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PI16435: ABEND 4C5/744A2706 IN MODULE EZBTCRD

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABEND 4C5/744A2706 in module EZBTCRD results from TCPIP's failed
    attempt to set the delayed ACK timer.  Secondary symptoms are
    (1) ABEND4C5 reason code 74F52001 in EZBITKOB+x'750' after
    EZBIFQTO, the query arp info timer routine in EZBIFIND,
    attempts to get an exclusive lock on the ATTLK, and (2) ABEND0C4
    PIC 11 in EZBAFCAL's EZBAFTIM (AFPA (adaptive fast path
    architecture) cache manager timer) routine, at offset x'451A'
    in EZBAFCAL. In each of the three cases, bad parameters are
    being passed to the timer routines.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of the IBM Communications Server   *
    *                 for z/OS Version 1 Release 12 IP: TCPIP      *
    ****************************************************************
    * PROBLEM DESCRIPTION: EZBTCRD tried to set a timer which is   *
    *                      already set, causing a 4C5 abend.       *
    ****************************************************************
    * RECOMMENDATION: Apply PTF                                    *
    ****************************************************************
    A timer is being reset.  In certain timing scenarios, the
    control block can be updated after the timer is already running.
    If the timer pops before the control block update is complete,
    the timer routine can be driven with incorrect parameters.
    This can cause 4C5 abends in the timer processing routines.
    +-------------------------------------------------------------+
    + 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

  • TCPIP is changed to serialize the updating of the timer control
    block prior to the timer being set.
    
    
    * Cross Reference between External and Internal Names
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI16435

  • Reported component name

    TCP/IP V3 MVS

  • Reported component ID

    5655HAL00

  • Reported release

    1C0

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-04-21

  • Closed date

    2014-05-20

  • Last modified date

    2014-08-04

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

    PI11897

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

    UI18159

Modules/Macros

  • EZAFPCKT EZAPINIT EZBIFIND EZBIFIUT EZBIPIGM
    EZBIPINB EZBIPRHD EZBIPRTE EZBISADD EZBISDRF EZBISPTU EZBRWWRI
    EZBTCRD  EZBUDEET EZBUDWRT EZBXFTMR EZBXFUTL EZBXFUT3 EZBX6UTL
    EZBX6UT3 EZB6PEPR EZB6PMLD EZB6PRTE EZB6PRT2 ITTIMER
    

Fix information

  • Fixed component name

    TCP/IP V3 MVS

  • Fixed component ID

    5655HAL00

Applicable component levels

  • R1C0 PSY UI18159

       UP14/07/03 P F407

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

Modified date:
04 August 2014