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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-13410] split does not install metadata under the dblock</title>
                <link>https://jira.mongodb.org/browse/SERVER-13410</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have observed 3 separate instances of the mongod process dying unexpectedly with no message in the log file.  In each instance, the last message in the log file was &lt;tt&gt;about to log metadata event&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;In each episodes the mongod in question has been a member of a shard in a cluster.  The episodes were observed on three separate physical servers.&lt;/p&gt;

&lt;p&gt;Log files attached.&lt;/p&gt;

&lt;p&gt;In the third episode dmesg said the following:&lt;/p&gt;

&lt;p/&gt;
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					&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;mongod        D 0000000000000001     0 29664  29663 0x00000080&lt;/span&gt;&lt;/pre&gt;
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					&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; [&amp;lt;ffffffffa00745c5&amp;gt;] jbd2_log_wait_commit+0xc5/0x140 [jbd2]&lt;/span&gt;&lt;/pre&gt;
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					&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; [&amp;lt;ffffffffa009409c&amp;gt;] ext4_sync_file+0x13c/0x250 [ext4]&lt;/span&gt;&lt;/pre&gt;
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					&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; [&amp;lt;ffffffff811a57a1&amp;gt;] vfs_fsync_range+0xa1/0xe0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&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; [&amp;lt;ffffffff811a58e0&amp;gt;] sys_fsync+0x10/0x20&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&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; [&amp;lt;ffffffff8100b0f2&amp;gt;] system_call_fastpath+0x16/0x1b&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="128431">SERVER-13410</key>
            <summary>split does not install metadata under the dblock</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="greg_10gen">Greg Studer</assignee>
                                    <reporter username="cailin.nelson@mongodb.com">Cailin Nelson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 31 Mar 2014 02:05:24 +0000</created>
                <updated>Mon, 11 Jul 2016 17:17:09 +0000</updated>
                            <resolved>Tue, 1 Apr 2014 20:00:36 +0000</resolved>
                                    <version>2.6.0-rc2</version>
                                    <fixVersion>2.6.0-rc3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="530934" author="xgen-internal-githook" created="Tue, 1 Apr 2014 15:04:43 +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-13410&quot; title=&quot;split does not install metadata under the dblock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13410&quot;&gt;&lt;del&gt;SERVER-13410&lt;/del&gt;&lt;/a&gt; metadata changes in dblock&lt;br/&gt;
(cherry picked from commit c4f3416806135c1d2d3289a0648fc9dc754a0adf)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b3c2e5171b558bfa76bab83a36083eac5d5c363b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b3c2e5171b558bfa76bab83a36083eac5d5c363b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="530929" author="xgen-internal-githook" created="Tue, 1 Apr 2014 15:03:35 +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-13410&quot; title=&quot;split does not install metadata under the dblock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13410&quot;&gt;&lt;del&gt;SERVER-13410&lt;/del&gt;&lt;/a&gt; metadata changes in dblock&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c4f3416806135c1d2d3289a0648fc9dc754a0adf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c4f3416806135c1d2d3289a0648fc9dc754a0adf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="530850" author="greg_10gen" created="Tue, 1 Apr 2014 14:18:15 +0000"  >&lt;p&gt;Tentative summary -&lt;/p&gt;

&lt;p&gt;It&apos;s important that mongod collection metadata changes don&apos;t happen outside the db write lock - this allows metadata users to make certain assumptions about when it is safe to write.  This is/was the case for all metadata changes &lt;b&gt;except&lt;/b&gt; for split, which did not previously cause problems because the only information write operations used was (a copy of) the shard version &lt;b&gt;and&lt;/b&gt; because split does not change the logical ranges tracked.&lt;/p&gt;

&lt;p&gt;In 2.6, we now use FieldRef information cached inside the collection metadata to validate updates.  This is to ensure we don&apos;t change shard key fields, and updates assume the FieldRefs will be valid so long as the lock is held.  On split, this isn&apos;t the case, so think this is what is causing the crashing (and maybe silent and incorrect update validation).&lt;/p&gt;
</comment>
                            <comment id="530076" author="greg_10gen" created="Mon, 31 Mar 2014 22:25:37 +0000"  >&lt;p&gt;The changelogs of the first two configs agree, there are no changelog entries for any of the three crashes.  This means that the clusterWrite is not actually getting sent, and should narrow things down considerably.&lt;/p&gt;</comment>
                    </comments>
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