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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-14855] RACECHECK is full of races and should be removed</title>
                <link>https://jira.mongodb.org/browse/SERVER-14855</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The RACECHECK macro introduces a function scoped static object of type race::Block in an attempt to detect races. However, prior to C++11, initialization of function scoped statics is not thread-safe, so there is no guarantee that the Block object is properly constructed by the first thread before another reads from it, nor is there any assurance that the Block object won&apos;t be constructed twice.&lt;/p&gt;

&lt;p&gt;Furthermore, the implementation of race::Block uses a volatile int to attempt to track accesses, but does not use atomics or fences to ensure load/store ordering and write visibility, so introduces races of its own.&lt;/p&gt;

&lt;p&gt;RACECHECK cannot portably work as advertised, so we should remove it. If we want to detect races, we should use a modern race detector like ThreadSanitizer, DRD, Helgrind, etc.&lt;/p&gt;</description>
                <environment></environment>
        <key id="151898">SERVER-14855</key>
            <summary>RACECHECK is full of races and should be removed</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="9">Done</resolution>
                                        <assignee username="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Aug 2014 18:34:00 +0000</created>
                <updated>Mon, 18 Aug 2014 20:44:02 +0000</updated>
                            <resolved>Tue, 12 Aug 2014 17:34:25 +0000</resolved>
                                                    <fixVersion>2.7.5</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="688349" author="xgen-internal-githook" created="Tue, 12 Aug 2014 17:34:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14855&quot; title=&quot;RACECHECK is full of races and should be removed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14855&quot;&gt;&lt;del&gt;SERVER-14855&lt;/del&gt;&lt;/a&gt; Remove RACECHECK and race.h; they introduce races&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fae7c52d21cacdc97c898d17b95e4322f8a9bb87&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fae7c52d21cacdc97c898d17b95e4322f8a9bb87&lt;/a&gt;&lt;/p&gt;</comment>
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