race between RS shutdown thread and openregionhandler causes region to get stuck

2013-01-22 17:59:03,237 INFO [Shutdown of org.apache.hadoop.hbase.fs.HFileSystem@5984cf08] hbase.MiniHBaseCluster$SingleFileSystemShutdownThread(186): Hook closing fs=org.apache.hadoop.hbase.fs.HFileSystem@5984cf08
...
2013-01-22 17:59:03,411 DEBUG [RS_OPEN_REGION-10.11.2.92,50661,1358906192942-0] regionserver.HRegion(1001): Closing IntegrationTestRebalanceAndKillServersTargeted,66666660,1358906196709.0200b366bc37c5afd1185f7d487c7dfb.: disabling compactions & flushes
2013-01-22 17:59:03,411 DEBUG [RS_OPEN_REGION-10.11.2.92,50661,1358906192942-0] regionserver.HRegion(1023): Updates disabled for region IntegrationTestRebalanceAndKillServersTargeted,66666660,1358906196709.0200b366bc37c5afd1185f7d487c7dfb.
2013-01-22 17:59:03,415 ERROR [RS_OPEN_REGION-10.11.2.92,50661,1358906192942-0] executor.EventHandler(205): Caught throwable while processing event M_RS_OPEN_REGION
java.io.IOException: java.io.IOException: java.io.IOException: Filesystem closed
at org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:1058)
at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:974)
at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:945)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.cleanupFailedOpen(OpenRegionHandler.java:459)
at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:143)
at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:202)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

tryTransitionFromOpeningToFailedOpen or transitionToOpened below is never called and region can get stuck.
As an added benefit, the meta is already written by that time.