IBM Support

IV56062: TCP REQUEST/RESPONSE STYLE COMMUNICATION MAY HANG AFTER ACK PKT.APPLIES TO AIX 7100-03

A fix is available

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • A tcp request/response style communication exchange may
    hang after a pure ACK packet is received and the
    application
    is about to send a new packet.
    
    An iptrace will show this type of pattern right before
    the
    exchange stops:
    request host1>host2
    response host2>host1
    ACK  host1>host2
    --- no further communications for this socket ---
    

Local fix

  • This is a rare condition exposed by efix for defect
    882715.
    

Problem summary

  • A tcp request/response style communication exchange may
    hang when application is about to send a new packet and
    a pure ACK packet is received. Very rare timing scenario
    exposes this problem.
    

Problem conclusion

  • TCP code is modified to send the remaining data when this
    rare timing scenario occurs. Hence the tcp request/response
    style communication  hang is avoided.
    

Temporary fix

Comments

  • 6100-09 - use AIX APAR IV56021
    6100-09 - use AIX APAR IV56021
    6100-09 - use AIX APAR IV56021
    7100-03 - use AIX APAR IV56062
    7100-04 - use AIX APAR IV56086
    

APAR Information

  • APAR number

    IV56062

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2014-02-28

  • Closed date

    2014-02-28

  • Last modified date

    2016-05-10

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

    IV50132

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

Fix information

  • Fixed component name

    AIX V7.1

  • Fixed component ID

    5765H4000

Applicable component levels

  • R710 PSY U859722

       UP14/05/22 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Enterprise Edition

Software version: 710

Operating system(s): AIX

Reference #: IV56062

Modified date: 10 May 2016