[SLING-4981] Deadlock involving Scheduler Whiteboard

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Commons Scheduler 2.4.6
• Fix Version/s: Commons Scheduler 2.4.12
• Component/s: Commons
• Assignee: Julian Sedding
• Reporter: Julian Sedding
• Created: 01/Sep/15 08:31
• Updated: 14/Dec/15 21:24
• Resolved: 04/Sep/15 13:41

Description

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.