PI54159: DFHSM0002 XXXXXXXX A SEVERE ERROR (CODE X'0318') HAS OCCURRED IN MODULE DFHSMGF WHILE BROWSING SHARED TEMPORARY STORAGE QUEUES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An application program is browsing through the shared TS pools
  and shared TS queues in them. while this is running a periodic
  cleanup of shared TS queues by CICS runs under a Timer Domain
  task (TI). Both tasks end up sharing the same SBB control block
  and eventually a freemain fails becasue the control block has
  already been freed
  
  SM 0318 SMGF  *EXC* Freemain_address_overlays_previous_SCF
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All CICS users.                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * DFHSM0002 A severe error (code X'0317') occurred in module   *
  * DFHSMGF.                                                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * .                                                            *
  ****************************************************************
  A temporary storage cleanup task was running. DFHTSCL getmained
  a shared browse block (SBB) to represent its browse of the
  shared temporary storage queues. Before this browse had ended, a
  user task also started a browse of the shared queues. The start
  browse logic found the SBB that DFHTSCL had getmained was not
  associated with a known task number. This was correct as DFHTSCL
  runs under a TI (timer domain) task. The logic
  incorrectly assumed this meant the SBB had been used by an
  earlier task which had ended without explicitly ending its
  browse, so had not freemained its SBB. It freed the SBB and the
  storage was reused as a new SBB for the user task. This meant
  both tasks were now using the same storage for their respective
  SBBs. The user task completed its browse, and the end browse
  logic freemained the SBB. When DFHTSCL finished its own browse,
  it also tried to freemain the SBB. Storage manager detected that
  the freemain length overlaid the next SCF and issued message
  "DFHSM0002 A severe error (code X'0317') has occurred in module
  DFHSMGF." Note - the same invalid freemain may result in a
  severe error code X'0318', depending upon the location of the
  next freed storage area.
  Keywords: msgdfhsm0002 sm0002 sm 0002 tscl
  

Problem conclusion

• DFHTSSH has been changed to avoid freeing an SBB if it was
  associated with a task with no transaction manager token.
  

Temporary fix

Comments

APAR Information

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

  PI46681

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

  UI34770

Modules/Macros

• DFHTSDUF DFHTSDUS DFHTSSH  DFHTSST
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R000 PSY UI34770

     UP16/02/11 P F602

Fix is available

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