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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-22691] Incorrect initialization order in WiredTigerKVEngine</title>
                <link>https://jira.mongodb.org/browse/SERVER-22691</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.h#L169-L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;WiredTigerKVEngine&lt;/tt&gt;&lt;/a&gt;, an incorrect initialization order of private fields can lead to a race condition at shutdown. The KVEngine&apos;s &lt;tt&gt;SizeStorer&lt;/tt&gt; is depended on by the &lt;tt&gt;JournalFlusher&lt;/tt&gt; and so should be initialized beforehand to get the proper destruction order on shutdown.&lt;/p&gt;

&lt;p&gt;In addition, shutdown calls for components of the KVEngine in &lt;tt&gt;WiredTigerKVEngine::cleanShutdown()&lt;/tt&gt; should be reordered to match the actual order of destruction.&lt;/p&gt;</description>
                <environment></environment>
        <key id="266141">SERVER-22691</key>
            <summary>Incorrect initialization order in WiredTigerKVEngine</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="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>code-only</label>
                    </labels>
                <created>Wed, 17 Feb 2016 16:56:19 +0000</created>
                <updated>Sat, 19 Nov 2016 20:14:16 +0000</updated>
                            <resolved>Wed, 17 Feb 2016 18:38:49 +0000</resolved>
                                    <version>3.3.1</version>
                                    <fixVersion>3.2.4</fixVersion>
                    <fixVersion>3.3.3</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1176362" author="xgen-internal-githook" created="Wed, 17 Feb 2016 20:52:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;ksuarz@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22691&quot; title=&quot;Incorrect initialization order in WiredTigerKVEngine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22691&quot;&gt;&lt;del&gt;SERVER-22691&lt;/del&gt;&lt;/a&gt; change WiredTigerKVEngine init order&lt;/p&gt;

&lt;p&gt;The KVEngine&apos;s _journalFlusher depends on the _sizeStorer and so should be&lt;br/&gt;
initialized afterwards to prevent a use-after-free error on shutdown. The mutex&lt;br/&gt;
for _identToDrop should also initialized beforehand rather than after.&lt;/p&gt;

&lt;p&gt;In addition, shutdown calls to internal components in&lt;br/&gt;
WiredTigerKVEngine::cleanShutdown() should be ordered in a way that matches&lt;br/&gt;
their actual destruction order.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 95ca58f7396c1c4e1c5e54caa81dda875ca87b57)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/353875a593912ce454e9597f084d37bcebdc5df5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/353875a593912ce454e9597f084d37bcebdc5df5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1176077" author="xgen-internal-githook" created="Wed, 17 Feb 2016 18:31:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;ksuarz@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22691&quot; title=&quot;Incorrect initialization order in WiredTigerKVEngine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22691&quot;&gt;&lt;del&gt;SERVER-22691&lt;/del&gt;&lt;/a&gt; change WiredTigerKVEngine init order&lt;/p&gt;

&lt;p&gt;The KVEngine&apos;s _journalFlusher depends on the _sizeStorer and so should be&lt;br/&gt;
initialized afterwards to prevent a use-after-free error on shutdown. The mutex&lt;br/&gt;
for _identToDrop should also initialized beforehand rather than after.&lt;/p&gt;

&lt;p&gt;In addition, shutdown calls to internal components in&lt;br/&gt;
WiredTigerKVEngine::cleanShutdown() should be ordered in a way that matches&lt;br/&gt;
their actual destruction order.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/95ca58f7396c1c4e1c5e54caa81dda875ca87b57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/95ca58f7396c1c4e1c5e54caa81dda875ca87b57&lt;/a&gt;&lt;/p&gt;</comment>
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