IBM Support

PI85228: EXECUTOR CRASH WITH NAT SERVERS AND ICMP ERROR TO RETURN ADDRESS

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APAR status

  • Closed as program error.

Error description

  • Executor (ibmlb2) crash with call stack containing :
    #1  os_mutex_lock
    #2  lbll_select1
    #3  _lbicmp_pbuf_tcpudp_entry
    #4  _lbicmp_pbuf_ip_entry
    #5  lbicmp_pbuf_entry
    #6  lbip_pbuf_entry
    #7  lbipv4_entry
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server Load       *
    *                  Balancer for IPv4 and IPv6 users            *
    ****************************************************************
    * PROBLEM DESCRIPTION: Crash occurs with NAT forwarding when   *
    *                      an ICMP error is received by a          *
    *                      returnaddress IP address.               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Code was assuming a cluster address was present when
    processing ICMP errors which lead to a null pointer reference
    and a crash.
    

Problem conclusion

  • Modified the code to check for a cluster IP when processing
    any ICMP error packets. The Load Balancer will still honor
    ICMP ping requests to the return address but will not process
    any other ICMP responses.
    
    Fix levels:
       8.5.5.13
       9.0.0.5
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI85228

  • Reported component name

    WS EDGE LB IPV4

  • Reported component ID

    5724H8812

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-08-01

  • 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: 900

Reference #: PI85228

Modified date: 10 August 2017


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