PH66730: MULTIPLE ATTEMPTS TO WRITE OUT CICS SECURITY DISCOVERY DATA AFTER DFHXS1605 FAILURE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When CICS is writing security discovery data to the DFHSECD
  journal, it's possible that a write will fail if the amount of
  data is too large for the log stream. This results in a
  DFHXS1605 message (and perhaps a DFHLG0742 message):
  
  DFHLG0742 05/14/2025 04:06:06 xxxxxxxx Log record too long for
  block. Record size 32,450 bytes. Block size 32,000 bytes. MVS
  log stream DFHSECD.STREAM.NAME.
  DFHXS1605 05/14/2025 04:06:06 xxxxxxxx Failed to write the
  Security Discovery Data to the DFHSECD logstream. Reason:
  Journal DFHSECD log stream length error.
  .
  After one write fails, CICS should stop attempting to write out
  the security discovery data. However, there's a section of the
  code where the failure may not be immediately recognized. This
  may result in multiple DFHLG0742 and DFHXS1605 messages.
  
  Additional Keywords: SECD, SECDISCOVERY
  KIXREVACC
  

Local fix

• Increase MAXBUFSIZE within your log stream.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Multiple DFHXS1605 & DFHLG0742 messages *
  *                      occur in the joblog when writing        *
  *                      security discovery data.                *
  ****************************************************************
  When writing security discovery data with a MAXBUFSIZE defined
  in the log stream which is smaller than the size of the data
  attempting to be written, the following messages may occur
  multiple times in the CICS joblog:
  
  DFHLG0742 05/14/2025 04:06:06 xxxxxxxx Log record too long for
  block. Record size 32,450 bytes. Block size 32,000 bytes. MVS
  log stream DFHSECD.STREAM.NAME.
  DFHXS1605 05/14/2025 04:06:06 xxxxxxxx Failed to write the
  Security Discovery Data to the DFHSECD logstream. Reason:
  Journal DFHSECD log stream length error.
  
  This occurs because the log stream data is larger than the
  defined MAXBUFSIZE and so CICS cannot write the data correctly
  into the logstream. As a result, further attempts are
  incorrectly made to attempt to write the security discovery data
  instead of clearing the buffer and stopping further action.
  

Problem conclusion

• CICS has been updated to prevent further DFHLG0742 & DFHXS1605
  messages occurring after an initial failure.
  

Temporary fix

Comments

APAR Information

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

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

  UO03786

Modules/Macros

• DFHXSDC
  

Fix information

• Fixed component name

  CICS TS Z/OS V6

• Fixed component ID

  5655YA100

Applicable component levels

• R500 PSY UO03786

     UP25/06/25 P F506

Fix is available

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