PK61254: DFHFC0001 - ABEND0C4 DFHFCFR OFFSET X'5214' PTF LEVEL UK19498

Obtain the fix for this APAR.

APAR status

• Closed as unreproducible.

Error description

• This is a problem of freeing FREE_32K_BUFFER after a remote
  abend. This is not the 32k buffer obtained from the buffer
  pool, but is SET storage obtained as user storage.
  pool, but is true set storage obtained as user storage.
  Because the initial read set abended, FRT_DATA_BUFFER was never
  cleared. Reg2 contains this address.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0C4 in DFHFCFR when an application *
  *                      issues a read_set with a handle_abend,  *
  *                      that is activated, followed by a        *
  *                      read_into against a remote file.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  An application issues a read_set to a remote file. This
  request abends on the FOR and is passed back to the AOR
  where it is handled by a handle_abend command. This is
  immediately followed by a read_into request. This request
  also abends and is handled. When the application comes to an
  end during clean up of the task, DFHFCFR abends with an 0C4.
  
  During the read_set some set storage is allocated and is pointed
  at via the FLAB and FRT_DATA_BUFFER off the FRTE. During the
  first abend, the intention is to set FRT_DATA_BUFFER to zero.
  However, the register being used for FRTE addressability has
  been corrupted via the abend. This means FRT_DATA_BUFFER is not
  set to zero, instead the uninitialized pointer to the FRTE leads
  to random storage being cleared with unpredictable results.
  
  During the read_into the set storage is released updating the
  FLAB. When the second abend occurs the same FRT_DATA_BUFFER
  problem occurs.
  
  During the clean up of the task, the FRTE needs to be released
  and so the system also attempts to free the FRT_DATA_BUFFER. As
  the set storage has already been released the system believe
  that the FRT_DATA_BUFFER storage comes from FCPH and program
  checks as it cannot find an index for zero length.
  
  Additional Keywords: DFHFC0001 FC0001 AKEA 56B6 FCFR FCFRREC
                       MSGDFHFC0001 ABENDS0C4 S0C4
  

Problem conclusion

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

• DFHFCFR has been altered so that in the recovery routine,
  FRTE_POINTER is restored before FRT_DATA_BUFFER is used.
  

APAR Information

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

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

  UK35922

Modules/Macros

•    DFHFCFR
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK35922

     UP08/04/30 P F804

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.