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https://issues.apache.org/jira/browse/LUCENE-6670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621259#comment-14621259
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Michael McCandless commented on LUCENE-6670:
--------------------------------------------
Thanks, this should be fixed by LUCENE-6579 ... I hit exactly the same deadlock
and fixed it there by having CMS.sync skip waiting on the calling thread.
> OOM error in merge causes deadlock
> ----------------------------------
>
> Key: LUCENE-6670
> URL: https://issues.apache.org/jira/browse/LUCENE-6670
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 5.2.1
> Reporter: Jeffrey Morlan
>
> Using the ConcurrentMergeScheduler, when merging catches an OutOfMemoryError
> and tries to rollback, the merge thread ends up calling Thread.join on
> itself, which will never complete.
> Stack trace (line numbers are for Lucene 5.2.1):
> {noformat}
> "Lucene Merge Thread #1" #356502 daemon prio=5 os_prio=0
> tid=0x00007f3f78622000 nid=0x11b5 in Object.wait() [0x00007f3e90528000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Thread.join(Thread.java:1245)
> - locked <0x00000001965aff78> (a
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread)
> at java.lang.Thread.join(Thread.java:1319)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.sync(ConcurrentMergeScheduler.java:420)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.close(ConcurrentMergeScheduler.java:401)
> at
> org.apache.lucene.index.IndexWriter.rollbackInternal(IndexWriter.java:1948)
> at org.apache.lucene.index.IndexWriter.rollback(IndexWriter.java:1921)
> - locked <0x00000001965b0100> (a java.lang.Object)
> at
> org.apache.lucene.index.IndexWriter.tragicEvent(IndexWriter.java:4439)
> - locked <0x00000001965b0100> (a java.lang.Object)
> at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3571)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:581)
> at
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:619)
> {noformat}
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