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PI38074: LOAD BALANCER FOR IPV4 AND IPV6 IS HUNG UNDER LOAD

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APAR status

  • Closed as program error.

Error description

  • Load Balancer for IPv4 and IPv6 is hung under load.
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server Edge Load  *
    *                  Balancer for ipv4 and ipv6 users            *
    ****************************************************************
    * PROBLEM DESCRIPTION: The executor module hangs and becomes   *
    *                      non-responsive                          *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The executor module can reach a deadlock situation between its
    garbage collection code and packet receive code.
    

Problem conclusion

  • This problem is most likely to occur under a load test using
    the same client IP address repeatedly. Under a heavy load, the
    locking between packet processing and connection cleanup can
    conflict and reach a deadlock situation. Fix was to reduce
    locking criteria.
    
    Fix levels:
       7.0.0.40
       8.0.0.11
       8.5.5.6
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI38074

  • Reported component name

    WS EDGE LB IPV4

  • Reported component ID

    5724H8812

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-03-30

  • Closed date

    2015-04-02

  • Last modified date

    2015-05-28

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

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

Fix information

  • Fixed component name

    WS EDGE LB IPV4

  • Fixed component ID

    5724H8812

Applicable component levels

  • R800 PSY

       UP

  • R850 PSY

       UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.5","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 April 2022