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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-32127] segmentation Fault</title>
                <link>https://jira.mongodb.org/browse/SERVER-32127</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running MongoDB Enterprise (3.4.10) on suse 12 with YCSB workload.&lt;br/&gt;
Every time I try to run the MongoDB with multiple threads, I get the segmentation fault.&lt;br/&gt;
Command: &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;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;./bin/mongod --storageEngine wiredTiger --wiredTigerEngineConfigString &quot;cache_size=200GB,eviction=(threads_min=4,threads_max=16)&quot;  --dbpath  /mnt/nvme0n1/db --logpath /mnt/nvme0n1/logs/mongo.log&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;Your help is appreciated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="465969">SERVER-32127</key>
            <summary>segmentation Fault</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="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="ayam2011">Maria Malik</reporter>
                        <labels>
                            <label>RF</label>
                    </labels>
                <created>Thu, 30 Nov 2017 18:16:34 +0000</created>
                <updated>Mon, 5 Feb 2018 21:37:46 +0000</updated>
                            <resolved>Tue, 9 Jan 2018 21:54:25 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1769654" author="mark.agarunov" created="Tue, 9 Jan 2018 21:54:25 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ayam2011&quot; class=&quot;user-hover&quot; rel=&quot;ayam2011&quot;&gt;ayam2011&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1760364" author="mark.agarunov" created="Wed, 27 Dec 2017 20:42:05 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ayam2011&quot; class=&quot;user-hover&quot; rel=&quot;ayam2011&quot;&gt;ayam2011&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Is this still an issue for you? If so, please let us know the outcome of testing on another machine.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1743146" author="ayam2011" created="Tue, 5 Dec 2017 17:13:32 +0000"  >&lt;p&gt;Thank you Mark,&lt;/p&gt;

&lt;p&gt;Let me check on another machine. I will try to get back to you with the response asap.&lt;/p&gt;

&lt;p&gt;Regards,&lt;/p&gt;</comment>
                            <comment id="1739094" author="mark.agarunov" created="Thu, 30 Nov 2017 23:57:52 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ayam2011&quot; class=&quot;user-hover&quot; rel=&quot;ayam2011&quot;&gt;ayam2011&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the information. Looking over this, I believe this error may be caused by corruption on the disk or in memory which is indicated by the &lt;tt&gt;__wt_row_search+0x3F&lt;/tt&gt;. Additionally, from the logs, it appears this is a startup which goes into recovery due to an unclean shutdown. However, if this starts on some attempts but not others, this could suggest memory corruption. To verify this is not due to memory corruption, please copy the dataset to another machine and attempt to run this if possible. &lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1739005" author="ayam2011" created="Thu, 30 Nov 2017 22:27:19 +0000"  >&lt;p&gt;Thank you for your response.&lt;/p&gt;

&lt;p&gt;Does this crash happen at the same point every time? &lt;br/&gt;
&lt;b&gt;I do not believe so, as in 1 out of 10 tries I was able to run the workload successfully but I could not figure out the problem.&lt;/b&gt;&lt;br/&gt;
Which filesystem is being used?&lt;br/&gt;
&lt;b&gt;I am using PCI SSD that I created based on the recommend file system &quot;XFS&quot; with the WiredTiger storage engine&lt;/b&gt;&lt;br/&gt;
How is the underlying storage layer set up (RAID, nfs, physical disk, etc)?&lt;br/&gt;
*Physical Memory: 385GB&lt;br/&gt;
Hard Disk: 2TB*&lt;br/&gt;
Does this behavior happen when running mongodb with an empty dataset?&lt;br/&gt;
&lt;b&gt;No&lt;/b&gt;&lt;br/&gt;
Could you confirm which version of ycsb you are using?&lt;br/&gt;
&lt;b&gt;I am using ycsb version 0.12.0&lt;/b&gt;&lt;br/&gt;
Additionally, please provide the output generated from ycsb. This may have some information that could help diagnose this issue.&lt;br/&gt;
&lt;b&gt;Please refer to the attachment.&lt;/b&gt;&lt;br/&gt;
 &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/172095/172095_mongo.log&quot; title=&quot;mongo.log attached to SERVER-32127&quot;&gt;mongo.log&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;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/172096/172096_ycsb-output.txt&quot; title=&quot;ycsb-output.txt attached to SERVER-32127&quot;&gt;ycsb-output.txt&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;

&lt;p&gt;Appreciate your help.&lt;/p&gt;</comment>
                            <comment id="1738856" author="mark.agarunov" created="Thu, 30 Nov 2017 21:13:00 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ayam2011&quot; class=&quot;user-hover&quot; rel=&quot;ayam2011&quot;&gt;ayam2011&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. Unfortunately I have not yet been able to reproduce this behavior. To get a better idea of what may be causing this, I&apos;d like to ask for some additional information:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Does this crash happen at the same point every time?&lt;/li&gt;
	&lt;li&gt;Which filesystem is being used?&lt;/li&gt;
	&lt;li&gt;How is the underlying storage layer set up (RAID, nfs, physical disk, etc)?&lt;/li&gt;
	&lt;li&gt;Does this behavior happen when running mongodb with an empty dataset?&lt;/li&gt;
	&lt;li&gt;Could you confirm which version of ycsb you are using?&lt;/li&gt;
	&lt;li&gt;Additionally, please provide the output generated from ycsb. This may have some information that could help diagnose this issue.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1738628" author="ayam2011" created="Thu, 30 Nov 2017 18:19:44 +0000"  >&lt;p&gt;Sorry forgot to mention the ycsb command:&lt;br/&gt;
./bin/ycsb run mongodb -s -P workloads/workloadb -p operationcount=10000000 -threads 16&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="172095" name="mongo.log" size="26186" author="ayam2011" created="Thu, 30 Nov 2017 22:26:20 +0000"/>
                            <attachment id="172058" name="mongo.log" size="17339" author="ayam2011" created="Thu, 30 Nov 2017 18:16:19 +0000"/>
                            <attachment id="172096" name="ycsb-output.txt" size="6070" author="ayam2011" created="Thu, 30 Nov 2017 22:26:20 +0000"/>
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