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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-34972] Unable to start standalone MongoDB instance due to checksum mismatch in WiredTiger storage engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-34972</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a standalone MongoDB instance. It was working fine till today. When I tried to restart the DB, I am getting error saying there is a checksum mismatch in the WiredTiger.wt file. I dont know the exact reason as to why the data got corrupted.&#160;&lt;/p&gt;

&lt;p&gt;&#160;I tried to repair the DB but to no avail. I am getting the same error. I also tried the wiredtiger tool at &lt;a href=&quot;http://source.wiredtiger.com/3.0.0/command_line.html.&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://source.wiredtiger.com/3.0.0/command_line.html.&lt;/a&gt;&#160;But it is also giving the same error.&lt;/p&gt;

&lt;p&gt;It seems there are a lot of such corruption issues and it was being said that the issue would not occur post 3.2 version. I am having 3.4.0 version and still getting the issue.&lt;/p&gt;

&lt;p&gt;I am attaching the required files and any help to recover the data would be deeply appreciated.&lt;/p&gt;

&lt;p&gt;Please feel free to ask me anything else that would be required.&lt;/p&gt;

&lt;p&gt;Please find below the errors (IT IS GIVING DIFFERENT &lt;font color=&quot;#FF0000&quot;&gt;CHECKSUMS&lt;/font&gt; AT DIFFERENT TIME OF RESTART EVEN THOUGH NOTHING IN THE DB HAS BEEN CHANGED) -&lt;/p&gt;

&lt;p&gt;1ST TIME OF RESTART&lt;/p&gt;

&lt;p&gt;2018-05-13T17:03:39.809+0530 I STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; wiredtiger_open config: create,cache_size=3313M,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),&lt;br/&gt;
2018-05-13T17:03:39.830+0530 E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (0) &lt;span class=&quot;error&quot;&gt;&amp;#91;1526211219:830804&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;593:0x7f97fc28dc80&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 24576: &lt;font color=&quot;#d04437&quot;&gt;block header checksum of 1793761607 doesn&apos;t match expected checksum of 3070115156&lt;/font&gt;&lt;br/&gt;
2018-05-13T17:03:39.830+0530 E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (0) &lt;span class=&quot;error&quot;&gt;&amp;#91;1526211219:830842&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;593:0x7f97fc28dc80&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&lt;br/&gt;
2018-05-13T17:03:39.830+0530 E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (-31804) &lt;span class=&quot;error&quot;&gt;&amp;#91;1526211219:830860&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;593:0x7f97fc28dc80&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;br/&gt;
2018-05-13T17:03:39.830+0530 I - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; Fatal Assertion 28558 at src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp 361&lt;br/&gt;
2018-05-13T17:03:39.830+0530 I - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;***aborting after fassert() failure&lt;/p&gt;


&lt;p&gt;2018-05-13T17:03:39.850+0530 F - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; Got signal: 6 (Aborted).&lt;/p&gt;

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

&lt;p&gt;2ND TIME OF RESTART&lt;/p&gt;

&lt;p&gt;2018-05-13T23:03:29.765+0530 I STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; wiredtiger_open config: create,cache_size=3313M,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),&lt;br/&gt;
2018-05-13T23:03:29.785+0530 E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (0) &lt;span class=&quot;error&quot;&gt;&amp;#91;1526232809:785143&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;20203:0x7f32ca8fbc80&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 24576: &lt;font color=&quot;#d04437&quot;&gt;block header checksum of 1793761607 doesn&apos;t match expected checksum of 1666091971&lt;/font&gt;&lt;br/&gt;
2018-05-13T23:03:29.785+0530 E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (0) &lt;span class=&quot;error&quot;&gt;&amp;#91;1526232809:785225&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;20203:0x7f32ca8fbc80&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&lt;br/&gt;
2018-05-13T23:03:29.785+0530 E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (-31804) &lt;span class=&quot;error&quot;&gt;&amp;#91;1526232809:785278&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;20203:0x7f32ca8fbc80&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;br/&gt;
2018-05-13T23:03:29.785+0530 I - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; Fatal Assertion 28558 at src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp 361&lt;br/&gt;
2018-05-13T23:03:29.785+0530 I - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;***aborting after fassert() failure&lt;/p&gt;


&lt;p&gt;2018-05-13T23:03:29.806+0530 F - &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; Got signal: 6 (Aborted).&lt;/p&gt;

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

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

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="543199">SERVER-34972</key>
            <summary>Unable to start standalone MongoDB instance due to checksum mismatch in WiredTiger storage engine</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="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="Vikram">Snehadeep [X]</reporter>
                        <labels>
                    </labels>
                <created>Sun, 13 May 2018 19:52:22 +0000</created>
                <updated>Sun, 10 Jun 2018 10:02:19 +0000</updated>
                            <resolved>Fri, 18 May 2018 18:13:32 +0000</resolved>
                                    <version>3.4.0</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1895633" author="thomas.schubert" created="Fri, 18 May 2018 18:13:21 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Vikram&quot; class=&quot;user-hover&quot; rel=&quot;Vikram&quot;&gt;Vikram&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Unfortunately, this behavior likely indicates that there was corruption on the disk, most often caused by a faulty storage layer. In this situation, our best recommendation would be to &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/resync-replica-set-member/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;resync the affected node&lt;/a&gt; or &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;restore from a backup&lt;/a&gt; if possible. If you have a copy of the original files prior to any attempted salvage operations, I would suggest starting mongod with the repair attempt against these files.&lt;/p&gt;

&lt;p&gt;To prevent this type of problem in the future please take note of the following guidelines to help mitigate any 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;Thank you,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1895296" author="vikram" created="Fri, 18 May 2018 14:57:50 +0000"  >&lt;p&gt;Hi Kelsey,&lt;/p&gt;

&lt;p&gt;We are really pressed for time. Can you please provide solution? We have tried many suggestions online and nothing is working.&lt;/p&gt;</comment>
                            <comment id="1892523" author="vikram" created="Wed, 16 May 2018 08:24:22 +0000"  >&lt;p&gt;Hi Kelsey,&lt;/p&gt;

&lt;p&gt;I tried using the wt tool to recover the data. But, it is showing the count correctly but not the records. If I try to find the records, its showing empty. I tried the repair command also. But not able to recover the records.&lt;/p&gt;

&lt;p&gt;Can you please provide any other suggestion as to how to recover the records?&lt;/p&gt;</comment>
                            <comment id="1891342" author="vikram" created="Tue, 15 May 2018 08:35:28 +0000"  >&lt;p&gt;Hi Kelsey,&lt;/p&gt;

&lt;p&gt;Thanks. I was able to start the MongoDB with the repair_attempt files. But when I see the recovered data, there is not even 5% of the data that is recovered. Before this issue, we had around 1.5 lac records and after recovery, we have only 127 records.&lt;/p&gt;

&lt;p&gt;I will try running the wt command line tool. But if there is any other way to recover the records, please let me know. Any help would be appreciated.&lt;/p&gt;</comment>
                            <comment id="1890919" author="thomas.schubert" created="Mon, 14 May 2018 19:36:21 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Vikram&quot; class=&quot;user-hover&quot; rel=&quot;Vikram&quot;&gt;Vikram&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for your report. I&apos;ve attached a repair attempt,  &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/186762/186762_repair_attempt.tar.gz&quot; title=&quot;repair_attempt.tar.gz attached to SERVER-34972&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;, of the files you provided. Please extract these files and replace them in your &lt;tt&gt;$dbpath&lt;/tt&gt; and let us know if it resolves the issue. If you are still seeing errors after replacing these files, please provide the complete logs from the affected node so that we can further investigate.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="543651">SERVER-34987</issuekey>
        </issuelink>
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                <attachments>
                            <attachment id="186680" name="WiredTiger.turtle" size="988" author="Vikram" created="Sun, 13 May 2018 19:33:44 +0000"/>
                            <attachment id="186682" name="WiredTiger.wt" size="212992" author="Vikram" created="Sun, 13 May 2018 19:33:45 +0000"/>
                            <attachment id="186681" name="_mdb_catalog.wt" size="45056" author="Vikram" created="Sun, 13 May 2018 19:33:45 +0000"/>
                            <attachment id="186762" name="repair_attempt.tar.gz" size="13105" author="kelsey.schubert@mongodb.com" created="Mon, 14 May 2018 19:35:34 +0000"/>
                            <attachment id="186683" name="sizeStorer.wt" size="45056" author="Vikram" created="Sun, 13 May 2018 19:33:45 +0000"/>
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