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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-27411] session cache concurrency issues at shutdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-27411</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At shutdown time, after acquiring a Global X lock, shutdownTask() calls shutdownGlobalStorageEngineCleanly().  On WiredTiger, this calls __conn_close(), which proceeds to close all open sessions.&lt;/p&gt;

&lt;p&gt;Problematically, the destructor for ScopedTransaction calls abandonSnapshot(), which calls _txnClose().  _txnClose accesses a session, managed by the WiredTigerSessionCache.  Because no DB locks are held by ScopedTransaction, accessing sessions in ScopedTransaction by threads other than the one in shutdownTask() can race with the closing of these sessions by the WT shutdown code.  This can possibly result in a null pointer exception at shutdown time.&lt;/p&gt;</description>
                <environment></environment>
        <key id="338607">SERVER-27411</key>
            <summary>session cache concurrency issues at shutdown</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Dec 2016 20:49:22 +0000</created>
                <updated>Wed, 6 Dec 2017 21:12:00 +0000</updated>
                            <resolved>Wed, 23 Aug 2017 02:03:47 +0000</resolved>
                                                    <fixVersion>3.5.12</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1655972" author="ramon.fernandez" created="Thu, 24 Aug 2017 13:45:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;dgottlieb&apos;, &apos;name&apos;: u&apos;Daniel Gottlieb&apos;, &apos;email&apos;: u&apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27411&quot; title=&quot;session cache concurrency issues at shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27411&quot;&gt;&lt;del&gt;SERVER-27411&lt;/del&gt;&lt;/a&gt;: Abandon snapshots before locks are released.&lt;/p&gt;

&lt;p&gt;The storage engine may only be accessed by clients holding the Global lock in&lt;br/&gt;
at least MODE_IS. Otherwise, during shutdown or in the future, Recover to a&lt;br/&gt;
Timestamp, there can be a race where the storage engine is accessed while it&lt;br/&gt;
is being destroyed or expects acquiescence from the system.&lt;br/&gt;
Branch:master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3b8719aecf7541ee83738d9241bfcbc1281b6ed2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3b8719aecf7541ee83738d9241bfcbc1281b6ed2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1654559" author="daniel.gottlieb@10gen.com" created="Wed, 23 Aug 2017 02:04:35 +0000"  >&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;commit 3b8719aecf7541ee83738d9241bfcbc1281b6ed2 (HEAD -&amp;gt; master, origin/master, origin/HEAD)&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Author: Daniel Gottlieb &amp;lt;daniel.gottlieb@mongodb.com&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Date:   Tue Aug 22 21:39:06 2017 -0400&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    SERVER-27411: Abandon snapshots before locks are released.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    The storage engine may only be accessed by clients holding the Global lock in&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    at least MODE_IS. Otherwise, during shutdown or in the future, Recover to a&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    Timestamp, there can be a race where the storage engine is accessed while it&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    is being destroyed or expects acquiescence from the system.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</comment>
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            <issuekey id="167524">SERVER-16031</issuekey>
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