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https://issues.apache.org/jira/browse/SLING-4981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14725057#comment-14725057
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Carsten Ziegeler commented on SLING-4981:
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I suggest you give it a try with removing the "synchronized" for the three
methods in the ServiceTrackerCustomizer implementation and see what happens. I
don't think these really need to be sync'ed
> Deadlock involving Scheduler Whiteboard
> ---------------------------------------
>
> Key: SLING-4981
> URL: https://issues.apache.org/jira/browse/SLING-4981
> Project: Sling
> Issue Type: Bug
> Components: Commons
> Affects Versions: Commons Scheduler 2.4.6
> Reporter: Julian Sedding
> Attachments: scheduler-scr-deadlock.log
>
>
> I repeatedly observed a deadlock situation in an AEM 6.1 installation
> (involving custom code).
> The result, amongst others, is a blocked SCR Actor thread.
> Hypothesis: I suspect that this can occur in situations where a scheduled Job
> (A) has a reference to another SCR component (B) that is lazily initialized
> (immediate=false) and itself registered via the whiteboard. If A is disabled
> while B is being added by the Scheduler, this triggers deregistration of B as
> well.
> [~cziegeler] could you please take a look at the attached thread-dump?
> Several subsequent thread-dumps showed no progress. I would appreciate your
> opinion on this.
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