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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-36676] Back SpinLock with a stdx::mutex in debug builds on non-windows</title>
                <link>https://jira.mongodb.org/browse/SERVER-36676</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have some lovely deadlock detection code built into the hang analyzer on linux which does a great job with our internal lock types as well as with mutexes.  For debug builds, backing SpinLock&apos;s with mutexes gives us that deadlock detection for free.&lt;/p&gt;

&lt;p&gt;This constrains them from being released on a different thread, but critical sections already have that property, so we can&apos;t have been relying on it&lt;/p&gt;</description>
                <environment></environment>
        <key id="588581">SERVER-36676</key>
            <summary>Back SpinLock with a stdx::mutex in debug builds on non-windows</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Aug 2018 23:09:39 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:56 +0000</updated>
                            <resolved>Tue, 21 Aug 2018 15:25:31 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1981294" author="xgen-internal-githook" created="Tue, 21 Aug 2018 15:25:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Carey&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;username&apos;: &apos;hanumantmk&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36676&quot; title=&quot;Back SpinLock with a stdx::mutex in debug builds on non-windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36676&quot;&gt;&lt;del&gt;SERVER-36676&lt;/del&gt;&lt;/a&gt; spinlock as mutex in dbg builds linux&lt;/p&gt;

&lt;p&gt;We have some lovely deadlock detection code built into the hang analyzer&lt;br/&gt;
on linux which does a great job with our internal lock types as well as&lt;br/&gt;
with mutexes. For debug builds, backing SpinLock&apos;s with mutexes gives us&lt;br/&gt;
that deadlock detection for free.&lt;/p&gt;

&lt;p&gt;This constrains them from being released on a different thread, but&lt;br/&gt;
critical sections already have that property, so we can&apos;t have been&lt;br/&gt;
relying on it.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5fd0cd67b6eabb44fbaa00a0b202eb17f7b09f8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5fd0cd67b6eabb44fbaa00a0b202eb17f7b09f8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1978234" author="xgen-internal-githook" created="Thu, 16 Aug 2018 22:54:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;username&apos;: &apos;visualzhou&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36676&quot; title=&quot;Back SpinLock with a stdx::mutex in debug builds on non-windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36676&quot;&gt;&lt;del&gt;SERVER-36676&lt;/del&gt;&lt;/a&gt; spinlock as mutex in dbg builds linux&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit db1535d7e9094fd444609ade9bf0fb725d611f85.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/57be1f7097ceed41b156a826c541aa276f35dd61&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/57be1f7097ceed41b156a826c541aa276f35dd61&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1978013" author="xgen-internal-githook" created="Thu, 16 Aug 2018 21:01:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jason Carey&apos;, &apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;username&apos;: &apos;hanumantmk&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36676&quot; title=&quot;Back SpinLock with a stdx::mutex in debug builds on non-windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36676&quot;&gt;&lt;del&gt;SERVER-36676&lt;/del&gt;&lt;/a&gt; spinlock as mutex in dbg builds linux&lt;/p&gt;

&lt;p&gt;We have some lovely deadlock detection code built into the hang analyzer&lt;br/&gt;
on linux which does a great job with our internal lock types as well as&lt;br/&gt;
with mutexes. For debug builds, backing SpinLock&apos;s with mutexes gives us&lt;br/&gt;
that deadlock detection for free.&lt;/p&gt;

&lt;p&gt;This constrains them from being released on a different thread, but&lt;br/&gt;
critical sections already have that property, so we can&apos;t have been&lt;br/&gt;
relying on it.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/db1535d7e9094fd444609ade9bf0fb725d611f85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/db1535d7e9094fd444609ade9bf0fb725d611f85&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="587848">SERVER-36628</issuekey>
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