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PM77118: EZBITDSA( UK68305 11.151)+000084 S4C5/74FF2000

A fix is available


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APAR status

  • Closed as program error.

Error description

  • ABENDS4C5 Reason 74FF2000 (TcpitProcStackExceeded in EZBITDSA)
    can occur when multiple internal routines within EZBTCUTL are
    called that have external entry points due to slight increase
    in dynamic storage allocation from PTF UK82041.
    Verification Steps:
    - Abending DUCB ( IP TCPIPCS DUAF ) will have a calling
        module sequence as follows:
    291CF6F0 24464000 244641A0 00ED6080 0250 WSWEBP10
    004C5000 Ab Iu Su
    RSA  244646E8  Prev 00000000  Next 244647A0  Mod EZBITDUM
    RSA  244647A8  Prev 244646E8  Next 20C7B038  Mod EZBTCRD:
    RSA at 20C7B040 is outside address range of DUSA
    RSA  20C7B040  Prev 244647A8  Next 20C7C5C0  Mod EZBTCRD:
    RSA  20C7C5C8  Prev 20C7B040  Next 20C7C9C0  Mod EZBTCRDG
    RSA  20C7C9C8  Prev 20C7C5C8  Next 20C7DB50  Mod EZBTCUTL
    RSA  20C7DB58  Prev 20C7C9C8  Next 20C7ECE0  Mod EZBTCUTL
    RSA  20C7ECE8  Prev 20C7DB58  Next 00000000  Mod EZBTCUTL
    Additional Symptom(s) Search Keyword(s):

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of the IBM Communications Server   *
    *                 for z/OS Version 1 Release(s) 13 IP          *
    * PROBLEM DESCRIPTION: Abend4C5 rsn74ff2000 in EZBITDSA with   *
    *                      PM71528/UK82041 installed.              *
    * RECOMMENDATION:                                              *
    Abend4C5 rsn74ff2000 in EZBITDSA with PM71528/UK82041 installed.
    The error occurs on a local TCP connection when SMFCONFIG
    TCPTERM and/or NETMONITOR TCPCONNSERVICE is configured in the
    profile.  A timing condition exists where the packet flow on a
    local TCP connection finds one end of the connection has been
    deleted.  This causes a RST packet to be generated and sent
    back to the TCP inbound processing path under the same unit
    of work.  When the RST packet is processed an external call to
    EZBTCUTL is made to clean up resources associated with the
    connection.  During the clean up process an external call to
    another routine in EZBTCUTL is made to generate a termination
    record.  While creating the termination record an external call
    to another routine in EZBTCUTL is made to format the data.
    A call is then made to EZBITSCB to record the termination
    record but the dynamic storage is exhausted.  A call is made
    to EZBITDSA to expand the dynamic storage and the S4C5 abend
    is issued because there is already one expansion associated
    with this unit of work.
    The code changes in PM71528 increased the dynamic storage
    requirements for all external calls to EZBTCUTL by a small
    amount.  The dynamic storage requirements in the error path
    prior to PM71528 was very close to the limit.  The increase
    in dynamic storage by PM71528 and the 3 external calls to
    EZBTCUTL in the error path caused the dynamic storage to
    exceed the limit.
    + Please check our Communications Server for OS/390 homepages +
    + for common networking tips and fixes.  The URL for these    +
    + homepages can be found in Informational APAR II11334.       +

Problem conclusion

  • EZBITDSA has been amended to allow an additional dynamic storage
    expansion area.
    * Cross Reference between External and Internal Names

Temporary fix


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Applicable component levels

  • R1D0 PSY UK90038

       UP13/02/01 P F301

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.

Document information

More support for: z/OS family

Software version: 1D0

Operating system(s): z/OS

Reference #: PM77118

Modified date: 04 February 2013