OA42089: ABEND0A9 7075 IN ISTORCFB

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APAR status

  • Closed as program error.

Error description

  • ISTORCFB ABEND0A9 7075 when the same storage is freed twice.
    ISTRPCTC frees it first and then ISTRCCSQ tries to free it
    again causing the abend. VTAM is processing a connection setup
    at the same time the HPR pipe is coming down.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All using HPR/RTP connections.                               *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * ABEND0A9 RC7075 occurs in module                             *
    * ISTORCFB trying to free a RUPE                               *
    * (RPN_CSE_PTR storage).                                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply PTF.                                                   *
    ****************************************************************
    The problem is summarized as follows:
    
    1) A Connection Setup packet is received from an RTP partner
    to establish a CPSVCMG RTP pipe.
    2) A short time later, VTAM received a
    COB (Client Out-of-Band) segment from the RTP partner
    to request RTP deactivation for this same pipe.
    3) It appears the CPSVCMG pipe has already been established
    on VTAM, and this is a duplicate CS being retransmitted
    from the partner.  This may occur if the active end of
    the RTP pipe does not receive the Connection Identifier
    Exchange segment in a timely fashion.
    4) This scenario exposed a timing window where RTP and RCM
    were running concurrently.  RTP was running with the
    RIV response while RCM was running with the CS which exposed
    a synchronization problem.  In this case, module
    ISTRCCSQ issued a FREERUPE for the RPN_CSE_PTR and module
    ISTORCFB took an ABEND0A9 RC7075, as module ISTRPCTC had
    previously freed it.
    
    Note: After the ABEND0A9 occurred, one of the various
    work queues associated with the RCM PAB became corrupted.
    This occurred because of the mishandling of the RUPE
    storage above which lead to the ABEND0A9.  Because the
    queue was corrupted, any new RTP pipes being created, or
    old RTP pipes shutting down, became hung in various states:
    
    New session hung in PBIPLUBF state (PRTPSTR).  Internally,
    the RPNCB has an RPN_Initial state.  RTP pipes shutting down
    showed an internal state of RPN_PENDING_INACT and RPN_GONE.
    

Problem conclusion

  • ISTRPNCB - Defined RPN_RIV_Fmt2_Sent
    
    ISTRPCRC,
    ISTRPCAM - Set RPN_RIV_Fmt2_Sent bit when sending a RIV
               format 2 to RCM
    ISTRCCSP - Modified code to not allocate the CS RUPE for RTP
               if the RPN_RIV_Fmt2_Sent bit is on for
               a connected RTP pipe.
    ISTRPCRT - Included for maintenance purposes only.
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    OA42089

  • Reported component name

    VTAM V4 MVS/ESA

  • Reported component ID

    569511701

  • Reported release

    210

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-04-25

  • Closed date

    2013-05-22

  • Last modified date

    2014-07-15

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

    OA41951

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

    UA69206

Modules/Macros

  • ISTRCCSP ISTRPCAM ISTRPCRC ISTRPCRT
    

Fix information

  • Fixed component name

    VTAM V4 MVS/ESA

  • Fixed component ID

    569511701

Applicable component levels

  • R210 PSY UA69206

       UP13/06/25 P F306

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.



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Document information


More support for:

z/OS family

Software version:

210

Operating system(s):

z/OS

Reference #:

OA42089

Modified date:

2014-07-15

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