PK98039: EYUCT0105E TRANSPORT SERVICES CONTROL BLOCK SHORTAGE AFTER NUMEROUS TIMEOUT EVENTS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Your CPSM CMAS or MAS receives message
  .
  EYUCT0105E Transport Services control block shortage has
  occurred
  .
  after a number of CPSM timeout events occur.  Under certain
  circumstances, COMMTSBLOCKS may become orphaned.
  .
  .
  Additional Keywords:  KIXREVRBD
  EYUCP0008E Connection Services nonrecoverable error
  terminating due to nonrecoverable error.
  Method:CTMB Point-Id:4 CMPI_XCPT_NOTSPBLK
  Method:CPLT Point-Id:58 LRT_CAMB_FAIL
  Method:CPLT Point-Id:1024 Debug:CMASSHUT
  ACQUIRE_TSPBLK  ACQUIRE_TSPBLK_FAIL
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICSPlex SM V4R1M0 Users                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: -  Message EYUCT0105E may be issued in  *
  *                         a CMAS or MAS, if numerous requests  *
  *                         sent from a CMAS to a MAS time out   *
  *                         while in XMIT state, as a result of  *
  *                         EYURCTSB control blocks being        *
  *                         orphaned due to the time outs.       *
  *                                                              *
  *                         The message will be similar to the   *
  *                         following:                           *
  *                                                              *
  *                          EYUCT0105E  Transport Services      *
  *                                      control block shortage  *
  *                                      has occurred.           *
  *                                                              *
  *                         When this occurs, EYURCTSB control   *
  *                         blocks that are timed out and        *
  *                         orphaned will have the               *
  *                         CTSB_MAL_STATE field set to          *
  *                         CTSB_XMIT.                           *
  *                                                              *
  *                      -  Message EYUCL0122E may be issued in  *
  *                         a CMAS or MAS, if failures occur in  *
  *                         method EYU0CTBT (CTBT) when a        *
  *                         request is shipped from a CMAS to a  *
  *                         MAS, or from a MAS to a CMAS, as a   *
  *                         result of SMTB buffers being         *
  *                         orphaned due to the failures.        *
  *                                                              *
  *                         The message will be similar to the   *
  *                         following:                           *
  *                                                              *
  *                          EYUCL0122E  MAS communications      *
  *                                      buffer shortage has     *
  *                                      been detected.          *
  *                                                              *
  *                         When this occurs, exception traces   *
  *                         will be written by CTBT in the CMAS  *
  *                         and/or the MAS.                      *
  ****************************************************************
  * RECOMMENDATION: After applying the PTF that resolves this    *
  *                 APAR, all CMASes and MASes must be           *
  *                 restarted.  Note that the restarts do not    *
  *                 need to occur at the same time.              *
  ****************************************************************
  -  When a request is sent from a CMAS to a MAS, method EYU0CTBT
     (CTBT) marks the EYURCTSB to be in XMIT state, and then
     performs other processing that will provide the request to
     the MAS.  If the request times out while CTBT is processing
     it, the EYURCTSB control block will be orphaned.  If this
     happens frequently during the run of a CMAS, the EYURCTSB
     control blocks can be exhausted, which will result in the
     EYUCT0105E message.
  
  -  When a request is sent from a CMAS to a MAS or a MAS to a
     CMAS, CTBT acquires an SMTB from the free pool, places the
     parameter list into the SMTB, and then queues it to the
     partner system, where the SMTB will be returned to the free
     pool.  If an error occurs in CTBT such that the request is
     not queued, the SMTB is not returned to the free pool.  If
     this happens frequently during the run of a CMAS, the SMTBs
     can be exhausted, which will result in the EYUCL0122E
     message.
  

Problem conclusion

• -  CTBT has been updated to turn on a flag in the EYURCTSB to
     indicate that the request is in progress when it turns on the
     XMIT flag, and to turn off the in progress flag when it
     resets the XMIT flag to EXEC.  While the in progress flag is
     on, the request is not eligible for time out.
  
  -  CTBT has been updated to return the SMTB to the free pool if
     it is not queued to the partner system.
  

Temporary fix

• *********
              * HIPER *
              *********
  FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK97677

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

  UK52975

Modules/Macros

• EYUQCTBT EYURCTBT EYUTRCOM EYUYCTBT EYUZCTBT
  EYU0CSLT EYU0CTBP EYU0CTBS EYU0CTBT EYU9CMRU EYU9CMR3 EYU9CMR4
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R60M PSY UK52975

     UP10/02/16 P F002

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.