IBM Support

PH18920: EDGE LOAD BALANCER V9.50.1 CRASH IN LBLL_SELECT1_NL WITH HIGH AVAILABILITY REPLICATION AND AFFINITY BASED FORWARDING

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APAR status

  • Closed as program error.

Error description

  • When using Edge Server Load balancer in high availability mode,
    the standby load balancer crashed and generated a core dump.
    High availability replication must be configured to replicate
    affinity records to experience this crash.
    
    The Linux server /var/logs/messages had the following errors:
    ibmlb2: 1396555.202050 lb_ha.c:414 HA:add AT record failed
    A similar message would be logged in ibmlb2.log if running on
    Windows operating systems.
    
    The crash stack will contain lbll_select1_nl near the top of
    the stack.
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server Load       *
    *                  Balancer for IPv4 and IPv6 users            *
    ****************************************************************
    * PROBLEM DESCRIPTION: Crash occurs on standby load balancer   *
    *                      when running with high availability     *
    *                      and affinity (or conn+affin)            *
    *                      replication.                            *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The affinity table get corrupted and reference to a bad
    pointer occurs.
    

Problem conclusion

  • Corrected code to guard against corruption and bad pointer
    access under corrupted situations.
    Fix levels:
    8.5.5.17
    9.0.5.3
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH18920

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-11-06

  • Closed date

    2019-11-27

  • Last modified date

    2019-11-27

  • 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



Document information

More support for: WebSphere Application Server
Edge Component

Software version: 900

Reference #: PH18920

Modified date: 27 November 2019