PI63616: ABEND U4039 OCCURS IN RDZ DAEMON PROCESS DUE TO HEAP DAMAGE

9.1.1.4: PTF UI41212 for Rational Developer for System z
9.1.1.5: PTF UI44156 for Rational Developer for System z
9.1.1.6: PTF UI50717 for Rational Developer for System z
9.1.1.7: PTF UI55786 for Rational Developer for System z
Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• In Rational Developer for System z - RDz - v9.1.1.2, the daemon
  process may
  end with user abend code U4039 because of heap damage.
  
  If LE runtime option HEAPZONES is enabled then the following
  messages can be observed:
  
  CEE3716I The heap check zone following the storage at
     address 46C34FD0 for length X'00000100' has been overlaid
     at address 46C350D0. Each byte in the zone from 46C350D0
     to 46C350DC should contain the value X'55'.
     From entry point tfree at compile unit offset +00000088
     at entry offset +00000088 at address 46601270.
  
  And the following traceback:
  
    Traceback:
      DSA   Entry       E  Offset
      1     CEEVHMSG    +00000846
      2     CEEVRONU    +000010B0
      3     CEEVFHPH    +000006A4
      4     CEEVROND    +00001258
      5     tfree       +00000088
      6     Java_com_ibm_etools_zos_server_CoreJNI_select
  
  Heap damage can be seen in RSE joblog or syslog with messages
  like:
  
  CEE0374C CONDITION=CEE0802C TOKEN=00040322 61C3C5C5 461AEE00
     WHILE RUNNING PROGRAM tfree WHICH STARTS AT 4668F1E8
  
  Additional Keywords: ABENDU4039
  

Local fix

• There is no known workaround at this time.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: 01.All RDz users                             *
  *                 02.All RDz users                             *
  ****************************************************************
  * PROBLEM DESCRIPTION: 01.In Rational Developer for System z   *
  *                         - RDz - v9.1.1.2, the daemon         *
  *                         process may end with user abend      *
  *                         code U4039 because of heap damage.   *
  *                                                              *
  *                         If LE runtime option HEAPZONES is    *
  *                         enabled then the following messages  *
  *                         can be observed:                     *
  *                                                              *
  *                         CEE3716I The heap check zone         *
  *                         following the storage at address     *
  *                         46C34FD0 for length X'00000100' has  *
  *                         been overlaid at address 46C350D0.   *
  *                         Each byte in the zone from 46C350D0  *
  *                         to 46C350DC should contain the       *
  *                         value X'55'. From entry point tfree  *
  *                         at compile unit offset +00000088 at  *
  *                         entry offset +00000088 at address    *
  *                         46601270.                            *
  *                                                              *
  *                         And the following traceback:         *
  *                                                              *
  *                         Traceback: DSA Entry E Offset 1      *
  *                         CEEVHMSG +00000846 2 CEEVRONU        *
  *                         +000010B0 3 CEEVFHPH +000006A4 4     *
  *                         CEEVROND +00001258 5 tfree           *
  *                         +00000088 6                          *
  *                         Java_com_ibm_etools_zos_server_CoreJ *
  *                         NI_select                            *
  *                                                              *
  *                         Heap damage can be seen in RSE       *
  *                         joblog or syslog with messages       *
  *                         like:                                *
  *                                                              *
  *                         CEE0374C CONDITION=CEE0802C          *
  *                         TOKEN=00040322 61C3C5C5 461AEE00     *
  *                         WHILE RUNNING PROGRAM tfree WHICH    *
  *                         STARTS AT 4668F1E8                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  01.RDz server calls select() of USS API to check multiple
     inputs by a single thread. RDz server should prepare enough
     length of heap memory to direct select() api which file
     descriptor numbers should be checked by setting
     corresponding memory bits on. The heap memory length depends
     on the maximum value of the file descriptor numbers to be
     checked. When the maximum file descriptor number is 2048,
     RDz server does not allocate enough heap area and writing
     the bit for the file descriptor number 2048 causes the
     memory corruption. When the maximum number is less than or
     greater than 2048, the problem does not occur. RDz server
     code is updated to allocate enough memory even when the
     maximum number is 2048.
  02.RDz server should support FIPS 140-2 mode in encrypted
     connections
  

Problem conclusion

• 01.RDz server code is updated to allocate enough memory even
     when the maximum value of the file descriptors is 2048.
  02.RDz server is updated to support FIPS 140-2 mode
  

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:

Modules/Macros

• FEKFCORE FEKFCOR6 FEKFENVR FEKFZOS  FEKRSEDE
  

Fix information

• Fixed component name

  RD/Z HOST

• Fixed component ID

  5724T0723

Applicable component levels

• R910 PSY UI41212

     UP16/10/01 I 1000

Fix is available

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