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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-21078] Segfault from race between getlasterror with fsync:true and clean database shutdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-21078</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There appears to be a race between shutting down a mongod instance and running getlasterror with fsync:true when the storage engine is wired tiger and journaling is &lt;b&gt;disabled&lt;/b&gt;. When the race goes poorly, mongod segfaults.&lt;/p&gt;

&lt;p&gt;The stack trace via addr2line -i is as follows, with a build of mongod at commit &lt;a href=&quot;https://github.com/mongodb/mongo/tree/737bb20fcb9176eb5f664bd874cdaece779d4012&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;737bb20fcb9176eb5f664bd874cdaece779d4012&lt;/a&gt;.&lt;/p&gt;

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&lt;p/&gt;</description>
                <environment></environment>
        <key id="235761">SERVER-21078</key>
            <summary>Segfault from race between getlasterror with fsync:true and clean database shutdown</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Oct 2015 19:16:23 +0000</created>
                <updated>Wed, 25 Nov 2015 00:27:04 +0000</updated>
                            <resolved>Fri, 20 Nov 2015 23:10:58 +0000</resolved>
                                    <version>3.2.0-rc0</version>
                                    <fixVersion>3.2.0-rc4</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1094821" author="xgen-internal-githook" created="Fri, 20 Nov 2015 22:44:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21078&quot; title=&quot;Segfault from race between getlasterror with fsync:true and clean database shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21078&quot;&gt;&lt;del&gt;SERVER-21078&lt;/del&gt;&lt;/a&gt;: Avoid unsafe sessionCache usage in waitUntilDurable&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3504bc8ef46733ae79863e8d34765735a67fcb44&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3504bc8ef46733ae79863e8d34765735a67fcb44&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1094578" author="xgen-internal-githook" created="Fri, 20 Nov 2015 19:10:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21078&quot; title=&quot;Segfault from race between getlasterror with fsync:true and clean database shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21078&quot;&gt;&lt;del&gt;SERVER-21078&lt;/del&gt;&lt;/a&gt; - Fix race conditions by using the session cache more within the wtkv engine code&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 1944e28410ee687c7314e848d96582d5a9d54ff6.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2b49fe116b8d8012220fbbe0419fd2f57265054&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2b49fe116b8d8012220fbbe0419fd2f57265054&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1092599" author="xgen-internal-githook" created="Thu, 19 Nov 2015 03:34:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;David Hows&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21078&quot; title=&quot;Segfault from race between getlasterror with fsync:true and clean database shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21078&quot;&gt;&lt;del&gt;SERVER-21078&lt;/del&gt;&lt;/a&gt; - Fix race conditions by using the session cache more within the wtkv engine code&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1944e28410ee687c7314e848d96582d5a9d54ff6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1944e28410ee687c7314e848d96582d5a9d54ff6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1088906" author="david.hows" created="Mon, 16 Nov 2015 04:55:33 +0000"  >&lt;p&gt;Just rebased this patch against the tip of master and kicked off.&lt;/p&gt;

&lt;p&gt;Will follow up with the results.&lt;/p&gt;</comment>
                            <comment id="1088887" author="michael.cahill" created="Mon, 16 Nov 2015 03:52:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daveh86&quot; class=&quot;user-hover&quot; rel=&quot;daveh86&quot;&gt;daveh86&lt;/a&gt;, I see the CR here &lt;a href=&quot;https://mongodbcr.appspot.com/28910002&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/28910002&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Is there a patch build for the current version of the change?&lt;/p&gt;</comment>
                            <comment id="1070171" author="david.hows" created="Mon, 26 Oct 2015 06:48:36 +0000"  >&lt;p&gt;Been looking into this, looks like the segfault is caused by the WTKV Engine using a session that is not taken from its internal cache. This means  that when shutting down the server we can close the underlying WT connection while this session is still active and trying to write a checkpoint.&lt;/p&gt;

&lt;p&gt;I&apos;m doing some short testing on an initial fix and there may been need to remediate further things within the WTKV Engine code as I can see at least 3 other places that use sessions not taken from the Engines internal cache.&lt;/p&gt;</comment>
                            <comment id="1068311" author="schwerin" created="Thu, 22 Oct 2015 20:17:17 +0000"  >&lt;p&gt;I have yet to repro this failure with journaling enabled. I&apos;ve run the attached script through 170 iterations with no failures.&lt;/p&gt;</comment>
                            <comment id="1068228" author="schwerin" created="Thu, 22 Oct 2015 19:19:43 +0000"  >&lt;p&gt;Noticed this in the logs attached to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20856&quot; title=&quot;During CSRS upgrade, config server gets stuck in STARTUP2 when restarted with --replSet and --configsvrMode=sccc set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20856&quot;&gt;&lt;del&gt;SERVER-20856&lt;/del&gt;&lt;/a&gt;, though it&apos;s probably not the cause of that bug.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="240376">SERVER-21582</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="233820">SERVER-20856</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="95218" name="fsyncwt.sh" size="858" author="schwerin@mongodb.com" created="Thu, 22 Oct 2015 19:17:44 +0000"/>
                    </attachments>
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                            <customfieldvalue>&lt;p&gt;Run attached bash shell script, fsyncwt.sh, from a directory that contains &quot;mongo&quot; and &quot;mongod&quot; binaries.&lt;/p&gt;

&lt;p&gt;It does the following:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;launches mongod&lt;/li&gt;
	&lt;li&gt;starts a background job that runs getlasterror with fsync:true in a loop&lt;/li&gt;
	&lt;li&gt;shuts down the mongod using the shutdown command&lt;/li&gt;
	&lt;li&gt;expects mongod to exit with code 0&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The actual behavior is that eventually (rarely in more than 5 runs for me) the mongod segfaults.&lt;/p&gt;</customfieldvalue>

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