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    <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-71649] Transaction API shouldn&apos;t block on an uncancelable operation</title>
                <link>https://jira.mongodb.org/browse/SERVER-71649</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After callers of the synchronous internal transaction API are interrupted, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eaafcf8243e/src/mongo/db/transaction/transaction_api.cpp#L107-L112&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the cancellation token of the transaction is canceled and the caller waits for the transaction to complete uninterruptibly&lt;/a&gt; to guarantee the callback provided to the API has completed and its referenced variables are still in scope. This relies on the assumption that cancelling the token for the transaction will soon complete the transaction.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70247&quot; title=&quot;SyncTransactionWithRetries used with SEPTransactionClient can leave transactions open when runNoThrow opCtx gets cancelled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70247&quot;&gt;&lt;del&gt;SERVER-70247&lt;/del&gt;&lt;/a&gt; fixed an issue where cancelling the transaction API will prevent the API from best effort aborting its transaction, leading to wasted resources. The fix made the best effort abort always use an uncancelable cancellation token. The API still forces callers to wait for the best effort abort to complete before returning though, so if the abort hangs, the caller will hang as well.&lt;/p&gt;

&lt;p&gt;This can trigger a deadlock if the caller of the API holds a resource like a SessionCatalog session for a different session than the transaction uses (e.g. if the caller uses the transaction API from an AlternativeClientRegion) that can prevent a stepdown from completing which may block the abort command &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eaafcf8243e/src/mongo/db/service_entry_point_common.cpp#L1611-L1614&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when it tries to take the RSTL&lt;/a&gt; before running.&lt;/p&gt;

&lt;p&gt;A possible fix is to refactor the API so it does not block the caller waiting for the best effort abort.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2196432">SERVER-71649</key>
            <summary>Transaction API shouldn&apos;t block on an uncancelable operation</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, 28 Nov 2022 16:59:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:30:01 +0000</updated>
                            <resolved>Mon, 12 Dec 2022 18:41:49 +0000</resolved>
                                    <version>6.2.0-rc1</version>
                    <version>6.3.0-rc0</version>
                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5048562" author="xgen-internal-githook" created="Mon, 12 Dec 2022 18:31:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jack Mulrow&apos;, &apos;email&apos;: &apos;jack.mulrow@mongodb.com&apos;, &apos;username&apos;: &apos;jsmulrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71649&quot; title=&quot;Transaction API shouldn&amp;#39;t block on an uncancelable operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71649&quot;&gt;&lt;del&gt;SERVER-71649&lt;/del&gt;&lt;/a&gt; Refactor Transaction API to not wait for an uncancelable abort&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/06b2332b5eedc7c733c4376a34df34d4018b253c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/06b2332b5eedc7c733c4376a34df34d4018b253c&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2152748">SERVER-70247</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2216313">SERVER-72287</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2220726">SERVER-72413</issuekey>
        </issuelink>
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