PK30083: A LOOP MAY OCCUR IN DFHPD640 WHEN FORMATTING A SVC DUMP. THESE SYMPTOMS MAY OCCURR FORMATING THE DISPATCHER OR EXCLUDING LINES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Reference returned APAR PK26292.
  Intermittently the CICS dump formatter will loop when the
  dispatcher control blocks have been formatted out in either
  summary form or detail, i.e. 'DS', 'DS=1', or 'DS=3'. The loop
  can occur when excluding lines within the dispatcher report,
  searching within the report, or other activity while viewing
  the report. If a dump is taken of the TSO userid's address
  space, the MVS System trace will show repeated SVC 78s(getmains&
  feemains)from the DFHDUFUT routine within the DFHPD640 module.
  DFHDSDUF is calling DFHDUFUT during the output formatting,
  and it appears that a GETSTORE request is failing.
  The return code is not being propagated back to DSDUF,
  and the operation is retried.
  DFHDSDUF is attempting to access the TCBs in the address space.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: IPCS may loop when formatting           *
  *                      Dispatcher statistics.                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  In the reported problem IPCS was looping when formatting
  Dispatcher statistics.
  
  DFHDSDUF contains code that will format out the statistics for
  each TCB. As part of this processing, it does a DFHDUFM call to
  GET_BLOCK a piece of storage from the dump. However, there is no
  error handling after this call. The call used a bad address in
  SCAN_PTR and the call failed. Rather than exit with an error (as
  happens elsewhere in dump formatting code whenever a bad address
  is encountered), the code looped, retrying the same request.
  
  Keywords: MSGDFHPD0103 DFHPD0103
  

Problem conclusion

• DFHDSDUF has been modified and will now handle the
  aforementioned error situation by exiting the code that is
  formatting the Dispatcher statistics with an error of:
  
  DFHPD0103  DS_TCB address <actual_address> is invalid.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

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

  PK30048 UK18065

Modules/Macros

•    DFHDSDUF
  

Fix information

• Fixed component name

  CICSTS 3.1 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK18065

     UP06/09/20 P F609

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.