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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-34858] WiredTiger crash - checksum failed</title>
                <link>https://jira.mongodb.org/browse/SERVER-34858</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hey,&lt;/p&gt;

&lt;p&gt;we are using MongoDB within a machine learning project in Python. After starting the Python-script everything runs perfect first until at some point MongoDB crashes. It seems pretty random at which point that happens but it has happend three times in a row, now.&lt;/p&gt;

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

&lt;p&gt;We are using MongoDB inside a Docker container and am currently using the image mongo:latest. The used server version is 3.6.4.&lt;/p&gt;

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

&lt;p&gt;The message says that the calculated block checksum doesn&apos;t match the expected checksum. I will append the log at this issue. Unfortunately, we don&apos;t know why and when this error happens. The script is basically a loop iterating over the data, feeding it into a machine learning model and writing results back into MongoDB. It&apos;s always the same code that gets executed inside the loop but at some random iteration MongoDB crashes.&lt;/p&gt;

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

&lt;p&gt;I hope you can help me because we really don&apos;t know how we can find and fix that issue.&lt;/p&gt;</description>
                <environment>Host system: Ubuntu 16.04.4 with 32GB RAM (But MongoDB runs inside Docker-image)</environment>
        <key id="539610">SERVER-34858</key>
            <summary>WiredTiger crash - checksum failed</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="backlog-server-triage">Backlog - Triage Team</assignee>
                                    <reporter username="florian.krebs">Florian Krebs</reporter>
                        <labels>
                    </labels>
                <created>Sat, 5 May 2018 11:27:52 +0000</created>
                <updated>Tue, 6 Dec 2022 03:30:20 +0000</updated>
                            <resolved>Wed, 9 May 2018 14:52:17 +0000</resolved>
                                    <version>3.6.4</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1887064" author="florian.krebs" created="Wed, 9 May 2018 14:55:30 +0000"  >&lt;p&gt;Okay,&lt;/p&gt;

&lt;p&gt;thank you. I will first try it with volumes and if that doesn&apos;t work open a thread in the group.&lt;/p&gt;</comment>
                            <comment id="1887061" author="ramon.fernandez" created="Wed, 9 May 2018 14:52:07 +0000"  >&lt;p&gt;I tried to reproduce this on macOS and Linux with no success. I&apos;m no Docker expert, but (assuming the host&apos;s storage layer is healthy) you may want to try with a volume instead of a bind mount first.&lt;/p&gt;

&lt;p&gt;Please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;, where your question will reach a larger audience. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;. See also our &lt;a href=&quot;https://www.mongodb.org/about/support/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Support page&lt;/a&gt; for additional support resources.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1887023" author="florian.krebs" created="Wed, 9 May 2018 14:32:24 +0000"  >&lt;p&gt;It seems that it isn&apos;t possible for me to install MongoDB on the host machine directly. So is there anything I can do to prevent that issue from happening when running MongoDB in a Docker container?&lt;/p&gt;</comment>
                            <comment id="1884429" author="florian.krebs" created="Mon, 7 May 2018 12:59:12 +0000"  >&lt;p&gt;Hey @Ramon Fernandez,&lt;/p&gt;

&lt;p&gt;unfortunately I cannot run MongoDB outside of Docker on this server due to the company policy. I am currently storing the data in a shared volume on an ext4 partition. I am not sure if shared volumes work together with MongoDB though after reading your linked note. Do you have any recommended way of storing data outside of the Mongo-Container? We want to store the data outside of the container so it isn&apos;t lost when cleanup removes stopped containers&lt;/p&gt;

&lt;p&gt;&#160;&lt;br/&gt;
Edit:&lt;br/&gt;
The current command that I use is:&#160;&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;docker run --name &amp;lt;name&amp;gt; -d -v &amp;lt;host directory&amp;gt;:/data/db -p &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;27017&lt;/span&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;:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;27017&lt;/span&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; mongo:latest&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Edit2: If running MongoDB on the host machine is the only way of finding a solution I will talk to the server administrator and ask him if he can temporarily install MongoDB for us.&lt;/p&gt;</comment>
                            <comment id="1884424" author="ramon.fernandez" created="Mon, 7 May 2018 12:49:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=florian.krebs&quot; class=&quot;user-hover&quot; rel=&quot;florian.krebs&quot;&gt;florian.krebs&lt;/a&gt;, the errors you&apos;re seeing seem to indicate that the storage layer is not providing enough durability guarantees; this typically happens when &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/#fsync-on-directories&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;fsync()&lt;/tt&gt; doesn&apos;t work as expected&lt;/a&gt;, which happens in shared mounts.&lt;/p&gt;

&lt;p&gt;Are you able to reproduce these issues outside of Docker?&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="186092" name="MongoDB-error.log" size="37267" author="florian.krebs" created="Sat, 5 May 2018 11:24:39 +0000"/>
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