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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-63193] Watchdog may return success reading from page cache</title>
                <link>https://jira.mongodb.org/browse/SERVER-63193</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The comment on checkFile states this is &#8220;open a direct_io&#8221; to a new file. However, the O_DIRECT flag is not added to the open call. This should mean this is a standard, buffered IO. &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/watchdog/watchdog.cpp#L467&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/watchdog/watchdog.cpp#L467&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;In an asymmetric storage failure where writes can complete, but reads are blocked, the read at &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/watchdog/watchdog.cpp#L522&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/watchdog/watchdog.cpp#L522&lt;/a&gt; could be serviced from the Linux page cache, erroneously returning a success.&lt;/p&gt;</description>
                <environment>Linux</environment>
        <key id="1975297">SERVER-63193</key>
            <summary>Watchdog may return success reading from page cache</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="gabriel.marks@mongodb.com">Gabriel Marks</assignee>
                                    <reporter username="kevin.arhelger@mongodb.com">Kevin Arhelger</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Feb 2022 19:15:48 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:16 +0000</updated>
                            <resolved>Thu, 4 Aug 2022 21:03:56 +0000</resolved>
                                    <version>5.2.0</version>
                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4703815" author="xgen-internal-githook" created="Mon, 25 Jul 2022 21:45:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gabriel Marks&apos;, &apos;email&apos;: &apos;gabriel.marks@mongodb.com&apos;, &apos;username&apos;: &apos;marksg07&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63193&quot; title=&quot;Watchdog may return success reading from page cache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63193&quot;&gt;&lt;del&gt;SERVER-63193&lt;/del&gt;&lt;/a&gt; Use O_DIRECT in checkFile for the watchdog&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 50d4bcf42c06c70d179c128247919e62d5bffa50.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1aa4307b5ecd61413468cb190935f3746ddcf6ef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1aa4307b5ecd61413468cb190935f3746ddcf6ef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4703160" author="xgen-internal-githook" created="Mon, 25 Jul 2022 18:51:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gabriel Marks&apos;, &apos;email&apos;: &apos;gabriel.marks@mongodb.com&apos;, &apos;username&apos;: &apos;marksg07&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63193&quot; title=&quot;Watchdog may return success reading from page cache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63193&quot;&gt;&lt;del&gt;SERVER-63193&lt;/del&gt;&lt;/a&gt; Use O_DIRECT in checkFile for the watchdog&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/50d4bcf42c06c70d179c128247919e62d5bffa50&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/50d4bcf42c06c70d179c128247919e62d5bffa50&lt;/a&gt;&lt;/p&gt;</comment>
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