PH65991: CICS HOLDS THE TEMPORARY STORAGE DOMAIN LOCK ACROSS AN UNCONDITIONAL GETMAINREQUEST FOR A QAB CONTROL BL

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• In a CICS region that is Short on Storage ( SOS ), a task that
  owns the TSLOCK is waiting for storage.  This causes other tasks
  
  to back-up waiting on the TSLOCK.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: A CICS region is Short on Storage       *
  *                      (SOS). A task that owns the TSLOCK is   *
  *                      waiting for storage.  This causes other *
  *                      tasks to back-up waiting on the TSLOCK. *
  ****************************************************************
  A PUT to recoverable temporary storage causes DFHTSPT to acquire
  the domain TSLOCK. CICS calls DFHTSMB to MATCH the queue name
  then issues a conditional GETMAIN for a QAB. This fails and
  DFHTSMB needs to free the TSLOCK around another call to
  unconditionally GETMAIN a QAB. However, DFHTSMB does not know
  the TSLOCK is held. The unlock is not issued and and we suspend
  for the GETMAIN while still holding the domain TSLOCK.
  Tasks waiting on the TSLOCK become backed-up.
  

Problem conclusion

• DFHTSMB has been changed to add a test for the lock owner.
  

Temporary fix

Comments

APAR Information

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

  PH65955

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

  UO04835

Modules/Macros

• DFHTSMB
  

Fix information

• Fixed component name

  CICS TS Z/OS V6

• Fixed component ID

  5655YA100

Applicable component levels

• R400 PSY UO04835

     UP25/09/19 P F509

Fix is available

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