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<channel>
    <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-27065] Segfault in building an aggregation</title>
                <link>https://jira.mongodb.org/browse/SERVER-27065</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Low severity (extreme circumstances) crash.&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;[MongoDFixture:job0] 2016-11-14T13:27:33.230-0500 F -        [conn12] Got signal: 11 (Segmentation fault).&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;[MongoDFixture:job0] &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;[MongoDFixture:job0]  0x7f03dbca2092 0x7f03dbca13f9 0x7f03dbca19d7 0x7f03d974e330 0x7f03db21ecb9 0x7f03db21f7ae 0x7f03db2202ee 0x7f03db1c06cb 0x7f03db196e3b 0x7f03db197ed0 0x7f03db7bad13 0x7f03db3bb4ef 0x7f03dafa3c94 0x7f03dafa45fd 0x7f03dbc1b29e 0x7f03d9746184 0x7f03d947337d&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;[MongoDFixture:job0] ----- 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;[MongoDFixture:job0] {&quot;backtrace&quot;:[{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;14EB092&quot;,&quot;s&quot;:&quot;_ZN5mongo15printStackTraceERSo&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;14EA3F9&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;14EA9D7&quot;},{&quot;b&quot;:&quot;7F03D973E000&quot;,&quot;o&quot;:&quot;10330&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;A67CB9&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;A687AE&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;A692EE&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;A096CB&quot;,&quot;s&quot;:&quot;_ZN5mongo7FindCmd3runEPNS_16OperationContextERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderE&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;9DFE3B&quot;,&quot;s&quot;:&quot;_ZN5mongo7Command3runEPNS_16OperationContextERKNS_3rpc16RequestInterfaceEPNS3_21ReplyBuilderInterfaceE&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;9E0ED0&quot;,&quot;s&quot;:&quot;_ZN5mongo7Command11execCommandEPNS_16OperationContextEPS0_RKNS_3rpc16RequestInterfaceEPNS4_21ReplyBuilderInterfaceE&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;1003D13&quot;,&quot;s&quot;:&quot;_ZN5mongo11runCommandsEPNS_16OperationContextERKNS_3rpc16RequestInterfaceEPNS2_21ReplyBuilderInterfaceE&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;C044EF&quot;,&quot;s&quot;:&quot;_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;7ECC94&quot;,&quot;s&quot;:&quot;_ZN5mongo23ServiceEntryPointMongod12_sessionLoopERKSt10shared_ptrINS_9transport7SessionEE&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;7ED5FD&quot;},{&quot;b&quot;:&quot;7F03DA7B7000&quot;,&quot;o&quot;:&quot;146429E&quot;},{&quot;b&quot;:&quot;7F03D973E000&quot;,&quot;o&quot;:&quot;8184&quot;},{&quot;b&quot;:&quot;7F03D9379000&quot;,&quot;o&quot;:&quot;FA37D&quot;,&quot;s&quot;:&quot;clone&quot;}],&quot;processInfo&quot;:{ &quot;mongodbVersion&quot; : &quot;3.4.0-rc2-90-ga79c8b6&quot;, &quot;gitVersion&quot; : &quot;a79c8b6455ba50d40f42bead5ce24a6093734dc3&quot;, &quot;compiledModules&quot; : [], &quot;uname&quot; : { &quot;sysname&quot; : &quot;Linux&quot;, &quot;release&quot; : &quot;3.13.0-36-generic&quot;, &quot;version&quot; : &quot;#63-Ubuntu SMP Wed Sep 3 21:30:07 UTC 2014&quot;, &quot;machine&quot; : &quot;x86_64&quot; }, &quot;somap&quot; : [ { &quot;b&quot; : &quot;7F03DA7B7000&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;0606DEFCE5335B31504AAF421CAB12126CE57F65&quot; }, { &quot;b&quot; : &quot;7FFF10321000&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;0074678E5FFFF79F46C476077E67057161772F37&quot; }, { &quot;b&quot; : &quot;7F03DA38A000&quot;, &quot;path&quot; : &quot;/lib/x86_64-linux-gnu/librt.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;E2A6DD5048A0A051FD61043BDB69D8CC68192AB7&quot; }, { &quot;b&quot; : &quot;7F03DA186000&quot;, &quot;path&quot; : &quot;/lib/x86_64-linux-gnu/libdl.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;DA9B8C234D0FE9FD8CAAC8970A7EC1B6C8F6623F&quot; }, { &quot;b&quot; : &quot;7F03D9E79000&quot;, &quot;path&quot; : &quot;/usr/lib/x86_64-linux-gnu/libstdc++.so.6&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;33DE07A4AF856622FA878714CCA68CE87C287BEB&quot; }, { &quot;b&quot; : &quot;7F03D9B73000&quot;, &quot;path&quot; : &quot;/lib/x86_64-linux-gnu/libm.so.6&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;D144258E614900B255A31F3FD2283A878670D5BC&quot; }, { &quot;b&quot; : &quot;7F03D995C000&quot;, &quot;path&quot; : &quot;/lib/x86_64-linux-gnu/libgcc_s.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;44F5FF332E0FC3442C094539078D17DCF076B6FF&quot; }, { &quot;b&quot; : &quot;7F03D973E000&quot;, &quot;path&quot; : &quot;/lib/x86_64-linux-gnu/libpthread.so.0&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;31E9F21AE8C10396171F1E13DA15780986FA696C&quot; }, { &quot;b&quot; : &quot;7F03D9379000&quot;, &quot;path&quot; : &quot;/lib/x86_64-linux-gnu/libc.so.6&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;CF699A15CAAE64F50311FC4655B86DC39A479789&quot; }, { &quot;b&quot; : &quot;7F03DA592000&quot;, &quot;path&quot; : &quot;/lib64/ld-linux-x86-64.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;D0F537904076D73F29E4A37341F8A449E2EF6CD0&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;[MongoDFixture:job0]  mongod(_ZN5mongo15printStackTraceERSo+0x32) [0x7f03dbca2092]&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;[MongoDFixture:job0]  mongod(+0x14EA3F9) [0x7f03dbca13f9]&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;[MongoDFixture:job0]  mongod(+0x14EA9D7) [0x7f03dbca19d7]&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;[MongoDFixture:job0]  libpthread.so.0(+0x10330) [0x7f03d974e330]&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;[MongoDFixture:job0]  mongod(+0xA67CB9) [0x7f03db21ecb9]&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;[MongoDFixture:job0]  mongod(+0xA687AE) [0x7f03db21f7ae]&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;[MongoDFixture:job0]  mongod(+0xA692EE) [0x7f03db2202ee]&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;[MongoDFixture:job0]  mongod(_ZN5mongo7FindCmd3runEPNS_16OperationContextERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderE+0x104B) [0x7f03db1c06cb]&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;[MongoDFixture:job0]  mongod(_ZN5mongo7Command3runEPNS_16OperationContextERKNS_3rpc16RequestInterfaceEPNS3_21ReplyBuilderInterfaceE+0x68B) [0x7f03db196e3b]&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;[MongoDFixture:job0]  mongod(_ZN5mongo7Command11execCommandEPNS_16OperationContextEPS0_RKNS_3rpc16RequestInterfaceEPNS4_21ReplyBuilderInterfaceE+0x740) [0x7f03db197ed0]&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;[MongoDFixture:job0]  mongod(_ZN5mongo11runCommandsEPNS_16OperationContextERKNS_3rpc16RequestInterfaceEPNS2_21ReplyBuilderInterfaceE+0x233) [0x7f03db7bad13]&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;[MongoDFixture:job0]  mongod(_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE+0xCBF) [0x7f03db3bb4ef]&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;[MongoDFixture:job0]  mongod(_ZN5mongo23ServiceEntryPointMongod12_sessionLoopERKSt10shared_ptrINS_9transport7SessionEE+0x194) [0x7f03dafa3c94]&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;[MongoDFixture:job0]  mongod(+0x7ED5FD) [0x7f03dafa45fd]&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;[MongoDFixture:job0]  mongod(+0x146429E) [0x7f03dbc1b29e]&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;[MongoDFixture:job0]  libpthread.so.0(+0x8184) [0x7f03d9746184]&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;[MongoDFixture:job0]  libc.so.6(clone+0x6D) [0x7f03d947337d]&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;[MongoDFixture:job0] -----  END 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;   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;[MongoDFixture:job0] 2016-11-14T13:27:33.230-0500 F -        [conn7] Invalid access at address: 0x60&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="332296">SERVER-27065</key>
            <summary>Segfault in building an aggregation</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Wed, 16 Nov 2016 16:38:33 +0000</created>
                <updated>Wed, 5 Apr 2017 11:43:43 +0000</updated>
                            <resolved>Sat, 3 Dec 2016 00:03:42 +0000</resolved>
                                                    <fixVersion>3.5.1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1448420" author="xgen-internal-githook" created="Sat, 3 Dec 2016 00:03:10 +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-27065&quot; title=&quot;Segfault in building an aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27065&quot;&gt;&lt;del&gt;SERVER-27065&lt;/del&gt;&lt;/a&gt; cleanup ClientCursor, ClientCursorPin, and CursorManager&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Makes cursors come into existence pinned. This fixes a&lt;br/&gt;
   race condition in which a cursor could time out in between&lt;br/&gt;
   being constructed/retrieved and being pinned.&lt;/li&gt;
	&lt;li&gt;Reduces the public interface of ClientCursor. In&lt;br/&gt;
   particular, makes ClientCursor&apos;s constructor and&lt;br/&gt;
   destructor private.&lt;/li&gt;
	&lt;li&gt;Cleans up header file comments in order to more clearly&lt;br/&gt;
   indicate expected usage.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1e8f34fc476705888f7dec8d06c780de4e556988&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1e8f34fc476705888f7dec8d06c780de4e556988&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="1436020" author="david.storch" created="Wed, 16 Nov 2016 21:35:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;&apos;s diagnosis of the problem is this:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;The problem is that the pipeline creates a cursor and pins it in separate steps. An aggressive cursor timeout (or unfathomably unlucky scheduling) can cause the cursor to be deregistered by the client cursor monitor before the ClientCursorPin (which does a lookup on the cursorId) sets state that would prevent that.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Specifically, this gives rise to a situation in which &lt;tt&gt;ClientCursorPin::_cursor&lt;/tt&gt; is null. The downstream code does not expect a &lt;tt&gt;ClientCursorPin&lt;/tt&gt; to ever exist without a pinned &lt;tt&gt;ClientCursor&lt;/tt&gt;. This results in a null pointer dereference here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc3/src/mongo/db/commands/pipeline_command.cpp#L563&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.4.0-rc3/src/mongo/db/commands/pipeline_command.cpp#L563&lt;/a&gt; &lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="63600">SERVER-8369</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                    </issuelinks>
                <attachments>
                            <attachment id="144296" name="repro.patch" size="5612" author="daniel.gottlieb@mongodb.com" created="Tue, 15 Nov 2016 21:35:11 +0000"/>
                            <attachment id="144295" name="sample_fix.patch" size="3220" author="daniel.gottlieb@mongodb.com" created="Wed, 16 Nov 2016 16:29:30 +0000"/>
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