From commit f363c7a5f2 onwards, many (most?) unit tests have been consistently producing segfaults after the tests themselves have finished running, regardless of whether they fail or succeed. This has been observed both by myself on my Ubuntu 19.04 workstation, and by another member of my team on his Ubuntu 19.10 workstation. We are both building with --link-model=dynamic --opt=off.
Some examples below:
(mongo-python3) bernard@SEELE:~/mongo$ build/ninja/mongo/s/client/mongos_client_local_test
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2020-02-18T11:26:24.250+0000 I - [main] going to run suite: ShardLocalTest
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2020-02-18T11:26:24.251+0000 I - [main] going to run test: RunCommand
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...
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2020-02-18T11:26:24.307+0000 I - [main] SUCCESS - All tests in all suites passed
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Segmentation fault (core dumped)
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(mongo-python3) bernard@SEELE:~/mongo$ ninja -f build-mongo.ninja +document_source_change_stream_test
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[1/1 (100%) 5.025s] build/ninja/mongo/db/pipeline/db_pipeline_test -fileNameFilter document_source_change_stream_test
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FAILED: +document_source_change_stream_test
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build/ninja/mongo/db/pipeline/db_pipeline_test -fileNameFilter document_source_change_stream_test
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2020-02-18T11:27:41.675+0000 I - [main] going to run suite: AccumulatorMergeObjects
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2020-02-18T11:27:41.675+0000 I - [main] DONE running tests
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...
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2020-02-18T11:27:43.228+0000 I - [main] SUCCESS - All tests in all suites passed
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Segmentation fault (core dumped)
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ninja: build stopped: subcommand failed.
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(mongo-python3) bernard@SEELE:~/mongo$ build/ninja/mongo/s/catalog/s_catalog_test
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...
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2020-02-18T11:30:23.887+0000 I - [main] DistLockCatalogTest | tests: 78 | fails: 0 | assert calls: 0 | time secs: 0.706
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2020-02-18T11:30:23.887+0000 I - [main] InsertRetryTest | tests: 6 | fails: 0 | assert calls: 0 | time secs: 0.058
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2020-02-18T11:30:23.887+0000 I - [main] RSDistLockMgrWithMockTickSource | tests: 4 | fails: 0 | assert calls: 0 | time secs: 0.104
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2020-02-18T11:30:23.887+0000 I - [main] ReplSetDistLockManagerFixture | tests: 28 | fails: 0 | assert calls: 0 | time secs: 0.259
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2020-02-18T11:30:23.887+0000 I - [main] ShardingCatalogClientTest | tests: 36 | fails: 0 | assert calls: 0 | time secs: 0.196
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2020-02-18T11:30:23.887+0000 I - [main] UpdateRetryTest | tests: 6 | fails: 0 | assert calls: 0 | time secs: 0.031
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2020-02-18T11:30:23.887+0000 I - [main] TOTALS | tests: 158 | fails: 0 | assert calls: 0 | time secs: 1.354
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2020-02-18T11:30:23.887+0000 I - [main] SUCCESS - All tests in all suites passed
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Segmentation fault (core dumped)
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Bug
Major - P3
SERVER-45793 Improve mongo::Mutex contract