PH63380: FORWARD FIT OF QCF V320 APARS: PH61498 AND PH62015

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The following fixes are carried forward from QCF 3.2:
  1) ABEND0C4 when the notify exit is called by CSLSSR20 during
     QCF Server shutdown (PH61498).
  2) QCF Unload causes ABEND0790 RC=03 in IMS when deleting a
     TRANS message for a conversational transaction from the queue
     (PH62015).
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All IBM IMS Queue Control Facility for z/OS                  *
  * 4.1 (FMID=H0GN410) users.                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * The following fixes are carried forward                      *
  * from QCF 3.2:                                                *
  * 1) When shutting down the SCI address                        *
  *    space and then shutting down the QCF                      *
  *    Server, an ABENDS0C4 may occur in the                     *
  *    Notify Exit module called by CSLSSR20                     *
  *    if multiple QCF servers that belong                       *
  *    to the same PLEX are shut down at the                     *
  *    same time (PH61498).                                      *
  *                                                              *
  * 2) ABENDU0790 occurs at DFSUSE00 when                        *
  *    QCF Unload is deleting a transaction                      *
  *    message for a conversational                              *
  *    transaction from the queue (PH62015).                     *
  *    In addition to IMS coming down with                       *
  *    ABENDU0790 RC03, QCF batch receives                       *
  *    error IQC4065T.                                           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply the maintenance for this APAR.                         *
  ****************************************************************
  1) If the SCI address space has already been stopped, when the
     Notify Exit receives a notification from the QCF Server on
     another node during the QCF server shutdown process, it may
     reference an area that has already been freed. This results i
     an abend with S0C4.
     At this time, one of the following messages is shown:
     CSL3110E MEMBER qcf_sever_name EXIT SRB ABEND S0C4 PSW=psw
     RSN=00000011 CSLSSR20=module_address EXIT=exit_address IN EXI
     or
     CSL3110E MEMBER qcf_sever_name EXIT SRB ABEND S0C4 PSW=psw
     RSN=00000010 CSLSSR20=module_address EXIT=exit_address IN EXI
     or
     CSL3110E MEMBER qcf_sever_name EXIT SRB ABEND S0C4 PSW=psw
     RSN=00000004 CSLSSR20=module_address EXIT=exit_address IN EXI
  
     RSN=00000011 is abended at IQCZPLM0 + x'0424'
     RSN=00000010 is abended at IQCZPLM0 + x'041C'
     RSN=00000004 is abended at IQCZXNF0 + x'030A'
  
  2) QCF Unload calls DFSCONX0 with a parameter indicating it
     already owns INUSE when deleting a conversational transaction
     message.
     Just before QCF Unload calls DFSCONX0, the message destined
     for LTERM (CNT) owns INUSE, the message destined for
     transaction (SMB) does not own INUSE.
     It should be only required for the message destined for
     LTERM (CNT) that owns INSUE, not for the message destined for
     transaction (SMB) that does not own INUSE.
     As a result, message destined for the transaction have an
     inconsistent INUSE state and ABENDU0790 occurs.
  

Problem conclusion

• 1) QCF has been changed to ignore notifications received by the
     Notify Exit during the QCF Server shutdown process.
  
  2) QCF has been changed to call DFSCONX0 with a parameter
     indicating it already owns INUSE only for messages destined
     for LTERM.
  

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:

  UI99011

Modules/Macros

• IQCQMR2F IQCQMR5F IQCXSWRK IQCZXNF0
  

Fix information

• Fixed component name

  IMS QUEUE CNTL

• Fixed component ID

  5697E9900

Applicable component levels

• R410 PSY UI99011

     UP24/11/16 P F411

Fix is available

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