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https://issues.apache.org/jira/browse/CASSANDRA-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16352058#comment-16352058
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Kurt Greaves commented on CASSANDRA-13873:
------------------------------------------

[~tsteinmaurer] I couldn't reproduce the issue on my end. I suspect you need at 
least a few large SSTables to trigger the issue. Can you try building from 
[this branch|https://github.com/kgreav/cassandra/tree/13873-2.1] which is just 
latest 2.1 with the simple backport on top and seeing if it fixes the issue?

> Ref bug in Scrub
> ----------------
>
>                 Key: CASSANDRA-13873
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13873
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: T Jake Luciani
>            Assignee: Marcus Eriksson
>            Priority: Major
>             Fix For: 2.2.12, 3.0.16, 3.11.2, 4.0
>
>
> I'm hitting a Ref bug when many scrubs run against a node.  This doesn't 
> happen on 3.0.X.  I'm not sure if/if not this happens with compactions too 
> but I suspect it does.
> I'm not seeing any Ref leaks or double frees.
> To Reproduce:
> {quote}
> ./tools/bin/cassandra-stress write n=10m -rate threads=100
> ./bin/nodetool scrub
> #Ctrl-C
> ./bin/nodetool scrub
> #Ctrl-C
> ./bin/nodetool scrub
> #Ctrl-C
> ./bin/nodetool scrub
> {quote}
> Eventually in the logs you get:
> WARN  [RMI TCP Connection(4)-127.0.0.1] 2017-09-14 15:51:26,722 
> NoSpamLogger.java:97 - Spinning trying to capture readers 
> [BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-5-big-Data.db'),
>  
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-32-big-Data.db'),
>  
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-31-big-Data.db'),
>  
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-29-big-Data.db'),
>  
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-27-big-Data.db'),
>  
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-26-big-Data.db'),
>  
> BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-20-big-Data.db')],
> *released: 
> [BigTableReader(path='/home/jake/workspace/cassandra2/data/data/keyspace1/standard1-2eb5c780998311e79e09311efffdcd17/mc-5-big-Data.db')],*
>  
> This released table has a selfRef of 0 but is in the Tracker



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