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PH06308: WEBSPHERE WEBSERVER PLUGIN CRASHES WHEN HANDLING WEBSOCKET REQUEST IN ESI CACHE.

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APAR status

  • Closed as program error.

Error description

  • WebSphere webserver plugin crashes when handling websocket
    request in ESI cache.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server web        *
    *                  server plugin users                         *
    ****************************************************************
    * PROBLEM DESCRIPTION: If ESI is enabled on the webserver      *
    *                      plugin and websocket traffic is         *
    *                      cached, plugin may crash.               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When the initial websocket request is answered from ESI cache,
    no server is selected so the next request causes a crash from
    a null server object.
    Crash stack:
    #0   serverGetWsServerIOTimeout (server=0x0, reqInfo=...)
    #1   requestGetServer (request=...)
    #2   websphereHandleRequest (reqInfo=...)
    #3   as_handler (req=...)
    

Problem conclusion

  • Fix restricts the ESI cache from answering initial websocket
    requests to ensure a server is selected.
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 8.5.5.16 and 9.0.0.11.  Please refer to the
    Recommended Updates page for delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

  • Disable ESI caching when using websockets.
    

Comments

APAR Information

  • APAR number

    PH06308

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-12-11

  • Closed date

    2019-01-31

  • Last modified date

    2021-05-03

  • 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

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels

  • R850 PSY

       UP

  • R900 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
14 October 2021