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    <title>MongoDB Jira</title>
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    <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-47916] Out of order destruction of ValueHandles returned by InvalidatingLRUCache can break the invalidation guarantees</title>
                <link>https://jira.mongodb.org/browse/SERVER-47916</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The destructor of &lt;tt&gt;InvalidatingLRUCache::StoredValue&lt;/tt&gt; unconditionally &lt;a href=&quot;https://github.com/mongodb/mongo/blob/01583bbf5e0884c94dcb2545be47cc3104ccbd11/src/mongo/util/invalidating_lru_cache.h#L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;removes&lt;/a&gt; entries from the &lt;tt&gt;_evictedCheckedOutValues&lt;/tt&gt; map. This means it is possible that an old ValueHandle, which goes out of scope after a newer value for the same key has been evicted, will remove the newer value from that map. This in turn will prevent such a value from getting invalidated.&lt;/p&gt;

&lt;p&gt;The solution is to only erase from the &lt;tt&gt;_evictedCheckedOutValues&lt;/tt&gt; if the &lt;tt&gt;StoredValue&lt;/tt&gt; corresponds to the same epoch for the key.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1338755">SERVER-47916</key>
            <summary>Out of order destruction of ValueHandles returned by InvalidatingLRUCache can break the invalidation guarantees</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 May 2020 13:30:24 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:44 +0000</updated>
                            <resolved>Thu, 7 May 2020 06:30:14 +0000</resolved>
                                    <version>4.4.0-rc3</version>
                                    <fixVersion>4.4.0-rc7</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3089609" author="xgen-internal-githook" created="Fri, 15 May 2020 13:07:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47916&quot; title=&quot;Out of order destruction of ValueHandles returned by InvalidatingLRUCache can break the invalidation guarantees&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47916&quot;&gt;&lt;del&gt;SERVER-47916&lt;/del&gt;&lt;/a&gt; Make InvalidatingLRUCache use an &apos;epoch&apos; when invalidating evicted checked-out values&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 7ee768a17cbc78f42c8e8938df2c68635f871bdf)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3455ab4ba560647809b3ac49910b00ec19bfff85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3455ab4ba560647809b3ac49910b00ec19bfff85&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3073178" author="xgen-internal-githook" created="Thu, 7 May 2020 05:42:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47916&quot; title=&quot;Out of order destruction of ValueHandles returned by InvalidatingLRUCache can break the invalidation guarantees&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47916&quot;&gt;&lt;del&gt;SERVER-47916&lt;/del&gt;&lt;/a&gt; Make InvalidatingLRUCache use an &apos;epoch&apos; when invalidating evicted checked-out values&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7ee768a17cbc78f42c8e8938df2c68635f871bdf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7ee768a17cbc78f42c8e8938df2c68635f871bdf&lt;/a&gt;&lt;/p&gt;</comment>
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