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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-2009] potentially incorrectly handled test in client cursor may result in improper skipping</title>
                <link>https://jira.mongodb.org/browse/SERVER-2009</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I haven&apos;t confirmed this behavior with a test, but it looks like the following sequence of events may be possible:&lt;/p&gt;

&lt;p&gt;1) a client cursor points to a btree entry with key &apos;a&apos; with disk loc X and is yielding or awaiting getMore&lt;br/&gt;
2) the object at loc X is modified in place so as to not contain key &apos;a&apos;&lt;br/&gt;
3) the object at loc X is removed&lt;/p&gt;

&lt;p&gt;As part of 3), clientcursor&apos;s aboutToDelete() will expect to find a cursor pointing at btree node &amp;lt;&apos;a&apos;,X&amp;gt; and call checkLocation() on that cursor.  Because the btree key has been removed, checkLocation() will advance to the next key past the expected one.  If this key has a refLoc other than X (which is quite likely), aboutToDelete() will log a warning and advance the cursor again anyway, even though it should not advance because the btree key is pointing at a different record location.&lt;/p&gt;</description>
                <environment></environment>
        <key id="13512">SERVER-2009</key>
            <summary>potentially incorrectly handled test in client cursor may result in improper skipping</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="aaron">Aaron Staple</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Tue, 26 Oct 2010 19:49:04 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:21 +0000</updated>
                            <resolved>Fri, 3 Jun 2011 14:45:27 +0000</resolved>
                                                    <fixVersion>1.9.1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="35766" author="auto" created="Thu, 2 Jun 2011 17:36:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;astaple&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2009&quot; title=&quot;potentially incorrectly handled test in client cursor may result in improper skipping&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2009&quot;&gt;&lt;del&gt;SERVER-2009&lt;/del&gt;&lt;/a&gt; don&apos;t skip location on yield recovery when the location has already been updated&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f2beea161e769f7bc70a5994c16337e605f4e748&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f2beea161e769f7bc70a5994c16337e605f4e748&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="26848" author="auto" created="Fri, 25 Mar 2011 18:31:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;astaple&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2009&quot; title=&quot;potentially incorrectly handled test in client cursor may result in improper skipping&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2009&quot;&gt;&lt;del&gt;SERVER-2009&lt;/del&gt;&lt;/a&gt; add test for spurious wassert on delete&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/819f4001dff0678aa3550b3eec6ac699fddf6b66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/819f4001dff0678aa3550b3eec6ac699fddf6b66&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="26847" author="auto" created="Fri, 25 Mar 2011 18:31:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;astaple&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2009&quot; title=&quot;potentially incorrectly handled test in client cursor may result in improper skipping&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2009&quot;&gt;&lt;del&gt;SERVER-2009&lt;/del&gt;&lt;/a&gt; test where a document is incorrectly skipped&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aac5e1bd9b6d6cd9ce6e93fef1a2db01873eec4b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aac5e1bd9b6d6cd9ce6e93fef1a2db01873eec4b&lt;/a&gt;&lt;/p&gt;</comment>
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