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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-25112] mapReduce segmentation fault on v3.3.9 unoptimized builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-25112</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The above steps cause a segmentation fault on 3.3.9 when running the map reduce command.  I have not investigated enough to know the specific cause, but the culprit seems to be a null pointer dereference from within the js runtime.&lt;/p&gt;

&lt;p&gt;The segfault seems to occur most often when the map reduce command is the first query run on the collection after the server is started.  Both WT and mmap are affected.  This issue occurs on unoptimized builds.  I encountered it on clang version 7.3.0.&lt;/p&gt;</description>
                <environment></environment>
        <key id="301515">SERVER-25112</key>
            <summary>mapReduce segmentation fault on v3.3.9 unoptimized builds</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="david.hatch">David Hatch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Jul 2016 18:12:34 +0000</created>
                <updated>Tue, 6 Dec 2022 04:21:20 +0000</updated>
                            <resolved>Fri, 19 Aug 2016 14:54:49 +0000</resolved>
                                    <version>3.3.9</version>
                                                    <component>MapReduce</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1325704" author="david.hatch" created="Fri, 15 Jul 2016 18:54:52 +0000"  >&lt;p&gt;I confirmed that this cannot be reproduced with &lt;tt&gt;--opt=on&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="1325663" author="david.hatch" created="Fri, 15 Jul 2016 18:29:12 +0000"  >&lt;p&gt;I&apos;ve attached the trace. I think this is likely related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23888&quot; title=&quot;Unoptimized builds on OSX overflow the stack&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23888&quot;&gt;SERVER-23888&lt;/a&gt; from the stack trace, as I&apos;ve compiled with &lt;tt&gt;--opt=off --dbg=on&lt;/tt&gt;.  I&apos;ll double check to see if I can reproduce with optimizations on.&lt;/p&gt;</comment>
                            <comment id="1325648" author="acm" created="Fri, 15 Jul 2016 18:18:19 +0000"  >&lt;p&gt;Does the crash come with a stack trace?&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="281894">SERVER-23888</issuekey>
        </issuelink>
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                <attachments>
                            <attachment id="130932" name="SERVER-25112-trace.txt" size="15299" author="david.hatch" created="Fri, 15 Jul 2016 18:26:54 +0000"/>
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                            <customfieldvalue>&lt;p&gt;1. Start a 3.3.9 mongod on an empty dbpath.&lt;br/&gt;
2. Run &lt;tt&gt;db.t.insert({a: 1})&lt;/tt&gt;&lt;br/&gt;
3. Execute: &lt;tt&gt;db.runCommand({mapReduce: &quot;t&quot;, map: function() { }, reduce: function () { }, out: &quot;a&quot;})&lt;/tt&gt;.&lt;br/&gt;
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