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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-43703] Race when disabling rsSyncApplyStop failpoint and stopping server</title>
                <link>https://jira.mongodb.org/browse/SERVER-43703</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In periodic_kill_secondaries.py we call _kill_secondaries() at the start of each test. For each secondary, that function, disables the rsSyncStopApply failpoint, sleeps 100 ms, then kills the secondary.&lt;/p&gt;

&lt;p&gt;In sync_tail.cpp, in _oplogApplication, we have:&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;        if (MONGO_FAIL_POINT(rsSyncApplyStop)) {&lt;/span&gt;&lt;/pre&gt;
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				&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;            while (MONGO_FAIL_POINT(rsSyncApplyStop)) {&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;                // Tests should not trigger clean shutdown while that failpoint is active. If we&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;                // think we need this, we need to think hard about what the behavior should be.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;                if (inShutdown()) {&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;                    severe() &amp;lt;&amp;lt; &quot;Turn off rsSyncApplyStop before attempting clean shutdown&quot;;&lt;/span&gt;&lt;/pre&gt;
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					&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;                    fassertFailedNoTrace(40304);&lt;/span&gt;&lt;/pre&gt;
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					&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;                }&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;                sleepmillis(10);&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;   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;        }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;I think there&apos;s a clear race, if the oplog application thread happens to hang for longer than 100 ms between checking &lt;tt&gt;MONGO_FAIL_POINT(rsSyncApplyStop)&lt;/tt&gt; and checking &lt;tt&gt;inShutdown()&lt;/tt&gt;, then periodic_kill_secondaries.py can turn off the failpoint &lt;b&gt;and&lt;/b&gt; start shutting down mongod during that hang. By the time the thread calls &lt;tt&gt;inShutdown()&lt;/tt&gt;, its value is true and we fassert.&lt;/p&gt;

&lt;p&gt;As the comment says, we need to think hard about what the behavior should be. One idea is for periodic_kill_secondaries.py to wait to shut down mongod until the mongod code has definitely left the while loop; we could add a log message after the while loop which periodic_kill_secondaries.py could wait for.&lt;/p&gt;

&lt;p&gt;I prefer a different idea: Let&apos;s handle the case where rsSyncApplyStop is still enabled when mongod shuts down. As a side effect, this change will also fix the race condition if rsSyncApplyStop is disabled immediately before mongod shuts down. We can simply exit the while loop if &lt;tt&gt;inShutdown()&lt;/tt&gt; is true, and from there we proceed to the normal shutdown path.&lt;/p&gt;</description>
                <environment></environment>
        <key id="945233">SERVER-43703</key>
            <summary>Race when disabling rsSyncApplyStop failpoint and stopping server</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="13201">Fixed</resolution>
                                        <assignee username="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Sat, 28 Sep 2019 22:25:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:41 +0000</updated>
                            <resolved>Sat, 5 Oct 2019 03:10:46 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.2</fixVersion>
                    <fixVersion>4.0.14</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2513609" author="xgen-internal-githook" created="Fri, 1 Nov 2019 03:22:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43703&quot; title=&quot;Race when disabling rsSyncApplyStop failpoint and stopping server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43703&quot;&gt;&lt;del&gt;SERVER-43703&lt;/del&gt;&lt;/a&gt; On shutdown check rsSyncApplyStop is disabled&lt;/p&gt;

&lt;p&gt;The previous code had a race: if the test disables the rsSyncApplyStop&lt;br/&gt;
failpoint and immediately kills mongod, then mongod could fassert. Now&lt;br/&gt;
it fasserts only if the failpoint is still enabled on shutdown.&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9254992748ebe5dcf441591bf26a2ab5448220ba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9254992748ebe5dcf441591bf26a2ab5448220ba&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2497187" author="xgen-internal-githook" created="Wed, 23 Oct 2019 11:28:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43703&quot; title=&quot;Race when disabling rsSyncApplyStop failpoint and stopping server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43703&quot;&gt;&lt;del&gt;SERVER-43703&lt;/del&gt;&lt;/a&gt; On shutdown check rsSyncApplyStop is disabled&lt;/p&gt;

&lt;p&gt;The previous code had a race: if the test disables the rsSyncApplyStop&lt;br/&gt;
failpoint and immediately kills mongod, then mongod could fassert. Now&lt;br/&gt;
it fasserts only if the failpoint is still enabled on shutdown.&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/460f931088439551bc7a3af2366ac5a7397391e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/460f931088439551bc7a3af2366ac5a7397391e6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2467708" author="xgen-internal-githook" created="Sat, 5 Oct 2019 02:49:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43703&quot; title=&quot;Race when disabling rsSyncApplyStop failpoint and stopping server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43703&quot;&gt;&lt;del&gt;SERVER-43703&lt;/del&gt;&lt;/a&gt; On shutdown check rsSyncApplyStop is disabled&lt;/p&gt;

&lt;p&gt;The previous code had a race: if the test disables the rsSyncApplyStop&lt;br/&gt;
failpoint and immediately kills mongod, then mongod could fassert. Now&lt;br/&gt;
it fasserts only if the failpoint is still enabled on shutdown.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2664c92b226bf94bb9da85c58b8820771c79c434&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2664c92b226bf94bb9da85c58b8820771c79c434&lt;/a&gt;&lt;/p&gt;</comment>
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