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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-42987] If an abortTransaction command gets interrupted we may dereference a null pointer inside abortActiveUnpreparedOrStashPreparedTransaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-42987</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When we run a command via &apos;invokeWithSessionCheckedOut&apos; we register an exit guard &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a623921d9cac3305dc40927b712969aafed4c5f9/src/mongo/db/service_entry_point_common.cpp#L445-L447&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; which will fire if the command throws an uncaught exception. If we are running an &apos;abortTransaction&apos; command on a session that currently has a prepared transaction, it is possible that the command gets interrupted. For example, if a concurrent killOp command has killed the operation. There is at least one interruption point within the &apos;abortTransaction&apos; command where we try to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/77967c90b1a521108c052af235ce7de9742aa95e/src/mongo/db/op_observer_impl.cpp#L1116&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;log an abort oplog entry&lt;/a&gt; and then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a623921d9cac3305dc40927b712969aafed4c5f9/src/mongo/db/transaction_participant.cpp#L2028&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;update the session entry&lt;/a&gt;. We try to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a623921d9cac3305dc40927b712969aafed4c5f9/src/mongo/db/transaction_participant.cpp#L192&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquire a lock there&lt;/a&gt; via AutoGetCollection. If the abort command throws after we have already &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a623921d9cac3305dc40927b712969aafed4c5f9/src/mongo/db/transaction_participant.cpp#L1509&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cleaned up&lt;/a&gt; the OperationContext resources, then the WriteUnitOfWork on the opCtx will have been &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a623921d9cac3305dc40927b712969aafed4c5f9/src/mongo/db/transaction_participant.cpp#L1587&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;set to null&lt;/a&gt;. So, if we then try to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a623921d9cac3305dc40927b712969aafed4c5f9/src/mongo/db/transaction_participant.cpp#L837&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;stash our transaction&lt;/a&gt; resources inside &apos;TransactionParticipant::Participant::_stashActiveTransaction&apos; when the exit guard fires, we may &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a623921d9cac3305dc40927b712969aafed4c5f9/src/mongo/db/transaction_participant.cpp#L668&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dereference&lt;/a&gt; the null WUOW.&lt;/p&gt;</description>
                <environment></environment>
        <key id="904378">SERVER-42987</key>
            <summary>If an abortTransaction command gets interrupted we may dereference a null pointer inside abortActiveUnpreparedOrStashPreparedTransaction</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="13201">Fixed</resolution>
                                        <assignee username="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Aug 2019 22:53:29 +0000</created>
                <updated>Sun, 29 Oct 2023 22:17:45 +0000</updated>
                            <resolved>Wed, 11 Sep 2019 21:04:25 +0000</resolved>
                                    <version>4.2.0</version>
                    <version>4.3.1</version>
                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2478390" author="xgen-internal-githook" created="Fri, 11 Oct 2019 18:22:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;username&apos;: &apos;judahschvimer&apos;, &apos;email&apos;: &apos;judah.schvimer@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42987&quot; title=&quot;If an abortTransaction command gets interrupted we may dereference a null pointer inside abortActiveUnpreparedOrStashPreparedTransaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42987&quot;&gt;&lt;del&gt;SERVER-42987&lt;/del&gt;&lt;/a&gt; make it safe to interrupt abortTransaction&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1659ddcfb49050dcf18fef014cd9d5ebf5717650)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/958d004f06c37b404c7164a49cf5c4784bea6c6f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/958d004f06c37b404c7164a49cf5c4784bea6c6f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2417130" author="xgen-internal-githook" created="Wed, 11 Sep 2019 20:43:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;judahschvimer&apos;, &apos;email&apos;: &apos;judah.schvimer@10gen.com&apos;, &apos;name&apos;: &apos;Judah Schvimer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42987&quot; title=&quot;If an abortTransaction command gets interrupted we may dereference a null pointer inside abortActiveUnpreparedOrStashPreparedTransaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42987&quot;&gt;&lt;del&gt;SERVER-42987&lt;/del&gt;&lt;/a&gt; make it safe to interrupt abortTransaction&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1659ddcfb49050dcf18fef014cd9d5ebf5717650&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1659ddcfb49050dcf18fef014cd9d5ebf5717650&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2384688" author="william.schultz" created="Fri, 23 Aug 2019 17:29:00 +0000"  >&lt;p&gt;I believe commitPreparedTransaction is immune to this issue because we log the oplog entry inside an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f661267bf981e3b315d7e942057ab0ac9dc90bef/src/mongo/db/transaction_participant.cpp#L1344&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;uninterruptible block&lt;/a&gt;.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="818527">SERVER-41956</issuekey>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="635430">SERVER-38190</issuekey>
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            <issuelink>
            <issuekey id="639686">SERVER-38299</issuekey>
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                <attachments>
                            <attachment id="228194" name="kill-prepared-commit-filtered.dump" size="22683509" author="william.schultz@mongodb.com" created="Fri, 23 Aug 2019 06:30:40 +0000"/>
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