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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-26323] Evaluate correctness of GCC __atomics implementation in gperftools</title>
                <link>https://jira.mongodb.org/browse/SERVER-26323</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During earlier porting work, we forced GPerftools to use the GCC __atomic API rather than the per-architecture hand-rolled assembly. However, we have some indirect evidence gathered while investigating &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25956&quot; title=&quot;mongos crash in MessagingPort::recv on Ubuntu 16.04 PowerPC&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25956&quot;&gt;&lt;del&gt;SERVER-25956&lt;/del&gt;&lt;/a&gt; that the GCC implementation may not be functioning correctly. We should take a closer look at the GCC __atomics implementation, and potentially revert to the per-architecture files.&lt;/p&gt;</description>
                <environment></environment>
        <key id="318840">SERVER-26323</key>
            <summary>Evaluate correctness of GCC __atomics implementation in gperftools</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="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, 26 Sep 2016 15:33:53 +0000</created>
                <updated>Wed, 15 Mar 2017 02:45:26 +0000</updated>
                            <resolved>Wed, 15 Mar 2017 02:45:25 +0000</resolved>
                                                                    <component>Build</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1524245" author="xgen-internal-githook" created="Wed, 15 Mar 2017 02:43:26 +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: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26323&quot; title=&quot;Evaluate correctness of GCC __atomics implementation in gperftools&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26323&quot;&gt;&lt;del&gt;SERVER-26323&lt;/del&gt;&lt;/a&gt; Roll back to per-arch atomics in gperftools&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 4435e71c4e6ddef7086f626d87eb90315456b962.&lt;/p&gt;

&lt;p&gt;After making this change, we continued to observe the corruption&lt;br/&gt;
issues in the DEBUG builds, disconfirming the hypothesis that this&lt;br/&gt;
change would eliminate them. Reverting this change to restore the&lt;br/&gt;
prior configuration.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0a3d35d8d7ea33c268c4e32cd5c7f7d84305d45b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0a3d35d8d7ea33c268c4e32cd5c7f7d84305d45b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1515308" author="xgen-internal-githook" created="Fri, 3 Mar 2017 14:59:17 +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-26323&quot; title=&quot;Evaluate correctness of GCC __atomics implementation in gperftools&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26323&quot;&gt;&lt;del&gt;SERVER-26323&lt;/del&gt;&lt;/a&gt; Roll back to per-arch atomics in gperftools&lt;/p&gt;

&lt;p&gt;We suspect that the GCC based atomics in atomicops-internals-gcc.h&lt;br/&gt;
may not accurately implement the intended semantics of the functions&lt;br/&gt;
in the base::subtle API.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4435e71c4e6ddef7086f626d87eb90315456b962&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4435e71c4e6ddef7086f626d87eb90315456b962&lt;/a&gt;&lt;/p&gt;</comment>
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