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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-535] possible concurrency issues in id-based lastError code</title>
                <link>https://jira.mongodb.org/browse/SERVER-535</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I don&apos;t know much about how message-id based lastErrors are to be used, but it seems like there could be some concurrency issues:&lt;/p&gt;

&lt;p&gt;For example, lastError.startRequest() is called in connThread() without any mutex, and it in turn calls lastError.get() which reads and modifies the lastError._ids map without a mutex.  Since there&apos;s only one global lastError object shared by all threads this could be a problem.  In addition, only the top two bytes of the message id are used to map a LastError object.  Conceivably a single LastError object could be used by two threads, though depending on usage perhaps this is prevented in practice?&lt;/p&gt;</description>
                <environment></environment>
        <key id="11113">SERVER-535</key>
            <summary>possible concurrency issues in id-based lastError code</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Jan 2010 20:09:10 +0000</created>
                <updated>Tue, 12 Jul 2016 00:30:05 +0000</updated>
                            <resolved>Fri, 15 Jan 2010 16:00:41 +0000</resolved>
                                                    <fixVersion>1.3.1</fixVersion>
                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="11798" author="eliot" created="Fri, 15 Jan 2010 16:00:41 +0000"  >&lt;p&gt;forgot 2 locks&lt;/p&gt;

&lt;p&gt;the multiple thread same is managed above this in the sharding layer.&lt;br/&gt;
it is supposed to guarantee only 1 thread has a given id at any time&lt;/p&gt;</comment>
                            <comment id="11797" author="auto" created="Fri, 15 Jan 2010 16:00:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: fix id based last error concurrency &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-535&quot; title=&quot;possible concurrency issues in id-based lastError code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-535&quot;&gt;&lt;del&gt;SERVER-535&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/02e33dafc066677d0f6c33f78937835ddb0cf1ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/02e33dafc066677d0f6c33f78937835ddb0cf1ce&lt;/a&gt;&lt;/p&gt;</comment>
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