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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-32432] Race condition causes seg fault in ReplicationCoordinatorExternalStateImpl shutdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-32432</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In ReplicationCoordinatorExternalStateImpl, we begin running a SyncSourceFeedback on a background thread, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6796859387ba77a3556ed583a317681a288970e4/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L245-L247&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;passing it a pointer to a BackgroundSync object&lt;/a&gt; that we hold via unique_ptr.  On shutdown, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6796859387ba77a3556ed583a317681a288970e4/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L262&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;std::move our BackgroundSync&lt;/a&gt; object before we call shutdown() on _syncSourceFeedback.  If the SyncSourceFeedback run() loop is in the wrong place at this time, it will try to deference its BackgroundSync pointer and seg fault.&lt;/p&gt;

&lt;p&gt;A fix would be to use a shared_ptr here to hold the BackgroundSync object, or to re-order the shutdown logic in the replication coordinator to eliminate this race.&lt;/p&gt;

&lt;p&gt;I saw this segmentation fault in a patch build with the following trace:&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;[js_test:config_server_checks] 2017-12-20T19:41:35.701+0000 c20010| 2017-12-20T19:41:34.397+0000 I REPL     [signalProcessingThread] Stopping replication reporter thread&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;[js_test:config_server_checks] 2017-12-20T19:41:35.705+0000 c20010| 2017-12-20T19:41:34.397+0000 F -        [SyncSourceFeedback] Invalid access at address: 0x30&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;[js_test:config_server_checks] 2017-12-20T19:41:35.714+0000 c20010| 2017-12-20T19:41:34.397+0000 I NETWORK  [conn1] Error sending response to client: SocketException: Broken pipe. Ending connection from 127.0.0.1:55862 (connection id: 1)&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;[js_test:config_server_checks] 2017-12-20T19:41:35.717+0000 c20010| 2017-12-20T19:41:34.397+0000 I NETWORK  [conn1] end connection 127.0.0.1:55862 (2 connections now open)&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;[js_test:config_server_checks] 2017-12-20T19:41:35.732+0000 c20010| 2017-12-20T19:41:34.408+0000 F -        [SyncSourceFeedback] 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;[js_test:config_server_checks] 2017-12-20T19:41:35.739+0000 c20010|&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;[js_test:config_server_checks] 2017-12-20T19:41:35.753+0000 c20010|  0x7f56a8ecefe1 0x7f56a8ece1f9 0x7f56a8ece866 0x7f56a3f3d7e0 0x7f56a3f37470 0x7f56a7ac8e98 0x7f56a7a2db2b 0x7f56a8fdca20 0x7f56a3f35aa1 0x7f56a3c82bcd&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;[js_test:config_server_checks] 2017-12-20T19:41:35.756+0000 c20010| ----- 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;[js_test:config_server_checks] 2017-12-20T19:41:35.807+0000 c20010| {&quot;backtrace&quot;:[{&quot;b&quot;:&quot;7F56A6BA7000&quot;,&quot;o&quot;:&quot;2327FE1&quot;,&quot;s&quot;:&quot;_ZN5mongo15printStackTraceERSo&quot;},{&quot;b&quot;:&quot;7F56A6BA7000&quot;,&quot;o&quot;:&quot;23271F9&quot;},{&quot;b&quot;:&quot;7F56A6BA7000&quot;,&quot;o&quot;:&quot;2327866&quot;},{&quot;b&quot;:&quot;7F56A3F2E000&quot;,&quot;o&quot;:&quot;F7E0&quot;},{&quot;b&quot;:&quot;7F56A3F2E000&quot;,&quot;o&quot;:&quot;9470&quot;,&quot;s&quot;:&quot;pthread_mutex_lock&quot;},{&quot;b&quot;:&quot;7F56A6BA7000&quot;,&quot;o&quot;:&quot;F21E98&quot;,&quot;s&quot;:&quot;_ZNK5mongo4repl14BackgroundSync13getSyncTargetEv&quot;},{&quot;b&quot;:&quot;7F56A6BA7000&quot;,&quot;o&quot;:&quot;E86B2B&quot;,&quot;s&quot;:&quot;_ZN5mongo4repl18SyncSourceFeedback3runEPNS_8executor12TaskExecutorEPNS0_14BackgroundSyncEPNS0_22ReplicationCoordinatorE&quot;},{&quot;b&quot;:&quot;7F56A6BA7000&quot;,&quot;o&quot;:&quot;2435A20&quot;},{&quot;b&quot;:&quot;7F56A3F2E000&quot;,&quot;o&quot;:&quot;7AA1&quot;},{&quot;b&quot;:&quot;7F56A3B9A000&quot;,&quot;o&quot;:&quot;E8BCD&quot;,&quot;s&quot;:&quot;clone&quot;}],&quot;processInfo&quot;:{ &quot;mongodbVersion&quot; : &quot;3.7.0-322-g0b7976614d-patch-5a3aad36e3c331171c00095f&quot;, &quot;gitVersion&quot; : &quot;0b7976614d028105a203147fe571b3c264e920b3&quot;, &quot;compiledModules&quot; : [ &quot;enterprise&quot; ], &quot;uname&quot; : { &quot;sysname&quot; : &quot;Linux&quot;, &quot;release&quot; : &quot;2.6.32-220.el6.x86_64&quot;, &quot;version&quot; : &quot;#1 SMP Wed Nov 9 08:03:13 EST 2011&quot;, &quot;machine&quot; : &quot;x86_64&quot; }, &quot;somap&quot; : [ { &quot;b&quot; : &quot;7F56A6BA7000&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;3C44E2CD7A5B8F61C8248BD49879A6D3F4BA1C5F&quot; }, { &quot;b&quot; : &quot;7FFFBA2FF000&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;08F634A1D22DEFF00461D50A7699DACDC97657BF&quot; }, { &quot;b&quot; : &quot;7F56A6738000&quot;, &quot;path&quot; : &quot;/usr/lib64/libnetsnmpagent.so.20&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;1270BB069D761BD79C79F8986BB3ED5DCAA7D06D&quot; }, { &quot;b&quot; : &quot;7F56A6512000&quot;, &quot;path&quot; 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: 3, &quot;buildId&quot; : &quot;E7B49911F1136073DD7DC58E8118CD9A4FBE2A19&quot; }, { &quot;b&quot; : &quot;7F1874F18000&quot;, &quot;path&quot; : &quot;/lib64/libz.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;D053BB4FF0C2FC983842F81598813B9B931AD0D1&quot; }, { &quot;b&quot; : &quot;7F56A2508000&quot;, &quot;path&quot; : &quot;/usr/lib64/libsensors.so.4&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6855E5BF5B3634C15F01B1043BD892D727EE3C08&quot; }, { &quot;b&quot; : &quot;7F1870EBB000&quot;, &quot;path&quot; : &quot;/usr/lib64/libssl3.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;C5EB2766ABF9ACE9E4556548DC04A37131788870&quot; }, { &quot;b&quot; : &quot;7F187088F000&quot;, &quot;path&quot; : &quot;/usr/lib64/libsmime3.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6842A55418527250648A1836541354C79613F8BD&quot; }, { &quot;b&quot; : &quot;7F1870D4C000&quot;, &quot;path&quot; : &quot;/usr/lib64/libnss3.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;9221B9CD4B38C4C3FE22B82AA65E2405860E79CA&quot; }, { &quot;b&quot; : &quot;7F187231F000&quot;, &quot;path&quot; : &quot;/usr/lib64/libnssutil3.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;F1484D8815EFE9CC47C437AE0AA7A89A3B5A3A24&quot; }, { &quot;b&quot; : &quot;7F187191B000&quot;, &quot;path&quot; : &quot;/lib64/libplds4.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;21B62D06504B5AC5A7A849E7C8B919DF357EBEFE&quot; }, { &quot;b&quot; : &quot;7F1870F16000&quot;, &quot;path&quot; : &quot;/lib64/libplc4.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;83EB817989559AE1CBAE20564AAAB42D61532D9E&quot; }, { &quot;b&quot; : &quot;7F18720D8000&quot;, &quot;path&quot; : &quot;/lib64/libnspr4.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;993E6315CCFCEA516F5A0F993632DFE1A4A395A4&quot; }, { &quot;b&quot; : &quot;7F186EDF1000&quot;, &quot;path&quot; : &quot;/lib64/libkrb5.so.3&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;624C7056B8BBE6BA758DEF557F516FBDBD01E1FD&quot; }, { &quot;b&quot; : &quot;7F186DFC5000&quot;, &quot;path&quot; : &quot;/lib64/libk5crypto.so.3&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;C81673692EEF670BC951EE726490F5D1CAB822F4&quot; }, { &quot;b&quot; : &quot;7F18721C1000&quot;, &quot;path&quot; : &quot;/lib64/libcom_err.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;088FB9EC41563FE043C14CA969FB38468B647B2E&quot; }, { &quot;b&quot; : &quot;7F186DFB6000&quot;, &quot;path&quot; : &quot;/lib64/libkrb5support.so.0&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;03B69EEB8998AC9CA7519A27571BAD976BA4C56D&quot; }, { &quot;b&quot; : &quot;7F186EDB3000&quot;, &quot;path&quot; : &quot;/lib64/libkeyutils.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;3BCCABE75DC61BBA81AAE45D164E26EF4F9F55DB&quot; }, { &quot;b&quot; : &quot;7F186CB81000&quot;, &quot;path&quot; : &quot;/lib64/libidn.so.11&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;5659EB985475B586E3BBCB95BA21F4A30BE5EBF4&quot; }, { &quot;b&quot; : &quot;7F56A0559000&quot;, &quot;path&quot; : &quot;/usr/lib64/libssh2.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;8727EC925D6D91DAC74A99BDE8B3C6EE96AF13EA&quot; }, { &quot;b&quot; : &quot;7F186F756000&quot;, &quot;path&quot; : &quot;/lib64/libfreebl3.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;AFF1C795A3CF422C9F8AC32C7522F6376B1EA087&quot; }, { &quot;b&quot; : &quot;7F186FD45000&quot;, &quot;path&quot; : &quot;/lib64/libbz2.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;1250B1D041DD7552F0C870BB188DC3A34DF2651D&quot; }, { &quot;b&quot; : &quot;7F186E72F000&quot;, &quot;path&quot; : &quot;/usr/lib64/libelf.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;50517407A07B8D6C9A55A392E99246B52E8BFEEA&quot; }, { &quot;b&quot; : &quot;7F186F10E000&quot;, &quot;path&quot; : &quot;/usr/lib64/liblzma.so.0&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6FF9BAEEEE9DDEEF2DFA5CBD36147A75891C0AD4&quot; }, { &quot;b&quot; : &quot;7F186CEE1000&quot;, &quot;path&quot; : &quot;/usr/lib64/liblua-5.1.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;6BDB4E1990D6EBA12A5C8D39A7650DB8798BF568&quot; }, { &quot;b&quot; : &quot;7F18714C2000&quot;, &quot;path&quot; : &quot;/lib64/libselinux.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;B4576BE308DDCF7BC31F7304E4734C3D846D0236&quot; }, { &quot;b&quot; : &quot;7F186CEBE000&quot;, &quot;path&quot; : &quot;/lib64/libcap.so.2&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;A436538388F1F25113FDA834CA2EED524EFA17D6&quot; }, { &quot;b&quot; : &quot;7F186D8B6000&quot;, &quot;path&quot; : &quot;/lib64/libacl.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;26CC708AC7C0FC1797A2340C024F0ADD0CE054D8&quot; }, { &quot;b&quot; : &quot;7F186DD41000&quot;, &quot;path&quot; : &quot;/lib64/libdb-4.7.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;D91C702275E2039E98E39925B02FF5C53A6C3312&quot; }, { &quot;b&quot; : &quot;7F186F33C000&quot;, &quot;path&quot; : &quot;/lib64/libattr.so.1&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;8EF0683858704EF173AB11B1E27076F37F82B7B6&quot; }, { &quot;b&quot; : &quot;7F569ED37000&quot;, &quot;path&quot; : &quot;/usr/lib64/sasl2/liblogin.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;9D19F93E342AA4EE2D646E64642625F365056E5C&quot; }, { &quot;b&quot; : &quot;7F569EB31000&quot;, &quot;path&quot; : &quot;/usr/lib64/sasl2/libsasldb.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;4514552B5354286A143770420B38F2D5985D7FA1&quot; }, { &quot;b&quot; : &quot;7F569E924000&quot;, &quot;path&quot; : &quot;/usr/lib64/sasl2/libdigestmd5.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;34D8E3E2565DEF4A685D6976831B0372AD456993&quot; }, { &quot;b&quot; : &quot;7F569E71F000&quot;, &quot;path&quot; : &quot;/usr/lib64/sasl2/libanonymous.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;EEAA33A75735D35F4BF25C3C2830B8C90ABDD8B5&quot; }, { &quot;b&quot; : &quot;7F569E517000&quot;, &quot;path&quot; : &quot;/usr/lib64/sasl2/libgssapiv2.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;F7BCE9C6BFF4EAF0CB3142B299CF22D094CE4F04&quot; }, { &quot;b&quot; : &quot;7F569E311000&quot;, &quot;path&quot; : &quot;/usr/lib64/sasl2/libcrammd5.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;4CC7E695963F5C8B772EDFF456DB67F89E58FBD6&quot; }, { &quot;b&quot; : &quot;7F569E10C000&quot;, &quot;path&quot; : &quot;/usr/lib64/sasl2/libplain.so&quot;, &quot;elfType&quot; : 3, &quot;buildId&quot; : &quot;F8DDC7A3CA1CE5B75719AE0DC821647B609D17B6&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;[js_test:config_server_checks] 2017-12-20T19:41:35.810+0000 c20010|  mongod(_ZN5mongo15printStackTraceERSo+0x41) [0x7f56a8ecefe1]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.828+0000 c20010|  mongod(+0x23271F9) [0x7f56a8ece1f9]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.832+0000 c20010|  mongod(+0x2327866) [0x7f56a8ece866]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.835+0000 c20010|  libpthread.so.0(+0xF7E0) [0x7f56a3f3d7e0]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.838+0000 c20010|  libpthread.so.0(pthread_mutex_lock+0x0) [0x7f56a3f37470]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.847+0000 c20010|  mongod(_ZNK5mongo4repl14BackgroundSync13getSyncTargetEv+0x48) [0x7f56a7ac8e98]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.855+0000 c20010|  mongod(_ZN5mongo4repl18SyncSourceFeedback3runEPNS_8executor12TaskExecutorEPNS0_14BackgroundSyncEPNS0_22ReplicationCoordinatorE+0x4EB) [0x7f56a7a2db2b]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.861+0000 c20010|  mongod(+0x2435A20) [0x7f56a8fdca20]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.863+0000 c20010|  libpthread.so.0(+0x7AA1) [0x7f56a3f35aa1]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.872+0000 c20010|  libc.so.6(clone+0x6D) [0x7f56a3c82bcd]&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;[js_test:config_server_checks] 2017-12-20T19:41:35.874+0000 c20010| -----  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;   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;[js_test:config_server_checks] 2017-12-20T19:41:35.954+0000 2017-12-20T19:41:35.949+0000 I -        [thread1] shell: stopped mongo program on port 20010&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;[js_test:config_server_checks] 2017-12-20T19:41:35.960+0000 2017-12-20T19:41:35.949+0000 E QUERY    [thread1] StopError: MongoDB process stopped with exit code: -11 :&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;[js_test:config_server_checks] 2017-12-20T19:41:35.963+0000 StopError: MongoDB process stopped with exit code: -11&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;[js_test:config_server_checks] 2017-12-20T19:41:35.964+0000 MongoRunner.StopError@src/mongo/shell/servers.js:800:48&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;[js_test:config_server_checks] 2017-12-20T19:41:35.966+0000 MongoRunner.stopMongod@src/mongo/shell/servers.js:888:19&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;[js_test:config_server_checks] 2017-12-20T19:41:35.974+0000 ReplSetTest/this.stop@src/mongo/shell/replsettest.js:1922:19&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;[js_test:config_server_checks] 2017-12-20T19:41:35.978+0000 ReplSetTest/this.stopSet@src/mongo/shell/replsettest.js:1943:13&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;[js_test:config_server_checks] 2017-12-20T19:41:35.985+0000 @jstests/replsets/config_server_checks.js:41:9&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;[js_test:config_server_checks] 2017-12-20T19:41:35.988+0000 @jstests/replsets/config_server_checks.js:22:6&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;[js_test:config_server_checks] 2017-12-20T19:41:35.991+0000 @jstests/replsets/config_server_checks.js:19:2&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;[js_test:config_server_checks] 2017-12-20T19:41:36.015+0000 failed to load: jstests/replsets/config_server_checks.js&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="474867">SERVER-32432</key>
            <summary>Race condition causes seg fault in ReplicationCoordinatorExternalStateImpl shutdown</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="samantha.ritter@mongodb.com">Samantha Ritter</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 20 Dec 2017 21:19:42 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:45 +0000</updated>
                            <resolved>Fri, 12 Jan 2018 20:48:18 +0000</resolved>
                                                    <fixVersion>3.6.3</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1785622" author="xgen-internal-githook" created="Fri, 26 Jan 2018 03:53:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;username&apos;: &apos;visualzhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32432&quot; title=&quot;Race condition causes seg fault in ReplicationCoordinatorExternalStateImpl shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32432&quot;&gt;&lt;del&gt;SERVER-32432&lt;/del&gt;&lt;/a&gt; Race condition causes seg fault in ReplicationCoordinatorExternalStateImpl shutdown&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ca539d91d8da0080b348196b07c9d4e464d4e40e)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/57b84048201216c6385e549eba14c6b27aade6bf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/57b84048201216c6385e549eba14c6b27aade6bf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1773293" author="xgen-internal-githook" created="Fri, 12 Jan 2018 20:46:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;username&apos;: &apos;visualzhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32432&quot; title=&quot;Race condition causes seg fault in ReplicationCoordinatorExternalStateImpl shutdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32432&quot;&gt;&lt;del&gt;SERVER-32432&lt;/del&gt;&lt;/a&gt; Race condition causes seg fault in ReplicationCoordinatorExternalStateImpl shutdown&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca539d91d8da0080b348196b07c9d4e464d4e40e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca539d91d8da0080b348196b07c9d4e464d4e40e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1766869" author="siyuan.zhou@10gen.com" created="Sat, 6 Jan 2018 02:52:27 +0000"  >&lt;p&gt;To make the issue clear. Moving a unique pointer won&apos;t touch the underlining raw pointer, but because the function that &lt;tt&gt;_syncSourceFeedbackThread&lt;/tt&gt; runs may starts after the move, &lt;tt&gt;_bgSync&lt;/tt&gt; could already be empty.&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;    _syncSourceFeedbackThread = stdx::make_unique&amp;lt;stdx::&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;thread&lt;/span&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;&amp;gt;([&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;this&lt;/span&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;, replCoord] {&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;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// If this line runs later than stopReplication(), then _bgSync will be null pointer.&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;        _syncSourceFeedback.run(_taskExecutor.get(), _bgSync.get(), replCoord);&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;   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;    });&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;All failures happened right after the replication gets started, so the lambda hasn&apos;t run yet when shutdown and &lt;tt&gt;_stopDataReplication_inlock&lt;/tt&gt; get called. As a result, &lt;tt&gt;_bgSync.get()&lt;/tt&gt; gives a null pointer to sync source resolver. To fix it, we can dereference &lt;tt&gt;_bgSync.get()&lt;/tt&gt; earlier and put the raw pointer to the capture list of the lambda.&lt;/p&gt;</comment>
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