OA46515: ABEND0A9 RCFF13 ISTSSCUB TELNET SHARED ACB SESSEND USE COUNT

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABEND0A9 return code FF13 issued by ISTSSCUB (base) offset
  x'266'. The abend occurs during processing of 810688 SESSEND
  for shared ACB Telnet LU.
  Non-zero use count when deleting network address -
  sense code 08060000.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users coding SHAREACB in their           *
  *                 Telnet profile.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: An ABEND0A9 FF13 occurred in ISTSSCUB.  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem can be summarized as follows:
  1. The Telnet profile has SHAREACB coded.
  2. A Telnet LU was in session with a VTAM APPL.
  3. Some action occurred to bring down the VTAM session and
     cleanup VTAM's RDTE for the Telnet LU name (such as a client
     disconnect or the stopping of the Telnet server).
  4. SS started the process of cleaning up the session.  The SIB
     was dequeued from the RDTE, but SS was suspended before
     ISTSSCUB was called to decrement the network address use
     counts.
  5. LUS was dispatched to clean up the session and freed VTAM's
     RDTE for the Telnet LU name, since there were no SIBs.
  6. SS resumed processing and ISTSSCUB was not able to
     decrement the network address use count for the Telnet LU
     because the RDTE was freed.  This caused ISTAMCFR to issue
     a CPRC with sense 08060000 and then ISTSSCUB issued the
     diagnostic ABEND0A9 FF13.
  

Problem conclusion

• To resolve this timing issue, a new bit has been added to the
  ISTRAP to indicate that SS is still using the RDTE for a Telnet
  LU name.
    ISTSSCU3 will set this bit in the RDTE for a Telnet LU
  when it dequeues a SIB.  ISTSSCU3 will reset the bit after
  ISTSSCUB has decrement the network address use count for the
  Telnet LU.
    ISTLUCST and ISTLUCDL will test this bit before freeing the
  RDTE for a Telnet LU.
  

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:

  UA75836 OA46917

Modules/Macros

• ISTLUCDL ISTLUCST ISTRAP   ISTSSCU3
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R1D0 PSY UA75836

     UP15/02/23 P F502

Fix is available

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