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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-15392] geo_validate.js depends on undefined behaviour (and fails on arm64)</title>
                <link>https://jira.mongodb.org/browse/SERVER-15392</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This bit of geo_validate.js fails on arm64:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;assert.commandFailed(db.runCommand({geoNear: coll.getName(),&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                    near: [0,0], spherical: true, num: NaN}));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Digging shows this to be because of this code in geo_near_cmd.cpp:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            if (!eNumWanted.eoo()) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                uassert(17303, &quot;limit must be number&quot;, eNumWanted.isNumber());&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                numWanted = eNumWanted.numberInt();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                uassert(17302, &quot;limit must be &amp;gt;=0&quot;, numWanted &amp;gt;= 0);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;.numberInt() on a double just casts the double value to an int.  Unfortunately, I think casting a NaN to an int is undefined behaviour.  On intel you get INT_MIN but on arm64 (and probably other platforms from what I read) you get 0, a perfectly valid value in this context, and so the test fails.&lt;/p&gt;</description>
                <environment></environment>
        <key id="160109">SERVER-15392</key>
            <summary>geo_validate.js depends on undefined behaviour (and fails on arm64)</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="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="greg_10gen">Greg Studer</assignee>
                                    <reporter username="mwhudson">Michael Hudson-Doyle</reporter>
                        <labels>
                            <label>arm64</label>
                    </labels>
                <created>Thu, 25 Sep 2014 02:17:30 +0000</created>
                <updated>Mon, 11 Jul 2016 17:17:51 +0000</updated>
                            <resolved>Wed, 8 Oct 2014 14:07:45 +0000</resolved>
                                                    <fixVersion>2.7.8</fixVersion>
                                    <component>Geo</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="736442" author="greg_10gen" created="Wed, 8 Oct 2014 14:07:45 +0000"  >&lt;p&gt;The more-appropriate safeNumberLong() is now used to parse geoNear limits.&lt;/p&gt;</comment>
                            <comment id="734765" author="xgen-internal-githook" created="Mon, 6 Oct 2014 16:46:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15392&quot; title=&quot;geo_validate.js depends on undefined behaviour (and fails on arm64)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15392&quot;&gt;&lt;del&gt;SERVER-15392&lt;/del&gt;&lt;/a&gt; safely parse geoNear command limit as long value&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/434f8fc1cfc364d40e2bb7df742412a58c5907ae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/434f8fc1cfc364d40e2bb7df742412a58c5907ae&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="727467" author="mwhudson" created="Thu, 25 Sep 2014 20:41:05 +0000"  >&lt;p&gt;FWIW, I patched numberInt to raise an exception when called on a NaN and ran the tests ... some failed because my VM didn&apos;t have enough disk (sigh) but most passed.  So the test suite, at least, doesn&apos;t depend much on this behaviour.  I suppose isNumber returning false on NaN would be more honest somehow (but then what about infinities?  Or just doubles too large to fit in an integer? Should numberInt return INT_MAX or fail in these cases?)&lt;/p&gt;

&lt;p&gt;The most backwards-compatible-yet-avoiding-undefined-behaviour fix would be &quot;if std::isnan(v) return INT_MIN&quot; but that seems, well, a bit lame.&lt;/p&gt;</comment>
                            <comment id="727356" author="greg_10gen" created="Thu, 25 Sep 2014 18:58:51 +0000"  >&lt;p&gt;Agree that our test suite at least should not rely on this behavior.  In general we may want isNumber() to not return true when the value is NaN, but this will require a bunch of auditing to determine the callers who actually want to process NaN.&lt;/p&gt;</comment>
                            <comment id="726708" author="mwhudson" created="Thu, 25 Sep 2014 02:18:53 +0000"  >&lt;p&gt;I don&apos;t really know what a good fix for this is.  I guess mostly one wants .numberInt() to fail when called on a NaN value &amp;#8211; I guess it could raise an exception but I don&apos;t know enough about how mongod is put together to know if that&apos;s the Right Thing.&lt;/p&gt;</comment>
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