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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-32593] CSRS stepdown during migration commit can trigger fassert on source shard primary</title>
                <link>https://jira.mongodb.org/browse/SERVER-32593</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During the critical section, the source shard sends &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9f36a4b903/src/mongo/db/s/migration_source_manager.cpp#L427-L433&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_configsvrCommitChunkMigration to the CSRS primary&lt;/a&gt;, but this can fail if the primary recently stepped down, causing the source shard to try to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9f36a4b903/src/mongo/db/s/migration_source_manager.cpp#L456-L464&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;log &quot;moveChunk.validating&quot; on the CSRS primary&lt;/a&gt; to update its optime before refreshing metadata, and if this also fails, the source shard will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9f36a4b903/src/mongo/db/s/migration_source_manager.cpp#L475-L483&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fassert&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;From &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9f36a4b903/src/mongo/db/s/migration_source_manager.h#L139-L141&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this comment&lt;/a&gt;, it seems that this is desired behavior, but it&apos;s a problem for the continuous stepdowns concurrency suite with the balancer enabled, since background migrations can crash servers and fail the test when the cluster is torn down.&lt;/p&gt;

&lt;p&gt;Example failure: &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_concurrency_sharded_with_stepdowns_and_balancer_WT_patch_b8f64cc3fde6d041f3e90b1cb2e153b0b15f6c47_5a20e4efe3c33173de00c68d_17_12_01_05_13_55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_rhel_62_64_bit_concurrency_sharded_with_stepdowns_and_balancer_WT_patch_b8f64cc3fde6d041f3e90b1cb2e153b0b15f6c47_5a20e4efe3c33173de00c68d_17_12_01_05_13_55&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="480355">SERVER-32593</key>
            <summary>CSRS stepdown during migration commit can trigger fassert on source shard primary</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 Jan 2018 23:18:39 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:30 +0000</updated>
                            <resolved>Tue, 30 Jan 2018 19:43:32 +0000</resolved>
                                                    <fixVersion>3.6.3</fixVersion>
                    <fixVersion>3.7.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1791397" author="xgen-internal-githook" created="Thu, 1 Feb 2018 02:08:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32593&quot; title=&quot;CSRS stepdown during migration commit can trigger fassert on source shard primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32593&quot;&gt;&lt;del&gt;SERVER-32593&lt;/del&gt;&lt;/a&gt; Stepdown after failed moveChunk commit shouldn&apos;t crash source shard primary&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 153610cb7439546ef8897a2f4eda05b7fb50af5c)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0f9d830a6228a82db66661f8869568e7db1105b7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0f9d830a6228a82db66661f8869568e7db1105b7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1789596" author="xgen-internal-githook" created="Tue, 30 Jan 2018 19:42:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32593&quot; title=&quot;CSRS stepdown during migration commit can trigger fassert on source shard primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32593&quot;&gt;&lt;del&gt;SERVER-32593&lt;/del&gt;&lt;/a&gt; Stepdown after failed moveChunk commit shouldn&apos;t crash source shard primary&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/153610cb7439546ef8897a2f4eda05b7fb50af5c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/153610cb7439546ef8897a2f4eda05b7fb50af5c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1768811" author="kaloian.manassiev" created="Tue, 9 Jan 2018 13:43:29 +0000"  >&lt;p&gt;It is already quasi-exception safe because the main state machine methods use a ScopedGuard to invoke the cleanup code. However, it is the cleanup code which is not exception-safe. So I think if we make that code not throw (by catching the exceptions), it should be sufficient.&lt;/p&gt;</comment>
                            <comment id="1768794" author="schwerin" created="Tue, 9 Jan 2018 13:32:26 +0000"  >&lt;p&gt;How hard would it be to make the source manager exception safe?&lt;/p&gt;</comment>
                            <comment id="1768775" author="kaloian.manassiev" created="Tue, 9 Jan 2018 13:08:39 +0000"  >&lt;p&gt;Looks like it is not safe for code to throw in any of the MigrationSourceManager&apos;s cleanup methods. I think it is safe to ignore the stepdown errors, because we won&apos;t clear the migration flag as well, but we just need to make it not crash in that situation.&lt;/p&gt;</comment>
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