PK96072: SOS IN ECDSA DUE TO BRGENRAL BFBE CONTROL BLOCKS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The first BFBE on the keep chain
  is not in the correct state to be deleted.
  This causes the whole of the garbage collection process to end.
  None of the other eligible BFBEs get deleted.
  .
  Additional keywords
  short on storage creep leak
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Garbage collection fails to delete      *
  *                      expired BFBEs leading to SOS in ECDSA.  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A LINK3270 BFBE is placed on the keep chain when a bridge
  transaction terminates. This contains a reference to a bridge
  message block which has a bmb_state set to X'01' -
  BMB_ALLOCATED. This is normally a transient state which will
  change to X'02' - BMB_OUTPUT when the waiting LINK3270 driver
  task wakes up and obtains the message. If the LINK3270 driver
  terminates abnormally due to for example an operator purge, the
  bmb_state remains set to BMB_ALLOCATED.
  This BFBE will eventually rise to the top of the timeout queue
  which is processed by DFHBRFM garbage collection.
  Any BFBE with a state of BMB_ALLOCATED is ignored by garbage
  collection. However, instead of skipping over a BFBE with a
  BMB_ALLOCATED state, garbage collection is terminated.
  This means that other BFBEs with the expected state of
  BMB_OUTPUT are never deleted by garbage collection. This leads
  to a build up of storage allocated to the BRGENRAL subpool which
  can lead to a SOS condition.
  
  ADDITIONAL KEYWORDS :- MSGDFHSM0133 DFHSM0133 SM0133
  

Problem conclusion

• DFHBRFM routine garbage_collect has been changed to skip over
  BFBEs with a message block state of BMB_ALLOCATED rather than
  terminating garbage collection when one is encountered.
  

Temporary fix

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

Comments

APAR Information

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

  PK96064

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

  UK50513

Modules/Macros

•    DESBRFM  DFHBRFM
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK50513

     UP09/09/30 P F909

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.