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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-30544] fsynclock results in corrupt disk snapshot</title>
                <link>https://jira.mongodb.org/browse/SERVER-30544</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am using server 3.2.12/3.4.3. FsyncLock() commands appear to corrupt the disk data such that a snapshot taken at this time does not work.  The data files exist but wiredtiger ignores them - so it might be some issue with the on disk catalog&lt;/p&gt;

&lt;p&gt;I am using latest version of mongodb java driver so it is unrelated to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28876&quot; title=&quot;fsyncLock results in corrupt disk snapshot&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28876&quot;&gt;&lt;del&gt;SERVER-28876&lt;/del&gt;&lt;/a&gt;,&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;. &lt;/p&gt;

&lt;p&gt;I am able to reproduce the issue with reasonable consistently (doesn&apos;t happen every time). 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;The lock and unlock steps appear to work and trace in the log &lt;/p&gt;

&lt;p&gt;I have attached two files&lt;br/&gt;
1. Succes.zip - successful snapshot&lt;br/&gt;
2. fail.zip - Failed snapshot&lt;/p&gt;

&lt;p&gt;The database &quot;test.test&quot; does not show up in fail.zip. The underlying file fpr this collection is collection-18--3756087474573173486.wt which is present in both the snapshots&lt;/p&gt;

&lt;p&gt;Using the wt command line tool directly confirms that wiredtiger does not see this table even though the file exists&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;root@SG-az34rs1-1097 wiredtiger-2.7.0&amp;#93;&lt;/span&gt;# ./wt -v -h ..&amp;lt;path&amp;gt; -C &quot;extensions=&lt;span class=&quot;error&quot;&gt;&amp;#91;./ext/compressors/snappy/.libs/libwiredtiger_snappy.so&amp;#93;&lt;/span&gt;&quot; list&lt;br/&gt;
colgroup:_mdb_catalog&lt;br/&gt;
colgroup:collection-0--2721376547481716549&lt;br/&gt;
colgroup:collection-2--2721376547481716549&lt;br/&gt;
colgroup:index-1--2721376547481716549&lt;br/&gt;
colgroup:index-3--2721376547481716549&lt;br/&gt;
colgroup:sizeStorer&lt;br/&gt;
&lt;a href=&quot;file:_mdb_catalog.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:_mdb_catalog.wt&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;file:collection-0--2721376547481716549.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:collection-0--2721376547481716549.wt&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;file:collection-2--2721376547481716549.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:collection-2--2721376547481716549.wt&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;file:index-1--2721376547481716549.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:index-1--2721376547481716549.wt&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;file:index-3--2721376547481716549.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:index-3--2721376547481716549.wt&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;file:sizeStorer.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:sizeStorer.wt&lt;/a&gt;&lt;br/&gt;
table:_mdb_catalog&lt;br/&gt;
table:collection-0--2721376547481716549&lt;br/&gt;
table:collection-2--2721376547481716549&lt;br/&gt;
table:index-1--2721376547481716549&lt;br/&gt;
table:index-3--2721376547481716549&lt;br/&gt;
table:sizeStorer &lt;/p&gt;</description>
                <environment></environment>
        <key id="413586">SERVER-30544</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="5">Cannot Reproduce</resolution>
                                        <assignee username="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="dharshanr@scalegrid.net">Dharshan Rangegowda</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Aug 2017 21:42:39 +0000</created>
                <updated>Mon, 9 Oct 2017 17:01:54 +0000</updated>
                            <resolved>Fri, 15 Sep 2017 20:12:20 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1674416" author="mark.agarunov" created="Fri, 15 Sep 2017 20:12:09 +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 detailed report. Unfortunately I have not been able to reproduce this behavior following the steps you outlined. If more information comes to light, please let me know and we can reopen this ticket.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="162762" name="fail.zip" size="3206546" author="dharshanr@scalegrid.net" created="Mon, 7 Aug 2017 21:40:20 +0000"/>
                            <attachment id="162763" name="success.zip" size="1967437" author="dharshanr@scalegrid.net" created="Mon, 7 Aug 2017 21:40:08 +0000"/>
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