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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-35577] read checksum error on wiredTiger.wt</title>
                <link>https://jira.mongodb.org/browse/SERVER-35577</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;we have an error in our WiredTiger.wt file and can not start our database anymore. Can you please help us with this problem?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;We get the following error:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;1528707963:669364&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;119248:0x7fbf92551740&amp;#93;&lt;/span&gt;, &lt;a href=&quot;file:WiredTiger.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:WiredTiger.wt&lt;/a&gt;, connection: read checksum error for 4096B block at offset 12288: block header checksum of 2896414579 doesn&apos;t match expected checksum of 3327239497&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;1528707963:669386&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;119248:0x7fbf92551740&amp;#93;&lt;/span&gt;, &lt;a href=&quot;file:WiredTiger.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:WiredTiger.wt&lt;/a&gt;, connection: WiredTiger.wt: encountered an illegal file format or internal value: (__wt_block_read_off, 227)&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;1528707963:669391&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;119248:0x7fbf92551740&amp;#93;&lt;/span&gt;, &lt;a href=&quot;file:WiredTiger.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:WiredTiger.wt&lt;/a&gt;, connection: the process must exit and restart: WT_PANIC: WiredTiger library panic&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;It is a production error, the removal of which is very urgent&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;thanks a lot for your support&lt;/p&gt;</description>
                <environment></environment>
        <key id="558485">SERVER-35577</key>
            <summary>read checksum error on wiredTiger.wt</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="nick.brewer">Nick Brewer</assignee>
                                    <reporter username="kle">Mandy Klein</reporter>
                        <labels>
                            <label>envns</label>
                            <label>rns</label>
                            <label>rps</label>
                            <label>trcf</label>
                            <label>wtc</label>
                    </labels>
                <created>Wed, 13 Jun 2018 14:22:48 +0000</created>
                <updated>Tue, 14 Aug 2018 00:49:06 +0000</updated>
                            <resolved>Fri, 15 Jun 2018 18:29:21 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1922178" author="nick.brewer" created="Fri, 15 Jun 2018 18:27:36 +0000"  >&lt;p&gt;Hi Mandy, &lt;/p&gt;

&lt;p&gt;What I did was basically a &lt;tt&gt;wt&lt;/tt&gt; salvage on the two files you supplied.&lt;/p&gt;

&lt;p&gt;I&apos;m glad you were able to get most of your data back. For future reference, here&apos;s some precautions you can take to mitigate issues related to unreliable storage layers or server failures:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Make sure your &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/#disk-and-storage-systems&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;underlying storage is configured in an optimal way&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;Schedule and perform regular checks of the integrity of your filesystems and disks.&lt;/li&gt;
	&lt;li&gt;Make sure to update MongoDB to the &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;most recent version&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;Never manipulate the underlying database files in any way while &lt;tt&gt;mongod&lt;/tt&gt; is running.&lt;/li&gt;
	&lt;li&gt;Always keep up to date &lt;a href=&quot;https://docs.mongodb.com/manual/core/backups/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;backups of your databases&lt;/a&gt; and verify that you have a process in place to restore them.&lt;/li&gt;
	&lt;li&gt;Use a &lt;a href=&quot;https://docs.mongodb.com/manual/replication/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replica set&lt;/a&gt; for improved reliability.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Nick&lt;/p&gt;

</comment>
                            <comment id="1921691" author="kle" created="Fri, 15 Jun 2018 13:43:47 +0000"  >&lt;p&gt;Hello,&lt;/p&gt;

&lt;p&gt;we were able to reboot the database with the help of the files, but could not access the data as a whole.&lt;/p&gt;

&lt;p&gt;we also needed to clean up the files, using salvage. See also:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.alexbevi.com/blog/2016/02/10/recovering-a-wiredtiger-collection-from-a-corrupt-mongodb-installation/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.alexbevi.com/blog/2016/02/10/recovering-a-wiredtiger-collection-from-a-corrupt-mongodb-installation/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;After that, we lost a small amount of data but were able to save the bulk.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Thanks for your quick support, mayve youcan also tell me what you needed to change about the data?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Best regards&lt;/p&gt;

&lt;p&gt;Mandy&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="1920770" author="nick.brewer" created="Thu, 14 Jun 2018 15:59:36 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;I&apos;ve attached the files after a repair attempt. Would you please extract these files, substitute them for the current ones in your &lt;tt&gt;$dbpath&lt;/tt&gt;, and let us know if it resolves the issue?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Nick&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/189469/189469_repair-attempt.tar.gz&quot; title=&quot;repair-attempt.tar.gz attached to SERVER-35577&quot;&gt;repair-attempt.tar.gz&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;
</comment>
                            <comment id="1920397" author="kle" created="Thu, 14 Jun 2018 05:32:16 +0000"  >&lt;p&gt;@nick Brewer, wiredtiger.turtle file is uploaded&lt;/p&gt;</comment>
                            <comment id="1919902" author="nick.brewer" created="Wed, 13 Jun 2018 18:39:44 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kle&quot; class=&quot;user-hover&quot; rel=&quot;kle&quot;&gt;kle&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Could you upload the &lt;tt&gt;wiredtiger.turtle&lt;/tt&gt; file as well? This will be necessary in order to attempt to recover the file. &lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Nick&lt;/p&gt;</comment>
                            <comment id="1919514" author="milkie" created="Wed, 13 Jun 2018 14:40:19 +0000"  >&lt;p&gt;I moved your request to the SERVER project.  The WiredTiger project is for consumers of the standalone WiredTiger storage engine.&lt;/p&gt;</comment>
                            <comment id="1919510" author="kle" created="Wed, 13 Jun 2018 14:37:16 +0000"  >&lt;p&gt;@keith.bostic, its a MongoDB insallation&lt;/p&gt;</comment>
                            <comment id="1919500" author="keith.bostic" created="Wed, 13 Jun 2018 14:33:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kle&quot; class=&quot;user-hover&quot; rel=&quot;kle&quot;&gt;kle&lt;/a&gt;, is this a MongoDB installation, or a standalone WiredTiger installation?&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="189443" name="WiredTiger.turtle" size="956" author="kle" created="Thu, 14 Jun 2018 05:31:33 +0000"/>
                            <attachment id="189363" name="WiredTiger.wt" size="49152" author="kle" created="Wed, 13 Jun 2018 14:23:08 +0000"/>
                            <attachment id="189469" name="repair-attempt.tar.gz" size="2533" author="nick.brewer" created="Thu, 14 Jun 2018 15:59:32 +0000"/>
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