PH39901: DFHTR0112 BAD DATA PASSED FOR TRACING TO MODULE DFHTRPT WHEN PROCESSING LARGE CHUNKS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The stack for DFHWBCL shows that the chunk length we are
  attempting to receive is very large.  A HTTP chunk has to end
  in CRLF and this is not found by CICS.
  
  The missing CRLF causes diagnostics to be gathered and trace
  attempts to print out the full chunk.  Dependent on the chunk
  size and storage it may or may not hit an area of storage that
  is not allowed to be accessed which will result in an 0C4 in
  DFHTRPX.
  
  Trace entries like the following can be seen when the problem
  occurs:
  
  S8008 WB 074B WBCL  *EXC* INVALID_CHUNK
  
  S8008 TR 0102 TRPT  *EXC* INVALID-DATA-PASSED   : CALLING
  DOMAIN WAS WB : PARAMETER LIST WAS TRACE_PUT,74B
  
  Additional Symptoms and Keywords:
  KIXREVRJL
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHTR0112 reporting bad data being      *
  *                      passed to DFHTRPT                       *
  ****************************************************************
  When CICS processes an invalid chunk we write out trace point
  074B in DFHWBCL and this loops attempting to print out
  everything from the chunk.
  
  If DFHWBCL believes the chunk size is very large CICS will
  continue to print out 4000 bytes of the chunk until it hits
  the end. This could lead to attempts to print inaccessible
  storage.
  

Problem conclusion

• DFHWBCL has been updated to check if the chunk is invalid and
  if so it will only trace out the first 4000 bytes of the chunk.
  CICS will also print out the size of overall chunk.
  

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:

  UI78672 UI78673

Modules/Macros

• DFHWBCL  DFHWBTRI
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R200 PSY UI78673

     UP21/12/22 P F112

• R300 PSY UI78672

     UP21/12/22 P F112

Fix is available

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