OA35090: ABEND0A9 RC=FF14 IN ISTLSCMG PROCESSING TIMER QUEUE ELEMENT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABEND0A9 RC=FF14 in ISTLSCMG processing timer queue element
  occurs 30 seconds after LCS link FSM is set to active. The timer
  that was started when VTAM sent connect.request was not canceled
  when the connect.confirm was received.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All using switched XCA connections.          *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0A9 RCFF14 occurs in               *
  *                      module ISTLSCMG                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem is summarized as follows:
  1) A remote switched PU is trying to establish a connection
     to VTAM.
  2) XID negotiations proceed far enough for a CONTACTED RU
     to be sent to PUNS/ConfigSvcs.
  3) The CONTACTED RU was processed and module ISTACCQ4
     scheduled the AUNCB PU PAB to set the LSNFSM to
     station active.
  4) Unexpectedly, the PU PAB was dispatched to process a
     CLOSE_STATION_INDication received from the remote PU.
  5) Recovery processing is called to take down and subsequently
     recover the link.  However, a small timing
     window allowed the LSNCB_CONTACT_COMPLETE bit to be left on.
  6) At some time later, the remote PU attempts to recover the
     connection by sending in an XID.  The same line was reused
     for the new connection.
  7) Dial-in processing reaches an LSNFSM state of
     LSN_SW_CONNECT_REQUESTED.  A Connect.Request is sent to the
     adaptor for this connection.  The LSNTQE is set to time
     the request.
  8) In this case, an unexpected XID arrives at the LSNCB PU PAB
     which causes the LSNCB PU PAB to modify the LSNFSM to
     station active.  This occurs because the
     LSNCB_CONTACT_COMPLETE bit is still on causing incorrect
     processing.
  6) Module ISTINCTM, processes the TQE request issued by ISTLSCNB
     It unexpectedly discovers the TQE is still active and
     issues an ABEND0A9 FF13.
  7) When the Connect.Response is received, it is discarded by
     the PU PAB due to the unexpected LSNFSM state of station
     active.
  8) Since the Connect.Response was not processed, the LSNTQE was
     cancelled.
  9) When the LSNTQE timer pops, module ISTLSCMG take an ABEND0A9
     RCFF14 due to the unexpected FSM state.
  

Problem conclusion

• ISTLSCLD,
  ISTLSCLF - Have been modified to unconditionally clear
             the LSNCB_CONTACT_COMPLETE bit.
  ISTACCQ4,
  ISTLSCLA,
  ISTLSCNG,
  ISTLSCNH,
  ISTLSCLJ,
  ISTLSC6V,
  ISTLSCKN - Included for maintenance purposes only.
  

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:

  UA58488 UA58489 UA58490

Modules/Macros

• ISTACCQ4 ISTLSCKN ISTLSCLA ISTLSCLD ISTLSCLF
  ISTLSCLJ ISTLSCNG ISTLSCNH ISTLSCSN ISTLSC6I ISTLSC6V
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R1A0 PSY UA58488

     UP11/01/19 P F101 Ž

• R1B0 PSY UA58489

     UP11/01/19 P F101 Ž

• R1C0 PSY UA58490

     UP11/01/19 P F101 Ž

Fix is available

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