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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-28876] fsyncLock results in corrupt disk snapshot</title>
                <link>https://jira.mongodb.org/browse/SERVER-28876</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am using server 3.2.12. FsyncLock() commands appear to corrupt the disk data such that a snapshot taken at this time does not work.  Once the mongod process starts again on the snapshot disk it appears to ignore all the existing data files - none of the previous databases are shown.&lt;/p&gt;

&lt;p&gt;I am able to reproduce the issue consistently. Here are my steps&lt;br/&gt;
1. Start with a sample data&lt;br/&gt;
2. db.fsyncLock()&lt;br/&gt;
3. Snapshot the disk&lt;br/&gt;
4. db.fsyncUnLock()&lt;/p&gt;

&lt;p&gt;I have attached a .zip of mongodb data folder from my tests. Here is the login credential for initial data&lt;br/&gt;
mongo -u admin -p &quot;K2NU3rNn0YBHX3p1&quot; 127.0.0.1/admin&lt;/p&gt;

&lt;p&gt;1. initialdata.zip - initial data&lt;br/&gt;
2. snapdata.zip - This is the data from the snapshot&lt;br/&gt;
3. dataaftersnaprestart - This is the data after restarting mongod on the snapshot&lt;/p&gt;</description>
                <environment></environment>
        <key id="375704">SERVER-28876</key>
            <summary>fsyncLock results in corrupt disk snapshot</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="3">Duplicate</resolution>
                                        <assignee username="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="dharshanr@scalegrid.net">Dharshan Rangegowda</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 Apr 2017 01:16:21 +0000</created>
                <updated>Wed, 31 May 2017 21:23:26 +0000</updated>
                            <resolved>Mon, 1 May 2017 18:47:22 +0000</resolved>
                                    <version>3.2.12</version>
                                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1561668" author="mark.agarunov" created="Mon, 1 May 2017 18:46:54 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dharshanr%40scalegrid.net&quot; class=&quot;user-hover&quot; rel=&quot;dharshanr@scalegrid.net&quot;&gt;dharshanr@scalegrid.net&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. Looking over the output you&apos;ve provided, this behavior appears to have the same cause as &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-2501&quot; title=&quot;fsyncunlock does not work on secondaries with 3.2.x&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-2501&quot;&gt;&lt;del&gt;JAVA-2501&lt;/del&gt;&lt;/a&gt;. I have closed this ticket as a duplicate, so please follow &lt;a href=&quot;https://jira.mongodb.org/browse/JAVA-2501&quot; title=&quot;fsyncunlock does not work on secondaries with 3.2.x&quot; class=&quot;issue-link&quot; data-issue-key=&quot;JAVA-2501&quot;&gt;&lt;del&gt;JAVA-2501&lt;/del&gt;&lt;/a&gt; for any updates on this issue.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1553780" author="dharshanr@scalegrid.net" created="Thu, 20 Apr 2017 16:13:16 +0000"  >&lt;p&gt;Also I have tried the same steps on 3.2.3 and it works fine.&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="154344" name="dataaftersnaprestart.zip" size="251159" author="dharshanr@scalegrid.net" created="Thu, 20 Apr 2017 01:14:17 +0000"/>
                            <attachment id="154346" name="initialdata.zip" size="341932" author="dharshanr@scalegrid.net" created="Thu, 20 Apr 2017 01:13:03 +0000"/>
                            <attachment id="154345" name="snapdata.zip" size="239661" author="dharshanr@scalegrid.net" created="Thu, 20 Apr 2017 01:13:03 +0000"/>
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