PM77862: GETADDRINFO LOOPS CALLING BPX1RED

A fix is available

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APAR status

  • Closed as program error.

Error description

  • The resolver is configured to use TCP sockets and has two name
    servers defined.  A getaddrinfo call is issued by an
    application. The first name server returns more information
    than can be returned to the caller, causing a truncation bit to
    be set.  An error occurs trying to read the data returned by the
    first name server.  The second name server is queried.  An
    answer is returned which can fit in the supplied buffer, but the
    truncation bit was not cleared.  This causes a loop in EZBRERSN
    trying to read a negative amount of data.  The getaddrinfo will
    not return to the caller.
    .
    VERIFICATION STEPS:
    1) ip systrace shows repeated calls to BPX1RED
    2) ip summ format will show that task in a resolver call such as
    getaddrinfo.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of the IBM Communications Server   *
    *                 for z/OS Version 1 Release(s) 12 and 13 IP   *
    *                 Resolver                                     *
    ****************************************************************
    * PROBLEM DESCRIPTION: A loop occurs during GetHostByAddr      *
    *                      function processing while reading data  *
    *                      from a TCP socket connected to a name   *
    *                      server that has returned only partial   *
    *                      results.                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The checks for a truncated packet allowed a loop control
    variable to become negative and a loop occurred.
    +-------------------------------------------------------------+
    + 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

  • EZBRERSN has been amended to correctly check for a truncated
    packet and discontinue processing with the current name
    server and continue onto the next.
    
    * Cross Reference between External and Internal Names
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM77862

  • 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

    2012-11-27

  • Closed date

    2012-12-31

  • Last modified date

    2013-03-04

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

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

    UK90683 UK90684

Modules/Macros

  • EZBRERSN
    

Fix information

  • Fixed component name

    TCP/IP V3 MVS

  • Fixed component ID

    5655HAL00

Applicable component levels

  • R1C0 PSY UK90683

       UP13/02/02 P F302

  • R1D0 PSY UK90684

       UP13/02/02 P F302

Fix is available

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Document information


More support for:

z/OS family

Software version:

1C0

Operating system(s):

z/OS

Reference #:

PM77862

Modified date:

2013-03-04

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