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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-27701] Race in AsyncResultsMerger error handling may trigger mongos invariant</title>
                <link>https://jira.mongodb.org/browse/SERVER-27701</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We were running a stress test on a distributed sharded cluster (8 shards, 7 replicas, on 5 AWS regions), checking behaviour when killing different parts of the cluster.&lt;/p&gt;

&lt;p&gt;We setup 5 application servers (1 per region) with mongos on the same server.&lt;/p&gt;

&lt;p&gt;One of the mongos from where we were running the tests crashed after we killed some processes (including some config servers).&lt;/p&gt;

&lt;p&gt;The message when crashing was :&lt;br/&gt;
Invariant failure remote.status.isOK() src/mongo/s/query/async_results_merger.cpp 345&lt;/p&gt;

&lt;p&gt; Attached is the mongos log.&lt;/p&gt;

&lt;p&gt;Tests started at 15:47 after sharding the collection &quot;renault&quot;&lt;/p&gt;</description>
                <environment></environment>
        <key id="346248">SERVER-27701</key>
            <summary>Race in AsyncResultsMerger error handling may trigger mongos invariant</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="remi.forest">Remi Forest</reporter>
                        <labels>
                            <label>bkp</label>
                    </labels>
                <created>Tue, 17 Jan 2017 14:53:13 +0000</created>
                <updated>Thu, 7 Sep 2017 05:03:41 +0000</updated>
                            <resolved>Mon, 6 Feb 2017 22:53:42 +0000</resolved>
                                    <version>3.4.1</version>
                                    <fixVersion>3.2.14</fixVersion>
                    <fixVersion>3.4.4</fixVersion>
                    <fixVersion>3.5.3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1581249" author="xgen-internal-githook" created="Fri, 26 May 2017 20:20:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27701&quot; title=&quot;Race in AsyncResultsMerger error handling may trigger mongos invariant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27701&quot;&gt;&lt;del&gt;SERVER-27701&lt;/del&gt;&lt;/a&gt; fix race in AsyncResultsMerger error handling&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 5a35a6c425b815ecf7795d8e2706b9f3e82c7ce6)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/40d309be939eea757c09d4895b22c24905aa8b05&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/40d309be939eea757c09d4895b22c24905aa8b05&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1538013" author="xgen-internal-githook" created="Fri, 31 Mar 2017 15:47:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27701&quot; title=&quot;Race in AsyncResultsMerger error handling may trigger mongos invariant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27701&quot;&gt;&lt;del&gt;SERVER-27701&lt;/del&gt;&lt;/a&gt; fix race in AsyncResultsMerger error handling&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 5a35a6c425b815ecf7795d8e2706b9f3e82c7ce6)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0b0943d8cecba04d7e177c818a6429ff852650cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0b0943d8cecba04d7e177c818a6429ff852650cf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1493431" author="xgen-internal-githook" created="Mon, 6 Feb 2017 22:52:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27701&quot; title=&quot;Race in AsyncResultsMerger error handling may trigger mongos invariant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27701&quot;&gt;&lt;del&gt;SERVER-27701&lt;/del&gt;&lt;/a&gt; fix race in AsyncResultsMerger error handling&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5a35a6c425b815ecf7795d8e2706b9f3e82c7ce6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5a35a6c425b815ecf7795d8e2706b9f3e82c7ce6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1492021" author="david.storch" created="Fri, 3 Feb 2017 20:41:45 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=remi.forest&quot; class=&quot;user-hover&quot; rel=&quot;remi.forest&quot;&gt;remi.forest&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this issue. I&apos;ve tracked down the root cause. It&apos;s a race condition in the &lt;tt&gt;AsyncResultsMerger&lt;/tt&gt;, the component that the mongos read path uses to merge the streams of results from the shards into a single stream to return to the client driver. The &lt;tt&gt;AsyncResultsMerger&lt;/tt&gt; is used by the mongos query path&apos;s merge stage, &lt;tt&gt;RouterStageMerge&lt;/tt&gt;:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.1/src/mongo/s/query/router_stage_merge.cpp#L43-L56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.4.1/src/mongo/s/query/router_stage_merge.cpp#L43-L56&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;When &lt;tt&gt;RouterStageMerge&lt;/tt&gt; is asked to retrieve another query result, it delegates to the &lt;tt&gt;AsyncResultsMerger&lt;/tt&gt;, first calling &lt;tt&gt;ARM::ready()&lt;/tt&gt;. This method call asks whether either there is either an error or a result document available to return to the client. If neither an error nor a document is available, it calls &lt;tt&gt;ARM::nextEvent()&lt;/tt&gt;, which will schedule commands to run against the shards in order to retrieve more results. However, these two function calls happen in two steps, and each will separately acquire and release the &lt;tt&gt;AsyncResultsMerger&lt;/tt&gt;&apos;s mutex. This means that an error response from the shards can be processed after &lt;tt&gt;ARM::ready()&lt;/tt&gt; but before &lt;tt&gt;ARM::nextEvent()&lt;/tt&gt;! The failed invariant incorrectly assumes that it is impossible to have an outstanding error in &lt;tt&gt;ARM::nextEvent()&lt;/tt&gt;, since the caller is expected to have checked for an error using &lt;tt&gt;ARM::ready()&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I was able to reproduce the invariant by applying the following patch to mongos:&lt;/p&gt;
&lt;p/&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; //&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; // AsyncResultsMerger::MergingComparator&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;@@ -177,6 +177,8 @@ public:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;      */&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;     executor::TaskExecutor::EventHandle kill();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;+    void injectStatusForShards(Status status);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;+&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; private:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;     /**&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;      * We instantiate one of these per remote host. It contains the buffer of results we&apos;ve&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;diff --git a/src/mongo/s/query/router_stage_merge.cpp b/src/mongo/s/query/router_stage_merge.cpp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;index e3b8fd2..764cb19 100644&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;--- a/src/mongo/s/query/router_stage_merge.cpp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;+++ b/src/mongo/s/query/router_stage_merge.cpp&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;@@ -42,6 +42,7 @@ RouterStageMerge::RouterStageMerge(executor::TaskExecutor* executor,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; StatusWith&amp;lt;ClusterQueryResult&amp;gt; RouterStageMerge::next() {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;     while (!_arm.ready()) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;+        _arm.injectStatusForShards({ErrorCodes::OperationFailed, &quot;mock failure&quot;});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;         auto nextEventStatus = _arm.nextEvent();&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;         if (!nextEventStatus.isOK()) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   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;             return nextEventStatus.getStatus();&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This patch mocks the problem scenario by injecting an error into the &lt;tt&gt;ARM&lt;/tt&gt; in between the calls to &lt;tt&gt;ARM::next()&lt;/tt&gt; and &lt;tt&gt;ARM::ready()&lt;/tt&gt;. It reliably triggers the invariant when I run a find with no options against a sharded collection. This seems pretty unlikely to happen in practice under normal operation, but it is definitely something which our team will work on fixing.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Dave&lt;/p&gt;</comment>
                            <comment id="1478008" author="remi.forest" created="Tue, 17 Jan 2017 15:40:41 +0000"  >&lt;p&gt;Yes, but the same type of error happened at 16:27 and 15:59 but without crash (though on different TaskExecutorPool)&lt;/p&gt;</comment>
                            <comment id="1477964" author="dan@10gen.com" created="Tue, 17 Jan 2017 15:07:02 +0000"  >&lt;p&gt;Looks like there were some connectivity problems before the assertion failure.&lt;/p&gt;


&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  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;2017-01-10T16:27:39.416+0000 I ASIO     [NetworkInterfaceASIO-TaskExecutorPool-3-0] Connecting to ip-172-31-7-13.eu-west-2.compute.internal:28004&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;2017-01-10T16:27:39.428+0000 I ASIO     [NetworkInterfaceASIO-TaskExecutorPool-3-0] Failed to connect to ip-172-31-7-13.eu-west-2.compute.internal:28004 - HostUnreachable: Connection refused&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;2017-01-10T16:27:39.428+0000 I NETWORK  [NetworkInterfaceASIO-TaskExecutorPool-3-0] Marking host ip-172-31-7-13.eu-west-2.compute.internal:28004 as failed :: caused by :: HostUnreachable: Connection refused&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;2017-01-10T16:27:39.428+0000 I -        [conn3582] Invariant failure remote.status.isOK() src/mongo/s/query/async_results_merger.cpp 345&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;2017-01-10T16:27:39.428+0000 I -        [conn3582] &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;***aborting after invariant() failure&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;2017-01-10T16:27:39.437+0000 F -        [conn3582] Got signal: 6 (Aborted).&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; 0x55bdac6cd681 0x55bdac6cc779 0x55bdac6ccc5d 0x7f04c4cc5100 0x7f04c49295f7 0x7f04c492ace8 0x55bdabf0929c 0x55bdac5a8818 0x55bdac5bc433 0x55bdac5bbf11 0x55bdac5b016e 0x55bdac5b8c41 0x55bdac5ba880 0x55bdac52d0a0 0x55bdac5d34df 0x55bdac58be34 0x55bdac58d420 0x55bdac586759 0x55bdabf4d77d 0x55bdac63ccd2 0x7f04c4cbddc5 0x7f04c49eac9d&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;----- BEGIN BACKTRACE -----&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;{&quot;backtrace&quot;:[{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;BA4681&quot;,&quot;s&quot;:&quot;_ZN5mongo15printStackTraceERSo&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;BA3779&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;BA3C5D&quot;},{&quot;b&quot;:&quot;7F04C4CB6000&quot;,&quot;o&quot;:&quot;F100&quot;},{&quot;b&quot;:&quot;7F04C48F4000&quot;,&quot;o&quot;:&quot;355F7&quot;,&quot;s&quot;:&quot;gsignal&quot;},{&quot;b&quot;:&quot;7F04C48F4000&quot;,&quot;o&quot;:&quot;36CE8&quot;,&quot;s&quot;:&quot;abort&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;3E029C&quot;,&quot;s&quot;:&quot;_ZN5mongo17invariantOKFailedEPKcRKNS_6StatusES1_j&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A7F818&quot;,&quot;s&quot;:&quot;_ZN5mongo18AsyncResultsMerger9nextEventEv&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A93433&quot;,&quot;s&quot;:&quot;_ZN5mongo16RouterStageMerge4nextEv&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A92F11&quot;,&quot;s&quot;:&quot;_ZN5mongo16RouterStageLimit4nextEv&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A8716E&quot;,&quot;s&quot;:&quot;_ZN5mongo23ClusterClientCursorImpl4nextEv&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A8FC41&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A91880&quot;,&quot;s&quot;:&quot;_ZN5mongo11ClusterFind8runQueryEPNS_16OperationContextERKNS_14CanonicalQueryERKNS_21ReadPreferenceSettingEPSt6vectorINS_7BSONObjESaISA_EEPSA_&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A040A0&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;AAA4DF&quot;,&quot;s&quot;:&quot;_ZN5mongo7Command17execCommandClientEPNS_16OperationContextEPS0_iPKcRNS_7BSONObjERNS_14BSONObjBuilderE&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A62E34&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A64420&quot;,&quot;s&quot;:&quot;_ZN5mongo8Strategy15clientCommandOpEPNS_16OperationContextERNS_7RequestE&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;A5D759&quot;,&quot;s&quot;:&quot;_ZN5mongo7Request7processEPNS_16OperationContextEi&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;42477D&quot;,&quot;s&quot;:&quot;_ZN5mongo23ServiceEntryPointMongos12_sessionLoopERKSt10shared_ptrINS_9transport7SessionEE&quot;},{&quot;b&quot;:&quot;55BDABB29000&quot;,&quot;o&quot;:&quot;B13CD2&quot;},{&quot;b&quot;:&quot;7F04C4CB6000&quot;,&quot;o&quot;:&quot;7DC5&quot;},{&quot;b&quot;:&quot;7F04C48F4000&quot;,&quot;o&quot;:&quot;F6C9D&quot;,&quot;s&quot;:&quot;clone&quot;}],&quot;processInfo&quot;:{ &quot;mongodbVersion&quot; : &quot;3.4.1&quot;, &quot;gitVersion&quot; : &quot;5e103c4f5583e2566a45d740225dc250baacfbd7&quot;, &quot;compiledModules&quot; : [], &quot;uname&quot; : { &quot;sysname&quot; : &quot;Linux&quot;, &quot;release&quot; : &quot;4.4.35-33.55.amzn1.x86_64&quot;, &quot;version&quot; : &quot;#1 SMP Tue Dec 6 20:30:04 UTC 2016&quot;, &quot;machine&quot; : &quot;x86_64&quot; }, &quot;somap&quot; : [ { &quot;b&quot; : &quot;55BDABB29000&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;5D8C9D117F82131B933E62A27F586DA0D2A676E0&quot; }, { &quot;b&quot; : &quot;7FFDB2FF2000&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;38233CA92BDB22C6A3479C6E427C85F466F9FDFB&quot; }, { &quot;b&quot; : &quot;7F04C5BDC000&quot;, &quot;path&quot; : &quot;/usr/lib64/libssl.so.10&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6AF827B6FD200DFDFE70B2BC8D66BBC9881E8817&quot; }, { &quot;b&quot; : &quot;7F04C57F6000&quot;, &quot;path&quot; : &quot;/lib64/libcrypto.so.10&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;83F15DBCD0653F417E98354BC1EED6F96A758367&quot; }, { &quot;b&quot; : &quot;7F04C55EE000&quot;, &quot;path&quot; : &quot;/lib64/librt.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;2B3151901240D9E854E18E6D0B181C4D580ABA9C&quot; }, { &quot;b&quot; : &quot;7F04C53EA000&quot;, &quot;path&quot; : &quot;/lib64/libdl.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6335077ACD51527BE9F2F18451A88E2B7350C5B6&quot; }, { &quot;b&quot; : &quot;7F04C50E8000&quot;, &quot;path&quot; : &quot;/lib64/libm.so.6&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6E343508D15886FE83C438DF4560CE40BEB64B56&quot; }, { &quot;b&quot; : &quot;7F04C4ED2000&quot;, &quot;path&quot; : &quot;/lib64/libgcc_s.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;3FD5F89DE59E124AB1419A0BD16775B4096E84FD&quot; }, { &quot;b&quot; : &quot;7F04C4CB6000&quot;, &quot;path&quot; : &quot;/lib64/libpthread.so.0&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;0836319AA81CDFE97DA2666963F62DE6A2A61346&quot; }, { &quot;b&quot; : &quot;7F04C48F4000&quot;, &quot;path&quot; : &quot;/lib64/libc.so.6&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;5D38A77E8D79E98D717281031C39B9A341323BD1&quot; }, { &quot;b&quot; : &quot;7F04C5E49000&quot;, &quot;path&quot; : &quot;/lib64/ld-linux-x86-64.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;93D931BA041229929E5F099514B20E36A70BD651&quot; }, { &quot;b&quot; : &quot;7F04C46A8000&quot;, &quot;path&quot; : &quot;/lib64/libgssapi_krb5.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;E203354E7F907ACC8C3028FE465541B666DCFBA0&quot; }, { &quot;b&quot; : &quot;7F04C43C3000&quot;, &quot;path&quot; : &quot;/lib64/libkrb5.so.3&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;D769C8FFAF8772FDA55031ABF2E167DF2207E378&quot; }, { &quot;b&quot; : &quot;7F04C41C0000&quot;, &quot;path&quot; : &quot;/usr/lib64/libcom_err.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;5C01209C5AE1B1714F19B07EB58F2A1274B69DC8&quot; }, { &quot;b&quot; : &quot;7F04C3F8E000&quot;, &quot;path&quot; : &quot;/lib64/libk5crypto.so.3&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6C2243D37143F7FD1E16ED1F6CE4D7F16C2D7EF1&quot; }, { &quot;b&quot; : &quot;7F04C3D78000&quot;, &quot;path&quot; : &quot;/lib64/libz.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;89C6AF118B6B4FB6A73AE1813E2C8BDD722956D1&quot; }, { &quot;b&quot; : &quot;7F04C3B69000&quot;, &quot;path&quot; : &quot;/lib64/libkrb5support.so.0&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;744272FEAAABCE629AB9E11FAA4A96AEBE8BC2B4&quot; }, { &quot;b&quot; : &quot;7F04C3966000&quot;, &quot;path&quot; : &quot;/lib64/libkeyutils.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;37A58210FA50C91E09387765408A92909468D25B&quot; }, { &quot;b&quot; : &quot;7F04C374C000&quot;, &quot;path&quot; : &quot;/lib64/libresolv.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;1285F9516FFCF13FC00BD135C5634AF2EB16C80B&quot; }, { &quot;b&quot; : &quot;7F04C352B000&quot;, &quot;path&quot; : &quot;/usr/lib64/libselinux.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;F5054DC94443326819FBF3065CFDF5E4726F57EE&quot; }, { &quot;b&quot; : &quot;7F04C3318000&quot;, &quot;path&quot; : &quot;/lib64/libnss_files.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;C12ADA079EA7897F6DBA51ED9B8EFDC7395A618B&quot; } ] }}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo15printStackTraceERSo+0x41) [0x55bdac6cd681]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(+0xBA3779) [0x55bdac6cc779]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(+0xBA3C5D) [0x55bdac6ccc5d]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; libpthread.so.0(+0xF100) [0x7f04c4cc5100]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; libc.so.6(gsignal+0x37) [0x7f04c49295f7]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; libc.so.6(abort+0x148) [0x7f04c492ace8]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo17invariantOKFailedEPKcRKNS_6StatusES1_j+0x0) [0x55bdabf0929c]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo18AsyncResultsMerger9nextEventEv+0x158) [0x55bdac5a8818]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo16RouterStageMerge4nextEv+0x53) [0x55bdac5bc433]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo16RouterStageLimit4nextEv+0x71) [0x55bdac5bbf11]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo23ClusterClientCursorImpl4nextEv+0x35E) [0x55bdac5b016e]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(+0xA8FC41) [0x55bdac5b8c41]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo11ClusterFind8runQueryEPNS_16OperationContextERKNS_14CanonicalQueryERKNS_21ReadPreferenceSettingEPSt6vectorINS_7BSONObjESaISA_EEPSA_+0x5A0) [0x55bdac5ba880]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(+0xA040A0) [0x55bdac52d0a0]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo7Command17execCommandClientEPNS_16OperationContextEPS0_iPKcRNS_7BSONObjERNS_14BSONObjBuilderE+0xB5F) [0x55bdac5d34df]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(+0xA62E34) [0x55bdac58be34]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo8Strategy15clientCommandOpEPNS_16OperationContextERNS_7RequestE+0xA00) [0x55bdac58d420]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo7Request7processEPNS_16OperationContextEi+0x679) [0x55bdac586759]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(_ZN5mongo23ServiceEntryPointMongos12_sessionLoopERKSt10shared_ptrINS_9transport7SessionEE+0x1FD) [0x55bdabf4d77d]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; mongos(+0xB13CD2) [0x55bdac63ccd2]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; libpthread.so.0(+0x7DC5) [0x7f04c4cbddc5]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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; libc.so.6(clone+0x6D) [0x7f04c49eac9d]&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;-----  END BACKTRACE  -----&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;</comment>
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