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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-5110] ReplicaSetMonitor::check not thread safe wrt _master </title>
                <link>https://jira.mongodb.org/browse/SERVER-5110</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It&apos;s possible for a thread to notifyFailure(), resetting the _master variable to -1, between the time when the _master variable is checked here and when it is actually used to access the nodes array.  We need to acquire _lock to do this safely.  &lt;/p&gt;

&lt;p&gt;There may be other issues here - the _check code modifies _master without locks in other places?&lt;/p&gt;</description>
                <environment></environment>
        <key id="31652">SERVER-5110</key>
            <summary>ReplicaSetMonitor::check not thread safe wrt _master </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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 Feb 2012 15:14:18 +0000</created>
                <updated>Mon, 11 Jul 2016 18:32:59 +0000</updated>
                            <resolved>Tue, 3 Apr 2012 21:19:49 +0000</resolved>
                                                    <fixVersion>2.0.5</fixVersion>
                    <fixVersion>2.1.1</fixVersion>
                                    <component>Internal Client</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="110861" author="auto" created="Tue, 17 Apr 2012 20:32:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;renctan&apos;, u&apos;email&apos;: u&apos;renctan@gmail.com&apos;, u&apos;name&apos;: u&apos;renctan&apos;}
&lt;p&gt;Message: undo &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5110&quot; title=&quot;ReplicaSetMonitor::check not thread safe wrt _master &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5110&quot;&gt;&lt;del&gt;SERVER-5110&lt;/del&gt;&lt;/a&gt; chnages on log display logic&lt;br/&gt;
Branch: v2.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7460b30455b080fcb957248784871aa66538cb1c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7460b30455b080fcb957248784871aa66538cb1c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="110860" author="auto" created="Tue, 17 Apr 2012 20:32:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5110&quot; title=&quot;ReplicaSetMonitor::check not thread safe wrt _master &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5110&quot;&gt;&lt;del&gt;SERVER-5110&lt;/del&gt;&lt;/a&gt; ReplicaSetMonitor::check not thread safe wrt _master&lt;/p&gt;

&lt;p&gt;Made chages to make sure that proper mutexes are held when modifying _master and _nodes.&lt;br/&gt;
Also made sure that index variables pointing to _nodes element still refers to what&lt;br/&gt;
it used to be after we re-acquire the mutex.&lt;br/&gt;
Branch: v2.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aee93cd91ad5e25f6662ccfb26d89d1a1cd06e2b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aee93cd91ad5e25f6662ccfb26d89d1a1cd06e2b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="106331" author="auto" created="Wed, 4 Apr 2012 01:02:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;renctan&apos;, u&apos;email&apos;: u&apos;renctan@gmail.com&apos;}
&lt;p&gt;Message: undo &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5110&quot; title=&quot;ReplicaSetMonitor::check not thread safe wrt _master &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5110&quot;&gt;&lt;del&gt;SERVER-5110&lt;/del&gt;&lt;/a&gt; chnages on log display logic&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6980e9f942291028b6327a1565be26ebb072086f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6980e9f942291028b6327a1565be26ebb072086f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="106247" author="auto" created="Tue, 3 Apr 2012 21:19:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5110&quot; title=&quot;ReplicaSetMonitor::check not thread safe wrt _master &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5110&quot;&gt;&lt;del&gt;SERVER-5110&lt;/del&gt;&lt;/a&gt; ReplicaSetMonitor::check not thread safe wrt _master&lt;/p&gt;

&lt;p&gt;Made chages to make sure that proper mutexes are held when modifying _master and _nodes.&lt;br/&gt;
Also made sure that index variables pointing to _nodes element still refers to what&lt;br/&gt;
it used to be after we re-acquire the mutex.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ec1dfbd4d7baa79d1f74d6325383461d371142fe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ec1dfbd4d7baa79d1f74d6325383461d371142fe&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="32921">SERVER-5302</issuekey>
        </issuelink>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="38543">SERVER-5833</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="42804">SERVER-6245</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="31976">SERVER-5166</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="58294">SERVER-7841</issuekey>
        </issuelink>
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                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="33562">SERVER-5362</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="34608">SERVER-5392</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="35421">SERVER-5496</issuekey>
        </issuelink>
                            </inwardlinks>
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