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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-15899] Querying against path in document containing long array of subdocuments with nested arrays causes stack overflow</title>
                <link>https://jira.mongodb.org/browse/SERVER-15899</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of Dec 10, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
If a document contains a very large array &quot;&lt;tt&gt;arr&lt;/tt&gt;&quot; of subdocuments with nested arrays, a query against a path where many consecutive array elements of &quot;&lt;tt&gt;arr&lt;/tt&gt;&quot; do not match the query path may trigger a stack overflow inside &lt;tt&gt;mongod&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;For example:&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;   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;db.col.insert({arr: [{elem: []}, {elem: []}, {elem: []}, ...]})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;db.col.find({&quot;arr.elem.x&quot; : 0})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
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&lt;p/&gt; 
&lt;p&gt;In this example, the issue is triggered when the number of consecutive array elements that do not match the &lt;tt&gt;&quot;arr.elem.x&quot;&lt;/tt&gt; path is sufficiently large.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
MongoDB crashes with no information in the log files.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
There are no workarounds for this issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
MongoDB 2.6 versions up to 2.6.5 are affected by this issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;FIX VERSION&lt;/b&gt;&lt;br/&gt;
The fix is included in the 2.6.6 production release.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION DETAILS&lt;/b&gt;&lt;br/&gt;
Change BSONElementIterator::more() to not use a stack frame per array element traversed.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment></environment>
        <key id="166662">SERVER-15899</key>
            <summary>Querying against path in document containing long array of subdocuments with nested arrays causes stack overflow</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="9">Done</resolution>
                                        <assignee username="rassi">J Rassi</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Oct 2014 14:57:49 +0000</created>
                <updated>Mon, 11 Jul 2016 17:17:13 +0000</updated>
                            <resolved>Tue, 18 Nov 2014 20:32:50 +0000</resolved>
                                    <version>2.6.5</version>
                    <version>2.7.8</version>
                                    <fixVersion>2.6.6</fixVersion>
                    <fixVersion>2.8.0-rc1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="772114" author="xgen-internal-githook" created="Tue, 25 Nov 2014 07:49:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jrassi&apos;, u&apos;name&apos;: u&apos;Jason Rassi&apos;, u&apos;email&apos;: u&apos;rassi@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15899&quot; title=&quot;Querying against path in document containing long array of subdocuments with nested arrays causes stack overflow&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15899&quot;&gt;&lt;del&gt;SERVER-15899&lt;/del&gt;&lt;/a&gt; BSONElementIterator::more() shouldn&apos;t overflow stack&lt;/p&gt;

&lt;p&gt;BSONElementIterator::more() was using a stack frame per array&lt;br/&gt;
element traversed.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 20c218d3d3df17c820b9cd3e6399a2dec6755d94)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca4a498ce711e307fb350e42be197d58d340c1cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca4a498ce711e307fb350e42be197d58d340c1cc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="767301" author="xgen-internal-githook" created="Tue, 18 Nov 2014 20:32:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jrassi&apos;, u&apos;name&apos;: u&apos;Jason Rassi&apos;, u&apos;email&apos;: u&apos;rassi@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15899&quot; title=&quot;Querying against path in document containing long array of subdocuments with nested arrays causes stack overflow&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15899&quot;&gt;&lt;del&gt;SERVER-15899&lt;/del&gt;&lt;/a&gt; BSONElementIterator::more() shouldn&apos;t overflow stack&lt;/p&gt;

&lt;p&gt;BSONElementIterator::more() was using a stack frame per array&lt;br/&gt;
element traversed.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/20c218d3d3df17c820b9cd3e6399a2dec6755d94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/20c218d3d3df17c820b9cd3e6399a2dec6755d94&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="753534" author="bruce.lucas@10gen.com" created="Fri, 31 Oct 2014 15:08:45 +0000"  >&lt;p&gt;It doesn&apos;t seem to. I increased n to 100000 with no problem.&lt;/p&gt;</comment>
                            <comment id="753532" author="rassi@10gen.com" created="Fri, 31 Oct 2014 15:04:56 +0000"  >&lt;p&gt;Bruce, does this affect 2.4.12?&lt;/p&gt;</comment>
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