IBM Support

PI84336: LOAD BALANCER FOR IPV4 and IPV4 CRASH WITH HIGHAVAILABILITY AFFINITY REPLICATION

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APAR status

  • Closed as program error.

Error description

  • Load Balancer for ipv4 and ipv6 crash with call stack
    containing:
    #3  os_memalloc
    #4  _lbsel_ct_getnewcr
    #5  _lbha_handlereprecords
    #6  _lbha_event
    #7  lbhahb_pbuf_entry
    

Local fix

  • The customer may see relief from crash if they temporarily
    change the repstrategy to replicate connection records only.
    There is a little loss of function with this workaround but it
    might be less impact than the unexpected crash.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server Load       *
    *                  Balancer for IPv4 and IPv6 high             *
    *                  availability users with affinity            *
    *                  replication                                 *
    ****************************************************************
    * PROBLEM DESCRIPTION: The backup Load Balancer for ipv4 and   *
    *                      ipv6 crashing during a memory           *
    *                      allocation of an affinity record.       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Executor consuming excessive memory and eventual crash from
    failed memory allocation.
    

Problem conclusion

  • The backup load balancer was not removing expired affinity
    records properly which lead to memory allocation failures and
    a crash of the executor.
    
    Fix levels:
        8.5.5.13
        9.0.0.6
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI84336

  • Reported component name

    WS EDGE LB IPV4

  • Reported component ID

    5724H8812

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-07-11

  • Closed date

    2017-08-10

  • Last modified date

    2017-08-10

  • 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

  • R850 PSY

       UP

  • R900 PSY

       UP



Document information

More support for: WebSphere Application Server
Edge Component

Software version: 8.5

Reference #: PI84336

Modified date: 10 August 2017


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