Fix correctness, sanity check, and resolve shutdown issue. #2204

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 22s
Linux [ASAN] [lmdb \| clang]	42m 2s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	40m 53s
macOS [UBSAN] [lmdb \| clang]	30m 40s
Linux [TSAN] [lmdb \| clang]	40m 6s
macOS [ASAN] [lmdb \| clang]	30m 13s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	38m 50s
macOS [TSAN] [lmdb \| clang]	28m 23s
Linux [UBSAN] [rocksdb \| clang]	49m 39s
macOS [UBSAN] [rocksdb \| clang]	20m 27s
Linux [ASAN] [rocksdb \| clang]	55m 6s
macOS [ASAN] [rocksdb \| clang]	42m 41s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	56m 18s
macOS [TSAN] [rocksdb \| clang]	58m 13s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	54m 58s
	10h 27m 51s

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