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    <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-39084] Race in wiredTigerPrepareConflictRetry</title>
                <link>https://jira.mongodb.org/browse/SERVER-39084</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In wiredTigerPrepareConflictRetry, we make the attempt to do the read here&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/916a5553/src/mongo/db/storage/wiredtiger/wiredtiger_prepare_conflict.h#L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/916a5553/src/mongo/db/storage/wiredtiger/wiredtiger_prepare_conflict.h#L66&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We then wait by noting the value of the _lastCommitOrAbortCounter and waiting for it to change here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/916a5553/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L336&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/916a5553/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L336&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;But we don&apos;t lock the mutex associated with _lastCommitOrAbortCounter until here&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/916a5553/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L334&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/916a5553/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L334&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;So if _lastCommitOrAbortCounter updates after the prepare conflict but before we get the lock, we could wait indefinitely&lt;/p&gt;</description>
                <environment></environment>
        <key id="674849">SERVER-39084</key>
            <summary>Race in wiredTigerPrepareConflictRetry</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="xiangyu.yao@mongodb.com">Xiangyu Yao</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Jan 2019 17:34:02 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:59 +0000</updated>
                            <resolved>Tue, 19 Feb 2019 15:57:34 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2155576" author="xgen-internal-githook" created="Tue, 19 Feb 2019 15:37:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Xiangyu Yao&apos;, &apos;username&apos;: &apos;xy24&apos;, &apos;email&apos;: &apos;xiangyu.yao@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39084&quot; title=&quot;Race in wiredTigerPrepareConflictRetry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39084&quot;&gt;&lt;del&gt;SERVER-39084&lt;/del&gt;&lt;/a&gt; Fix race condition in PrepareConflictRetry&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cd844d04fd5ca4a5f4224c4423491e37af700ccc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cd844d04fd5ca4a5f4224c4423491e37af700ccc&lt;/a&gt;&lt;/p&gt;</comment>
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