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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-43775] BSON errors should log memory context</title>
                <link>https://jira.mongodb.org/browse/SERVER-43775</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a corrupt BSON document is encountered, the error messages generated are usually unhelpful. These messages are particularly unhelpful because an error parsing or constructing a BSON object often results in the destruction of the object before the exception is caught, nullifying any attempts to examine the memory in a core dump. &lt;/p&gt;

&lt;p&gt;For example, if a BSONElement has an invalid type an error message like the following is printed:&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;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-top: 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;Assertion: Location10320: BSONElement: bad type 119 src/mongo/bson/bsonelement.cpp 599&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;This is also unhelpful because the file and line number reported will always be the same for this error, regardless of the location in the code.&lt;/p&gt;

&lt;p&gt;We should consider dumping the following information in the face of these types of errors:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Print the starting address and raw memory of the corrupt BSON object&lt;/li&gt;
	&lt;li&gt;Print a stack trace to locate the code that encountered the error&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="956942">SERVER-43775</key>
            <summary>BSON errors should log memory context</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Oct 2019 22:16:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:32 +0000</updated>
                            <resolved>Tue, 22 Oct 2019 19:20:25 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                                        <votes>1</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="2495964" author="xgen-internal-githook" created="Tue, 22 Oct 2019 19:11:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;username&apos;: &apos;louiswilliams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43775&quot; title=&quot;BSON errors should log memory context&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43775&quot;&gt;&lt;del&gt;SERVER-43775&lt;/del&gt;&lt;/a&gt; BSON errors should log memory context&lt;/p&gt;

&lt;p&gt;When an invalid type is detected in a BSONElement, print the address and&lt;br/&gt;
surrounding memory in an attempt to provide context around the error.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/565a92344456412acffa67879f962247291bee03&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/565a92344456412acffa67879f962247291bee03&lt;/a&gt;&lt;/p&gt;</comment>
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