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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-27555] ReplicationCoordinatorImpl::_memberState is read without proper locking</title>
                <link>https://jira.mongodb.org/browse/SERVER-27555</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ReplicationCoordinatorImpl::canAcceptWritesFor and checkCanServeReadsFor both read _memberState and make decisions on it, but neither lock _mutex or _topoMutex.&lt;/p&gt;</description>
                <environment></environment>
        <key id="341793">SERVER-27555</key>
            <summary>ReplicationCoordinatorImpl::_memberState is read without proper locking</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="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Dec 2016 20:55:18 +0000</created>
                <updated>Wed, 5 Apr 2017 11:34:41 +0000</updated>
                            <resolved>Thu, 9 Mar 2017 19:48:42 +0000</resolved>
                                                    <fixVersion>3.5.5</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1520313" author="spencer" created="Thu, 9 Mar 2017 19:48:30 +0000"  >&lt;p&gt;Even though the fix adds a potential mutex acquisition into canAcceptWritesFor and checkCanServerReadsFor, I don&apos;t believe it comes with a real performance cost.  The mutex acquisition can only possibly happen if those methods are called on the oplog namespace.  Normal writes on the primary and secondary do not ever call into canAcceptWritesFor() for the oplog write, so the only cost from acquiring the mutex on oplog writes in canAcceptWritesFor() is for user-initiated writes to the oplog.  Reads done for replication will call checkCanServerReadsFor against the oplog namespace, but usually against a node that is in PRIMARY or SECONDARY states, and the fix does not lock the mutex if the node is primary or secondary.  The only time I think this change results in a mutex acquisition that wasn&apos;t there previously is for oplog reads from a node that is in RECOVERING, which shouldn&apos;t pose a practical performance problem.&lt;/p&gt;</comment>
                            <comment id="1520134" author="xgen-internal-githook" created="Thu, 9 Mar 2017 18:05:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27555&quot; title=&quot;ReplicationCoordinatorImpl::_memberState is read without proper locking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27555&quot;&gt;&lt;del&gt;SERVER-27555&lt;/del&gt;&lt;/a&gt; Use proper locking when reading _memberState&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4e9d665b8c368f9de9d8bdd3e098197bffc3abd8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4e9d665b8c368f9de9d8bdd3e098197bffc3abd8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1467291" author="milkie" created="Sat, 31 Dec 2016 01:45:57 +0000"  >&lt;p&gt;Unfortunately, I don&apos;t believe that we can fix this by simply locking mutexes, as the perf impact will be too great.   However, for canAcceptWritesFor(), we might be able to check ns.isOplog() first, and then lock the mutex and check _memberState if true.&lt;br/&gt;
Similarly for checkCanServeReadsFor().&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="208184">SERVER-18807</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="351022">SERVER-27892</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="351614">SERVER-27911</issuekey>
        </issuelink>
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