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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-68339] Spurious UBSAN failure when casting large double to float in column store index encoder</title>
                <link>https://jira.mongodb.org/browse/SERVER-68339</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It looks like we need to check whether a double is within float&apos;s numeric limits before casting to a float to see if we lose precision here: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/044d2f734e0dba40b9dfb02cc49c2bff8f575cd5/src/mongo/db/index/column_cell.cpp#L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/044d2f734e0dba40b9dfb02cc49c2bff8f575cd5/src/mongo/db/index/column_cell.cpp#L86&lt;/a&gt;&lt;/p&gt;</description>
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        <key id="2099830">SERVER-68339</key>
            <summary>Spurious UBSAN failure when casting large double to float in column store index encoder</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>pm2646-m5</label>
                    </labels>
                <created>Tue, 26 Jul 2022 21:09:13 +0000</created>
                <updated>Thu, 12 Jan 2023 14:56:54 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5001839" author="charlie.swanson" created="Tue, 22 Nov 2022 20:30:10 +0000"  >&lt;p&gt;Throwing back on the QE backlog for the project as I move onto another project.&lt;/p&gt;</comment>
                            <comment id="4707801" author="redbeard0531" created="Wed, 27 Jul 2022 08:13:23 +0000"  >&lt;p&gt;This isn&apos;t actually UB. It is a bug in UBSAN that was fixed at some point between clang-8 and clang-9: &lt;a href=&quot;https://godbolt.org/z/d8Yrq6e4W.&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://godbolt.org/z/d8Yrq6e4W.&lt;/a&gt; Clang &lt;a href=&quot;https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html#available-checks&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documents&lt;/a&gt; that this should not produce an error: &lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;&lt;tt&gt;-fsanitize=float-cast-overflow&lt;/tt&gt;: Conversion to, from, or between floating-point types which would overflow the destination. Because the range of representable values for all floating-point types supported by Clang is &lt;span class=&quot;error&quot;&gt;&amp;#91;-inf, +inf&amp;#93;&lt;/span&gt;, the only cases detected are conversions from floating point to integer types.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Rather than modifying the code, I&apos;d suggest passing &lt;tt&gt;-fno-sanitize=float-cast-overflow&lt;/tt&gt; when using UBSAN until we upgrade to the v4 toolchain.&lt;/p&gt;</comment>
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