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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-58332] pipeline MemoryUsageTracker: change StringMap to unordered_map for pointer stability</title>
                <link>https://jira.mongodb.org/browse/SERVER-58332</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This appears to be a previously undiagnosed error in the Agg pipeline &quot;explain&quot; implementation, which becomes visible when abseil is upgraded.&lt;/p&gt;

&lt;p&gt;This is blocking &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51476&quot; title=&quot;Upgrade Abseil to 20210324.1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51476&quot;&gt;&lt;del&gt;SERVER-51476&lt;/del&gt;&lt;/a&gt; (Abseil upgrade), as aggregation tests begin to fail with new absl version.&lt;br/&gt;
&lt;a href=&quot;https://spruce.mongodb.com/version/60e00def61837d5cfc0f4f9c/tasks&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://spruce.mongodb.com/version/60e00def61837d5cfc0f4f9c/tasks&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I can reproduce this locally on a Linux virtual workstation and attach a debugger, but I don&apos;t have a root cause for it. Still investigating.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;7  0x00007fba641ab8c2 in mongo::breakpoint () at src/mongo/util/debugger.cpp:72&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#8  0x00007fba6416481d in mongo::(anonymous namespace)::abruptQuitWithAddrSignal (signalNum=11, siginfo=0x7fba2f64d4f0, ucontext_erased=0x7fba2f64d3c0) at src/mongo/util/signal_handlers_synchronous.cpp:284&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#9  &amp;lt;signal handler called&amp;gt;&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#10 0x00007fba4f2435bc in mongo::MemoryUsageTracker::update (this=0xcdcdcdcdcdcdcdcd, diff=3617008641903833723) at src/mongo/db/pipeline/memory_usage_tracker.h:152&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#11 0x00007fba4f242e56 in mongo::MemoryUsageTracker::PerFunctionMemoryTracker::set (this=0x7fba3757c658, total=72) at src/mongo/db/pipeline/memory_usage_tracker.h:64&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#12 0x00007fba4f355ef4 in mongo::WindowFunctionExecNonRemovable::initialize (this=0x7fba3757c220) at src/mongo/db/pipeline/window_function/window_function_exec_non_removable.h:125&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#13 0x00007fba4f35515d in mongo::WindowFunctionExecNonRemovable::getNext (this=0x7fba3757c220) at src/mongo/db/pipeline/window_function/window_function_exec_non_removable.h:69&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#14 0x00007fba4f2eafad in mongo::DocumentSourceInternalSetWindowFields::doGetNext (this=0x7fba3753c8e0) at src/mongo/db/pipeline/document_source_set_window_fields.cpp:454&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#15 0x00007fba534edc0b in mongo::DocumentSource::getNext (this=0x7fba3753c8e0) at src/mongo/db/pipeline/document_source.h:305&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#16 0x00007fba4f334133 in mongo::Pipeline::getNext (this=0x7fba3022f3a0) at src/mongo/db/pipeline/pipeline.cpp:448&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#17 0x00007fba53e53f2c in mongo::PlanExecutorPipeline::_tryGetNext (this=0x7fba39010420) at src/mongo/db/pipeline/plan_executor_pipeline.cpp:128&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#18 0x00007fba53e53dc7 in mongo::PlanExecutorPipeline::_getNext (this=0x7fba39010420) at src/mongo/db/pipeline/plan_executor_pipeline.cpp:116&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#19 0x00007fba53e53cae in mongo::PlanExecutorPipeline::getNextDocument (this=0x7fba39010420, docOut=0x7fba22e34a88, recordIdOut=0x0) at src/mongo/db/pipeline/plan_executor_pipeline.cpp:98&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#20 0x00007fba53e53b49 in mongo::PlanExecutorPipeline::getNext (this=0x7fba39010420, objOut=0x7fba22e34ae0, recordIdOut=0x0) at src/mongo/db/pipeline/plan_executor_pipeline.cpp:78&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#21 0x00007fba53e6a2cc in mongo::(anonymous namespace)::executePlan (exec=0x7fba39010420) at src/mongo/db/query/explain.cpp:263&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#22 0x00007fba53e6a796 in mongo::Explain::explainPipeline (exec=0x7fba39010420, executePipeline=true, verbosity=mongo::explain::VerbosityEnum::kExecStats, command=..., out=0x7fba22e34d70) at src/mongo/db/query/explain.cpp:318&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#23 0x00007fba4321fc7d in mongo::runAggregate (opCtx=0x7fba2ed48220, origNss=..., request=..., liteParsedPipeline=..., cmdObj=..., privileges=..., result=0x7fba3757bb20) at src/mongo/db/commands/run_aggregate.cpp:896&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#24 0x00007fba432124ef in mongo::(anonymous namespace)::PipelineCommand::Invocation::explain (this=0x7fba2ee4c520, opCtx=0x7fba2ed48220, verbosity=mongo::explain::VerbosityEnum::kExecStats, result=0x7fba3757bb20) at src/mongo/db/commands/pipeline_command.cpp:167&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#25 0x00007fba431ae43c in mongo::(anonymous namespace)::CmdExplain::Invocation::run (this=0x7fba2f44ed60, opCtx=0x7fba2ed48220, result=0x7fba3757bb20) at src/mongo/db/commands/explain_cmd.cpp:113&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#26 0x00007fba4d841d10 in mongo::CommandHelpers::runCommandInvocation (opCtx=0x7fba2ed48220, request=..., invocation=0x7fba2f44ed60, response=0x7fba3757bb20) at src/mongo/db/commands.cpp:200&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#27 0x00007fba4d841a6a in mongo::CommandHelpers::&amp;lt;lambda()&amp;gt;::operator()(void) const (__closure=0x7fba22e35710) at src/mongo/db/commands.cpp:184&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1810881">SERVER-58332</key>
            <summary>pipeline MemoryUsageTracker: change StringMap to unordered_map for pointer stability</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="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Jul 2021 15:02:59 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:14 +0000</updated>
                            <resolved>Thu, 8 Jul 2021 18:36:53 +0000</resolved>
                                                    <fixVersion>5.0.2</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4106985" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:14:26 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3965182" author="xgen-internal-githook" created="Tue, 27 Jul 2021 13:54:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58332&quot; title=&quot;pipeline MemoryUsageTracker: change StringMap to unordered_map for pointer stability&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58332&quot;&gt;&lt;del&gt;SERVER-58332&lt;/del&gt;&lt;/a&gt; memory_usage_tracker: switch to node_hash_map for stable pointers&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 11b4bd0749384cc3097bce7bf75d3e39768a2a1f)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/154008633e31b5d947f97e97f72a397b4221e16b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/154008633e31b5d947f97e97f72a397b4221e16b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3923796" author="billy.donahue" created="Thu, 8 Jul 2021 18:34:16 +0000"  >&lt;p&gt;This was accidentally committed with the wrong ticket number &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58322&quot; title=&quot;Perform aggregate on buckets collection for time-series deletes on measurements&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58322&quot;&gt;&lt;del&gt;SERVER-58322&lt;/del&gt;&lt;/a&gt; in the description,&lt;br/&gt;
but actually fixes this bug.&lt;/p&gt;

&lt;p&gt;Author:&lt;/p&gt;

{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;billy.donahue@mongodb.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58322&quot; title=&quot;Perform aggregate on buckets collection for time-series deletes on measurements&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58322&quot;&gt;&lt;del&gt;SERVER-58322&lt;/del&gt;&lt;/a&gt; memory_usage_tracker: switch to node_hash_map for stable pointers&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/11b4bd0749384cc3097bce7bf75d3e39768a2a1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/11b4bd0749384cc3097bce7bf75d3e39768a2a1f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3922102" author="billy.donahue" created="Thu, 8 Jul 2021 01:46:57 +0000"  >&lt;p&gt;Figured it out. A StringMap is a typedef for absl::flat_hash_map for some reason, instead of absl::node_hash_map.&lt;br/&gt;
This means that elements do not have stable addresses, and references to elements are invalidated.&lt;/p&gt;

&lt;p&gt;The pipeline MemoryUsageTracker::operator[] was therefore handing out unstable references to PerFunctionMemoryTracker elements.&lt;/p&gt;</comment>
                            <comment id="3922099" author="billy.donahue" created="Thu, 8 Jul 2021 01:42:51 +0000"  >&lt;p&gt;&lt;br/&gt;
code review &lt;a href=&quot;https://mongodbcr.appspot.com/812250003/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/812250003/&lt;/a&gt;&lt;/p&gt;</comment>
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