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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-50240] Make CurOp::_numYields atomic</title>
                <link>https://jira.mongodb.org/browse/SERVER-50240</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &apos;_numYields&apos; field gets updated in a single thread, but other threads can read it via $currentOp. These reads can trigger appear as data races in TSAN and are technically undefined behavior. Making &apos;_numYields&apos; atomic silences the TSAN errors and gives us reasonable behavior for the purposes of $currentOp.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1437564">SERVER-50240</key>
            <summary>Make CurOp::_numYields atomic</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="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                            <label>qexec-team</label>
                            <label>thread-sanitizer</label>
                    </labels>
                <created>Mon, 10 Aug 2020 22:47:47 +0000</created>
                <updated>Sun, 29 Oct 2023 22:04:35 +0000</updated>
                            <resolved>Wed, 12 Aug 2020 05:17:24 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3334366" author="acm" created="Wed, 12 Aug 2020 13:03:22 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=justin.seyster&quot; class=&quot;user-hover&quot; rel=&quot;justin.seyster&quot;&gt;justin.seyster&lt;/a&gt;, agreed. Very close. There are three active TSAN build failures that we are tracking before we can expand coverage beyond just &lt;tt&gt;jsCore&lt;/tt&gt;.&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49371&quot; title=&quot;Introduce the InlineRecursiveCountingExecutor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49371&quot;&gt;&lt;del&gt;SERVER-49371&lt;/del&gt;&lt;/a&gt;, which only affects unit tests, and has an LGTM&apos;d code review so should go in soon.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49874&quot; title=&quot;Make the server to be able to run JavaScript functions with ThreadSanitizer instrumentation (TSAN)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49874&quot;&gt;&lt;del&gt;SERVER-49874&lt;/del&gt;&lt;/a&gt;, also in code review but needs a little more work, hopefully landing soon. We can&apos;t suppress our way out of it though, so this is maybe the biggest blocker.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48490&quot; title=&quot;Destroy the ServiceContext on clean shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48490&quot;&gt;&lt;del&gt;SERVER-48490&lt;/del&gt;&lt;/a&gt;, no motion towards a solution yet, but in the worst case we can suppress the report.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks for getting the &lt;tt&gt;CurOp&lt;/tt&gt; issues sorted out.&lt;/p&gt;</comment>
                            <comment id="3334076" author="justin.seyster" created="Wed, 12 Aug 2020 05:17:24 +0000"  >&lt;p&gt;I think we&apos;re really close on TSAN now. The only failure in my patch build was the map-reduce recursion one.&lt;/p&gt;</comment>
                            <comment id="3334025" author="xgen-internal-githook" created="Wed, 12 Aug 2020 02:13:58 +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-50240&quot; title=&quot;Make CurOp::_numYields atomic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50240&quot;&gt;&lt;del&gt;SERVER-50240&lt;/del&gt;&lt;/a&gt; Make CurOp::_numYields atomic&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fa9e65944ee087a2e86341892311c6c630a8a9e3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fa9e65944ee087a2e86341892311c6c630a8a9e3&lt;/a&gt;&lt;/p&gt;</comment>
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