Johannes Kloos created SOLR-13199:
-------------------------------------
Summary: NPE due to unexpected null return value from
QueryBitSetProducer.getBitSet
Key: SOLR-13199
URL: https://issues.apache.org/jira/browse/SOLR-13199
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: search
Affects Versions: master (9.0)
Environment: h1. Steps to reproduce
* Use a Linux machine.
* Build commit {{ea2c8ba}} of Solr as described in the section below.
* Build the films collection as described below.
* Start the server using the command {{./bin/solr start -f -p 8983 -s
/tmp/home}}
* Request the URL given in the bug description.
h1. Compiling the server
{noformat}
git clone https://github.com/apache/lucene-solr
cd lucene-solr
git checkout ea2c8ba
ant compile
cd solr
ant server
{noformat}
h1. Building the collection
We followed [Exercise
2|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html#exercise-2] from
the [Solr Tutorial|http://lucene.apache.org/solr/guide/7_5/solr-tutorial.html].
The attached file ({{home.zip}}) gives the contents of folder {{/tmp/home}}
that you will obtain by following the steps below:
{noformat}
mkdir -p /tmp/home
echo '<?xml version="1.0" encoding="UTF-8" ?><solr></solr>' > /tmp/home/solr.xml
{noformat}
In one terminal start a Solr instance in foreground:
{noformat}
./bin/solr start -f -p 8983 -s /tmp/home
{noformat}
In another terminal, create a collection of movies, with no shards and no
replication, and initialize it:
{noformat}
bin/solr create -c films
curl -X POST -H 'Content-type:application/json' --data-binary '{"add-field":
{"name":"name", "type":"text_general", "multiValued":false, "stored":true}}'
http://localhost:8983/solr/films/schema
curl -X POST -H 'Content-type:application/json' --data-binary
'{"add-copy-field" : {"source":"*","dest":"_text_"}}'
http://localhost:8983/solr/films/schema
./bin/post -c films example/films/films.json
{noformat}
Reporter: Johannes Kloos
Attachments: home.zip
Requesting the following URL causes Solr to return an HTTP 500 error response:
{noformat}
http://localhost:8983/solr/films/select?fl=[child%20parentFilter=ge]&q=*:*
{noformat}
The error response seems to be caused by the following uncaught exception:
{noformat}
java.lang.NullPointerException
at
org.apache.solr.response.transform.ChildDocTransformer.transform(ChildDocTransformer.java:92)
at org.apache.solr.response.DocsStreamer.next(DocsStreamer.java:103)
at org.apache.solr.response.DocsStreamer.next(DocsStreamer.java:1)
at
org.apache.solr.response.TextResponseWriter.writeDocuments(TextResponseWriter.java:184)
at
org.apache.solr.response.TextResponseWriter.writeVal(TextResponseWriter.java:136)
at
org.apache.solr.common.util.JsonTextWriter.writeNamedListAsMapWithDups(JsonTextWriter.java:386)
at
org.apache.solr.common.util.JsonTextWriter.writeNamedList(JsonTextWriter.java:292)
at org.apache.solr.response.JSONWriter.writeResponse(JSONWriter.java:73)
{noformat}
In ChildDocTransformer.transform, we have the following lines:
{noformat}
final BitSet segParentsBitSet = parentsFilter.getBitSet(leafReaderContext);
final int segPrevRootId = segRootId==0? -1:
segParentsBitSet.prevSetBit(segRootId - 1); // can return -1 and that's okay
{noformat}
But getBitSet can return null if the set of DocIds is empty:
{noformat}
return docIdSet == DocIdSet.EMPTY ? null : ((BitDocIdSet) docIdSet).bits();
{noformat}
We found this bug using [Diffblue Microservices
Testing|https://www.diffblue.com/labs/?utm_source=solr-br]. Find more
information on this [fuzz testing
campaign|https://www.diffblue.com/blog/2018/12/19/diffblue-microservice-testing-a-sneak-peek-at-our-early-product-and-results?utm_source=solr-br].
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