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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-26954] mongoD 3.2.10 crashes with Invariant failure false src\mongo\db\storage\mmap_v1\btree\btree_logic.cpp 1746</title>
                <link>https://jira.mongodb.org/browse/SERVER-26954</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Environment:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Mongo 3.2.10&lt;/li&gt;
	&lt;li&gt;Windows Server 2012&lt;/li&gt;
	&lt;li&gt;Replicaset with 2 mongoD&apos;s (mmapv1) + arbiter&lt;/li&gt;
	&lt;li&gt;Cluster with 3 config servers in CSRS + mongoS&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;After we upgraded from 3.0.4 to 3.2.10, we&apos;re seeing one of the 2 mongoD&apos;s constantly crashing. Here&apos;s the relevant entries in mongod.log:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;2016-11-01T10:20:26.800-0700 I -        [repl writer worker 13] Invariant failure false src\mongo\db\storage\mmap_v1\btree\btree_logic.cpp 1746^M&lt;/span&gt;&lt;/pre&gt;
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						&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;   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;2016-11-01T10:20:26.800-0700 I -        [repl writer worker 13] ^M&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="330499">SERVER-26954</key>
            <summary>mongoD 3.2.10 crashes with Invariant failure false src\mongo\db\storage\mmap_v1\btree\btree_logic.cpp 1746</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="4">Incomplete</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="alessandro.gherardi@yahoo.com">Alessandro Gherardi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Nov 2016 18:24:12 +0000</created>
                <updated>Fri, 9 Dec 2016 21:24:13 +0000</updated>
                            <resolved>Fri, 18 Nov 2016 20:06:41 +0000</resolved>
                                                                    <component>MMAPv1</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1437952" author="thomas.schubert" created="Fri, 18 Nov 2016 20:06:41 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alessandro.gherardi%40yahoo.com&quot; class=&quot;user-hover&quot; rel=&quot;alessandro.gherardi@yahoo.com&quot;&gt;alessandro.gherardi@yahoo.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for following up. I&apos;m glad to hear that the issue has been resolved.&lt;/p&gt;

&lt;p&gt;In cases like this it is very challenging to track down the root cause. Unfortunately, there is not enough information at this time to complete an investigation to determine whether there is a bug in the server or if faulty memory or storage explains this behavior. If you experience this again, please save the data files and reopen this ticket so we can continue to investigate.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1429687" author="alessandro.gherardi@yahoo.com" created="Tue, 8 Nov 2016 20:55:22 +0000"  >&lt;p&gt;Thanks.&lt;/p&gt;

&lt;p&gt;To answer your questions:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;I don&apos;t know for sure. My guess is that is was the &quot;events&quot; collection - it&apos;s by far the largest we have.&lt;/li&gt;
	&lt;li&gt;We followed the steps listed here &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/3.2-upgrade/#upgrade-a-sharded-cluster-to-3-2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/release-notes/3.2-upgrade/#upgrade-a-sharded-cluster-to-3-2&lt;/a&gt; then &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/upgrade-config-servers-to-replica-set&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/tutorial/upgrade-config-servers-to-replica-set&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;Should I attach the logs to this ticket? Or do you have an FTP or some other location I can upload them to?&lt;/li&gt;
	&lt;li&gt;Are you referring to event viewer -&amp;gt; Windows Logs -&amp;gt; System? The only event at the time of the first failure is this: Service Control Manager,7031,None,The MongoD service terminated unexpectedly.&#160; It has done this 1 time(s).&#160; The following corrective action will be taken in 10000 milliseconds: Restart the service.&lt;/li&gt;
	&lt;li&gt;I no longer have the data files. I do have the mongoD minidumps. Are those useful? If yes, please let me know how to send them to you.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The initial sync appears to have resolved the problem.&lt;/p&gt;</comment>
                            <comment id="1429618" author="thomas.schubert" created="Tue, 8 Nov 2016 19:53:24 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alessandro.gherardi%40yahoo.com&quot; class=&quot;user-hover&quot; rel=&quot;alessandro.gherardi@yahoo.com&quot;&gt;alessandro.gherardi@yahoo.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for reporting this issue. So we can continue to investigate would you please provide us with some additional information?&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Are you aware of which index or collection was being accessed?&lt;/li&gt;
	&lt;li&gt;What was the upgrade procedure?&lt;/li&gt;
	&lt;li&gt;Would you please upload the complete logs of the affected node?&lt;/li&gt;
	&lt;li&gt;Are there are errors in the system logs?&lt;/li&gt;
	&lt;li&gt;Would you please create a copy of your data files? It is possible that we may want to examine them to better determine what is going on here.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;To resolve this issue, I would recommend executing an &lt;a href=&quot;https://docs.mongodb.com/v3.2/tutorial/resync-replica-set-member/#automatically-sync-a-member&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;initial sync&lt;/a&gt;. If an initial sync is not feasible with your load and configuration, I would suggest starting the affected node with &lt;tt&gt;mongod --repair&lt;/tt&gt;,&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1429539" author="alessandro.gherardi@yahoo.com" created="Tue, 8 Nov 2016 18:55:51 +0000"  >&lt;p&gt;Also notice that, before the upgrade, the system had been running on 3.0.4 since at least 2016-10-19, without any crashes.&lt;/p&gt;</comment>
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