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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>
    </build-info>


<item>
            <title>[SERVER-5152] Windows unhandled exception filter should report thread and fault address</title>
                <link>https://jira.mongodb.org/browse/SERVER-5152</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Windows version of mongod sets up an &quot;unhandled exception filter&quot; which is called when an exception occurs that is not trapped by any of our regular try/catch code.  The main reason it exists and the main way that it gets to execute is on &quot;access violations&quot;, the Windows term for a segfault.  Attempts to read from address 0 or 0 plus a structure offset will pass through this exception filter on their way to a quick exit.  All the code does is record the fact that it happened.&lt;/p&gt;

&lt;p&gt;But the existing code garbles its output (&quot;unhandled Windows ex&quot; is output followed by a timestamp and &quot;access violation&quot; with no newline so it looks really bad) and, worse, it doesn&apos;t tell us which thread had the access violation or what the faulting address was, so we have absolutely nothing to go on in debugging it.&lt;/p&gt;

&lt;p&gt;The code should instead display a readable output line, make sure that it goes to the log file so we get it when mongod.exe is running as a service, and it should tell us which thread faulted and what the faulting address was.  This would at least give us a starting point in finding out how a crash happened.&lt;/p&gt;

&lt;p&gt;I am posting this because of an access violation that happened in buildbot for the 32-bit Windows version that was not reproducible when tested on my machine and which passed the test on the next buildbot run.  So all we know is that the 32-bit Windows version can crash but nothing about how it can happen.&lt;/p&gt;</description>
                <environment>Windows</environment>
        <key id="31888">SERVER-5152</key>
            <summary>Windows unhandled exception filter should report thread and fault address</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="9">Done</resolution>
                                        <assignee username="tad">Tad Marshall</assignee>
                                    <reporter username="tad">Tad Marshall</reporter>
                        <labels>
                            <label>Windows</label>
                    </labels>
                <created>Thu, 1 Mar 2012 01:31:32 +0000</created>
                <updated>Mon, 11 Jul 2016 18:33:31 +0000</updated>
                            <resolved>Sun, 4 Mar 2012 18:55:46 +0000</resolved>
                                                    <fixVersion>2.1.1</fixVersion>
                                    <component>Internal Code</component>
                    <component>Logging</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="95092" author="auto" created="Sun, 4 Mar 2012 18:47:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;tadmarshall&apos;, u&apos;name&apos;: u&apos;Tad Marshall&apos;, u&apos;email&apos;: u&apos;tad@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5152&quot; title=&quot;Windows unhandled exception filter should report thread and fault address&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5152&quot;&gt;&lt;del&gt;SERVER-5152&lt;/del&gt;&lt;/a&gt; Improve unhandled exception code on Windows&lt;/p&gt;

&lt;p&gt;This change improves the reporting of unhandled exceptions in&lt;br/&gt;
mongod.exe in Windows, mainly access violations (segfaults).  Like&lt;br/&gt;
the old code, it doesn&apos;t try to keep running, but in release&lt;br/&gt;
builds this version does try to use dbexit() to exit instead of&lt;br/&gt;
letting Windows do it to us.  In debug builds, we pass the exception&lt;br/&gt;
on to Windows as before, which lets it offer the chance to run the&lt;br/&gt;
debugger.  Tested with a null pointer reference, we now get a clean&lt;br/&gt;
log with a thread name and the address where the exception happened.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ad7deaa8818c95f2c590232a8a73e71441413e21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ad7deaa8818c95f2c590232a8a73e71441413e21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="94926" author="tad" created="Sat, 3 Mar 2012 12:47:20 +0000"  >&lt;p&gt;I edited the description to remove my incorrect claim about catch ( ... ) and set the Fix Version to 2.1.1 since the code is written and moving through code review.  This will be very helpful for debugging access violations in the Windows version in the field.&lt;/p&gt;</comment>
                            <comment id="94021" author="tad" created="Thu, 1 Mar 2012 03:14:10 +0000"  >&lt;p&gt;Good question, and what I said may be wrong.  I have used __try { } __finally { } and noticed that C++ exceptions on Windows seem to use SEH, but I don&apos;t have actual practice trying to use SEH and C++ exceptions together so I am probably wrong.&lt;/p&gt;

&lt;p&gt;Update ... I tested it and I am wrong.&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;
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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;    void Listener::_logListen( int port , bool ssl ) {&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;        log() &amp;lt;&amp;lt; _name &amp;lt;&amp;lt; ( _name.size() ? &quot; &quot; : &quot;&quot; ) &amp;lt;&amp;lt; &quot;waiting for connections on port &quot; &amp;lt;&amp;lt; port &amp;lt;&amp;lt; ( ssl ? &quot; ssl&quot; : &quot;&quot; ) &amp;lt;&amp;lt; endl;&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;        static bool uncrashed = true;&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;        try {&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;            if ( uncrashed ) {&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;                uncrashed = false;&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;                *( static_cast&amp;lt; char * &amp;gt;( 0 ) ) = 0;&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;            }&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;        }&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;        catch ( ... ) {&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;            log() &amp;lt;&amp;lt; &quot;caught exception, continuing ...&quot;&amp;lt;&amp;lt; endl; // does not fire&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</comment>
                            <comment id="94013" author="schwerin" created="Thu, 1 Mar 2012 02:19:45 +0000"  >&lt;p&gt;Interesting, does (...) catch access violations if you don&apos;t have structured exception handling (SEH) enabled?&lt;/p&gt;</comment>
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