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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-37427] KillSessions should ignore CursorNotFound while killing all the cursors</title>
                <link>https://jira.mongodb.org/browse/SERVER-37427</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a TOCTOU bug in the code of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a9e43e1a8f435ecde4de7f94c6f54c35335c1e4b/src/mongo/db/kill_sessions_common.h#L98-L105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;KillSessions&lt;/tt&gt; command&lt;/a&gt;: The cursorMap mutex is not held while each cursor is being killed. It is possible that a &lt;tt&gt;KillCursors&lt;/tt&gt; command jumps in and kills a cursor which will be but has not been killed by this&#160;&lt;tt&gt;KillSessions&lt;/tt&gt;. &lt;tt&gt;KillSessions&lt;/tt&gt; will then get a &lt;tt&gt;CursorNotFound&lt;/tt&gt; exception.&lt;/p&gt;</description>
                <environment></environment>
        <key id="612907">SERVER-37427</key>
            <summary>KillSessions should ignore CursorNotFound while killing all the cursors</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="xiangyu.yao@mongodb.com">Xiangyu Yao</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Oct 2018 19:30:30 +0000</created>
                <updated>Tue, 6 Dec 2022 03:16:47 +0000</updated>
                            <resolved>Mon, 15 Apr 2019 14:16:59 +0000</resolved>
                                                                    <component>Querying</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2213335" author="xiangyu.yao" created="Mon, 15 Apr 2019 14:51:31 +0000"  >&lt;p&gt;Done.&lt;/p&gt;</comment>
                            <comment id="2213315" author="dianna.hohensee" created="Mon, 15 Apr 2019 14:46:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xiangyu.yao&quot; class=&quot;user-hover&quot; rel=&quot;xiangyu.yao&quot;&gt;xiangyu.yao&lt;/a&gt;, can you update the ticket linking? Right now we have a BF that is &quot;Waiting for bug fix&quot; on this ticket that either needs to be closed or reopened or found a new ticket on which to depend for fix; and the open BF should probably be unlinked?&lt;/p&gt;</comment>
                            <comment id="2202480" author="milkie" created="Thu, 4 Apr 2019 19:45:56 +0000"  >&lt;p&gt;We&apos;ll look into solutions for this.&lt;/p&gt;</comment>
                            <comment id="2024373" author="xiangyu.yao" created="Thu, 4 Oct 2018 21:22:48 +0000"  >&lt;p&gt;Ignoring CursorNotFound would indeed solved the linked BF, but it would leave another problem. If KillSessions does not block the creation/deletion of cursors while killing all the cursors, it could accidentally kill another cursor with the same cursor id as one of the killed cursors: &lt;br/&gt;
1. KillSessions gets a list of cursors to be killed including cursor A.&lt;br/&gt;
2. A killCursor command kills cursor A. &lt;br/&gt;
3. Then another session tries to create a cursor with the same cursor id as cursor A. &lt;br/&gt;
4. KillSessions now kills the newly created cursor.&lt;/p&gt;</comment>
                            <comment id="2021280" author="schwerin" created="Tue, 2 Oct 2018 20:48:15 +0000"  >&lt;p&gt;If we hold the mutex the whole time, then killing the cursors on a single session blocks creation of new cursors on other sessions at the same time. Could this be a problem? Would ignoring CursorNotFound in the existing implementation be safe?&lt;/p&gt;</comment>
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            <issuekey id="669474">SERVER-38931</issuekey>
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            <issuekey id="600014">SERVER-37009</issuekey>
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