[jira] Updated: (TS-440) Traffic Server threads will spin under heavy load

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leif Hedstrom updated TS-440:
-----------------------------

    Fix Version/s: 2.1.3

> Traffic Server threads will spin under heavy load
> -------------------------------------------------
>
>                 Key: TS-440
>                 URL: https://issues.apache.org/jira/browse/TS-440
>             Project: Traffic Server
>          Issue Type: Bug
>          Components: Network
>            Reporter: Bryan Call
>            Assignee: Bryan Call
>             Fix For: 2.1.3
>
>
> This has been a problem for a long time.  I created a fix for the problem yesterday and tested it overnight.
> The problem is when we remove from the enabled lists in close_UnixNetVConnection().  We lock the lists when we add to them, but not when we remove the connection from them in close_UnixNetVConnection().  This can corrupt the data structure.
> Because the data structure is corrupted it can fail the empty() test in NetHandler::mainNetEvent() and poll_timeout (really epoll timeout) will set to 0 and the thread will spin.
> The read enabled list (Queue<>) will normally have a NULL head, but a non-NULL tail and the empty() test on the Queue<> checks for NULL head and NULL tail to be considered empty.

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