OA24047: RTPINFO GETBLK POOL FILLING UP WITH SGMNTS (HPR SEGMENTS)

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• VTAM storage growth in the RTPINFO SPANC pool. The RTPINFO
  pool is full of SGMNT (HPR segment) control blocks.
  Additional Symptom: Abend0A9 RC 7002 in module ISTRPCSG.
  

Local fix

• Contact IBM Software support.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All using HPR/RTP connections.               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Private storage fills with SGMN control *
  *                      blocks.  Storage is allocated from the  *
  *                      RTPINFO GETBLK storage pool.            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem is summarized as follows:
  1) A malformed PIU is received on the NCBWORKQ for an
     HPR pipe.  The PIU is built from an IO buffer and one of
     the TSCCONT TSCBs has a TSCDATLN that exceeds the IO
     buffer size.  The IO buffer following this PIU has
     also been overlayed.  No documentation was available
     to debug how the malformed PIU was built incorrectly.
     This APAR is taken to address a loop that occurs when
     processing this PIU.
  2) An HPR pipe dispatched and processed the PIU.  Since
     the PIU length exceeded the largest NLP this pipe can
     send, the PIU must be segmented by HPR.
  3) While segmenting this PIU, the HPR code went into
     an infinite loop allocating HPR segment (SGMN)
     control blocks.
  4) Eventually, the RTPINFO storage pool could not expand
     any further (x'FFFF' pages), and an ABEND0A9 RC7002
     was issued in module ISTRPCSG when trying to allocate
     another SGMN control block.
  5) The RPNCB was cleaned up, but all of the storage
     allocated while processing the invalid PIU was lost.
     The storage shortage in the RTPINFO pool caused many
     other RTP pipes to receive ABEND0A9 RC7002 conditions
     as a result of the storage shortage in this GETBLK
     pool.
  

Problem conclusion

• ISTRPCSG - Code segment SEGMNTT has been corrected to detect
             when the data within on TSCB exceeds the
             NLP size for the RPNCB.  If this occurs, an
             ABEND0A9 RCFF13 is issued.
  ISTRPCRT - Has been 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:

  UA39790 UA39791 UA39792 OA24981

Modules/Macros

• ISTRPCRT ISTRPCSG
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R170 PSY UA39790

     UP08/04/07 P F804

• R180 PSY UA39791

     UP08/04/07 P F804

• R190 PSY UA39792

     UP08/04/07 P F804

Fix is available

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