PK09318: ISSUING A VERBX DFHPD640 COMMAND IN IPCS ON A CICS DUMP MAY NOT DETECT A POSSIBLE LOOP CAUSED BY DUPLICATE RECORDS.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A possible loop may occur if duplicate records are processed
  when issuing VERBX DFHPD640 in IPCS on a CICS DUMP.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: IPCS using VERBEXIT DFHPD640 may not    *
  *                      detect possible loops when formatting   *
  *                      system dumps.                           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The Batch utility is being used to process a system dump using
  IPCS with command parameter VERBEXIT DFHPD640 specified and
  operand 'DS=2' or 'DS=3' included.
  When processing Dispatcher records the routine intended to
  identify duplicate TCB addresses in the TCB chain may not do,
  and so could result in IPCS looping.
  During processing of Dispatcher records CREATE_LIST is called to
  obtain storage to hold TCB pointer addresses with the storage
  address being returned in LIST_TOKEN.
  ADD_LIST is then called to add the TCB pointer address using
  LIST_TOKEN as a reference.
  A second CREATE_LIST may be called causing LIST_TOKEN to be
  overwritten with the new storage address. The second list is
  then deleted and its storage is freed.
  If ADD_LIST is called again before the first CREATE_LIST,
  LIST_TOKEN will point to the storage just freed and the TCB
  pointer address will be written to an invalid area of storage.
  Because LIST_TOKEN is being used to hold the storage address
  obtained for the second CREATE_LIST, TCB pointer addresses
  intended for the first CREATE_LIST can be overwritten.
  Therefore, identifying a possible loop caused by duplicate
  addresses may never be detected.
  
  Additional Keywords: DSSTIMER
  

Problem conclusion

• DFHDSDUF has been updated so that the storage obtained to hold
  chain addresses on CREATE_LIST calls will be held in a unique
  LIST_TOKEN variable. This unique LIST_TOKEN will then be used
  on related ADD_LIST and DELETE_LIST calls to ensure storage is
  always used and freed correctly.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK07221

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

  UK05965

Modules/Macros

•    DFHDSDUF
  

Fix information

• Fixed component name

  CICSTS 3.1 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK05965

     UP05/08/09 P F508

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.