Hanging on DocumentsWriterStallControl.waitIfStalled forever

In an environment where our underlying storage was timing out on various operations, we find all of our indexing threads eventually stuck in the following state (so far for 4 days):

"Thread-0" daemon prio=5 Thread id=556 WAITING
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:503)
at org.apache.lucene.index.DocumentsWriterStallControl.waitIfStalled(DocumentsWriterStallControl.java:74)
at org.apache.lucene.index.DocumentsWriterFlushControl.waitIfStalled(DocumentsWriterFlushControl.java:676)
at org.apache.lucene.index.DocumentsWriter.preUpdate(DocumentsWriter.java:301)
at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:361)
at org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1484)
at ...

I have not yet enabled detail logging and tried to reproduce yet, but looking at the code, I see that DWFC.abortPendingFlushes does

try

{ dwpt.abort(); doAfterFlush(dwpt); }

catch (Throwable ex)

{ // ignore - keep on aborting the flush queue }

(and the same for the blocked ones). Since the throwable is ignored, I can't say for sure, but I've seen DWPT.abort thrown in other cases, so if it does throw, we'd fail to call doAfterFlush and properly decrement flushBytes. This can be a problem, right? Is it possible to do this instead:

try { dwpt.abort(); } catch (Throwable ex) { // ignore - keep on aborting the flush queue }

finally {
try

{ doAfterFlush(dwpt); }

catch (Throwable ex2)

{ // ignore - keep on aborting the flush queue }

}

It's ugly but safer. Otherwise, maybe at least add logging for the throwable just to make sure this is/isn't happening.