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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-36727] Dump open transactions and currentOp info in hang analyzer</title>
                <link>https://jira.mongodb.org/browse/SERVER-36727</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a test hangs due to a transaction being leaked, we currently have no idea what transaction caused the problem.&lt;/p&gt;</description>
                <environment></environment>
        <key id="590038">SERVER-36727</key>
            <summary>Dump open transactions and currentOp info in hang analyzer</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>prepare_optional</label>
                            <label>prepare_testing</label>
                            <label>tig-hanganalyzer</label>
                    </labels>
                <created>Fri, 17 Aug 2018 16:06:46 +0000</created>
                <updated>Tue, 6 Dec 2022 03:20:32 +0000</updated>
                            <resolved>Fri, 17 May 2019 18:59:08 +0000</resolved>
                                                                    <component>Replication</component>
                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1982632" author="judah.schvimer" created="Wed, 22 Aug 2018 16:02:35 +0000"  >&lt;p&gt;I think lock acquisition is a fair concern. I think adding a timeout on the currentOp command or the currentOp command caller to kill the currentOp would sufficiently handle that while still getting valuable information when it is not blocked by a lock.&lt;/p&gt;</comment>
                            <comment id="1982049" author="max.hirschhorn@10gen.com" created="Wed, 22 Aug 2018 02:35:11 +0000"  >&lt;p&gt;My concern is around how successful we&apos;d be in a hang scenario with logging any open transactions or currentOp() output - do you think the server commands would block trying to acquire some mutex that&apos;ll never be released? If you don&apos;t foresee that being an issue, then the approach I&apos;d take is to have hang_analyzer.py (1) learn the port of the mongod process by inspecting its process arguments, (2) spawn a mongo shell process to run the desired server commands, and (3) wait up to a certain amount of time (e.g. 10 seconds) for the mongo shell process to exit. (We can send the mongo shell process a SIGKILL if it doesn&apos;t exit on its own.) I&apos;d say that we&apos;d be better served by running the desired server commands before attaching with a debugger as I wouldn&apos;t trust the process state after its been perturbed by calling C++ functions via gdb.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mark.benvenuto&quot; class=&quot;user-hover&quot; rel=&quot;mark.benvenuto&quot;&gt;mark.benvenuto&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1979012" author="judah.schvimer" created="Fri, 17 Aug 2018 17:18:17 +0000"  >&lt;p&gt;The idea was the former. Do you have an idea for an easier way to accomplish the same goal?&lt;/p&gt;</comment>
                            <comment id="1978943" author="max.hirschhorn@10gen.com" created="Fri, 17 Aug 2018 16:34:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt;, is the idea to do this by connecting to the mongod process with a socket and running some commands, or to call a function / walk some in-memory data structure? The existing gdb scripts are only prepared to do the latter.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="679589">SERVER-39245</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="631533">SERVER-38045</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="590036">SERVER-36726</issuekey>
        </issuelink>
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