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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47642] Investigate adding an assertion that a snapshot is not already held before acquiring an exclusive collection lock </title>
                <link>https://jira.mongodb.org/browse/SERVER-47642</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a class of bugs that involves acquiring a Collection X lock, while already holding a storage snapshot, potentially because a global lock is already held and a prior read occurred. This violates assumptions that the owner of the Collection X lock makes, which is that all writes are visible, even though they may not. These lock acquisitions should be preceded by an &lt;tt&gt;abandonSnapshot()&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;It would be interesting to add an invariant that a snapshot is is not already held while acquiring a collection X lock to evaluate whether these bugs already exist.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1319819">SERVER-47642</key>
            <summary>Investigate adding an assertion that a snapshot is not already held before acquiring an exclusive collection lock </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="13201">Fixed</resolution>
                                        <assignee username="brian.deleonardis@mongodb.com">Brian DeLeonardis</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>newgrad</label>
                    </labels>
                <created>Fri, 17 Apr 2020 20:29:26 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:18 +0000</updated>
                            <resolved>Thu, 15 Oct 2020 18:35:58 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3447070" author="xgen-internal-githook" created="Thu, 15 Oct 2020 18:34:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Brian DeLeonardis&apos;, &apos;email&apos;: &apos;brian.deleonardis@mongodb.com&apos;, &apos;username&apos;: &apos;bdeleonardis1&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47642&quot; title=&quot;Investigate adding an assertion that a snapshot is not already held before acquiring an exclusive collection lock &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47642&quot;&gt;&lt;del&gt;SERVER-47642&lt;/del&gt;&lt;/a&gt; Ensure no active snapshot before acquiring collection X lock&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bef72de45709f2e1e6874e9b5f29a01e3fa8c413&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bef72de45709f2e1e6874e9b5f29a01e3fa8c413&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3445332" author="brian.deleonardis" created="Wed, 14 Oct 2020 22:41:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://mongodbcr.appspot.com/677140001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/677140001/&lt;/a&gt;&lt;/p&gt;</comment>
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