PH01094: CREATE TERMINAL DEADLOCK : ENQUEUE KCSTRING AND CCSTWAIT VSMSTRNG

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS is at MXT. Tasks are suspended on resource ENQUEUE KCSTRING
  and CCSTWAIT VSMSTRNG. One of the tasks suspended on the string
  wait (VSMSTRNG) is the owner of the ENQUEUE KCSTRING
  "DFHTOR:tt:mm". The strings are held by tasks waiting for the
  Enqueue. Therefore, we have a deadlock. This is a timing
  problem, very similar to APAR PK18930 but in this case the EXEC
  CREATE TERMINAL is for non-pooled terminals.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Tasks are suspended on ENQUEUE KCSTRING *
  *                      "DFHTOR:tt:mm" and some are waiting     *
  *                      CCSTWAIT VSMSTRNG.  The owner of the    *
  *                      ENQUEUE is suspended on the string wait *
  *                      (VSMSTRNG) but the strings are all held *
  *                      by tasks waiting for the same enqueue.  *
  *                      These tasks are deadlocked.             *
  ****************************************************************
  A task which holds an exclusive ENQ on STRING 'DFHTOR:tt:mm' is
  waiting for a VSAM thread but all those VSAM threads are held by
  tasks that are queued waiting to ENQ on STRING 'DFHTOR:tt:mm'.
  Each task is running an EXEC CICS CREATE TERMINAL command for
  non-pooled terminals.
  

Problem conclusion

• DFHAMPIL has been changed to isolate EXEC CICS CREATE TERMINAL
  commands by issuing a further enqueue "CREATE_TERMINAL".
  

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:

  UI61536 UI61537 UI61540

Modules/Macros

• DFHAMPIL
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R000 PSY UI61536

     UP19/02/28 P F902

• R100 PSY UI61537

     UP19/02/28 P F902

• R200 PSY UI61540

     UP19/02/28 P F902

Fix is available

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