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PH13269: DELAY ALPN INIT UNTIL REQUIRED AND FREE ALPN RESOURCES ON CONNECTION ERRORS TO PREVENT OUTOFMEMORY

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Whenever the client connections fail the connection with
    "bad
    certificate", the server isn't cleaning up and this
    eventually
    results in an OutOfMemory error.
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server Liberty                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: OutOfMemory condition can occur when    *
    *                      HTTP/2 is enabled.                      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When HTTP/2 is enabled, failed HTTP connection attempts over SSL
    can leak a very small amount of memory.  Over time, this can
    accumulate and lead to an OutOfMemory condition.  This problem
    occurs because the HTTP/2 code is not properly cleaning up the
    connection objects on these failed connection attempts.
    
    The leak suspect will likely show up as a
    java.util.concurrent.ConcurrentHashMap$Node[] being held by a
    com.ibm.jsse2.ext.a object.
    

Problem conclusion

  • Objects are now properly cleaned up on failed HTTP connection
    attempts over SSL when HTTP/2 is enabled.
    
    The fix for this APAR is currently targeted for inclusion in fix
    pack 19.0.0.6  Please refer to the Recommended Updates page for
    delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

  • Disabling HTTP/2 via configuration parameters in the server.xml
    will prevent this problem.
    

Comments

APAR Information

  • APAR number

    PH13269

  • Reported component name

    WAS LIBERTY COR

  • Reported component ID

    5725L2900

  • Reported release

    CD0

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-06-12

  • Closed date

    2019-09-05

  • Last modified date

    2019-09-05

  • 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

    WAS LIBERTY COR

  • Fixed component ID

    5725L2900

Applicable component levels

  • RCD0 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSD28V","label":"WebSphere Application Server Liberty Core"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
17 October 2021