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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-73290] WiredTiger hits limits of TSAN deadlock detector</title>
                <link>https://jira.mongodb.org/browse/SERVER-73290</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In stress tests, WiredTiger will occassionally cause TSAN to fail with the following error because a thread is holding more than 64 mutexes at once:&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;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;FATAL: ThreadSanitizer CHECK failed: /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector.h:67 &quot;((n_all_locks_)) &amp;lt; (((sizeof(all_locks_with_contexts_)/sizeof((all_locks_with_contexts_)[0]))))&quot; (0x40, 0x40)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     #0 __tsan::TsanCheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cpp:47:25 (mongod+0xe9056)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     #1 __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/sanitizer_common/sanitizer_termination.cpp:78:5 (mongod+0x68c1f)&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 __sanitizer::DeadlockDetectorTLS&amp;lt;__sanitizer::TwoLevelBitVector&amp;lt;1ul, __sanitizer::BasicBitVector&amp;lt;unsigned long&amp;gt; &amp;gt; &amp;gt;::addLock(unsigned long, unsigned long, unsigned int) /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector.h:67:5 (mongod+0x5cc36)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     #3 onLockAfter /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector.h:216:11 (mongod+0x5c188)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     #4 __sanitizer::DD::MutexAfterLock(__sanitizer::DDCallback*, __sanitizer::DDMutex*, bool, bool) /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector1.cpp:169:6 (mongod+0x5c188)&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 __tsan::MutexPostLock(__tsan::ThreadState*, unsigned long, unsigned long, unsigned int, int) /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/tsan/rtl/tsan_rtl_mutex.cpp:199:14 (mongod+0xe73a6)&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 pthread_mutex_lock /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/tsan/../sanitizer_common/sanitizer_common_interceptors.inc:4239:5 (mongod+0x9e9f8)&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 __wt_spin_lock /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/include/mutex_inline.h:171:16 (libwiredtiger.so+0x107884)&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 __split_ref_prepare /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/btree/bt_split.c:366:9 (libwiredtiger.so+0x107884)&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 __split_root /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/btree/bt_split.c:509:5 (libwiredtiger.so+0x101a07)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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 __split_parent_climb /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/btree/bt_split.c:1330:19 (libwiredtiger.so+0x101a07)&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 __split_multi_lock /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/btree/bt_split.c:2173:13 (libwiredtiger.so+0xffca5)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     #12 __wt_split_multi /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/btree/bt_split.c:2191:5 (libwiredtiger.so+0xffca5)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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 __evict_page_dirty_update /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/evict/evict_page.c:445:13 (libwiredtiger.so+0x1c3696)&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;     #14 __wt_evict /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/evict/evict_page.c:226:9 (libwiredtiger.so+0x1c3696)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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 __evict_page /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/evict/evict_lru.c:2331:5 (libwiredtiger.so+0x1bfd1e)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;     #16 __evict_lru_pages /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/evict/evict_lru.c:1144:20 (libwiredtiger.so+0x1bd3ca)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     #17 __wt_evict_thread_run /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/evict/evict_lru.c:320:9 (libwiredtiger.so+0x1b8fdb)&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;     #18 __thread_run /data/mci/efa7a03527f42318eaf9b7f0563fa22b/src/src/third_party/wiredtiger/src/support/thread_group.c:31:9 (libwiredtiger.so+0x2c2668)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;     #19 __tsan_thread_start_func /data/mci/4c5523d6b930f0c1f82f5452d6add3b6/toolchain-builder/tmp/build-llvm-v4.sh-FAX/llvm-project-llvmorg/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp:955:15 (mongod+0x80aac)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     #20 start_thread &amp;lt;null&amp;gt; (libpthread.so.0+0x82dd)&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;   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;     #21 clone &amp;lt;null&amp;gt; (libc.so.6+0xfca62)&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;We investigated this failure and concluded that it was not a bug in WiredTiger. This is expected WiredTiger behavior in __split_ref_prepare where we need to lock the references to all child pages that get moved to a new page during a page split. This problem is only reproducible in instrumented tests which intentionally generate load and cause excessive page splits. This is an assertion in TSAN itself, not an actual deadlock.&lt;/p&gt;

&lt;p&gt;The issue is that this assertion is not suppressible using a TSAN suppression like &quot;deadlock:path/to/file&quot; to target specific code as we do already for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4017f1973070f9f0065f2e29353b7b6dc8991c1e/etc/tsan.suppressions#L20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;data races&lt;/a&gt;. The only way to avoid this failure is to entirely disable the deadlock detector across the codebase, which is not what we want. &lt;/p&gt;

&lt;p&gt;I filed &lt;a href=&quot;https://github.com/google/sanitizers/issues/1611&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this issue&lt;/a&gt; to track the problem with the sanitizer. We can either continue to run less stressful tests without TSAN, or we can wait on the outcome of the ticket I filed to see if the maintainers would be willing to support higher mutex depths.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2242816">SERVER-73290</key>
            <summary>WiredTiger hits limits of TSAN deadlock detector</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>code-analysis</label>
                    </labels>
                <created>Wed, 25 Jan 2023 10:34:14 +0000</created>
                <updated>Fri, 2 Feb 2024 20:56:23 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2162441">SERVER-70695</issuekey>
        </issuelink>
                            </inwardlinks>
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