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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-78477] Long aggregation pipelines can segfault SBE</title>
                <link>https://jira.mongodb.org/browse/SERVER-78477</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The query below segfaults in SBE stagebuilders. This appears to be a stack overflow.&lt;/p&gt;

&lt;p&gt;Note that the pipeline length limit is 1000 for non-debug builds. The minimum pipeline length that reproduces this crash appears to be 400 stages. I ran into this with optimizations on and debug off.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2378341">SERVER-78477</key>
            <summary>Long aggregation pipelines can segfault SBE</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="13201">Fixed</resolution>
                                        <assignee username="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                    </labels>
                <created>Tue, 27 Jun 2023 16:28:14 +0000</created>
                <updated>Sun, 29 Oct 2023 21:19:29 +0000</updated>
                            <resolved>Wed, 2 Aug 2023 23:36:58 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5606566" author="xgen-internal-githook" created="Wed, 2 Aug 2023 04:13:19 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78477&quot; title=&quot;Long aggregation pipelines can segfault SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78477&quot;&gt;&lt;del&gt;SERVER-78477&lt;/del&gt;&lt;/a&gt; Limit depth of SBE query plans created for pipeline execution&lt;/p&gt;

&lt;p&gt;There is also some refactoring included to reduce stack sizes so that&lt;br/&gt;
the depth limit can be higher:&lt;br/&gt;
  1) refactor the buildGroup stage builder so that it has a smaller&lt;br/&gt;
  stack frame, and&lt;br/&gt;
  2) use C-style function pointers for the stage builder function&lt;br/&gt;
  table instead of std::function objects, because std::invoke (needed&lt;br/&gt;
  to call the std::function member functions) adds extra strack frames&lt;br/&gt;
  at every level of recursion.&lt;br/&gt;
Branch: minh.luu-no_compile_sys-perf&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8be924637abcbca1510378f0617f7f7d93eae3fc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8be924637abcbca1510378f0617f7f7d93eae3fc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5603846" author="xgen-internal-githook" created="Tue, 1 Aug 2023 03:47:57 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78477&quot; title=&quot;Long aggregation pipelines can segfault SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78477&quot;&gt;&lt;del&gt;SERVER-78477&lt;/del&gt;&lt;/a&gt; Limit depth of SBE query plans created for pipeline execution&lt;/p&gt;

&lt;p&gt;There is also some refactoring included to reduce stack sizes so that&lt;br/&gt;
the depth limit can be higher:&lt;br/&gt;
  1) refactor the buildGroup stage builder so that it has a smaller&lt;br/&gt;
  stack frame, and&lt;br/&gt;
  2) use C-style function pointers for the stage builder function&lt;br/&gt;
  table instead of std::function objects, because std::invoke (needed&lt;br/&gt;
  to call the std::function member functions) adds extra strack frames&lt;br/&gt;
  at every level of recursion.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8be924637abcbca1510378f0617f7f7d93eae3fc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8be924637abcbca1510378f0617f7f7d93eae3fc&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1961583">SERVER-62509</issuekey>
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