VM65434: RXSOCKETS ERRORS ENCOUNTERED IN MULTITASKING ENVIRONMENT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An application using REXX sockets (RXSOCKET) encounters various
  errors ranging from storage overlays to queries returning on
  threads that did not expect that return.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Anyone using Rexx Sockets (RXSOCKET) in an   *
  *                 application also using the CMS Multitasking  *
  *                 environment may be affected by this change.  *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  Various errors on thread returns and CMS and application ABENDs
  may occur when using REXX sockets.
  

Problem conclusion

• Two main problems are corrected:
  
    1. Serialization of the nameserver (eg: ensuring there is
       only one resolve, gethostbyname, or gethostbyaddr call
       active at any given time)
  
    2. Several variations of storage overlay problems
  
  The serialization of the nameserver is corrected by using
  private storage areas for each thread in the call stack,
  instead of relying on a global work area.
  
  The storage overlay problems are corrected by properly saving
  and restoring register 0 across calls and IUCV interrupts.
  
  THE FOLLOWING CHANGES HAVE BEEN MADE TO THE SYSTEM REFERENCE
  LIBRARIES:
  ***START PUBLICATION CHANGE*************************************
  PUBLICATION TITLE: z/VM CMS and REXX/VM Messages and Codes
            RELEASE: z/VM 6.2.0
       ORDER NUMBER: GC24-6161-02
  -------------------------------------------
  CHAPTER: 3
  PAGE: 246
  ABSTRACT:
  Add "ID: nnnn" to first format of message DMS1442I
  BODY:
  In the general description, add the socket number identifier
  with "ID: nnnn"
  
     - IUCV nnnnnnnn interrupt for socket call nnnnnnnn on socket
     {socket|PATH} {socket number|path id}; ID: nnnn
  
  ***START PUBLICATION CHANGE*************************************
  PUBLICATION TITLE: z/VM CMS and REXX/VM Messages and Codes
            RELEASE: z/VM 6.3.0
       ORDER NUMBER: GC24-6161-02
  -------------------------------------------
  CHAPTER: 3
  PAGE: 246
  ABSTRACT:
  Add "ID: nnnn" to first format of message DMS1442I
  BODY:
  In the general description, add the socket number identifier
  with "ID: nnnn"
  
     - IUCV nnnnnnnn interrupt for socket call nnnnnnnn on socket
     {socket|PATH} {socket number|path id}; ID: nnnn
  

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:

  UM34624 UM34625 UM34626 UM34627

Modules/Macros

• DMSMES   DMSMESA  DMSMESB  DMSRXS   DMSRXU
  DMSRXV   DMS1442I SOCBLOKS SOCCALL  SOCENTER SOCEXIT  SOCMSG
  SOCSECT
  

Fix information

• Fixed component name

  VM CMS

• Fixed component ID

  568411201

Applicable component levels

• RA62 PSY UM34624

     UP15/07/02 P 1501

• RA63 PSY UM34625

     UP15/07/02 P 1601

• R620 PSY UM34626

     UP15/06/09 P 1501

• R630 PSY UM34627

     UP15/06/09 P 1601

Fix is available

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