OA41033: ABEND0C4 PIC4 ISTTSCAR HVT61C0 +1CA8 NUCLEUS IOSVIRBA

Obtain the fix for this APAR.

APAR status

• Closed as unreproducible in next release.

Error description

• Abend in ISTTSCAR occurs in UNLOCK routine when called from
  segment SENDDLC when running disabled after FINDNCB routine
  returns an LUCB pointer rather than an NCB pointer. SENDDLC
  neglects to set the HNTEPTR needed for latch processing in
  UNLOCK routine in this case.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of VTAM RTP connections.           *
  *                                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0C4 in ISTTSCAR due to HNTEPTR=0   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem may be summarized as follows:
  1. A two (or more) hop HPR connection is established.
  2. At one of the ANR nodes, the NCB that represents the
     next hop DLC connection is freed and the element
     address is reused for an application.
  3. When an NLP next arrives at the ANR node,
     ISTTSCAR finds an LUCB instead of an NCB
     and when it tries to free the CIDCTL lock,
     the ABEND0C4 occurs because HNTEPTR had not
     been set.
  

Problem conclusion

Temporary fix

Comments

• ISTTSCAR has been updated to set HNTEPTR even if the
  control block found is an LUCB.
  
  ISTRPCRT has been included for maintenance purposes only.
  

APAR Information

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

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

  UA67651 UA67652

Modules/Macros

• ISTRPCRT ISTTSCAR
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R1C0 PSY UA67651

     UP13/02/20 P F302

• R1D0 PSY UA67652

     UP13/02/20 P F302

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.