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https://issues.apache.org/jira/browse/SLING-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carsten Ziegeler resolved SLING-2966.
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Resolution: Fixed
Thanks for your patch Lars - I've applied a slightly modified version which
removes the additional (unneeded) syncing in revision 1503632
> Insufficient synchronization in SlingAuthenticator
> --------------------------------------------------
>
> Key: SLING-2966
> URL: https://issues.apache.org/jira/browse/SLING-2966
> Project: Sling
> Issue Type: Bug
> Components: Authentication
> Affects Versions: Auth Core 1.1.2
> Reporter: Lars Krapf
> Assignee: Carsten Ziegeler
> Labels: authentication, sling
> Fix For: Auth Core 1.1.4
>
> Attachments: sling_authenticator.patch
>
>
> In the serviceChanged method of SlingAuthenticator a service is removed and
> subsequently re-added in case of a modification event. This can lead to
> synchronization problems (e.g. remove, remove, add, add) if two threads
> trigger this handler at the same time (e.g. duplication of CUG roots in the
> holder-cache of the CQ CUG handler after activation of a page with alias).
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