend. The thread is attempted to be terminated but fails
  because the ABORT was never issued, and the AD3F abend occurs.
  
  Keywords: AbendAD2Z AbendAZI6 AbendAD3F UEFMSYNC
  

Problem conclusion

• UK14394 UK15979 UK16029 UK16633
  DFHERM has been changed to check if the TRUE about to be
  called is DB2s, if it is then do not set abterm_allowed.
  Also for all TRUEs the setting of abterm_allowed has been
  moved to as close to the actual call to the TRUE as
  possible.
  The setting of abterm_allowed to NO at the start of DFHD2EX1
  has been removed as it is no longer required.
  The code added by PK21134 has been removed.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK26061

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

Modules/Macros

•    DESD2D2  DESD2EX1 DFHD2D2  DFHD2EX1 DFHERM
  

Fix information

• Fixed component name

  CICSTS 3.1 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK20286

     UP06/12/09 P F612

Fix is available

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