PH64338: DFHTR0004 A POSSIBLE LOOP HAS BEEN DETECTED IN MODULE DFHTRPT WHEN ATTEMPTING TO PUT OUT AN IPIC IPCONN TRACE POINT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You are running CICS TS 6.x and have IPCONN or IPIC connections
  that are having some issues.
  You turn CICS internal trace on and attempt to purge a task
  associated with an IPCONN session.
  After this you receive the following message and a dump is
  taken:
  
  DFHTR0004 A possible loop has been detected at offset X'FFFF' in
            module DFHTRPT
  The dump shows DFHEISM attempting to put out trace
  TID_ISEM_CONN_ERROR, x'140B' or decimal trace point 5131,
  but is passing bad information in the parameter list
  causing the trace program to get into a loop.
  
  Additional symptoms: KIXREVRJL
  looping IS CISE transaction
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: A CICS region with an IP connection     *
  *                      suffers an abend dumpcode TR0004        *
  *                      and a message about a possible loop     *
  *                      detected at offset X'FFFF' in module    *
  *                      DFHTRPT.                                *
  ****************************************************************
  Two CICS regions have an IP connection between them.  There is a
  connection failure while a transaction is running, and a loop
  occurs in DFHTRPT when DFHISEM tries to write a trace point ID
  140B trace entry. It fails to write the trace entry.
  
  nnnnn QR   IS 140B ISEM  EVENT CONN_ERROR             SYSB, etc.
  
  DFHTR0004 applid A possible loop has been detected at offset
  X'FFFF' in module DFHTRPT.
  
  DFHME0116 applid  nnn
  (Module:DFHMEME) CICS symptom string for message DFHTR0004 is
  PIDS/5655Y0400 LVLS/720 MS/DFHTR0004 RIDS/DFHTRPT PTFS/UI68711
  DFHDU0201 applid ABOUT TO TAKE SDUMP. DUMPCODE: TR0004
  

Problem conclusion

• The trace call in DFHISEM is changed to clear any possible
  residual data in the trace parameter list.
  

Temporary fix

Comments

APAR Information

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

  PH62230

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

  UI99928 UI99935

Modules/Macros

• DFHISEM
  

Fix information

• Fixed component name

  CICS TS Z/OS V6

• Fixed component ID

  5655YA100

Applicable component levels

• R400 PSY UI99928

     UP25/02/08 P F502

• R500 PSY UI99935

     UP25/02/11 P F502

Fix is available

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