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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-31434] Give mongo::Value at least pointer alignment</title>
                <link>https://jira.mongodb.org/browse/SERVER-31434</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Value type holds pointers but currently has alignment of 1. Since LSAN by default only looks for pointers in aligned addresses, it can report false-positive leaks of memory pointed to by a misaligned Value. This will be fixed by giving Value at least pointer alignment.&lt;/p&gt;

&lt;p&gt;Original title: Use use_unaligned for LSAN&lt;/p&gt;

&lt;p&gt;Original Description:&lt;/p&gt;

&lt;p&gt;Pointers to the RCString class may be stored in memory not aligned to 8 bytes, and therefore LSAN does not mark the RCString as reachable. This results in false positive leak reports.&lt;/p&gt;

&lt;p&gt;To fix, pass &quot;use_unaligned=1&quot; in the LSAN_OPTIONS environment variable.&lt;/p&gt;

&lt;p&gt;See&lt;br/&gt;
&lt;a href=&quot;https://github.com/llvm-mirror/compiler-rt/blob/b3c632084941e7b9669416f91c7f90b7fcd49645/lib/lsan/lsan_common.cc#L160-L165&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/llvm-mirror/compiler-rt/blob/b3c632084941e7b9669416f91c7f90b7fcd49645/lib/lsan/lsan_common.cc#L160-L165&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/llvm-mirror/compiler-rt/blob/b3c632084941e7b9669416f91c7f90b7fcd49645/lib/lsan/lsan_common.h#L71-L73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/llvm-mirror/compiler-rt/blob/b3c632084941e7b9669416f91c7f90b7fcd49645/lib/lsan/lsan_common.h#L71-L73&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="441594">SERVER-31434</key>
            <summary>Give mongo::Value at least pointer alignment</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Oct 2017 14:14:06 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:01 +0000</updated>
                            <resolved>Mon, 16 Oct 2017 20:44:44 +0000</resolved>
                                                    <fixVersion>3.4.17</fixVersion>
                    <fixVersion>3.6.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1955218" author="xgen-internal-githook" created="Tue, 24 Jul 2018 15:35:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;, &apos;username&apos;: &apos;RedBeard0531&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31434&quot; title=&quot;Give mongo::Value at least pointer alignment&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31434&quot;&gt;&lt;del&gt;SERVER-31434&lt;/del&gt;&lt;/a&gt; Give Value and ValueStorage pointer alignment&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 068afad15322f6e768cafdfde76dfa92575a17cf)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/73d0465bb1f5a90a8fd8848da23434723c9dd7b6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/73d0465bb1f5a90a8fd8848da23434723c9dd7b6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1700249" author="redbeard0531" created="Mon, 16 Oct 2017 20:45:37 +0000"  >&lt;p&gt;Requesting backport to avoid false-positive LSAN leak errors in old branches&lt;/p&gt;</comment>
                            <comment id="1700240" author="xgen-internal-githook" created="Mon, 16 Oct 2017 20:38:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;mathias@10gen.com&apos;, &apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;username&apos;: &apos;RedBeard0531&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31434&quot; title=&quot;Give mongo::Value at least pointer alignment&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31434&quot;&gt;&lt;del&gt;SERVER-31434&lt;/del&gt;&lt;/a&gt; Give Value and ValueStorage pointer alignment&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/068afad15322f6e768cafdfde76dfa92575a17cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/068afad15322f6e768cafdfde76dfa92575a17cf&lt;/a&gt;&lt;/p&gt;</comment>
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