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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>
    </build-info>


<item>
            <title>[SERVER-77527] mongodbtoolchain/v3 stdlib unsafe against self-moves</title>
                <link>https://jira.mongodb.org/browse/SERVER-77527</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Capturing action recommendations from BF investigation.&lt;br/&gt;
A LOT of technical details are included in BF-27032 for this.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=allison.easton%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;allison.easton@mongodb.com&quot;&gt;allison.easton@mongodb.com&lt;/a&gt; summarized well here:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;std::shuffle has a bug in which it will sometimes try to swap an object with itself. This results in a self move of the object. Some stl types (including vector) had bugs relating to self move operations and debug assertions that they cannot be move assigned to themselves. These problems are fixed in the v4 toolchain due to fixes in libstdc+, but these fixes are not present in the v3 toolchain. We need to upgrade libstdc+ in the v3 toolchain so that these containers have the fixes for self moves.&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=billy.donahue%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;billy.donahue@mongodb.com&quot;&gt;billy.donahue@mongodb.com&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.diener%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matt.diener@mongodb.com&quot;&gt;matt.diener@mongodb.com&lt;/a&gt; confirmed this assessment after further investigation into whether this could be confined to tests. Unfortunately it is not.&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;The toolchain v3 standard library would need to be patched or abandoned to get us past this.&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;It&apos;s unknown at this time what the impact of leaving v3 toolchain unpatched would be. We&apos;d have to study the faulty move operations and write tests against them. My guess is that this would be at least as much work as patching the toolchain, likely more. In the meantime we&apos;re looking at undefined behavior or worse and we should not let that continue.&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;It&apos;s also possible the answer here is to have C++ engineers study the self-move bugs in the standard library implementations more closely.&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="2351853">SERVER-77527</key>
            <summary>mongodbtoolchain/v3 stdlib unsafe against self-moves</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.moody@mongodb.com">Daniel Moody</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 May 2023 18:06:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:50 +0000</updated>
                            <resolved>Thu, 29 Jun 2023 19:18:03 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>6.3.2</fixVersion>
                    <fixVersion>5.0.19</fixVersion>
                    <fixVersion>4.4.23</fixVersion>
                    <fixVersion>7.0.0-rc6</fixVersion>
                    <fixVersion>6.0.8</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5530429" author="JIRAUSER1253549" created="Wed, 28 Jun 2023 11:55:59 +0000"  >&lt;p&gt;I verified this was fixed with the test code:&lt;/p&gt;

&lt;p&gt;&lt;b&gt;test.cpp&lt;/b&gt;&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;#include &amp;lt;vector&amp;gt;&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;#include &amp;lt;random&amp;gt;&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;#include &amp;lt;algorithm&amp;gt;&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;&amp;nbsp;&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;struct Type {&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;        std::vector&amp;lt;&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;int&lt;/span&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;&amp;gt; ints;&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;};&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;&amp;nbsp;&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;int&lt;/span&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; main() {&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;        std::vector&amp;lt;Type&amp;gt; intVectors = {{{&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&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;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;        std::shuffle(intVectors.begin(), intVectors.end(), std::mt19937());&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;Then compiling with the old v3 toolchain:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;/opt/mongodbtoolchain/revisions/11316f1e7b36f08dcdd2ad0640af18f9287876f4/v3/bin/g++ ./test.cpp -D_GLIBCXX_DEBUG&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;gives:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;&#10095; ./a.out&lt;br/&gt;
/opt/mongodbtoolchain/revisions/11316f1e7b36f08dcdd2ad0640af18f9287876f4/stow/gcc-v3.cmc/include/c++/8.5.0/debug/safe_container.h:83:&lt;br/&gt;
Error: attempt to self move assign.&lt;/p&gt;

&lt;p&gt;Objects involved in the operation:&lt;br/&gt;
    sequence &quot;this&quot; @ 0x0x1fe9ee8 &lt;/p&gt;
&lt;div class=&quot;error&quot;&gt;&lt;span class=&quot;error&quot;&gt;Unknown macro: {
      type = __gnu_debug}&lt;/span&gt; &lt;/div&gt;
&lt;p&gt;Aborted (core dumped)&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;now compiling with the latest v3:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;/opt/mongodbtoolchain/revisions/69f4f0673ffcb290ce2307560a4883ecf2ad138c/v3/bin/g++ ./test.cpp -D_GLIBCXX_DEBUG&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;gives no error:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;&#10095; ./a.out&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="5528719" author="JIRAUSER1253549" created="Tue, 27 Jun 2023 17:52:35 +0000"  >&lt;p&gt; toolchain is deployed in almost all the platforms, I will verify if I can detect the UB with some of &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=billy.donahue%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;billy.donahue@mongodb.com&quot;&gt;billy.donahue@mongodb.com&lt;/a&gt;&apos;s examples&lt;/p&gt;</comment>
                            <comment id="5503351" author="JIRAUSER1253549" created="Thu, 15 Jun 2023 21:47:55 +0000"  >&lt;p&gt;after the toolchain is deployed in BUILD-17505 the stdlibc++ patch can be verified to be deployed in v3 builders and we can close this.&lt;/p&gt;</comment>
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