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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-5724] dbtemprelease&apos;s destructor can fail to restore state and assert on failure</title>
                <link>https://jira.mongodb.org/browse/SERVER-5724</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently dbtemprelease&apos;s destructor attempts to acquire the same lock type as was yielded and restore the thread&apos;s client context to its pre yield state.  If the lock is a read lock and the context&apos;s namespace belongs to a database that was closed during the yield, restoring the context will fail and dbtemprelease&apos;s destructor will assert.&lt;/p&gt;

&lt;p&gt;Asserting in dbtemprelease&apos;s destructor seems particularly unsafe because as a raii class its destructor is designed to be called when another exception is active.&lt;/p&gt;

&lt;p&gt;There seems to be a way to detect an active stack unwinding exception in a destructor, but it may be unreliable and there is no way to replace this exception with a higher priority exception about an inability to recover the thread&apos;s client context.&lt;/p&gt;

&lt;p&gt;Provisionally two options for dealing with this are:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Implement a dbtemprelease with a destructor that cannot fail to restore state.&lt;/li&gt;
	&lt;li&gt;If dbtemprelease can fail to restore state, it should not be implemented as an raii class but perhaps instead using exception forwarding, maybe something like:
&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;
		&lt;tbody &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;  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;	try {&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;		releaseState();&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;		doSomething();&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;		restoreState();&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;	} catch ( ... ) {&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;		restoreState(); // may throw&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;		throw;&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;   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;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5101&quot; title=&quot;Test failure in closeall.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5101&quot;&gt;&lt;del&gt;SERVER-5101&lt;/del&gt;&lt;/a&gt; for an example of the dbtemprelease destructor assertion.&lt;/p&gt;</description>
                <environment></environment>
        <key id="37472">SERVER-5724</key>
            <summary>dbtemprelease&apos;s destructor can fail to restore state and assert on failure</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="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Apr 2012 17:20:54 +0000</created>
                <updated>Mon, 11 Jul 2016 18:32:28 +0000</updated>
                            <resolved>Wed, 29 Oct 2014 20:46:39 +0000</resolved>
                                                    <fixVersion>2.5.5</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="491162" author="xgen-internal-githook" created="Thu, 30 Jan 2014 22:15:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5724&quot; title=&quot;dbtemprelease&amp;#39;s destructor can fail to restore state and assert on failure&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5724&quot;&gt;&lt;del&gt;SERVER-5724&lt;/del&gt;&lt;/a&gt; Mark dbtemprelase&lt;/p&gt;
{,cond,if}
&lt;p&gt; destructors as throwing&lt;/p&gt;

&lt;p&gt;This is a stop-gap solution to prevent c++11 builds from terminating when&lt;br/&gt;
relocking and reinitializing Client::Context fails. In c++11 destructors that&lt;br/&gt;
aren&apos;t explicitly marked as throwing are implicitly noexcept(true).&lt;/p&gt;

&lt;p&gt;For similar reasons it is invalid to put dbtemprelease into a smart pointer&lt;br/&gt;
since the smart pointer&apos;s destructor isn&apos;t marked as throwing. The few places&lt;br/&gt;
that did that were also changed.&lt;/p&gt;

&lt;p&gt;dbtemprelasewritelock is unused so it was removed rather than fixed.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e472493129c095170f1322a98af67bdf5208fe51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e472493129c095170f1322a98af67bdf5208fe51&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="121707" author="schwerin" created="Tue, 22 May 2012 00:02:41 +0000"  >&lt;p&gt;Further problem is appropriately invalidating parent contexts.  Blech.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="32378">SERVER-5229</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="65340">SERVER-8579</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="31594">SERVER-5101</issuekey>
        </issuelink>
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