PH26672: ABEND0C4 DFHMNSU OFFSET X'1620' DFHMN0001 20/06/22 PTF PEREMOVE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When CICS is initializing there is a call to see if IBM® z/OS®
  Workload Interaction Correlator which produces DFHMN0001
  ABNED0C4 in DFGMNSU. CICS is starting up, and the domains are
  initializing. Monitor Domain starts initialization and starts
  various activities.
  .
  PA and XM domains drive DFHMNSU which
  calls DFHMNSVC to issue PB_CREATE.
  
  Meanwhile, at some point,
  MN domain wants to find out if ZWIC is needed and drives
  DFHMNSU which calls DFHMNSVC to issue ZWIC_REGISTER.
  
  If the
  DFHMNSU->DFHMNSVC->ZWIC_REGISTER call happens while all of
  those DFHMNSU->DFHMNSVC->PB_CREATE are occurring, then there
  can be a conflict in the use of the MAFPB control block.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS initialisation abends when the     *
  *                      Monitoring Domain tries to initialise   *
  *                      a zWIC (IFAWIC) buffer using a null     *
  *                      pointer.                                *
  ****************************************************************
  CICS initialisation fails with an 0C4 abend in module DFHMNSU
  on an EXECUTE instruction: 4490 6008.
  The error can be reported at offset X'1620' or X'1A8C' in
  DFHMNSU.
  The EX target instruction is an XC: D700 7000 7000.
  The problem is that Register 7 is 00000000_00000000
  causing the XC instruction to fail.
  MN domain has called DFHMNSVC to obtain a zWIC buffer,
  but the call failed, and returned a null pointer.
  Subsequent use of the null pointer caused the 0C4.
  
  Keywords: mna_state_lock
  

Problem conclusion

• DFHMNSU has been changed to serialise calls to DFHMNSVC
  for zWIC buffer allocation.
  

Temporary fix

Comments

APAR Information

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

  PH26133

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

  UI70186

Modules/Macros

• DFHMNDM
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R300 PSY UI70186

     UP20/06/27 P F006

Fix is available

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