Applies To:

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sol14058: TMM CPU utilization may spike when using an iRule with the 'table add' command
Known IssueKnown Issue

Original Publication Date: 12/11/2012
Updated Date: 05/27/2016

Known Issue

TMM CPU utilization may spike when using an iRule with the table add command.

This issue occurs when all of the following conditions are met:

  • The virtual server contains the following configuration:

    • A Client SSL profile with Client Certificate set to require
    • An iRule uses the table add command within a CLIENTSSL_CLIENTCERT event:

      table add key value
  • The client presents an invalid SSL client certificate


This behavior may result in TMM dumping core and restarting.


As a result of this issue, you may encounter the following symptoms:

  • BIG-IP iHealth lists Heuristic H380104 on the Diagnostics > Identified > Medium screen.
  • Unusually high TMM CPU usage
  • TMM core dumps and restarts



F5 Product Development has assigned ID 374923 to this issue, and has confirmed that this issue exists in the products listed in the Applies To box. For information about releases or hotfixes that resolve this issue, refer to the following table:

Type of FixVersions FixedRelated Articles
Release11.3.0SOL2200: Most recent versions of F5 software
Hotfix10.2.4 HF5SOL9502: BIG-IP hotfix matrix


To work around this issue, you can modify the iRule to verify that the client certificate is valid before running the table add command.

Impact of workaround: iRule logic will need to be evaluated and implemented.

For more information about the CLIENTSSL_CLIENTCERT event or the table command, refer to the following DevCentral articles:

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