Develop a distributed GC for Managed X10 to garbage-collect objects remotely referenced by GlobalRefs.
If you get a chance, speak to Martin Hirzel. A few years ago he devised a high-level scheme for this problem.
Sorry, we have already implemented the fix.
Details will be presented in X10'12.
Fixed by r23714.
Details will be presented in a paper "Distributed Garbage Collection for Managed X10" in ACM SIGPLAN 2012 X10 Workshop, June 2012.