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https://issues.apache.org/jira/browse/TS-4935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leif Hedstrom updated TS-4935:
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Backport to Version: 6.2.1, 7.0.0
> Adding same element twice in a row damages DLL's structure silently
> -------------------------------------------------------------------
>
> Key: TS-4935
> URL: https://issues.apache.org/jira/browse/TS-4935
> Project: Traffic Server
> Issue Type: Bug
> Components: Core
> Reporter: Gancho Tenev
> Assignee: Gancho Tenev
> Fix For: 7.1.0
>
>
> If the DLL list (lib/ts/List.h) is used improperly its internal structure
> gets damaged silently without any indication to the caller (no assert or
> return code).
> If the the same element is added twice in a row the element's “next” would
> start pointing to the element itself and all the existing list content would
> be lost. All further additions will be OK but the next list traversal will be
> infinite.
> Also noticed that when a new element is added to the list the element’s
> “prev” is not initialized (not a problem in the most common case but should
> to be fixed).
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