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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-27246] Running applyOps with an op on a nonexistent database using mmapv1 will crash mongod</title>
                <link>https://jira.mongodb.org/browse/SERVER-27246</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;See repro steps.&lt;/p&gt;

&lt;p&gt;This crashes because we attempt to construct an OldClientContext while in an active WriteUnitOfWork.&lt;br/&gt;
OldClientContext will attempt to create a database if it doesn&apos;t exist.&lt;br/&gt;
Creating a database on mmapv1 will attempt to allocate a new ns file, and then try to flush the journal manually.&lt;br/&gt;
Flushing the journal requires the flush lock, which invariants that we are not in a WriteUnitOfWork.&lt;/p&gt;</description>
                <environment></environment>
        <key id="335450">SERVER-27246</key>
            <summary>Running applyOps with an op on a nonexistent database using mmapv1 will crash mongod</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="9">Done</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Dec 2016 13:54:01 +0000</created>
                <updated>Fri, 15 Apr 2022 19:30:09 +0000</updated>
                            <resolved>Mon, 5 Dec 2016 18:24:34 +0000</resolved>
                                    <version>3.3.8</version>
                                    <fixVersion>3.4.1</fixVersion>
                    <fixVersion>3.5.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1449499" author="xgen-internal-githook" created="Mon, 5 Dec 2016 18:29:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27246&quot; title=&quot;Running applyOps with an op on a nonexistent database using mmapv1 will crash mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27246&quot;&gt;&lt;del&gt;SERVER-27246&lt;/del&gt;&lt;/a&gt; fix atomic applyOps with nonexistent dbs&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0b9be138fb58ea4ef2ca77ddebf53b6c76238a13)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/315f18af97c00abd9d84aa5d09ff18a8a33d57d6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/315f18af97c00abd9d84aa5d09ff18a8a33d57d6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1449490" author="xgen-internal-githook" created="Mon, 5 Dec 2016 18:23:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27246&quot; title=&quot;Running applyOps with an op on a nonexistent database using mmapv1 will crash mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27246&quot;&gt;&lt;del&gt;SERVER-27246&lt;/del&gt;&lt;/a&gt; fix atomic applyOps with nonexistent dbs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0b9be138fb58ea4ef2ca77ddebf53b6c76238a13&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0b9be138fb58ea4ef2ca77ddebf53b6c76238a13&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1446837" author="milkie" created="Thu, 1 Dec 2016 14:45:06 +0000"  >&lt;p&gt;This will only affect applyOps invocations that expect to create collections implicitly (via insert/updates to a non-existent collection).  This bug doesn&apos;t affect users that are replaying oplog entries because replication always explictly creates collections.&lt;/p&gt;

&lt;p&gt;One proposed solution to this is to detect when a database is missing, throw an exception, and then restart the applyOps command from scratch but in non-atomic mode.  Non-atomic mode is already used for any applyOps arrays that contain &apos;c&apos; ops.&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="274690">SERVER-23326</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="420364">SERVER-30830</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1988585">SERVER-63907</issuekey>
        </issuelink>
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&lt;p/&gt;
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