ayinresh commented on issue #15068:
URL: https://github.com/apache/lucene/issues/15068#issuecomment-3210953067
Heads up that there may be other issues with `RefCountedSharedArena`. On
10.2.2, we hit an infinite loop at the following stacktrace:
```
java.lang.Thread.State: RUNNABLE
at
org.apache.lucene.store.RefCountedSharedArena.close(RefCountedSharedArena.java:123)
at
org.apache.lucene.store.MemorySegmentIndexInput.close(MemorySegmentIndexInput.java:702)
at org.apache.lucene.util.IOUtils.close(IOUtils.java:85)
at org.apache.lucene.util.IOUtils.close(IOUtils.java:72)
at
org.apache.lucene.codecs.lucene90.Lucene90CompoundReader.close(Lucene90CompoundReader.java:150)
at org.apache.lucene.util.IOUtils.close(IOUtils.java:85)
at org.apache.lucene.util.IOUtils.close(IOUtils.java:72)
at
org.apache.lucene.index.SegmentCoreReaders.decRef(SegmentCoreReaders.java:172)
at org.apache.lucene.index.SegmentReader.doClose(SegmentReader.java:223)
at org.apache.lucene.index.IndexReader.decRef(IndexReader.java:258)
at
org.apache.lucene.index.StandardDirectoryReader$$Lambda/0x0000000080e0cd48.accept(Unknown
Source)
at org.apache.lucene.util.IOUtils.lambda$applyToAll$0(IOUtils.java:467)
at org.apache.lucene.util.IOUtils$$Lambda/0x0000000080e03c20.close(Unknown
Source)
at org.apache.lucene.util.IOUtils.close(IOUtils.java:85)
at org.apache.lucene.util.IOUtils.applyToAll(IOUtils.java:466)
at
org.apache.lucene.index.StandardDirectoryReader.doClose(StandardDirectoryReader.java:482)
at org.apache.lucene.index.IndexReader.decRef(IndexReader.java:258)
at
org.apache.lucene.search.SearcherManager.decRef(SearcherManager.java:136)
at org.apache.lucene.search.SearcherManager.decRef(SearcherManager.java:52)
at
org.apache.lucene.search.ReferenceManager.release(ReferenceManager.java:264)
at
org.apache.lucene.search.ReferenceManager.swapReference(ReferenceManager.java:57)
- locked <0x00000403f312ef18> (a org.apache.lucene.search.SearcherManager)
at
org.apache.lucene.search.ReferenceManager.close(ReferenceManager.java:139)
- locked <0x00000403f312ef18> (a org.apache.lucene.search.SearcherManager)
```
It appears that `MemorySegmentIndexInput` repeatedly tries to close the
`RefCountedSharedArena`
[here](https://github.com/apache/lucene/blob/32e97a6f66157a98f35ba98d983ad0d5eb5de4b9/lucene/core/src/java/org/apache/lucene/store/MemorySegmentIndexInput.java#L718),
but `RefCountedSharedArena` always fails
[here](https://github.com/apache/lucene/blob/b1c1770e8052a74fd30e3520e4fd662e2724bd1c/lucene/core/src/java/org/apache/lucene/store/RefCountedSharedArena.java#L107).
The effect is that closing the searcher blocks indefinitely. We discovered
this as a root cause of a production outage this morning, so I haven't had time
to read up fully on this code / thread, and apologies for not providing more
context here. Planning on doing a more detailed writeup and filing as a
separate issue.
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