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https://issues.apache.org/jira/browse/SOLR-11512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211336#comment-16211336
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Yonik Seeley commented on SOLR-11512:
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Yes, dismax should not parse embedded different query types.
Part of edismax was meant to be a superset of the Lucene query parser, although
there should be a parameter to disable it.
> Query parsing should not loop forever with 100% cpu
> ---------------------------------------------------
>
> Key: SOLR-11512
> URL: https://issues.apache.org/jira/browse/SOLR-11512
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.1
> Reporter: Will Currie
> Priority: Minor
> Attachments: SOLR-11512.patch
>
>
> The following query against the techproducts example puts solr into an
> infinite loop:
> {noformat}
> curl -g -v
> 'http://localhost:8983/solr/techproducts/select?q=*&defType=edismax&qq={!edismax+v=something}&bq={!edismax+v=$qq}
> {noformat}
> Problem doesn't depend on the collection, just an easy example. I guess I'd
> expect a failure with "Infinite Recursion detected parsing query ..."
> instead. So depending on the query config a user typing {!edismax v=whatever}
> into a search box can send a solr instance to 100% cpu.
> I can reproduce using TestExtendedDismaxParser by adding:
> {code}
> @Test
> public void loopsForever() throws Exception {
> assertJQ(req("defType", "edismax", "q", "*", "qq", "{!edismax
> v=something}", "bq", "{!edismax v=$qq}"));
> }
> {code}
> The code seems to hit QParser.checkRecurse() and try to fail but something
> sends it around for another try. Repeat.
> Given the complexity of the parsing code there may well be other examples.
> There's no way to disable the local params syntax is there? Question was
> asked in SOLR-4197.
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