OA46353: ABENDS0C4 IN NETSERV RELATED MODULES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• External symptoms:
  Customer encountered ABEND0C4 in various netserv related
  modules - IATNTTXR, IATNTTCT, IATGRQM
  Impact to customer;
    Netserv continues to run
  Additional symptoms:
    ABENDDFB abend when attempting to process records pointed to
  by the NSST
  Analysis:
    The NSST chain is manipulated by IATGRQM but there is a lack
  of serialization resulting in modules examining/manipulating the
  chain abending
  
  The projected closing close for HJS7790 and HJS77A0 is PER.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of HJS7790 and HJS77A0.            *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0C4 in various Netserv modules:    *
  *                      IATNTTXR, IATNTTCT, IATGRQM             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Processing during socket activation and deactivation can create
  situations where one or more Netserv subtasks can be scanning
  the NSST (IATYNSST) chain while it is being altered.  Though
  the IATXFIFO macro provides a serialized method for subtasks
  to alter the NSST chain, it affords no protection for subtasks
  that just read it.  This can have unpredictable results which
  include the reported symptoms.
  

Problem conclusion

• Installation On (Netserv)
               Order (Any)
  Activation   Order (Any)
               Type/JES3 restart (Hot/Local/Netserv)
               Type/IPL (None)
               CLPA (No)
  (See Apar II07968 for definitions)
  
  Macro IATYNSCT was changed to provide a latch serialization
  work area.  Module IATNTTAC was changed to correctly acquire
  an updated NSCT (IATYNCST) on JES3 hot starts.  Modules
  IATNTTCT, IATNTTSS, and IATNTTXR were changed to use the
  latch to serialize access to the NSST (IATYNSST) chain.
  IATNTTXR's changes also included code to initialize and use
  the latch mechanism.  Module IATABPR was included to
  pick up the changes to IATYNSCT.
  
  Though the changes for this APAR correct a potential cause of
  the reported problem, other unrelated causes may exist and are
  not addressed by this fix.
  
  APAR OA46353 prereq's (and sup's) for FMID HJS7790:
  Pre's: * NONE *
  
  APAR OA46353 prereq's (and sup's) for FMID HJS77A0:
  Pre's: * NONE *
  

Temporary fix

• *** * TEMPORARY FIX MAY BE OBTAINED FROM DLL OR INFO/ACCESS ****
  ******************* OA46353  DECK AVAILABLE ********************
  

Comments

APAR Information

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

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

  UA77575 UA77576

Modules/Macros

• IATABPR  IATNTTAC IATNTTCT IATNTTSS IATNTTXR
  IATYNSCT
  

Fix information

• Fixed component name

  JES3

• Fixed component ID

  5752SC1BA

Applicable component levels

• R7A0 PSY UA77575

     UP15/06/17 P F506

• R790 PSY UA77576

     UP15/06/17 P F506

Fix is available

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