PM56698: ABEND U4039 WHEN RUNNING SNMPQE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• SNMPQE abends with a U4093 when attempting to send a message to
  NetView over IUCV.  Review of a dump will show that the U4093
  was actually an 0C4 rc4.
  
  Verification Steps:
  
  An LE traceback of the abend will show the following sequence of
  function calls:
  
    sock_request_iucv
    common_send
    write
    send_response
    ret_resp
    getSNMPresponse
    await_queries
    main
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the IBM Communications Server   *
  *                 for z/OS Version 1 Release 13 IP:            *
  *                 IUCV Sockets                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend U4039 in a C sockets application  *
  *                      using CMIUCSOC for the sockets API.     *
  *                      Load module will have EZAAD028 included *
  *                      during linkedit or bind time.           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Abend U4039 in a C sockets application using CMIUCSOC for the
  sockets API.  Load module will have EZAAD028 included during
  linkedit or bind time.
  
  An abend U4039 may occur on a send() or write() operation that
  uses CMIUCSOC for the sockets API.  These API calls pass through
  the common_send function where a request list is built and
  passed to socket_request_iucv or socket_request_inet based on
  the family of the socket.  The request list built by common_send
  includes an array of buffers and lengths.  The array entries are
  not being filled in correctly which causes the subsequent
  request routine to copy data from incorrect buffer addresses or
  use incorrect lengths.
  The copy operation with an incorrect length can cause a storage
  overlay in the application private area.  The target buffer may
  reside in the heap and thus heap corruption can also occur.
  
  This problem was reported against SNMPQE which uses an IUCV
  socket to communicate with the SNMPTASK in NetView.  Other
  load modules that are supplied by Communications Server that
  include CMIUCSOC are:
    CSAMPLE
    DIG
    LB@ADMIN
    LLBD
    NCPROUTE
    NDBCLNT
    NDBPS
    NDBSS
    NIDL
    NRGLBD
    NSLOOKUP
    PERFCLNT
    PERFSERV
    PORTCLNT
    PORTMAP
    RFCINIT
    RPCINFO
    SQESERF
    SQESERV
    UUID@GEN
  
    DPI functions  MKDPIREG MKDPIRES MKDPITRA MKDPISET CDPIPACK
                   FDPIPARS MKMIBQRY MKDPILIS MKDPITRE PDPIPKT
  +-------------------------------------------------------------+
  + Please check our Communications Server for OS/390 homepages +
  + for common networking tips and fixes.  The URL for these    +
  + homepages can be found in Informational APAR II11334.       +
  +-------------------------------------------------------------+
  

Problem conclusion

• CMIUCSOC has been amended to correctly build the request list
  array.
  
  ****************************************************************
  * FUNCTION AFFECTED: Communications Server TCP/IP (PM56698)    *
  *                     C Sockets API                            *
  ****************************************************************
  * DESCRIPTION      : Recompile/relink application              *
  ****************************************************************
  * TIMING           : Post-APPLY                                *
  ****************************************************************
  All C Sockets API programs that have been linked with a SYSLIB
  DD statement pointing to the V1R13 version of SEZACMTX must be
  relinked.
  
  Communications Server supplied load modules will be relinked
  automatically during the apply process and need no further
  action.
  
  * Cross Reference between External and Internal Names
  EZAAD028 (CMIUCSOC)
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UK76415

Modules/Macros

• EZAAD028
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R1D0 PSY UK76415

     UP12/03/31 P F203

Fix is available

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