PK62307: DFHRZ0001 ABEND0C4 AKEA IN DFHRZSO AT +X'4EEE'

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DFHRZ0001 An abend (code 0C4/AKEA) has occurred at offset
  X'4EEE' in module DFHRZSO on an EXecute instruction.
  Register 1 is corrupt, it contains 7FFFF000, because it
  was obtained from using a value from low core.
  This problem ocurrs when attempting to run Web services.
  Backing up in the CICS Trace, you will see the following
  exception trace:
  RZ 0112 RZSO  *EXC* Recovery_entered    RECEIVE_REPLY,20BECF78
                    , 00000000 , 000000A4,01005F07 , 00000000,A4
  Additional keyword(s):
  KIXREVSCB
  ABEND0C4 0C4 RZ0001 request stream requeststream MVC
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHRZ0001 An abend (code 0C4/AKEA) has  *
  *                      occurred at offset X'4EEE' in module    *
  *                      DFHRZSO.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  CICS is processing a webservice request. A handler program
  requests that the webservice be run under a different
  transaction ID.
  Requeststreams are used to start the second task and coordinate
  the webservice request and response between the two tasks. The
  target task executes the webservice and starts to send the reply
  to the source task.
  The target task resumes the source task. The target task should
  suspend at this point and wait for the source task to start
  receiving the reply. Instead of suspending the target task
  continues running and terminates which alters the state of the
  requeststream transport from INBOUND to UNATTACHED. When the
  source task gets going, the unexpected state of the
  requeststream transport causes the wrong codepath to be taken by
  the source task. This leads to an ABEND0C4 in DFHRZSO because
  lowcore is used to address a RUEI control block.
  .
  The failure to suspend is due to an incorrect r_suscnt field in
  the target task's requeststream block. This is set at 2 as the
  target task starts to send its reply. It should be 1 at this
  point.
  The value is 2 due to a timing clash which occurred during
  transaction initialization of the target task. DFHRZXM
  BIND_XM_CLIENT for the target task ran in parallel with DFHRZSO
  SEND_REQUEST LAST(YES) by the source task.
  The source task invoked requeststream resume logic against the
  target task because the is_ready flag had been set by the
  target. The source task assumed that the target had suspended.
  However, the target only suspends if the is_buffing flag is on
  just after it has set the is_ready flag.
  The source task has just reset the is_buffing flag so the target
  task never suspends. This failure to correctly coordinate
  requeststream SUSPEND/RESUME logic leaves the r_suscnt set to
  2.
  
  ADDITIONAL KEYWORDS :- 0C4 S0C4 ABENDS0C4 RZ0001 MSGDFHRZ0001
                         RZRSTRAN
  

Problem conclusion

• Requeststream routines rzis_post_xm_bind and
  rzis_buffered_last_send have been changed so that compare
  and swap logic is used in the setting of the flags
  in the shared control block to correctly coordinate
  SUSPEND/RESUME logic between tasks.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

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

  UK36107 UK36108

Modules/Macros

•    DESRZIS  DESRZST  DESRZXM  DFHRZISC DFHRZIX
  DFHRZSO  DFHRZSOA DFHRZSOJ DFHRZSOM DFHRZSOT DFHRZSOV DFHRZSO1
  DFHRZTA  DFHRZTAA DFHRZTAM DFHRZTAT DFHRZXM
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK36107

     UP08/05/07 P F805

• R500 PSY UK36108

     UP08/05/07 P F805

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.