PK90624: DFHRM0120 RESYNC FAIL AND DFHZC2116 DUMP FOR THE LOCALLY COMMITTED UOWS FOR LU61 TASKS.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After SYSTEM reset of zOS or cancel of CICS region which use
  LU61 connection, CICS was started EMERGENCY. On the restart of
  CICS, DFHRM0120 RESYNCHRONIZATION INFORMATION FROM THE REMOTE
  SYSTEM NOT SUFFICIENT TO DETERMINE THE OUTCOME OF THE UNIT OF
  WORK and DFHZC2116E RESYNCHRONIZATION FAILED dump was issued.
  The UOW looks already committed before the system rest ( or
  cancel of CICS). CICS write a Commit log with FORCE(YES) but
  write a LINKDELE log FORCE(NO).
  It looks CICS region was lost the (unforced) forget log records
  if CICS canceled before the records were hardened to DFHLOG.
  The UOW should be forget at next restar of CICS. In stead of it,
  CICS try to recover the UOW and get DFHRM0120 and DFHZC2116.
  

Local fix

• CICS need to be restart with START=INITIAL to remove the UOW.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHZC2116 issued after a DFHRM0120      *
  *                      following a resync across an LU61       *
  *                      connection.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  CICS was connected to IMS via LU61. A task in CICS had started a
  task in IMS and committed. LU61 required that IMS be the Last
  Agent, so it was told to commit by CICS. It did so, and
  instructed CICS to commit in response. CICS locally committed
  the UOW, then told IMS to forget its own recovery information
  for the distributed unit of work. CICS marked the rmlk for
  deletion, and logged the fact by writing an unforced LINKDELE
  record to the system log. The CICS system then terminated before
  this log record was hardened to the logstream. When CICS was
  emergency restarted, the absence of the LINKDELE record meant
  that the rmlk and its UOW were rebuilt by Recovery Manager. The
  LU61 connection was reestablished, and a resync with IMS took
  place. As part of recovery processing, DFHZNAC issued an
  initiate_recovery call to Recovery Manager. This returned the
  fact that the UOW in question was unknown to IMS. It is correct
  that the UOW was unknown, since CICS had previously told IMS to
  forget about it on the earlier run. CICS issued DFHRM0120 to
  record the fact that the resync was unable to determine the
  outcome of the UOW. It then issued DFHZC2116, which resulted in
  an accompanying system dump. Following this, DFHZNAC issued a
  terminate_recovery call and the UOW and link were removed by
  Recovery Manager.
    The customer felt that this diagnostic information was
  unnecessary in this case, since the resolution of the UOW was
  able to be inferred by CICS.
  Keywords: msgdfhrm0120 msgdfhzc2116 rm0120 zc2116 0120 2116
  

Problem conclusion

• DFHZNAC has been changed to avoid issuing the DFHZC2116 message
  if the initiate_recovery call returns the fact that the link's
  UOW is locally committed.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK82476

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

  UK49123

Modules/Macros

• DFHZNAC  DFHZNCA
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK49123

     UP09/08/15 P F908

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.