PH44638: SMCK TRACE CALLS SEEN DESPITE CSATSKCR AND CSATRMCR BITS NOT BEING SET ON IN CSATRMF5 OR CSATRMF6 BYTES.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CSFE can be used to activate DFHTRAP, and also to activate
  task and terminal storage checking. If CSFE DEBUG,TRAP=ON is
  entered, just to run DFHTRAP, then SMCK trace calls are seen
  even though storage checking has not been requested too:
  SM 0901 SMCK  ENTRY - FUNCTION(CHECK_STORAGE) TASK_STORAGE(NO)
  This is because  epic 64250 and more specifically story 71468
  introduced new bits into CSZTRMF5 and CSZTRMF6, and the presence
  of CSATRAP (04 in CSATRMF6) causes the code in ERM, EIP, EIG,
  TRP and ETR to call DFHSMCK when this is not required. The calls
  do little and control returns to the caller. But these calls
  should not be being made if no storage checking is to be
  performed.
  Defect 172417 has been raised to fix this in development. This
  APAR is to backport this serviceability fix to 5.4 and above.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: When a DFHTRAP is enabled through CSFE  *
  *                      DEBUG, SMCK trace calls occur without   *
  *                      storage checking enabled.               *
  ****************************************************************
  When a trap is enabled through CSFE DEBUG, for example: 'CSFE
  DEBUG,TRAP=ON', CICS will make unnecessary SMCK trace calls such
  as:
  SM 0901 SMCK  ENTRY - FUNCTION(CHECK_STORAGE) TASK_STORAGE(NO)
  TP_STORAGE(NO)
  
  These do not cause any harm, but they also do not do anything as
  both storage checking options are off, and so the call should
  not be made.
  

Problem conclusion

• CICS has been updated to prevent these SMCK calls from being
  made when not required.
  

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:

  UI94103 UI94104

Modules/Macros

• DFHEIG   DFHEIP   DFHERM   DFHETR   DFHTRP
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R200 PSY UI94104

     UP23/10/21 P F310

• R300 PSY UI94103

     UP23/10/27 P F310

Fix is available

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