PH19162: DFHRZ0001 AN ABEND (CODE 0C4/AKEA) HAS OCCURRED AT OFFSET X'3096' IN MODULE DFHRZLN

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This is caused by a timing issue between a PIPELINE task and
  the CSNC task.
  
  The PIPELINE task was attached to process an inbound webservice
  request then gets routed to a partner CICS region. This routing
  is done using CICS requeststreams and creates a requeststream
  object and a requeststream transport object. This task then
  waits on a requeststream suspend token. The partner region
  responds and the CSNC task calls requeststreams module DFHRZLN
  for function AP_NOTIFY. This resumes the waiting PIPELINE TASK.
  
  CSNC now attempts to freemain the requeststream notify block
  which gets stuck on the SMLOCK. While the CSNC task is stuck,
  the Pipeline task runs to completion and freemains the
  requeststream object and the requeststream transport object.
  CSNC completes its freemain and tries to reset a flag in in the
  requeststream object that was just freemained. It obtains the
  requeststream address from a requeststream transport block
  field (which was also freemained by this point) which results
  in CSNC program checking when trying to write to low-core
  storage.
  
  
  Additional Symptom(s) Search Keyword(s): KIXREVxxx
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: A web services request abends 0C4/AKEA  *
  *                      in module DFHRZLN with dumpcode RZ0001. *
  ****************************************************************
  A pipeline task processes an inbound webservice request on CICS
  region SYSA.  A context-switch occurs when the pipeline routes a
  transaction to run on another CICS region SYSB.  The routing is
  done using CICS requeststreams under the control of transaction
  CSNC.  The requeststream on SYSA is suspended by CSNC while the
  transaction on SYSB runs.
  
  Once the transaction on SYSB is complete, CSNC resumes the
  requeststream on SYSA which runs to completion.  As part of its
  resume processing CSNC performs some cleanup but it will be
  suspended if it must wait for SMLOCK.
  In this case, when the SMLOCK is free CSNC proceeds but if the
  requeststream has already completed and CSNC uses an invalid
  pointer to the requeststream it results in an S0C4 program check
  in DFHRZLN and abend RZ0001.
  
  Additional Keywords: msgDFHRZ0001
  

Problem conclusion

• DFHRZLN has been changed to resolve the abend0C4 RZ0001.
  

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:

  UI68669 UI68670

Modules/Macros

• DFHRZDM  DFHRZDUF DFHRZIX  DFHRZLN  DFHRZNR2 DFHRZRG2 DFHRZRM
  DFHRZRS1 DFHRZSO  DFHRZSO1 DFHRZTA  DFHRZTCX DFHRZTR1 DFHRZTRI
  DFHRZXM  DFHZIS2
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R100 PSY UI68669

     UP20/04/02 P F004

• R200 PSY UI68670

     UP20/04/02 P F004

Fix is available

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