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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-79161] Deeply nested queries can segfault expression parser</title>
                <link>https://jira.mongodb.org/browse/SERVER-79161</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Details in dev-only comment below.&lt;/p&gt;

&lt;p&gt;The depth limit for a query appears to be implicit in BSON, rather than enforced on the server side. We could add an explicit limit, or fix the expression parsing code (and other code that may crash later on in the system for this query) to not crash.&lt;/p&gt;

&lt;p&gt;This recursive parsing code has been around for a while so this isn&apos;t a 7.0 specific bug.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2397199">SERVER-79161</key>
            <summary>Deeply nested queries can segfault expression parser</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                            <label>query-director-triage</label>
                    </labels>
                <created>Thu, 20 Jul 2023 17:21:40 +0000</created>
                <updated>Thu, 27 Jul 2023 15:22:30 +0000</updated>
                            <resolved>Thu, 27 Jul 2023 01:34:44 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5595743" author="JIRAUSER1253388" created="Thu, 27 Jul 2023 15:22:30 +0000"  >&lt;p&gt;The plan is to recommit this test (it was reverted) and have it bail out if debug is on or sanitizers are on.&lt;/p&gt;</comment>
                            <comment id="5594265" author="JIRAUSER1253388" created="Thu, 27 Jul 2023 01:34:44 +0000"  >&lt;p&gt;Won&apos;t fix as this is specific to ASAN and doesn&apos;t occur on standard builds.&lt;/p&gt;</comment>
                            <comment id="5583573" author="jacob.evans" created="Fri, 21 Jul 2023 18:32:21 +0000"  >&lt;p&gt;I believe this may be ASAN which is togglable independent of building with debug info or optimization level.&lt;/p&gt;</comment>
                            <comment id="5583346" author="JIRAUSER1253388" created="Fri, 21 Jul 2023 17:09:35 +0000"  >&lt;p&gt;I&apos;d like this test to bail out if we see buildInfo.debug is on. We only really care about testing the optimized builds. The debug builds have had a few BFs already and isn&apos;t the target case for this test anyway.&lt;/p&gt;</comment>
                            <comment id="5581471" author="jacob.evans" created="Thu, 20 Jul 2023 21:47:39 +0000"  >&lt;p&gt;ASAN is likely to make them much larger.&lt;/p&gt;</comment>
                            <comment id="5581312" author="JIRAUSER1253388" created="Thu, 20 Jul 2023 20:49:36 +0000"  >&lt;p&gt;Maybe the solution is to lower the depth on this test when debug is on, if the larger stack frames from debug=on is the cause of this.&lt;/p&gt;</comment>
                            <comment id="5581303" author="JIRAUSER1253388" created="Thu, 20 Jul 2023 20:44:57 +0000"  >&lt;p&gt;Could the issue be that BF-29371 has debug and ASAN on? The limit I ran into when constructing this query was in json object to BSON conversion:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Exceeded depth limit of &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;150&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; when converting js object to BSON. Do you have a cycle?&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The depth that succeeded locally is around 144. Do you know where the BSON depth check is in the server?&lt;/p&gt;</comment>
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            <issuekey id="1961583">SERVER-62509</issuekey>
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