PM85519: S4C5/74597243 ABEND IN EZBTCUTL

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • An application listening on a TCP port is being shut down.  If a
    new connection (SYN packet) arrives for that port at the same
    time as the close for the listener socket is being performed,
    the potential exists for the TCB associated with the new
    connection to be freed twice.  The second attempt (probably
    associated with the SRB processing the inbound packet) will get
    an ABENDS04C5 RSN74597243.
    
    The resultant dump title will contain the phrase
       EZBTCUTL(ppppppp yy.ddd)+xxxxxx S4C5/74597243
    where the values will vary by maintenance level.  Examples seen
    for this have been:
    
       (UK75333 12.011)+0011E2
       (UK81852 12.263)+0011E2
    
    The stack should continue processing without other symptoms.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of the IBM Communications Server   *
    *                 for z/OS Version 1 Release 13 IP             *
    ****************************************************************
    * PROBLEM DESCRIPTION: Abend S4C5/74597243 in EZBTCUTL.        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    There is a timing window in which a new connection started
    to a listener socket at the same time the socket is
    being closed may cause the TCB control block associated
    with the new connection to be freed twice.
    The second attempt to free the TCB will result in an abend.
    +-------------------------------------------------------------+
    + 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

  • EZBTCPCN has been modified so that the TCB storage
    is only freed once.
    
    * Cross Reference between External and Internal Names
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM85519

  • Reported component name

    TCP/IP V3 MVS

  • Reported component ID

    5655HAL00

  • Reported release

    1D0

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-03-25

  • Closed date

    2013-04-24

  • Last modified date

    2013-06-04

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

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

    UK93750 PM88077

Modules/Macros

  • EZBTCPCN
    

Fix information

  • Fixed component name

    TCP/IP V3 MVS

  • Fixed component ID

    5655HAL00

Applicable component levels

  • R1D0 PSY UK93750

       UP13/05/24 P F305

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:

1D0

Operating system(s):

z/OS

Reference #:

PM85519

Modified date:

2013-06-04

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