Mikhail Khludnev commented on SOLR-12155:

Attaching a sort of solution [^SOLR-12155.patch]. At least it unlocks 
concurrently loading thread, for the price of repeating hopeless initialisation 
attempts or causing NPE in calling code. After test injection is switched on, 
UIF is successfully initialised with the single instance. Is there any vetoes 
or votes?   

> Solr 7.2.1 deadlock in UnInvertedField.getUnInvertedField() 
> ------------------------------------------------------------
>                 Key: SOLR-12155
>                 URL: https://issues.apache.org/jira/browse/SOLR-12155
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 7.2.1
>            Reporter: Kishor gandham
>            Priority: Major
>         Attachments: SOLR-12155.patch, SOLR-12155.patch, stack.txt
> I am attaching a stack trace from our production Solr (7.2.1). Occasionally, 
> we are seeing SOLR becoming unresponsive. We are then forced to kill the JVM 
> and start solr again.
> We have a lot of facet queries and our index has approximately 15 million 
> documents. We have recently started using json.facet queries and some of the 
> facet fields use DocValues.

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