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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35511] OplogApplier batching logic erroneously reads oplog document size after std::moving.</title>
                <link>https://jira.mongodb.org/browse/SERVER-35511</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://github.com/mongodb/mongo/blob/424dc423aff51129ef64ff109c7288330570fa28/src/mongo/db/repl/oplog_applier.cpp#L185-L186&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;moving the oplog entry object, it is accessed to determine the object size&lt;/a&gt;. After the move, my machine, says the size of the entry is 5 bytes. This messes up the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/424dc423aff51129ef64ff109c7288330570fa28/src/mongo/db/repl/oplog_applier.cpp#L174-L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;byte size limit&lt;/a&gt; in the batching logic.&lt;/p&gt;</description>
                <environment></environment>
        <key id="556279">SERVER-35511</key>
            <summary>OplogApplier batching logic erroneously reads oplog document size after std::moving.</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Fri, 8 Jun 2018 17:42:32 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:55 +0000</updated>
                            <resolved>Fri, 8 Jun 2018 19:37:31 +0000</resolved>
                                                    <fixVersion>4.0.0-rc5</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1917706" author="spencer" created="Mon, 11 Jun 2018 22:05:54 +0000"  >&lt;p&gt;That makes sense, thanks for clarifying!&lt;/p&gt;</comment>
                            <comment id="1917653" author="acm" created="Mon, 11 Jun 2018 21:35:48 +0000"  >&lt;p&gt;The state of a moved from object is &quot;valid, but unspecified&quot;. In the case of &lt;tt&gt;BSONObj&lt;/tt&gt; the moved from state is equivalent to a default constructed BSONObj, which is equivalent to an the &quot;5 byte empty document&quot; BSON representation. So in fact a moved from &lt;tt&gt;BSONObj&lt;/tt&gt; is in a fully valid state. Since the state is unspecified, static analysis tools can&apos;t really decide that you are doing the wrong thing to access a moved from object, unfortunately. That said, I think the fact that our default constructed &lt;tt&gt;BSONObj&lt;/tt&gt; has a representation his highly questionable, but given that those were the semantics, it made some degree of sense that the moved from state was made equivalent to the default constructed state. Had we the decision to make over again from the beginning, I would have preferred that a default constructed &lt;tt&gt;BSONObj&lt;/tt&gt; was nullish like &lt;tt&gt;unique_ptr&lt;/tt&gt;, and that we provided a designated static &lt;tt&gt;BSONObj::kEmptyDocument&lt;/tt&gt; to represent the empty document. Then we could have made a moved from &lt;tt&gt;BSONObj&lt;/tt&gt; still have the semantics of returning to a default constructed state, but it would have been an immediate runtime error to use it.&lt;/p&gt;</comment>
                            <comment id="1917585" author="spencer" created="Mon, 11 Jun 2018 21:17:23 +0000"  >&lt;p&gt;Is there a reason this wasn&apos;t caught by static analysis (coverity)?  &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1917220" author="benety.goh" created="Mon, 11 Jun 2018 17:22:30 +0000"  >&lt;p&gt;3.4 and 3.6 are not affected by issue raised in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35511&quot; title=&quot;OplogApplier batching logic erroneously reads oplog document size after std::moving.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35511&quot;&gt;&lt;del&gt;SERVER-35511&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1917216" author="benety.goh" created="Mon, 11 Jun 2018 17:21:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;, you&apos;re right. Updating backport fields.&lt;/p&gt;</comment>
                            <comment id="1915611" author="xgen-internal-githook" created="Fri, 8 Jun 2018 19:36:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35511&quot; title=&quot;OplogApplier batching logic erroneously reads oplog document size after std::moving.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35511&quot;&gt;&lt;del&gt;SERVER-35511&lt;/del&gt;&lt;/a&gt;: Access oplog entry before destroying its state with std::move.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 359232eed65c26d28dc36edb5cb189ce37b988be)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dbb8a02faa82c2e31307582030f20899c200af29&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dbb8a02faa82c2e31307582030f20899c200af29&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1915607" author="xgen-internal-githook" created="Fri, 8 Jun 2018 19:34:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35511&quot; title=&quot;OplogApplier batching logic erroneously reads oplog document size after std::moving.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35511&quot;&gt;&lt;del&gt;SERVER-35511&lt;/del&gt;&lt;/a&gt;: Access oplog entry before destroying its state with std::move.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/359232eed65c26d28dc36edb5cb189ce37b988be&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/359232eed65c26d28dc36edb5cb189ce37b988be&lt;/a&gt;&lt;/p&gt;</comment>
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