PM08448: BAD MRCB OR MBCB ADDRESS. ABEND0C4 IN DFHTDB OR DFHTDRM . MRCABCN1 HOLDS A BAD MRCB ADDRESS .

APAR status

• Closed as fixed if next.

Error description

• Various errors relating to bad MRCB or MBCB control blocks.
  MRCBPTR or MBCBPTR is bad in the stacks of either DFHTDB or
  DFHTDRM .
     Symptoms include:
  DFHTD0001 reporting abend0C4 in DFHTDB ( at base level )
  at offset 58C6 because a bad rpl_p because of a bad
  MRCB_RPL_P because of a bad MRCB .
  .
  Abend0C4 in DFHTDRM ( at level UK44630 ) at offset 53C6 in
  routing BCBCHN because of a bad MBCB .
  .
  Abend0C4 in DFHTDRM at offset 3BE .
  .
  These problem happen if the aftermath of an abend within
  DFHTDRM which drives TDRM's recovery routing TDRMREC .  There
  can be an abend0C4 within control of TDRMREC because MRCBPTR
  and MBCBPTR weren't initially cleared and can therefore contain
  residual values .
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: MRCABCN1 chain gets corrupted if        *
  *                      EXEC CICS SYNCPOINT is issued with an   *
  *                      invalid TDRM work token.                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If DFHTDRM is called due to an EXEC CICS SYNCPOINT call with an
  invalid TDRM work token then TDRM may program check. This
  will lead to TDRMREC being called and may result in residual
  data being placed on the unallocated MRCB and MBCB chains.
  
  Additional Keywords: MRCAFCN1 MRCBBCHN MRCBFCHN MBCAFCN2
                       MBCAFCN2 MBCABCN2 MBCAFCN1 MBCABCN1
                       MBCBFCHN MBCBBCHN
  

Problem conclusion

Temporary fix

Comments

• This APAR is being closed FIN with concurrence from the
  submitting customer.  This means that a fix to this APAR is
  expected to be delivered from IBM in a release which is being
  developed at the time that the APAR was closed.
  The latest release of the product to exit development at the
  time this APAR was closed was:
    CICS Transaction Server for z/OS V4.1.
  PEG12244  PEG 12244
  

APAR Information

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

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

Fix information

Applicable component levels

• RZ66 PSN

     UP

• R500 PSN

     UP