IBM Support

PI52696: WebSphere Application Server proxy - Too many open files

Fixes are available

8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
16.0.0.2: WebSphere Application Server Liberty 16.0.0.2
16.0.0.3: WebSphere Application Server Liberty 16.0.0.3
16.0.0.4: WebSphere Application Server Liberty 16.0.0.4
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
17.0.0.1: WebSphere Application Server Liberty 17.0.0.1
17.0.0.2: WebSphere Application Server Liberty 17.0.0.2
17.0.0.3: WebSphere Application Server Liberty 17.0.0.3
17.0.0.4: WebSphere Application Server Liberty 17.0.0.4
18.0.0.1: WebSphere Application Server Liberty 18.0.0.1
18.0.0.2: WebSphere Application Server Liberty 18.0.0.2
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
18.0.0.3: WebSphere Application Server Liberty 18.0.0.3
18.0.0.4: WebSphere Application Server Liberty 18.0.0.4
19.0.0.1: WebSphere Application Server Liberty 19.0.0.1
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
19.0.0.2: WebSphere Application Server Liberty 19.0.0.2
19.0.0.3: WebSphere Application Server Liberty 19.0.0.3
19.0.0.4: WebSphere Application Server Liberty 19.0.0.4
19.0.0.5: WebSphere Application Server Liberty 19.0.0.5
19.0.0.6: WebSphere Application Server Liberty 19.0.0.6
19.0.0.7: WebSphere Application Server Liberty 19.0.0.7
19.0.0.8: WebSphere Application Server Liberty 19.0.0.8
19.0.0.9: WebSphere Application Server Liberty 19.0.0.9
19.0.0.10: WebSphere Application Server Liberty 19.0.0.10
19.0.0.11: WebSphere Application Server Liberty 19.0.0.11
19.0.0.12: WebSphere Application Server Liberty 19.0.0.12
20.0.0.1: WebSphere Application Server Liberty 20.0.0.1
20.0.0.2: WebSphere Application Server Liberty 20.0.0.2
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
20.0.0.3: WebSphere Application Server Liberty 20.0.0.3
20.0.0.4: WebSphere Application Server Liberty 20.0.0.4
20.0.0.5: WebSphere Application Server Liberty 20.0.0.5
20.0.0.6: WebSphere Application Server Liberty 20.0.0.6
20.0.0.7: WebSphere Application Server Liberty 20.0.0.7
20.0.0.8: WebSphere Application Server Liberty 20.0.0.8
20.0.0.9: WebSphere Application Server Liberty 20.0.0.9
20.0.0.10: WebSphere Application Server Liberty 20.0.0.10
20.0.0.11: WebSphere Application Server Liberty 20.0.0.11
20.0.0.12: WebSphere Application Server Liberty 20.0.0.12

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • All threads are being blocked after SSL Channel is closing .
    All the WebSphere Application Server  proxy threads were held
    in a writing block after proxy did an error determination and
    issued a close on the connection.
    

Local fix

  • n/a
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server Version    *
    *                  8.5.5 and 9.0.0.0 Full Profile, and Liberty *
    *                  Profile 8.5.5 users of the SSL Channel      *
    ****************************************************************
    * PROBLEM DESCRIPTION: Threads servicing SSL connections       *
    *                      might be blocked by the closing         *
    *                      handshake write.                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The closing handshake write for each connection driven through
    the SSL Channel is currently thread blocking. If the write
    does not complete immediately, the channel will continue to
    attempt writing indefinitely. This behavior blocks the thread
    and a message similar to the following might be reported:
    WSVR0605W: Thread "Proxy : 13" (000000f7) has been active
    for 746657 milliseconds and may be hung.  There is/are 1
    thread(s) in total in the server that may be hung.
    at java.lang.Thread.yield(Native Method)
    at com.ibm.ws.ssl.channel.impl.SSLUtils.flushCloseDown(
    SSLUtils.java:216)
    at com.ibm.ws.ssl.channel.impl.SSLUtils.shutDownSSLEngine(
    SSLUtils.java:119)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink.
    cleanupSSLConnectionLink.java:222)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink.
    close(SSLConnectionLink.java:167)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.
    close(HttpInboundLink.java:884)
    at com.ibm.ws.proxy.channel.http.HttpProxyConnectionLink.
    clearLink(HttpProxyConnectionLink.java:2188)
    

Problem conclusion

  • The SSL Channel was modified so that the closing handshake
    write is not thread blocking and to provide a timer to control
    for how long the channel will attempt to complete this write.
    A new custom property was added to the SSL Channel to enable
    the timer. The property name is
    "timeoutValueInSSLClosingHandshake" and accepts
    integer values to configure the amount to wait (in seconds)
    before giving up on completing the write. The default value for
    this property is -1, implying that the channel will wait
    indefinitely for the write to complete.
    
    
    For inbound connections, the custom property can be set on the
    SSL Channel configuration panel found here:
    
    
    Application Servers > {Server Name} > Web Container Transport
    Chains > {Chain Name} > {SSL Channel Name} > Custom Properties
    
    The fix for this APAR is currently targeted for inclusion in
    fix pack 8.5.5.10 and WebSphere Application Server version
    9.0.0.0 and fix pack 16.0.0.2 for WebSphere Liberty. Please
    refer to the Recommended Updates page for delivery
    information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

  • 
    

Comments

  • 
    

APAR Information

  • APAR number

    PI52696

  • 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

    2015-11-17

  • Closed date

    2016-06-23

  • Last modified date

    2016-06-23

  • 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

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

Document Information

Modified date:
12 October 2021