PI95976: CICS S8 TCBS ARE NOT RETURNED TO POOL.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Code in DFHWBCL should close the web session used for the INVOKE
  SERVICE and then issue a CHANGE_MODE off the S8 and back to the
  callers TCB.  That CHANGE_MODE call should specify
  DISASSOCIATE_TCB(YES) to cause the S8 to go back into the TCB
  pool. However, that parameter is not being set correctly.  This
  causes the S8 to remain associated to the task for its lifetime.
  

Local fix

• Increase SIT parm MAXSSLTCBS
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Long running tasks which use use web    *
  *                      services do not free S8 TCBs when they  *
  *                      have finished with them but instead     *
  *                      keep them until the task terminates.    *
  ****************************************************************
  Long running tasks which use web services do not free an S8 TCB
  when they change back to the original TCB.
  It can be seen in CICS trace that the CHANGE_MODE call to
  change back from the S8 TCB to the original TCB does not specify
  DISASSOCIATE_TCB.  The S8 TCB remains associated with the task
  and is not available to the SSL pool until the task terminates.
  This may cause CICS to run out of S8 TCBs in the SSL pool.
  
  In this case, when another task requires an S8 TCB from the SSL
  pool but none are available, the task is suspended for resource
  type 'DISPATCH' and resource name 'SSL_POOL' until an S8 TCB
  become available in the SSL pool.
  

Problem conclusion

• DFHWBCM has been modified to specify DISASSOCIATE_TCB when the
  S8 TCB changes back to the original TCB.
  

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:

  UI58810 UI58811

Modules/Macros

• DFHWBA   DFHWBA1  DFHWBAP  DFHWBAPF DFHWBBLI DFHWBCL  DFHWBDM
  DFHWBDUF DFHWBENV DFHWBPA  DFHWBPW  DFHWBSO  DFHWBSR  DFHWBSV
  DFHWBTRI DFHWBTTA DFHWBXM  DFHWBXN
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R000 PSY UI58810

     UP18/10/09 P F810

• R100 PSY UI58811

     UP18/10/09 P F810

Fix is available

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