PH27025: MSGCEE0802C HEAP DAMAGE DURING CICS RUNUNIT INIT ABENDU4039 NXHEAP CEENXSTG ENVAR

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• At z/OS 2.4, during Rununit Init of a CICS transaction, one may
  experience msg CEE0802C.
  
  ANALYSIS:
  At z/OS 2.4, LE added the CEENXSTG option to create a
  non-executable heap NXHEAP .  The first use of this new heap is
  the ENVAR data.
  Neither the ensm_hwrk1 nor the hpcb_options field was
  initialized by CEEVGTIH. Some variations of junk will lead to
  problems when CEEV#GTS tries to allocate a HANC, not limited to
  the hpcb_4K flag being on.
  
  The Traceback will look like:
  DSA Entry    E Offset
   1  CEEKDUMP +00000F20
   2  CEEVSSFR +00000012
   3  CEEHDSP  +00004A54
   4  CEEHSGLT +00000060  Exception
   5  CEEV#GTS +0000074E
   6  CEEVGTST +00000072
   7  CEEBENV  +000009C0
   8  CEEZENV  +00000822
   9  CEEZINV  +00000300
  10  CEECRINI +00000A00
  
  KNOWN IMPACT:
  The CICS transaction fails.
  
  VERIFICATION STEPS:
  msgCEE0802C and the above traceback info (from the Exception to
  the bottom).
  If one gets an abendU4038, the TERMTHDACT() run-time option will
  need to be changed to obtain a U4039 dump.
  
  Alternately, some flags that are known to cause a problem are:
     ENSM+B0 b20,  resulting in the Heap error,
     ENSM+28C b80, resulting in U4038 in CICS.
  

Local fix

• BYPASS/CIRCUMVENTION:
  On needs to remove the ENVAR() run-time option from CEEPRMxx and
  other places RTOs can be specified.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * z/OS Language Environment users who use environment          *
  * variables or non-executable heap on z/OS V2R4.               *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * When environment variables are specified,  a message         *
  * CEE0802C about  heap damage may be seen when storage is      *
  * allocated from non-executable heap.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * See Problem Description.                                     *
  ****************************************************************
  

Problem conclusion

• The code has been changed to fix this issue.
  

Temporary fix

Comments

APAR Information

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

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

  UI71053

Modules/Macros

• CEEVGTIH
  

Fix information

• Fixed component name

  LE BASE FOR Z/O

• Fixed component ID

  568819801

Applicable component levels

• R7C0 PSY UI71053

     UP20/09/09 P F009

Fix is available

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