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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>[CDRIVER-3823] Crash while calling pthread_join to shut down server monitor thread</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-3823</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;I will fill this in more on Monday, just opening the ticket now before I forget. I now have a minimal repro in Swift of this but have not gotten a chance to translate it to equivalent C code.&lt;/p&gt;

&lt;p&gt;The gist is that since upgrading to libmongoc 1.17.0 in the Swift driver we have been experiencing somewhat frequent failures of our transactions tests on macOS. Locally I am now finding that in particular this test fails for me about 90% of the time:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/specifications/blob/1aa2135d930a6230b7469c02377c33e121f9719e/source/transactions/tests/mongos-recovery-token.yml#L178&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/specifications/blob/1aa2135d930a6230b7469c02377c33e121f9719e/source/transactions/tests/mongos-recovery-token.yml#L178&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Specifically, when destroying the test MongoClient (which is backed by a client pool), there seems to be a crash while calling &lt;tt&gt;pthread_join&lt;/tt&gt; to shut down the server monitor threads, and the Swift program exits with signal code 13.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1566066">CDRIVER-3823</key>
            <summary>Crash while calling pthread_join to shut down server monitor thread</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="samantha.ritter@mongodb.com">Samantha Ritter</assignee>
                                    <reporter username="kaitlin.mahar@mongodb.com">Kaitlin Mahar</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Dec 2020 01:31:14 +0000</created>
                <updated>Sat, 28 Oct 2023 11:28:36 +0000</updated>
                            <resolved>Fri, 8 Jan 2021 15:42:38 +0000</resolved>
                                                    <fixVersion>1.17.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3591639" author="xgen-internal-githook" created="Mon, 1 Feb 2021 03:45:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Samantha Ritter&apos;, &apos;email&apos;: &apos;samantha.f.ritter@gmail.com&apos;, &apos;username&apos;: &apos;samantharitter&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3823&quot; title=&quot;Crash while calling pthread_join to shut down server monitor thread&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3823&quot;&gt;&lt;del&gt;CDRIVER-3823&lt;/del&gt;&lt;/a&gt; ignore SIGPIPE on osx (#716)&lt;br/&gt;
Branch: r1.17&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/3ebee773aa9d17e87caa63fe9fa27587b12bdc79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/3ebee773aa9d17e87caa63fe9fa27587b12bdc79&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3554951" author="samantha.ritter@10gen.com" created="Fri, 8 Jan 2021 15:42:38 +0000"  >&lt;p&gt;Fixed by &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/6f423a4044fd203af51cac1cac01588f34169610&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/6f423a4044fd203af51cac1cac01588f34169610&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3553131" author="kaitlin.mahar" created="Thu, 7 Jan 2021 17:34:37 +0000"  >&lt;p&gt;Yes!&lt;/p&gt;

&lt;p&gt;Thanks for the explanation, that sounds very reasonable and explains why we only see this on macOS tests. It is surprising that this hasn&apos;t come up before. I suppose it is highly sensitive to timing. I guess some confluence of factors involving the new server monitor changes, as well as our tweaking of the heartbeat frequency (we started doing that when we vendored in 1.17, in part to alleviate test slowdown introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3801&quot; title=&quot;mongoc_client_pool_destroy performance degradation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3801&quot;&gt;&lt;del&gt;CDRIVER-3801&lt;/del&gt;&lt;/a&gt;) has somehow created a situation where it is more prone to occur.&lt;/p&gt;</comment>
                            <comment id="3553015" author="samantha.ritter@10gen.com" created="Thu, 7 Jan 2021 16:59:20 +0000"  >&lt;p&gt;Code review: &lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/pull/716&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/pull/716&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3552757" author="samantha.ritter@10gen.com" created="Thu, 7 Jan 2021 15:55:17 +0000"  >&lt;p&gt;Thank you for that clarification, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaitlin.mahar&quot; class=&quot;user-hover&quot; rel=&quot;kaitlin.mahar&quot;&gt;kaitlin.mahar&lt;/a&gt;!  So then we think the patch worked to fix this crash, right?  That&apos;s great!&lt;/p&gt;

&lt;p&gt;I did a little more research into SIGPIPE.  I wanted to understand why we haven&apos;t seen this issue before.&lt;/p&gt;

&lt;p&gt;SIGPIPE is emitted when a program tries to write to a socket whose &quot;read&quot; end has been closed.  It&apos;s common practice for networking code to ignore SIGPIPE when send()ing, and handle the write error gracefully instead of having the signal crash their program.&lt;/p&gt;

&lt;p&gt;The C driver socket code makes an effort to ignore SIGPIPE on POSIX systems.  To do this, we use the MSG_NOSIGNAL flag.  However, despite being standardized POSIX, MSG_NOSIGNAL is not defined on OSX (boo).  So, it seems that we were never ignoring this signal on OSX!  I am surprised that this is the first time this issue has surfaced.&lt;/p&gt;

&lt;p&gt;There are a couple of different ways we can ignore SIGPIPE on OSX, one of which is in the patch you tested.  We&apos;ll hash the specifics out in code review.&lt;/p&gt;</comment>
                            <comment id="3547073" author="samantha.ritter@10gen.com" created="Mon, 4 Jan 2021 17:03:49 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaitlin.mahar&quot; class=&quot;user-hover&quot; rel=&quot;kaitlin.mahar&quot;&gt;kaitlin.mahar&lt;/a&gt; would you be willing to apply this patch to your libmongoc build and see if you can still reproduce the error with it?  I haven&apos;t been able to reproduce this crash, but I have a theory about what&apos;s causing it, and the patch tests that theory.&lt;/p&gt;

&lt;p&gt;The patch is on this branch on my fork: &lt;a href=&quot;https://github.com/samantharitter/mongo-c-driver/commit/32000d379ad5d8315c463f80bbf8a09dccde2f29&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/samantharitter/mongo-c-driver/commit/32000d379ad5d8315c463f80bbf8a09dccde2f29&lt;/a&gt;&lt;br/&gt;
Evergreen patch, to make sure it doesn&apos;t break anything else &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/wink.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt; &lt;a href=&quot;https://evergreen.mongodb.com/version/5ff347aca4cf477c3fae6eec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/version/5ff347aca4cf477c3fae6eec&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3533688" author="kaitlin.mahar" created="Wed, 16 Dec 2020 23:54:52 +0000"  >&lt;p&gt;To provide some detail on how I am reproducing this in Swift, on macOS 10.15:&lt;/p&gt;

&lt;p&gt;1. Start up a sharded cluster, server version 4.4.1, using this mongo-orchestration config: &lt;a href=&quot;https://github.com/mongodb-labs/drivers-evergreen-tools/blob/master/.evergreen/orchestration/configs/sharded_clusters/basic.json&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb-labs/drivers-evergreen-tools/blob/master/.evergreen/orchestration/configs/sharded_clusters/basic.json&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;2. Create a new &lt;tt&gt;mongoc_client_pool_t&lt;/tt&gt;, let&apos;s call it &lt;tt&gt;setupClientPool&lt;/tt&gt;, using connection string &lt;tt&gt;&quot;mongodb://localhost:27017,localhost:27018&quot;&lt;/tt&gt;, and setting &lt;tt&gt;heartbeatFrequencyMS&lt;/tt&gt; to 50 via &lt;tt&gt;mongoc_uri_set_option_as_int32&lt;/tt&gt;. Note: we patch in support to configure a lower-than-standard &lt;tt&gt;minHeartbeatFrequencyMS&lt;/tt&gt; ourselves for the purpose of speeding up tests: &lt;a href=&quot;https://github.com/mongodb/mongo-swift-driver/blob/master/etc/lower-minheartbeatfrequencyms.diff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-swift-driver/blob/master/etc/lower-minheartbeatfrequencyms.diff&lt;/a&gt;, as described in &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/retryable-reads/tests/README.rst#speeding-up-tests&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/specifications/blob/master/source/retryable-reads/tests/README.rst#speeding-up-tests&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;3. using write concern majority and a client from &lt;tt&gt;setupClientPool&lt;/tt&gt;, drop the collection &lt;tt&gt;transactions-tests.test&lt;/tt&gt; using &lt;tt&gt;mongoc_collection_write_command_with_opts&lt;/tt&gt; . return client to pool&lt;/p&gt;

&lt;p&gt;4. using write concern majority and a client from &lt;tt&gt;setupClientPool&lt;/tt&gt;, recreate the collection &lt;tt&gt;transactions-tests.test&lt;/tt&gt; using &lt;tt&gt;mongoc_database_create_collection&lt;/tt&gt;. return client to pool&lt;/p&gt;

&lt;p&gt;5. create a second &lt;tt&gt;mongo_client_pool_t&lt;/tt&gt;, let&apos;s call it &lt;tt&gt;testClientPool&lt;/tt&gt;, also connecting to &lt;tt&gt;&quot;mongodb://localhost:27017,localhost:27018&quot;&lt;/tt&gt;, with heartbeatFrequencyMS=30000.&lt;/p&gt;

&lt;p&gt;6. check out a client &lt;tt&gt;client0&lt;/tt&gt; from &lt;tt&gt;testClientPool&lt;/tt&gt; and start a session &lt;tt&gt;session0&lt;/tt&gt; via &lt;tt&gt;mongoc_client_start_session&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;7. start a transaction on session0 via &lt;tt&gt;mongoc_client_session_start_transaction&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;8. using &lt;tt&gt;client0&lt;/tt&gt; and &lt;tt&gt;session0&lt;/tt&gt;, insert a document (empty except for its driver-generated _id) into transactions-test.test via a bulk write (note that this is just an implementation detail, Swift implements all write ops via libmongoc&apos;s bulk API. you could probably do any write here)&lt;/p&gt;

&lt;p&gt;9. get the id of the mongos that &lt;tt&gt;session0&lt;/tt&gt; is now pinned to. using &lt;tt&gt;mongoc_database_command_with_opts&lt;/tt&gt; and specifying that &lt;tt&gt;id&lt;/tt&gt; as &lt;tt&gt;server_id&lt;/tt&gt; in the options, set this failpoint:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;10. Attempt to commit the transaction on &lt;tt&gt;session0&lt;/tt&gt; via &lt;tt&gt;mongoc_client_session_commit_transaction&lt;/tt&gt; . because of the failpoint, this should fail with an error with codeName &quot;NoSuchTransaction&quot; and the error label &quot;TransientTransactionError&quot;.&lt;/p&gt;

&lt;p&gt;11. End the session, via &lt;tt&gt;mongoc_client_session_destroy&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;12. Attempt to destroy &lt;tt&gt;testClientPool&lt;/tt&gt;. during a call to &lt;tt&gt;pthread_join&lt;/tt&gt;, the process terminates: &lt;tt&gt;Process 56653 exited with status = 0 (0x00000000) Terminated due to signal 13&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;Here is a backtrace to the pthread_join call (I just inserted a breakpoint just before where I am seeing the 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;* thread #1, queue = &apos;com.apple.main-thread&apos;, stop reason = breakpoint 1.1&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;  * frame #0: 0x000000010002ecdc CrashRepro`_thread_join(thread=0x000070000b74d000) at common-thread.c:28:4&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;    frame #1: 0x000000010008f33f CrashRepro`mongoc_server_monitor_request_shutdown(server_monitor=0x0000000100f07f30) at mongoc-server-monitor.c:1202:7&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;    frame #2: 0x000000010008f3d5 CrashRepro`mongoc_server_monitor_wait_for_shutdown(server_monitor=0x0000000100f07f30) at mongoc-server-monitor.c:1228:8&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;    frame #3: 0x0000000100099fa3 CrashRepro`_mongoc_topology_background_monitoring_stop(topology=0x000000010200a400) at mongoc-topology-background-monitoring.c:318:7&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;    frame #4: 0x00000001000a17fb CrashRepro`mongoc_topology_destroy(topology=0x000000010200a400) at mongoc-topology.c:517:7&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;    frame #5: 0x0000000100038e7b CrashRepro`mongoc_client_pool_destroy(pool=0x0000000101807880) at mongoc-client-pool.c:199:4&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;    frame #6: 0x000000010017d691 CrashRepro`closure #1 in ConnectionPool.close(self=0x00000001018074e0) at ConnectionPool.swift:126:17&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;    frame #7: 0x000000010017e2a4 CrashRepro`partial apply for closure #1 in ConnectionPool.close() at &amp;lt;compiler-generated&amp;gt;:0&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;    frame #8: 0x000000010017d71f CrashRepro`thunk for @callee_guaranteed () -&amp;gt; (@error @owned Error) at &amp;lt;compiler-generated&amp;gt;:0&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;    frame #9: 0x000000010017e2c4 CrashRepro`partial apply for thunk for @callee_guaranteed () -&amp;gt; (@error @owned Error) at &amp;lt;compiler-generated&amp;gt;:0&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;    frame #10: 0x000000010017c1f1 CrashRepro`NSCondition.withLock&amp;lt;T&amp;gt;(body=0x000000010017e2b0 CrashRepro`partial apply forwarder for reabstraction thunk helper from @callee_guaranteed () -&amp;gt; (@error @owned Swift.Error) to @escaping @callee_guaranteed () -&amp;gt; (@out (), @error @owned Swift.Error) at &amp;lt;compiler-generated&amp;gt;, self=0x0000000101807760) at ConnectionPool.swift:34:20&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;    frame #11: 0x000000010017d097 CrashRepro`ConnectionPool.close(self=0x00000001018074e0) at ConnectionPool.swift:107:28&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;    frame #12: 0x00000001001a1dfc CrashRepro`MongoClient.syncClose(self=0x0000000101806960) at MongoClient.swift:361:33&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;    frame #13: 0x00000001002f4987 CrashRepro`MongoClient.deinit(self=0x0000000101805dd0) at MongoClient.swift:56:34&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;    frame #14: 0x00000001002f4e89 CrashRepro`MongoClient.__deallocating_deinit(self=0x0000000101805dd0) at MongoClient.swift:0&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;    frame #15: 0x00007fff703631f0 libswiftCore.dylib`_swift_release_dealloc + 16&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;    frame #16: 0x00000001000be460 CrashRepro`main at &amp;lt;compiler-generated&amp;gt;:0&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;    frame #17: 0x00007fff70a45cc9 libdyld.dylib`start + 1&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;to confirm the hypothesis that it is happening sometime during the call to &lt;tt&gt;pthread_join&lt;/tt&gt; I updated the body of the calling method to:&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;   &lt;/span&gt;&lt;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;printf&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;(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;about to call pthread_join\n&quot;&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;);&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;int&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; ret;&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;   ret = pthread_join (&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;, NULL);&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: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;printf&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;(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;done calling pthread_join, exit code was %d%n&quot;&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;, ret);&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;   &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;return&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; ret;&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;The last thing that is printed is &quot;about to call pthread_join&quot;.&lt;/p&gt;

&lt;p&gt;Note line numbers may be slightly off due to slight mangling Swift does of libmongoc to get SwiftPM to build it. you can see our version here &lt;a href=&quot;https://github.com/mongodb/mongo-swift-driver/tree/master/Sources/CLibMongoC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-swift-driver/tree/master/Sources/CLibMongoC&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Also, here is the debug log output throughout this:&lt;/p&gt;

&lt;p&gt;&#160;&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;2020/12/16 18:50:34.0947: [ 6743]:    DEBUG:      monitor: [localhost:27018] command or network error occurred: Failed to read 4 bytes: socket error or timeout&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;2020/12/16 18:50:35.0001: [ 6743]:    DEBUG:      monitor: [localhost:27018] command or network error occurred: Failed to read 4 bytes: socket error or timeout&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;2020/12/16 18:50:35.0107: [ 6743]:  WARNING:       stream: Failed to buffer 4 bytes&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;about to call pthread_join&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;2020/12/16 18:50:35.0161: [ 6743]:    DEBUG:      monitor: [localhost:27018] command or network error occurred: connection closed while polling&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;2020/12/16 18:50:35.0162: [ 6743]:    DEBUG:      monitor: [localhost:27018] command or network error occurred: Failed to read 4 bytes: socket error or timeout&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;2020/12/16 18:50:35.0218: [ 6743]:    DEBUG:      monitor: [localhost:27018] command or network error occurred: Failed to read 4 bytes: socket error or timeout&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;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Signal 13 apparently means broken pipe (&lt;a href=&quot;http://people.cs.pitt.edu/~alanjawi/cs449/code/shell/UnixSignals.htm&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://people.cs.pitt.edu/~alanjawi/cs449/code/shell/UnixSignals.htm&lt;/a&gt;), and when I run this via the command line I get exit code 141 which apparently also has to do with broken pipes. &lt;/p&gt;

&lt;p&gt;Let me know if there is any more info you need!&lt;/p&gt;</comment>
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