PI87529: DFHXM0004 POSSIBLE LOOP IN DFHXMTA AFTER TASK PURGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS region abended after a series of errors that began with a
  purge issued by a CIEP task. The error messages in this
  sequence begin with:
  .
  DFHXM0004  A possible loop has been detected at offset X'FFFF'
   in module DFHXMTA.
  .
  DFHDS0001 An abend (code ---/AKEC) has occurred at
   offset X'272C' in module DFHDSAT.
  .
  DFHXM0002 A severe error (code X'1013') has occurred in module
   DFHXMIQ.
  .
  The errors continued until CICS finally abended.
  .
  The XM0004 dump is taken because the CIEP task has been
  detected as runaway after recursive AXMA errors occurred for
  the task. CICS trace shows DFHXMTA's recovery routine being
  driven over and over while processing a PURGE_INHIBIT_QUERY
  request from DFHDSAT. The AXMA abends are occurring on
  UNLOCK requests with reason LMLM_NOT_LOCK_OWNER.
  .
  Additional Symptom(s) Search Keyword(s): KIXREVxxx
  state_lock_error_code
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHXM0004 followed by other             *
  *                      severe errors following a               *
  *                      task purge.                             *
  ****************************************************************
  * RECOMMENDATION: .                                            *
  ****************************************************************
  Following a purge of a task, CICS goes into a loop in DFHXMTA.
  This produces the following message one or more times:
  +DFHXM0004 applid A possible loop has been detected
      at offset X'FFFF' in module DFHXMTA.
  .
  This may be followed by other messages such as:
  DFHDS0001 APPLID An abend (code ---/AKEC) has occurred
      at offset X'272C' in module DFHDSAT.
  DFHXM0002 APPLID A severe error (code X'1013') has occurred
      in module DFHXMIQ.
  DFHXM0002 APPLID A severe error (code X'100D') has occurred
      in module DFHXMIQ.
  DFHXM0004 APPLID A possible loop has been detected
      at offset X'2A48' in module DFHXMIQ.
  DFHIE0001 APPLID An abend (code ---/AKEC) has occurred
      at offset X'2640' in module DFHIEIE.
  DFHSM0002 APPLID A severe error (code X'0314') has occurred
      in module DFHSMGF.
  +DFHAP0001 APPLID An abend (code 0C4/AKEA) has occurred
      at offset X'0408' in module DFHABAB.
  .
  The errors occur due to an attempt by DFHXMTA to release a
  lock which it does not own. This results in a LMLM_EXCEPTION,
  with reason LMLM_NOT_LOCK_OWNER, which causes the DFHXMTA
  recovery routine to be driven in a loop for code (AXMA).
  .
  Additional Keywords:
  msgDFHDS0001 msgDFHXM0002 msgDFHXM0004 msgDFHIE0001 msgDFHSM0002
  DS0001 XM0002 XM0004 IE0001 SM0002
  

Problem conclusion

• DFHXMTA has been updated to avoid the incorrect call to
  Lock Manager domain.
  

Temporary fix

Comments

APAR Information

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

  PI85926

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

  UI50632

Modules/Macros

• DFHXMAT  DFHXMTA  DFHXMXE
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R100 PSY UI50632

     UP17/10/07 P F710 ¢

Fix is available

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