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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-5509] Concurrency build hanging on background.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-5509</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://buildbot.mongodb.org/builders/Nightly%20Linux%2064-bit%20concurrency/builds/0/steps/test_1/logs/stdio&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://buildbot.mongodb.org/builders/Nightly%20Linux%2064-bit%20concurrency/builds/0/steps/test_1/logs/stdio&lt;/a&gt;&lt;/p&gt;</description>
                <environment>Nightly Linux 64-bit concurrency</environment>
        <key id="35544">SERVER-5509</key>
            <summary>Concurrency build hanging on background.js</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="ian@mongodb.com">Ian Whalen</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Apr 2012 13:06:26 +0000</created>
                <updated>Mon, 11 Jul 2016 18:35:50 +0000</updated>
                            <resolved>Thu, 5 Apr 2012 18:34:46 +0000</resolved>
                                                    <fixVersion>2.1.1</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="107083" author="auto" created="Thu, 5 Apr 2012 18:31:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4328&quot; title=&quot;db level locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4328&quot;&gt;&lt;del&gt;SERVER-4328&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5509&quot; title=&quot;Concurrency build hanging on background.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5509&quot;&gt;&lt;del&gt;SERVER-5509&lt;/del&gt;&lt;/a&gt; fix deadlock in runExclusively&lt;/p&gt;

&lt;p&gt;A deadlock was seen in slowNightly/background.js.&lt;br/&gt;
The dur thread was blocked waiting on X&apos;s condvar.&lt;br/&gt;
Meanwhile, another thread had finished its work and&lt;br/&gt;
released its w lock (rather than calling runExclusively);&lt;br/&gt;
however, the code does not signal X&apos;s condvar for that case,&lt;br/&gt;
and thus the dur thread never woke up to notice that X.n&lt;br/&gt;
and w.n counts were the same.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b987d96067b24e4d1eb6dede4c204f2dc0db8f57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b987d96067b24e4d1eb6dede4c204f2dc0db8f57&lt;/a&gt;&lt;/p&gt;</comment>
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