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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-9908] On Linux, Socket::connect() timeout doesn&apos;t interrupt ConnectBG job</title>
                <link>https://jira.mongodb.org/browse/SERVER-9908</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Socket::connect() spawns a ConnectBG job that it interrupts after a 5-second timeout.  However, the job doesn&apos;t get interrupted on Linux (and SO_RCVTIMEO/SO_SNDTIMEO don&apos;t have an effect on connect timeouts in Linux).  Thus, the system default is used as the effective connect timeout (as a function of net.ipv4.tcp_syn_retries).&lt;/p&gt;

&lt;p&gt;This affects all intra-cluster connections made by mongod/mongos (and shell/tools) in failure modes where SYN packets destined to the remote server are silently dropped.&lt;/p&gt;

&lt;p&gt;Reproduce with:&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;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;   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;$ sudo iptables -A INPUT -i lo -p tcp --dport 27017 -j DROP&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;$ mongod --fork --logpath log&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-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;$ mongo&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment>Linux</environment>
        <key id="78749">SERVER-9908</key>
            <summary>On Linux, Socket::connect() timeout doesn&apos;t interrupt ConnectBG job</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Jun 2013 14:13:06 +0000</created>
                <updated>Wed, 9 Oct 2013 05:15:37 +0000</updated>
                            <resolved>Fri, 14 Jun 2013 19:40:37 +0000</resolved>
                                    <version>2.2.4</version>
                    <version>2.4.4</version>
                                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="437924" author="kevin.pulo@10gen.com" created="Wed, 9 Oct 2013 05:15:22 +0000"  >&lt;p&gt;Also, the portion of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9041&quot; title=&quot;proactively detect broken connections detected by the network&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9041&quot;&gt;&lt;del&gt;SERVER-9041&lt;/del&gt;&lt;/a&gt; relevant to this ticket has been backported to 2.4.6.&lt;/p&gt;</comment>
                            <comment id="360551" author="rassi@10gen.com" created="Fri, 14 Jun 2013 19:40:37 +0000"  >&lt;p&gt;This has been fixed in 2.5.0 by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9041&quot; title=&quot;proactively detect broken connections detected by the network&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9041&quot;&gt;&lt;del&gt;SERVER-9041&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="360448" author="rassi@10gen.com" created="Fri, 14 Jun 2013 17:33:03 +0000"  >&lt;p&gt;He&apos;s saying that the 5-second timeout should get enforced, but it&apos;s not getting enforced.  I rewrote the title/description, should clarify the bug.&lt;/p&gt;</comment>
                            <comment id="358622" author="milkie" created="Wed, 12 Jun 2013 14:28:33 +0000"  >&lt;p&gt;For clarification, are you saying that we should do something to more strictly enforce the 5s timeout, because 30s timeouts are problematic?  Or are you saying we should change the socket timeout to 30s?&lt;br/&gt;
(I think you meant sock.cpp?)&lt;/p&gt;</comment>
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