PH60589: IMS ABENDS U0757-101 IN DFSQBFM0 AFTER U3048

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This abend occurs when DFSFXC40 calls the Queue Manager to ENQ
  a message from the suspend queue but there is no input message
  on the suspend queue so we see the U0757 - SC101 in DFSQBFM0.
  This abend occurs after a U3048 that resulted in the termination
  of the dependent region.  It is during this termination that the
  call is made to the suspend routine.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All IMS V15 TM users of the External Subsystem Attach        *
  * Facility (ESAF).                                             *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * IMS control region abnormally terminates with ABENDU0757-101 *
  * in module DFSQBFM0 following an ABENDU3048 in a MPP region.  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * INSTALL CORRECTIVE SERVICE FOR APAR/PTF                      *
  ****************************************************************
  After issuing a successful TM GU call to obtain an input
  message, an application running in an IMS MPP region issued a
  subsequent TM GU call to commit its inflight work. IMS syncpoint
  committed the inflight work, started a new unit of recovery
  (UOR)for any new work the application may perform, but
  subsequently returned a QC status code to the application
  because no new input messages were available to process.
  
  Upon receiving status code QC, the application chose to issue
  its first external subsystem call, in this case, to Db2. As part
  of this, IMS drove the Create Thread exit in Db2. However, due
  to a required resource being unavailable in Db2, Db2 issued
  MSGDSN501I, and passed back a RC08 response to IMS from its
  Create Thread exit. The receipt of RC08 from the Db2 Create
  Thread exit resulted in IMS setting up to abnormally terminate
  the application with an ABENDU3048.
  
  During the processing for the U3048 abend, the DLRLKREJ flag was
  set to indicate to IMS syncpoint that any in-progress input
  message may need to be placed on the transaction's SUSPEND
  queue. As SUSPEND processing must occur while executing in the
  IMS control region, the code in IMS syncpoint module DFSSYI40
  issued an ISWITCH TO=CTL prior to calling module DFSFXC40.
  However, in this particular case, while performing SUSPEND
  function processing, the logic in module DFSFXC40 failed to
  check that there was no input message in progress, due to the
  status QC, and proceeded to call IMS Queue Manager logic with a
  zero PSTIPQCR input message pointer.
  As a result of the PSTIPQCR=0 parameter being passed, module
  DFSQBFM0 subsequently issued ABENDU0757-101 resulting in the
  abnormal termination of the IMS control region.
  
  
  Additional Keywords: U0757 U757 RC101 RC=101 rc101 RC=08 RC=8
  rc=08 rc=8 RC8 subcode101
  

Problem conclusion

• Code in module DFSFXC40 has been modified to check that the
  contents of field PSTIPQCR are not zero before continuing with
  SUSPEND processing.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UI98353

Modules/Macros

• DFSFXC40
  

Fix information

• Fixed component name

  IMS V15

• Fixed component ID

  5635A0600

Applicable component levels

• R500 PSY UI98353

     UP24/09/12 P F409 ¢

Fix is available

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