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From "Will Currie (JIRA)" <>
Subject [jira] [Created] (SOLR-11512) Query parsing should not loop forever with 100% cpu
Date Thu, 19 Oct 2017 01:04:00 GMT
Will Currie created SOLR-11512:

             Summary: Query parsing should not loop forever with 100% cpu
                 Key: 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

The following query against the techproducts puts solr into an infinite loop:

curl -g -v 'http://localhost:8983/solr/techproducts/select?q=*&defType=edismax&qq={!edismax+v=something}&bq={!edismax+v=$qq}

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:
  public void loopsForever() throws Exception {
    assertJQ(req("defType", "edismax", "q", "*", "qq", "{!edismax v=something}", "bq", "{!edismax

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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