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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-43641] platform/random.h causing bugs, upgrade overdue</title>
                <link>https://jira.mongodb.org/browse/SERVER-43641</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Working hypothesis for BF-13608 is that it may have been caused by a badly calculated PseudoRandom sampling operation.&lt;/p&gt;

&lt;p&gt;Without changing the underlying fundamentals or the API, we can make all these PseudoRandom and SecureRandom operations do what they claim to do, relying on vetted stdlib &amp;lt;random&amp;gt; facilities.&lt;/p&gt;</description>
                <environment></environment>
        <key id="940083">SERVER-43641</key>
            <summary>platform/random.h causing bugs, upgrade overdue</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="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 Sep 2019 18:06:26 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:47 +0000</updated>
                            <resolved>Wed, 9 Oct 2019 17:13:56 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2475353" author="xgen-internal-githook" created="Thu, 10 Oct 2019 11:04:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;benety&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;name&apos;: &apos;Benety Goh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43641&quot; title=&quot;platform/random.h causing bugs, upgrade overdue&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43641&quot;&gt;&lt;del&gt;SERVER-43641&lt;/del&gt;&lt;/a&gt; fix test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/424c1eb4c8cc50219d2a741741275dfdc3ecf3fa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/424c1eb4c8cc50219d2a741741275dfdc3ecf3fa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2474248" author="billy.donahue" created="Wed, 9 Oct 2019 17:13:56 +0000"  >&lt;p&gt;we&apos;ll try this again!&lt;/p&gt;</comment>
                            <comment id="2474236" author="xgen-internal-githook" created="Wed, 9 Oct 2019 17:09:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;BillyDonahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;name&apos;: &apos;Billy Donahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43641&quot; title=&quot;platform/random.h causing bugs, upgrade overdue&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43641&quot;&gt;&lt;del&gt;SERVER-43641&lt;/del&gt;&lt;/a&gt; upgrade random.h&lt;/p&gt;

&lt;p&gt;This reverts commit a40b196bd3cecd0b66a6323f57e6f08efe0af392.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1f433d2c47f623ceb5d1d1aee7605fefb71b846&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1f433d2c47f623ceb5d1d1aee7605fefb71b846&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2447412" author="xgen-internal-githook" created="Wed, 2 Oct 2019 14:48:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;James Wahlin&apos;, &apos;username&apos;: &apos;jameswahlin&apos;, &apos;email&apos;: &apos;james.wahlin@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43641&quot; title=&quot;platform/random.h causing bugs, upgrade overdue&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43641&quot;&gt;&lt;del&gt;SERVER-43641&lt;/del&gt;&lt;/a&gt; upgrade random.h&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 96da177c6ae7b7ed0f29983ad033d8a59524b0b2.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a40b196bd3cecd0b66a6323f57e6f08efe0af392&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a40b196bd3cecd0b66a6323f57e6f08efe0af392&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2447102" author="james.wahlin@10gen.com" created="Wed, 2 Oct 2019 13:35:45 +0000"  >&lt;p&gt;Reopening as this change will be reverted. db_free_mon_test and db_repl_coordinator_test are failing consistently on the required builders post commit. &lt;/p&gt;</comment>
                            <comment id="2446036" author="xgen-internal-githook" created="Wed, 2 Oct 2019 04:42:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43641&quot; title=&quot;platform/random.h causing bugs, upgrade overdue&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43641&quot;&gt;&lt;del&gt;SERVER-43641&lt;/del&gt;&lt;/a&gt; upgrade random.h&lt;/p&gt;

&lt;p&gt;Respecify PseudoRandom and SecureRandom as template instances of&lt;br/&gt;
a `mongo::RandomBase&amp;lt;Urbg&amp;gt;` (Urbg is a UniformRandomBitGenerator).&lt;br/&gt;
They will only vary in which algorithm they use for their source&lt;br/&gt;
bits, and should otherwise support the same exact operations (e.g.&lt;br/&gt;
`nextCanonicalDouble`).&lt;/p&gt;

&lt;p&gt;Fix range and stats errors in the implementations of those&lt;br/&gt;
RandomBase methods, and specify them in terms of the vetted&lt;br/&gt;
`&amp;lt;random&amp;gt;` facilities.&lt;/p&gt;

&lt;p&gt;Test uniformity of nextInt32(max), which uses an inappropriate&lt;br/&gt;
( x % max) operation.  Verify that refactor fixes this issue.&lt;/p&gt;

&lt;p&gt;Just keep a shared urandom file descriptor open.&lt;/p&gt;

&lt;p&gt;SecureRandom add fill, remove create, fix callers&lt;/p&gt;

&lt;p&gt;Obsoletes &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43643&quot; title=&quot;each SecureRandom reads 8kiB out of /dev/urandom&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43643&quot;&gt;&lt;del&gt;SERVER-43643&lt;/del&gt;&lt;/a&gt; Re: SecureRandom 8kiB buffering&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/96da177c6ae7b7ed0f29983ad033d8a59524b0b2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/96da177c6ae7b7ed0f29983ad033d8a59524b0b2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2433344" author="billy.donahue" created="Wed, 25 Sep 2019 18:44:26 +0000"  >&lt;p&gt;Demo of how PseudoRandom::nextInt32() is non-uniformly distributed.&lt;br/&gt;
&lt;a href=&quot;https://gist.github.com/BillyDonahue/53fa229d311cc6ac1f5ab21bd588e11f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gist.github.com/BillyDonahue/53fa229d311cc6ac1f5ab21bd588e11f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2433301" author="billy.donahue" created="Wed, 25 Sep 2019 18:17:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://mongodbcr.appspot.com/511160003&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/511160003&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10420">
                    <name>Backports</name>
                                            <outwardlinks description="backported by">
                                        <issuelink>
            <issuekey id="1521796">SERVER-51803</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="309559">SERVER-25659</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                                                <inwardlinks description="has to be done after">
                                        <issuelink>
            <issuekey id="956579">SERVER-43767</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="957157">SERVER-43778</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                                        </outwardlinks>
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