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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-7564] mongos crash (segfault) under load</title>
                <link>https://jira.mongodb.org/browse/SERVER-7564</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The work:&lt;br/&gt;
We are testing mongo for production. Right now we do only write operations, with 50 threads simultaneously. Each document is about 190bytes.  We have 2 shards, and each of those two shards is a replica set with 2 members and 1 arbiter. Sharding is based on a UUID so it&apos;s pretty random. After the crash had 40280474 documents which results to about 2K inserts per second, perhaps low for this h/w. &lt;/p&gt;

&lt;p&gt;What happened:&lt;br/&gt;
After about 5 hours of normal operation, mongos crashed with segfault. All logs are attached. (from mongos and the shards). The shards stayed operational and replica sets reported no errors when connecting to them directly after the crash. The db seems operational after mongos restart. This was our first test.&lt;/p&gt;</description>
                <environment>Debian 6.0 Linux vserver-dev-2  2.6.32-5-xen-amd64 #1 SMP Sun Sep 23 13:49:30 UTC 2012 x86_64 GNU/Linux, Intel E5645, HP ProLiant DL360 G7, 8GB mem. 10Krpm sata raid0&lt;br/&gt;
&lt;br/&gt;
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        <key id="55366">SERVER-7564</key>
            <summary>mongos crash (segfault) under load</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="3">Duplicate</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="sivann">Spiros Ioannou</reporter>
                        <labels>
                            <label>crash</label>
                            <label>mongos</label>
                    </labels>
                <created>Tue, 6 Nov 2012 09:18:57 +0000</created>
                <updated>Fri, 15 Feb 2013 15:05:43 +0000</updated>
                            <resolved>Tue, 13 Nov 2012 15:57:45 +0000</resolved>
                                    <version>2.2.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="187942" author="sivann" created="Tue, 13 Nov 2012 15:55:36 +0000"  >&lt;p&gt;Well it seems with 2.2.1 no crashes so far. Somebody mark it resolved for now.&lt;/p&gt;</comment>
                            <comment id="183015" author="sivann" created="Tue, 6 Nov 2012 15:24:43 +0000"  >&lt;p&gt;thanks, I will try with 2.2.1&lt;/p&gt;</comment>
                            <comment id="182999" author="renctan" created="Tue, 6 Nov 2012 15:04:29 +0000"  >&lt;p&gt;It looks like you ran into &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7061&quot; title=&quot;mongos can use invalid ptr to master conn when setShardVersion fails&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7061&quot;&gt;&lt;del&gt;SERVER-7061&lt;/del&gt;&lt;/a&gt;. Is it possible to try this in 2.2.1 and see if this still occurs?&lt;/p&gt;</comment>
                            <comment id="182911" author="sivann" created="Tue, 6 Nov 2012 09:49:14 +0000"  >&lt;p&gt;You may need to open the mongos logfile with vim since it contains binary chars and the usual gui editors hide part of the data.&lt;/p&gt;</comment>
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                            <attachment id="21396" name="mongodb.tar.gz" size="4300353" author="sivann" created="Tue, 6 Nov 2012 09:18:57 +0000"/>
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