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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-22011] Direct writes to the local database can cause deadlock involving the WiredTiger write throttle</title>
                <link>https://jira.mongodb.org/browse/SERVER-22011</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In MongoDB 3.0 we introduced the WiredTiger &lt;a href=&quot;https://docs.mongodb.org/v3.0/reference/parameters/#param.wiredTigerConcurrentWriteTransactions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;write throttle&lt;/a&gt; parameter, which limits the number of concurrent threads running inside the WT storage engine. The write throttle works by acquiring a &apos;ticket&apos; just before entering in the WT storage engine and releasing the ticket when the WT transaction is done.&lt;/p&gt;

&lt;p&gt;The write throttle tickets are in most cases acquired before the &apos;local&apos; database is locked for replication writes. However, if an operation writes to the local database directly, the order of ticket acquisition reverses and the local database lock is acquired first.&lt;/p&gt;

&lt;p&gt;Because of this reversal of the locking order, if there is sufficiently high write load and the number of available tickets is approaching zero, it is possible for a deadlock to occur between a thread which directly writes to the local database and a thread, which just acquired the last ticket. The default value for the WT write throttle is 128, so this would happen when the number of concurrent threads exceeds this value.&lt;/p&gt;

&lt;p&gt;Once the server enters into this state, there is no way to get out of it without restarting it.&lt;/p&gt;

&lt;p&gt;A preventative workaround (in the sense that it should be done before the issue occurs) is to increase the write throttle to a value, which is higher than the maximum projected write load. For example:&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;db.adminCommand({ setParameter: 1, wiredTigerConcurrentWriteTransactions: 4096 });&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;For more detail, here is a sequence of events which resulted in deadlocked threads:&lt;/p&gt;

&lt;p&gt;Thread1 (already holds a ticket and waits on the local DB lock):&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Thread 418 (Thread 0x7efc8ba6e700 (LWP 23482)):&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#0  0x000000327fe0b7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#1  0x00000000009cbe38 in mongo::CondVarLockGrantNotification::wait(unsigned int) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#2  0x00000000009d3133 in mongo::LockerImpl&amp;lt;false&amp;gt;::lockComplete(mongo::ResourceId, mongo::LockMode, unsigned int, bool) ()&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#3  0x00000000009c55c7 in mongo::Lock::DBLock::DBLock(mongo::Locker*, mongo::StringData const&amp;amp;, mongo::LockMode) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#4  0x0000000000c9dc9b in ?? ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#5  0x0000000000c9c477 in ?? ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#6  0x0000000000c9c737 in mongo::repl::logOp(mongo::OperationContext*, char const*, char const*, mongo::BSONObj const&amp;amp;, mongo::BSONObj*, bool*, bool) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#7  0x00000000009bcd5f in mongo::WriteBatchExecutor::execOneInsert(mongo::WriteBatchExecutor::ExecInsertsState*, mongo::WriteErrorDetail**) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#8  0x00000000009bd9dd in mongo::WriteBatchExecutor::execInserts(mongo::BatchedCommandRequest const&amp;amp;, mongo::WriteConcernOptions const&amp;amp;, std::vector&amp;lt;mongo::WriteErrorDetail*, std::allocator&amp;lt;mongo::WriteErrorDetail*&amp;gt; &amp;gt;*) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#9  0x00000000009bf959 in mongo::WriteBatchExecutor::bulkExecute(mongo::BatchedCommandRequest const&amp;amp;, mongo::WriteConcernOptions const&amp;amp;, std::vector&amp;lt;mongo::BatchedUpsertDetail*, std::allocator&amp;lt;mongo::BatchedUpsertDetail*&amp;gt; &amp;gt;*, std::vector&amp;lt;mongo::WriteErr&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;orDetail*, std::allocator&amp;lt;mongo::WriteErrorDetail*&amp;gt; &amp;gt;*) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#10 0x00000000009c0185 in mongo::WriteBatchExecutor::executeBatch(mongo::BatchedCommandRequest const&amp;amp;, mongo::BatchedCommandResponse*) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#11 0x00000000009c2e6c in mongo::WriteCmd::run(mongo::OperationContext*, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; const&amp;amp;, mongo::BSONObj&amp;amp;, int, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt;&amp;amp;, mongo:&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:BSONObjBuilder&amp;amp;, bool) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#12 0x00000000009e5e81 in mongo::_execCommand(mongo::OperationContext*, mongo::Command*, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; const&amp;amp;, mongo::BSONObj&amp;amp;, int, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;char&amp;gt; &amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#13 0x00000000009e6e9c in mongo::Command::execCommand(mongo::OperationContext*, mongo::Command*, int, char const*, mongo::BSONObj&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) ()&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#14 0x00000000009e7b6b in mongo::_runCommands(mongo::OperationContext*, char const*, mongo::BSONObj&amp;amp;, mongo::_BufBuilder&amp;lt;mongo::TrivialAllocator&amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool, int) ()&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#15 0x0000000000bfebcb in mongo::runQuery(mongo::OperationContext*, mongo::Message&amp;amp;, mongo::QueryMessage&amp;amp;, mongo::NamespaceString const&amp;amp;, mongo::CurOp&amp;amp;, mongo::Message&amp;amp;) ()&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#16 0x0000000000ad0752 in mongo::assembleResponse(mongo::OperationContext*, mongo::Message&amp;amp;, mongo::DbResponse&amp;amp;, mongo::HostAndPort const&amp;amp;) ()&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#17 0x0000000000809935 in mongo::MyMessageHandler::process(mongo::Message&amp;amp;, mongo::AbstractMessagingPort*, mongo::LastError*) ()&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#18 0x0000000000f93a19 in mongo::PortMessageServer::handleIncomingMsg(void*) ()&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#19 0x000000327fe07851 in start_thread () from /lib64/libpthread.so.0&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Thread2 (holds the local DB lock and waits on a ticket):&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Thread 417 (Thread 0x7efc8b96d700 (LWP 23525)):&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#0  0x000000327fe0d720 in sem_wait () from /lib64/libpthread.so.0&lt;/span&gt;&lt;/pre&gt;
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		&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;#1  0x0000000000f75b24 in mongo::TicketHolder::waitForTicket() ()&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;#2  0x0000000000def990 in mongo::WiredTigerRecoveryUnit::_getTicket(mongo::OperationContext*) ()&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;#3  0x00000000009bcbff in mongo::WriteBatchExecutor::execOneInsert(mongo::WriteBatchExecutor::ExecInsertsState*, mongo::WriteErrorDetail**) ()&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;#4  0x00000000009bd9dd in mongo::WriteBatchExecutor::execInserts(mongo::BatchedCommandRequest const&amp;amp;, mongo::WriteConcernOptions const&amp;amp;, std::vector&amp;lt;mongo::WriteErrorDetail*, std::allocator&amp;lt;mongo::WriteErrorDetail*&amp;gt; &amp;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;#5  0x00000000009bf959 in mongo::WriteBatchExecutor::bulkExecute(mongo::BatchedCommandRequest const&amp;amp;, mongo::WriteConcernOptions const&amp;amp;, std::vector&amp;lt;mongo::BatchedUpsertDetail*, std::allocator&amp;lt;mongo::BatchedUpsertDetail*&amp;gt; &amp;gt;*, std::vector&amp;lt;mongo::WriteErr&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;orDetail*, std::allocator&amp;lt;mongo::WriteErrorDetail*&amp;gt; &amp;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;#6  0x00000000009c0185 in mongo::WriteBatchExecutor::executeBatch(mongo::BatchedCommandRequest const&amp;amp;, mongo::BatchedCommandResponse*) ()&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;#7  0x00000000009c2e6c in mongo::WriteCmd::run(mongo::OperationContext*, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; const&amp;amp;, mongo::BSONObj&amp;amp;, int, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt;&amp;amp;, mongo:&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;:BSONObjBuilder&amp;amp;, bool) ()&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;#8  0x00000000009e5e81 in mongo::_execCommand(mongo::OperationContext*, mongo::Command*, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; const&amp;amp;, mongo::BSONObj&amp;amp;, int, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;&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;char&amp;gt; &amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) ()&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;#9  0x00000000009e6e9c in mongo::Command::execCommand(mongo::OperationContext*, mongo::Command*, int, char const*, mongo::BSONObj&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) ()&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;#10 0x00000000009e7b6b in mongo::_runCommands(mongo::OperationContext*, char const*, mongo::BSONObj&amp;amp;, mongo::_BufBuilder&amp;lt;mongo::TrivialAllocator&amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool, int) ()&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;#11 0x0000000000bfebcb in mongo::runQuery(mongo::OperationContext*, mongo::Message&amp;amp;, mongo::QueryMessage&amp;amp;, mongo::NamespaceString const&amp;amp;, mongo::CurOp&amp;amp;, mongo::Message&amp;amp;) ()&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;#12 0x0000000000ad0752 in mongo::assembleResponse(mongo::OperationContext*, mongo::Message&amp;amp;, mongo::DbResponse&amp;amp;, mongo::HostAndPort const&amp;amp;) ()&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;#13 0x0000000000809935 in mongo::MyMessageHandler::process(mongo::Message&amp;amp;, mongo::AbstractMessagingPort*, mongo::LastError*) ()&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;#14 0x0000000000f93a19 in mongo::PortMessageServer::handleIncomingMsg(void*) ()&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;#15 0x000000327fe07851 in start_thread () from /lib64/libpthread.so.0&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;Thread3 (blocked behind Thread1, because it acquires the database lock in S mode):&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 1383 (Thread 0x7f0d432ed700 (LWP 54124)):&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;#0  0x000000327fe0b7bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.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;#1  0x00000000009cbe38 in mongo::CondVarLockGrantNotification::wait(unsigned int) ()&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;#2  0x00000000009d3133 in mongo::LockerImpl&amp;lt;false&amp;gt;::lockComplete(mongo::ResourceId, mongo::LockMode, unsigned int, bool) ()&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;#3  0x00000000009c55c7 in mongo::Lock::DBLock::DBLock(mongo::Locker*, mongo::StringData const&amp;amp;, mongo::LockMode) ()&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;#4  0x0000000000935681 in mongo::AutoGetDb::AutoGetDb(mongo::OperationContext*, mongo::StringData const&amp;amp;, mongo::LockMode) ()&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;#5  0x00000000009ea511 in mongo::DBStats::run(mongo::OperationContext*, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; const&amp;amp;, mongo::BSONObj&amp;amp;, int, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) ()&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;#6  0x00000000009e5e81 in mongo::_execCommand(mongo::OperationContext*, mongo::Command*, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; const&amp;amp;, mongo::BSONObj&amp;amp;, int, std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) ()&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;#7  0x00000000009e6e9c in mongo::Command::execCommand(mongo::OperationContext*, mongo::Command*, int, char const*, mongo::BSONObj&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool) ()&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;#8  0x00000000009e7b6b in mongo::_runCommands(mongo::OperationContext*, char const*, mongo::BSONObj&amp;amp;, mongo::_BufBuilder&amp;lt;mongo::TrivialAllocator&amp;gt;&amp;amp;, mongo::BSONObjBuilder&amp;amp;, bool, int) ()&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;#9  0x0000000000bfebcb in mongo::runQuery(mongo::OperationContext*, mongo::Message&amp;amp;, mongo::QueryMessage&amp;amp;, mongo::NamespaceString const&amp;amp;, mongo::CurOp&amp;amp;, mongo::Message&amp;amp;) ()&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;#10 0x0000000000ad0752 in mongo::assembleResponse(mongo::OperationContext*, mongo::Message&amp;amp;, mongo::DbResponse&amp;amp;, mongo::HostAndPort const&amp;amp;) ()&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;#11 0x0000000000809935 in mongo::MyMessageHandler::process(mongo::Message&amp;amp;, mongo::AbstractMessagingPort*, mongo::LastError*) ()&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;#12 0x0000000000f93a19 in mongo::PortMessageServer::handleIncomingMsg(void*) ()&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;#13 0x000000327fe07851 in start_thread () from /lib64/libpthread.so.0&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="245022">SERVER-22011</key>
            <summary>Direct writes to the local database can cause deadlock involving the WiredTiger write throttle</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>code-and-test</label>
                    </labels>
                <created>Wed, 23 Dec 2015 21:03:09 +0000</created>
                <updated>Wed, 4 Jan 2017 01:41:40 +0000</updated>
                            <resolved>Mon, 1 Feb 2016 20:43:48 +0000</resolved>
                                    <version>3.0.8</version>
                    <version>3.2.0</version>
                                    <fixVersion>3.2.3</fixVersion>
                    <fixVersion>3.3.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>20</watches>
                                                                                                                <comments>
                            <comment id="1468812" author="yjhjstz" created="Wed, 4 Jan 2017 01:41:40 +0000"  >&lt;p&gt;@Thomas Schubert , Thanks. I try some load testing on workloadc&#65292;the result shows 128 was right chosen&#12290;&lt;/p&gt;</comment>
                            <comment id="1468631" author="thomas.schubert" created="Tue, 3 Jan 2017 21:31:10 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yjhjstz&quot; class=&quot;user-hover&quot; rel=&quot;yjhjstz&quot;&gt;yjhjstz&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;128 was chosen as the default WT write throttle during load testing and is meant to serve as a conservative &quot;backstop&quot; to prevent the engine from being overwhelmed. By &quot;conservative&quot;, I mean that it is unlikely to hurt users with beefy machines. In our testing, we continue to see that these values provide significant benefit for certain workloads.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1464639" author="yjhjstz" created="Fri, 23 Dec 2016 08:15:14 +0000"  >&lt;p&gt;why the default value for the WT write throttle is 128 ?&lt;/p&gt;</comment>
                            <comment id="1183865" author="ramon.fernandez" created="Wed, 24 Feb 2016 23:38:21 +0000"  >&lt;p&gt;The fix for the v3.0 branch needs more investigation, so it won&apos;t make it into 3.0.10 &amp;#8211; pushing it to a later release.&lt;/p&gt;</comment>
                            <comment id="1161744" author="xgen-internal-githook" created="Tue, 2 Feb 2016 22:19:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22011&quot; title=&quot;Direct writes to the local database can cause deadlock involving the WiredTiger write throttle&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22011&quot;&gt;&lt;del&gt;SERVER-22011&lt;/del&gt;&lt;/a&gt;: Obtain tickets at outermost global lock in WT&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 2969c83e3dcd4ca26e81b27454938e1c2aa7fe53)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9e55fe2085f8627ae7791b8a4b55e0c6114feac3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9e55fe2085f8627ae7791b8a4b55e0c6114feac3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1160041" author="xgen-internal-githook" created="Mon, 1 Feb 2016 19:48:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22011&quot; title=&quot;Direct writes to the local database can cause deadlock involving the WiredTiger write throttle&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22011&quot;&gt;&lt;del&gt;SERVER-22011&lt;/del&gt;&lt;/a&gt;: Obtain tickets at outermost global lock in WT&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2969c83e3dcd4ca26e81b27454938e1c2aa7fe53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2969c83e3dcd4ca26e81b27454938e1c2aa7fe53&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1121775" author="dan@10gen.com" created="Wed, 23 Dec 2015 21:29:52 +0000"  >&lt;p&gt;Simple repro:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;mongod --replSet dan --setParameter wiredTigerConcurrentWriteTransactions=1&lt;/li&gt;
	&lt;li&gt;loop of writes to a capped collection in test db&lt;/li&gt;
	&lt;li&gt;loop of writes to a capped collection in local db&lt;/li&gt;
	&lt;li&gt;use local; while(1) 
{printjson(db.stats());sleep(1);}&lt;/li&gt;
&lt;/ol&gt;
</comment>
                    </comments>
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