PM92511: DFHSM0002 A SEVERE ERROR (CODE X'0D0A') HAS OCCURRED IN MODULE DFHSMMF DUE TO A DOUBLE FREEMAIN AFTER ABENDAZCT.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Following an ABEND AZCT, your CICS region receives DFHSM0002 A
  severe error (code X'0D0A') has occurred in DFHSMMF.
  
   The dump shows an exception trace entry:
  SM 0D0A SMMF  *EXC* - Invalid_TP_storage_address
  -FUNCTION(FREEMAIN)  ADDRESS(52FF09C0) TCTTE_ADDRESS(460E1280)
  STORAGE_CLASS (TERMINAL)
   TASK-TCP   KE_NUM-0025 TCB-QR   /007B2738 RET-C4CD6F66
  
  The TCP task continues to perform sends and receives after the
  AZCT ABEND has been issued.  This results in the invalid
  freemain because the storage has been previously freed.
  Although this problem sounds very similar to PQ37557, this code
  has already been incorporated into the CICS/TS 3.2 base code.
  
  
  Additional Symptom(s) Search Keyword(s): KIXREVRJL
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHSM0002 A severe error (code X'0D0A') *
  *                      has occurred in module DFHSMMF due to a *
  *                      double freemain after ABENDAZCT.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  CICS has been configured with HPO=YES. A CICS application sends
  data on an LU6.1 session to IMS. The CICS send module DFHZSDS
  issues the SEND request to VTAM, specifying DFHZSDX as the
  completion exit to be driven by VTAM when the send completes.
  The send carries the change direction CD indicator as reply data
  is expected, causing DFHZSDS to save the send TIOA address in
  field TCTECDSV and set flag TCTTEOSS to indicate the TIOA was
  saved.
  The system is under stress, with CICS near MAXTASK, and there is
  an unusually long delay before DFHZSDX is driven and the CICS
  TCP task runs to complete its send processing. During this
  delay the task that issued the send times out and starts ABEND
  processing for code AZCT, before becoming suspended sending a
  diagnostic message. While ABEND processing is suspended the send
  completes and the TCP task runs, calling DFHZSDX first and
  then DFHZRVS to issue a receive specific for the expected
  reply data. DFHZRVS tests TCTTEOSS when deciding whether to
  re-use the original send TIOA for the receive, or getmain a new
  one. However TCTTEOSS was reset during ABEND processing, so
  DFHZRVS does not getmain a new TIOA as expected, but re-uses the
  send TIOA.
  The reply data is received driving the receive completion exit
  DFHZRVX which, finding the data to be longer than the TIOA, sets
  the overlength data flag TCTEOLD and schedules DFHZRVS to issue
  a further receive for the remaining data. DFHZRVS, finding
  TCTEOLD set, getmains a new larger TIOA and freemains the
  original send TIOA.
  The remaining data is received, DFHZRVX runs to complete receive
  processing then, finding a saved TIOA address in TCTECDSV,
  schedules a second freemain for the original send TIOA, which
  fails as reported with message DFHSM0002.
  
  Additional keywords: MSGDFHSM0002 DFHWB0125 MSGDFHWB0125
                       TCTETABP
  

Problem conclusion

• CICS has been changed for SENDs on an LU6.1 session when
  HPO=YES. If the SEND completes after the RTIMOUT period has been
  exceeded causing the requesting task to ABEND AZCT, a new
  message DFHZC3403 is issued and the session ended immediately.
  
  The CICS Transaction Server for z/OS version 3.2 Messages and
  Codes manual, GC34-6827-04, will be updated to add the following
  new message after existing message DFHZC3402.
  
  DFHZC3403E
  date time applid termid tranid Invalid SEND after LU6.1
  session RTIMOUT. ((instance) Module name {DFHZSDX})
  
  Explanation: CICS is configured with HPO=YES. A SEND on an
  LU6.1 session completed after the request was terminated
  with an abend AZCT, because of a read timeout condition.
  The terminal control blocks are not in a fit state to allow
  the SEND to be processed.
  
  System action
  The session is closed.
  
  User response
  If CICS has been running at or near MAXTASK consider increasing
  the MAXTASK value.
  
  Module
  DFHZSDX.
  
  XMEOUT Parameters: date, time,applid, termid, tranid, instance,
  {1=DFHZSDX}
  
  Destination
  CSNE
  

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:

  PM98567 PM98568 UI13694

Modules/Macros

•    DFHMEZCC DFHMEZCE DFHMEZCK DFHZARQ  DFHZEQU
  DFHZNAC  DFHZSDX  DFH92511
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R500 PSY UI13694

     UP13/12/28 P F312

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.