OA32369: ACTPU FOR SWITCHED PU REMAINS IN PDISC STATE, FAILS TO ACTIVATE WITH IST380I ACTPU REQUEST ERROR MESSAGE AND SENSE 08010000

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• In certain conditions, the ACTPU processing for a switched PU
  might fail with the following message:
   IST380I ERROR FOR ID = xxxxxx - REQUEST: ACTPU, SENSE: 08010000
  A display of the switched PU resource will show state of PDISC
  to indicate pending discontact response and the PU fails to
  activate and remains hung.
  The associated LSNCB will show LSNFSM value of x'9C' for
  LSN_SW_CONNECT_REQUESTED state and the RCCRNAA bits in RCCBITAN
  flags for the switched PU control block will show value of x'4'
  for RCCRNAT4 to indicate that CONTACTED x'0A' has been received.
  The VIT trace will show that the switched PU got sidequeued
  (non-zero LSNSIDEQ) and the PAB did not get scheduled to update
  the switched PU to the correct state of CONCT.
  

Local fix

• None. There is no certainty that forced deactivation and
  re-activation of the switched resources will work.
  KEYWORDS:
  IST380I ACTPU SWITCHED PU PUT2 PUT21 SENSE 08010000 PDISC
  CONTACTED 0A LSN_SW_CONNECT_REQUESTED LSNSIDEQ ISTACCQ4
  RCCRNAT4 Q4CTD0A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All using dependent PUs (PU T2.0)            *
  *                 attached as switched PUs through XCA LAN.    *
  ****************************************************************
  * PROBLEM DESCRIPTION: PU T2.0 hangs in PDISC state after      *
  *                      ACTPU failure (SENSE 08010000).         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem is summarized as follows:
  
  1) A switched PU T2.0 is being dialed:
  
   V NET,DIAL,ID=puname
  
   IST590I CONNECTOUT ESTABLISHED FOR PU puname ON LINE linename
   IST380I ERROR FOR ID = puname - REQUEST: ACTPU, SENSE: 08010000
  
  2) During CONTACTED processing, module ISTACCQ4 initiates an
     ACTPU flow to activate the SSCP-PU session.  The ACTPU
     request is eventually queued by SESSER to the LSNCB PC PAB.
  
  3) Module ISTLSC6V rejects the ACTPU with SENSE 08010000 because
     the LSNFSM (LSNCB link state) is not in station active state
     prior to the arrival of the ACTPU request.  In this problem,
     the LSNCB PU PAB (ISTLSCLA) has not run to change the
     LSNFSM to station active (from CONTACTED processing).
  
  4) A subsequent display of the PU shows it is hung in PDISC
     state (Could be PFDSC state).
  
  5) A similar problem exists if the PU dials-in to VTAM:
  
   IST590I CONNECTIN ESTABLISHED FOR PU puname ON LINE linename
   IST380I ERROR FOR ID = puname - REQUEST: ACTPU, SENSE: 08010000
  

Problem conclusion

• The following changes have been made:
  
  ISTLSC6V - Has been changed to check the LSNCB_CONTACT_COMPLETE
             bit.  If ON, the LSNFSM is set to
             LSN_SW_STATION_ACTIVE.  This code is added in the
             event the LSNCB PU PAB has not yet run prior to the
             LSNCB PC PAB being dispatched to process the ACTPU
             request.
  ISTLSCNG,
  ISTLSCNH - Both modules have been changed to set the
             LSNFSM to LSN_SW_STATION_ACTIVE for PU T2.0
             devices after a CONTACTED request is sent to PUNS.
  
  ISTLSCLJ - Modified segment SWITCHED to process a DISCONTACT
             request if the LSNFSM is LSN_SW_CONNECT_REQUESTED
             state and the LSNLFLOW bit is ON, indicating a
             positive Connect.confirm has been received.  If
             LSNLFLOW is OFF, the DISCONTACT will be sidequeued
             until the TQE timing the Connect flow expires.
  
  ISTACCQ4,
  ISTLSC6I,
  ISTLSCSN,
  ISTLSCLA - Included for maintenance purposes.
  

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:

  UA53596 UA53597 UA53598 OA32797

Modules/Macros

• ISTACCQ4 ISTLSCLA ISTLSCLJ ISTLSCNG ISTLSCNH
  ISTLSCSN ISTLSC6I ISTLSC6V
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R1A0 PSY UA53596

     UP10/04/27 P F004 Ž

• R1B0 PSY UA53597

     UP10/04/27 P F004 Ž

• R190 PSY UA53598

     UP10/04/27 P F004 Ž

Fix is available

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