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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-70338] Query yield accesses the storage engine without locks during shutdown and rollback</title>
                <link>https://jira.mongodb.org/browse/SERVER-70338</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/02fbdd561aeb614ce27dc014769e6e3bbc6ce9ee/src/mongo/db/query/plan_yield_policy.cpp#L169-L197&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;yielding code&lt;/a&gt; in PlanYieldPolicy does the following:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Releases its locks&lt;/li&gt;
	&lt;li&gt;Rolls-back the storage transaction via &lt;a href=&quot;https://github.com/mongodb/mongo/blob/02fbdd561aeb614ce27dc014769e6e3bbc6ce9ee/src/mongo/db/query/plan_yield_policy.cpp#L187&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;abandonSnapshot()&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;Re-acquires its locks&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The global lock synchronizes access to the storage engine for shutdown and rollback. This order of operations can result in the operation unsafely accessing the storage engine during these periods.&lt;/p&gt;

&lt;p&gt;This has existed since at least 3.6.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2154277">SERVER-70338</key>
            <summary>Query yield accesses the storage engine without locks during shutdown and rollback</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Oct 2022 13:59:06 +0000</created>
                <updated>Wed, 13 Dec 2023 20:47:41 +0000</updated>
                            <resolved>Tue, 25 Apr 2023 15:48:57 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.5</fixVersion>
                    <fixVersion>6.0.13</fixVersion>
                                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="5949171" author="xgen-internal-githook" created="Wed, 13 Dec 2023 20:27:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70338&quot; title=&quot;Query yield accesses the storage engine without locks during shutdown and rollback&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70338&quot;&gt;&lt;del&gt;SERVER-70338&lt;/del&gt;&lt;/a&gt; Abandon snapshot while holding locks during query yield&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Alters the Locker contract to require callers to check if they can yield locks before yielding&lt;/li&gt;
	&lt;li&gt;Reverses the ordering of yielding such that the snapshot is released before releasing locks&lt;/li&gt;
	&lt;li&gt;Refactors the PlanYieldPolicy to allow it to override the requested YieldPolicy if necessary&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(cherry picked from commit 55877fcfb5e8ac0b23f65862cd1d2f9b439c07f6)&lt;br/&gt;
(cherry picked from commit ee30bfbb242d32fb79cb1d309a099d6cf6099329)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 5ef84cf4a6616131694bc4c269d83c05fd570648&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f020d8e8e10464b95720defd8b56b8a4d53e0af8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f020d8e8e10464b95720defd8b56b8a4d53e0af8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5942421" author="xgen-internal-githook" created="Mon, 11 Dec 2023 22:54:28 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70338&quot; title=&quot;Query yield accesses the storage engine without locks during shutdown and rollback&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70338&quot;&gt;&lt;del&gt;SERVER-70338&lt;/del&gt;&lt;/a&gt; Abandon snapshot while holding locks during query yield&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Alters the Locker contract to require callers to check if they can yield locks before yielding&lt;/li&gt;
	&lt;li&gt;Reverses the ordering of yielding such that the snapshot is released before releasing locks&lt;/li&gt;
	&lt;li&gt;Refactors the PlanYieldPolicy to allow it to override the requested YieldPolicy if necessary&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;(cherry picked from commit 55877fcfb5e8ac0b23f65862cd1d2f9b439c07f6)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 1854bf2ace299e22995bf8d7e64195107f703029&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7c1cd6a06c42b15fc35d85f512a7e166bf9bffcf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7c1cd6a06c42b15fc35d85f512a7e166bf9bffcf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5374083" author="xgen-internal-githook" created="Tue, 25 Apr 2023 15:42:43 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70338&quot; title=&quot;Query yield accesses the storage engine without locks during shutdown and rollback&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70338&quot;&gt;&lt;del&gt;SERVER-70338&lt;/del&gt;&lt;/a&gt; Abandon snapshot while holding locks during query yield&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Alters the Locker contract to require callers to check if they can yield locks before yielding&lt;/li&gt;
	&lt;li&gt;Reverses the ordering of yielding such that the snapshot is released before releasing locks&lt;/li&gt;
	&lt;li&gt;Refactors the PlanYieldPolicy to allow it to override the requested YieldPolicy if necessary&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/55877fcfb5e8ac0b23f65862cd1d2f9b439c07f6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/55877fcfb5e8ac0b23f65862cd1d2f9b439c07f6&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="4967055" author="JIRAUSER1264163" created="Wed, 9 Nov 2022 15:07:46 +0000"  >&lt;p&gt;The rollback path is also safe. Rollback returns an EBUSY error if there are any active cursors or transactions. That is, it will only succeed if there are no active users in WT. This error gets retried in 6.0+ as of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63989&quot; title=&quot;Retry rollback_to_stable until all concurrent operations finish&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63989&quot;&gt;&lt;del&gt;SERVER-63989&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4939193" author="JIRAUSER1264163" created="Mon, 31 Oct 2022 12:28:51 +0000"  >&lt;p&gt;Right now the shutdown path is safe. Sessions will all get killed and drained before shutting down the storage engine.&lt;/p&gt;

&lt;p&gt;This happens &lt;a href=&quot;https://github.com/mongodb/mongo/blob/23c0f6ebdab069e2fa97e42194bdbade77a62810/src/mongo/db/mongod_main.cpp#L1495&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here.&lt;/a&gt;&lt;/p&gt;</comment>
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