https://evergreen.mongodb.com/task/mongodb_mongo_master_ubuntu1804_debug_aubsan_lite_unittests_f825465df95a1e663f65c149b2fe6412778372eb_20_09_02_03_18_47/0 was a case where the hang analyzer didn't attach to the db_unittests process. I believe this is due to "_test" being expected in the name for C++ unit test binaries. db_unittests doesn't follow that pattern.
[2020/09/02 06:23:54.553] Found 6 interesting processes [Pinfo(name='python', pidv=[112179, 112216]), Pinfo(name='python3', pidv=[992, 1345, 77793, 85627])]
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[2020/09/02 06:23:25.913] ubuntu 112216 0.2 0.1 1426148 91488 ? Sl 04:19 0:16 python buildscripts/resmoke.py run --suites=unittests --jobs=5 --shuffle --continueOnFailure --storageEngineCacheSizeGB=1 --log=buildlogger --staggerJobs=on --installDir=dist-test/bin --buildId=mongodb_mongo_master_ubuntu1804_debug_aubsan_lite_f825465df95a1e663f65c149b2fe6412778372eb_20_09_02_03_18_47 --distroId=ubuntu1804-large --executionNumber=0 --projectName=mongodb-mongo-master --gitRevision=f825465df95a1e663f65c149b2fe6412778372eb --revisionOrderId=34077 --taskId=mongodb_mongo_master_ubuntu1804_debug_aubsan_lite_unittests_f825465df95a1e663f65c149b2fe6412778372eb_20_09_02_03_18_47 --taskName=unittests --variantName=ubuntu1804-debug-aubsan-lite --versionId=mongodb_mongo_master_f825465df95a1e663f65c149b2fe6412778372eb --reportFile=report.json --perfReportFile=perf.json
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[2020/09/02 06:23:25.913] ubuntu 125375 0.9 1.6 21475766348 1110092 ? S 04:20 1:10 build/install/bin/db_unittests
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Bug
Major - P3
SERVER-42948 rename db_test to something better
SERVER-51692 Lint C++ unit test binary name to end with _test