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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-11002] Insufficient permission will crash checkReadAhead()</title>
                <link>https://jira.mongodb.org/browse/SERVER-11002</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/db.cpp#L614&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/db/db.cpp#L614&lt;/a&gt;&lt;br/&gt;
the function checkReadAhead() introduced by Core/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7335&quot; title=&quot;Warn at startup on machines with sub-optimal readahead settings&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7335&quot;&gt;&lt;del&gt;SERVER-7335&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7335&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-7335&lt;/a&gt;&lt;br/&gt;
uses boost::filesystem::exists() without checks for exceptions.&lt;/p&gt;

&lt;p&gt;An exception will be thrown if the path can&apos;t be accessed (due to insufficient access rights in my case). This will crash the startup.&lt;/p&gt;

&lt;p&gt;I gather that checking the readahead is informational only. It would be an improvement to just log the error and carry on.&lt;/p&gt;

&lt;p&gt;The attached patch will catch the filesystem exception and log a line of&lt;br/&gt;
Wed Oct  2 13:52:40.434 &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; boost::filesystem::status: Permission denied: &quot;/sys/dev/block/9:0/queue/read_ahead_kb&quot;&lt;/p&gt;

&lt;p&gt;See here for the changes:&lt;br/&gt;
&lt;a href=&quot;https://github.com/zuckschwerdt/mongo/commit/f0b286380b4647ebd7a1e084b84309f12bc8e087&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/zuckschwerdt/mongo/commit/f0b286380b4647ebd7a1e084b84309f12bc8e087&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;And here for the complete patch with indentation&lt;br/&gt;
&lt;a href=&quot;https://github.com/zuckschwerdt/mongo/commit/581f3abe6b1faa2a65168c3044eb1e8f737c07b8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/zuckschwerdt/mongo/commit/581f3abe6b1faa2a65168c3044eb1e8f737c07b8&lt;/a&gt;&lt;/p&gt;</description>
                <environment>Linux with Grsec / VM</environment>
        <key id="92399">SERVER-11002</key>
            <summary>Insufficient permission will crash checkReadAhead()</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="9">Done</resolution>
                                        <assignee username="matt.kangas">Matt Kangas</assignee>
                                    <reporter username="zany">Christian Zuckschwerdt</reporter>
                        <labels>
                            <label>pull-request</label>
                    </labels>
                <created>Wed, 2 Oct 2013 13:19:23 +0000</created>
                <updated>Mon, 11 Jul 2016 17:40:25 +0000</updated>
                            <resolved>Mon, 7 Oct 2013 17:58:42 +0000</resolved>
                                                    <fixVersion>2.5.3</fixVersion>
                                    <component>Logging</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="436690" author="matt.kangas@10gen.com" created="Mon, 7 Oct 2013 17:58:42 +0000"  >&lt;p&gt;Merged in &lt;a href=&quot;https://github.com/mongodb/mongo/commit/69079a7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;69079a7&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/commit/b766095&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;b766095&lt;/a&gt;. Thanks for contributing to MongoDB!&lt;/p&gt;</comment>
                            <comment id="435500" author="matt.kangas@10gen.com" created="Thu, 3 Oct 2013 22:33:09 +0000"  >&lt;p&gt;Hi Christian,&lt;/p&gt;

&lt;p&gt;Your patch looks good. If you sign our contributor&apos;s agreement and submit this as a pull request, I will be happy to give you full credit for the fix.&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;http://www.mongodb.com/legal/contributor-agreement&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.com/legal/contributor-agreement&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;Then submit a pull request from &lt;a href=&quot;https://github.com/zuckschwerdt/mongo/tree/fix-checkreadahead-fs-exception&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/zuckschwerdt/mongo/tree/fix-checkreadahead-fs-exception&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Please include &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11002&quot; title=&quot;Insufficient permission will crash checkReadAhead()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11002&quot;&gt;&lt;del&gt;SERVER-11002&lt;/del&gt;&lt;/a&gt;&quot; in the title of your pull request&lt;/p&gt;</comment>
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