PM27233: ABEND 0C4 INTO DFHIIRP

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Error message
  DFHII1012 E CICST5 Failure com.ibm.cics.domains.DomainDisaster:
            Class: Dfhiirpj,
            function: RECEIVE_REPLY, response: DISASTER,
            reason: ABEND receiving reply from IIRP.
  is issued and an abend 0c4 is detected into DFHIIRP at offset
  x'2294' base lvl.
  The root cause is that the initial RUEI in the list addressed by
  rp_frag_ruei_ptr is held in the stack storage of DFHIIRP.
  When DFHIIRP returns with EXCEPTION and BUFFER_TOO_SMALL the
  stack storage is available for any other task touse.
  Normally this task will be back in to DFHIIRP immediately with a
  bigger buffer and so will be allocated the same stack storage.
  This allows the chain of fragment buffers and rueis to be
  processed and freed.
  The problem occurs when the original task looses control
  after returning from DFHIIRP and does not run again for some
  time. In this gap another task runs and obtain the stack storage
  At this point the original task gets a different area of stack
  storage than it had last time, refering to storage unavailable
  causing the 0c4 .
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0C4 at offset x'2294' in DFHIIRP   *
  *                      and message DFHII1012 is issued when    *
  *                      receiving a fragmented IIOP reply.      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  DFHIIRP function INVOKE has been called to send an IIOP request
  to a remote system and receive the reply.  The reply being sent
  by the remote system is large and so has been broken up into
  fragments.  DFHIIRP receives the series of fragments, storing
  them in a chain a RUEI control blocks and associated data
  buffers.  This chain of RUEI control blocks is referenced from
  an initial RUEI held in DFHIIRPs local stack storage.  The
  address of the initial RUEI is held in the global rp_data block
  in field rp_frag_ruei_ptr.
  
  Once all the data has been received the length is calculated
  and found to be larger than the size of the buffer supplied to
  DFHIIRP.  DFHIIRP returns to its caller with a response of
  BUFFER_TOO_SMALL.  The caller obtains a buffer of the correct
  size and calls DFHIIRP function RECEIVE_REPLY specifying
  a RESPONSE_TYPE of OVERFLOW.
  
  At some point between returning from DFHIIRP and calling it
  again, a task on a different TCB makes a domain call that gets
  allocated the stack storage that was just in use by DFHIIRP.
  That domain call causes the storage that was previously the
  initial RUEI to be overwritten.
  
  DFHIIRP gets running again with a new area of stack storage.
  It attempts to process the RUEI chain, starting at the initial
  RUEI whose address was obtained from the global rp_data block.
  That storage is no longer a RUEI so an 0C4 abend occurs when
  the RUEI chain gets processed and an invalid address is used
  as a pointer to a RUEI or data buffer.
  
  Additional Keywords: msgDFHII1012
  ABENDS0C4  S0C4  CORBA  CORBASERVER  EJB  EJBS
  

Problem conclusion

• DFHIIRP has been changed so that the initial RUEI is held in
  GETMAINed storage instead of local stack storage.  This allows
  it to persist validly across calls to DFHIIRP.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

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

  UK65157

Modules/Macros

•    DESIIRP  DFHIIRP
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK65157

     UP11/03/03 P F103

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.