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In the attachment there is full dump stack.
Created attachment 798 [details] Full dump stack
Lookup problem?
ProxyLookup was synchronized in a very strict way, it did calls to proxied lookups in its synchronized lock, which could result in deadlocks. Now the ProxyLookup.R.allInstances method is synchronized in better way.
Target milestone 3.2
Resolved for 3.4.x or earlier, no new info since then -> closing.