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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-19805] MMap memory mapped file address allocation code cannot handle addresses non-aligned to memory mapped granularity size</title>
                <link>https://jira.mongodb.org/browse/SERVER-19805</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of the fix to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10516&quot; title=&quot;mongod crashes when re-mapping above user address space of 8TB on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10516&quot;&gt;&lt;del&gt;SERVER-10516&lt;/del&gt;&lt;/a&gt;, the code tries to find the next available free slot of virtual memory to allocate a memory mapped file. If the base address of the memory region or the allocation size returned by Virtual Query are not aligned to the memory mapped file granularity boundary, MongoDB will then try to map a file to an address not aligned with the correct granularity.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0205239ecb579e20b05cee3a0df394eb11ba14ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0205239ecb579e20b05cee3a0df394eb11ba14ce&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="224516">SERVER-19805</key>
            <summary>MMap memory mapped file address allocation code cannot handle addresses non-aligned to memory mapped granularity size</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Aug 2015 20:04:44 +0000</created>
                <updated>Mon, 14 Dec 2015 22:48:19 +0000</updated>
                            <resolved>Mon, 10 Aug 2015 16:34:33 +0000</resolved>
                                    <version>3.0.5</version>
                    <version>3.1.6</version>
                                    <fixVersion>3.0.6</fixVersion>
                    <fixVersion>3.1.7</fixVersion>
                                    <component>MMAPv1</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1000851" author="xgen-internal-githook" created="Mon, 10 Aug 2015 16:33:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19805&quot; title=&quot;MMap memory mapped file address allocation code cannot handle addresses non-aligned to memory mapped granularity size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19805&quot;&gt;&lt;del&gt;SERVER-19805&lt;/del&gt;&lt;/a&gt;: MMap memory mapped file address allocation code cannot handle&lt;br/&gt;
addresses non-aligned to OS allocation granularity&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/05cd4c789e8b1da3df6cf0fcc8f98f85e6ecc84d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/05cd4c789e8b1da3df6cf0fcc8f98f85e6ecc84d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1000844" author="xgen-internal-githook" created="Mon, 10 Aug 2015 16:29:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19805&quot; title=&quot;MMap memory mapped file address allocation code cannot handle addresses non-aligned to memory mapped granularity size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19805&quot;&gt;&lt;del&gt;SERVER-19805&lt;/del&gt;&lt;/a&gt;: MMap memory mapped file address allocation code cannot handle&lt;br/&gt;
addresses non-aligned to OS allocation granularity&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/99a512ee7029d5ce20a8d3135a0f27364452255d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/99a512ee7029d5ce20a8d3135a0f27364452255d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="998885" author="mark.benvenuto" created="Thu, 6 Aug 2015 22:32:36 +0000"  >&lt;p&gt;When we scan for free virtual memory, not all allocations are allocated to the right granularity. The allocations are aligned to OS page granularity (4kb), but need to be aligned to system allocation granularity (64kb).&lt;/p&gt;</comment>
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            <issuekey id="155238">SERVER-15070</issuekey>
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