Fix correctness, sanity check, and resolve shutdown issue. #2208

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 21s
Linux [ASAN] [lmdb \| clang]	38m 43s
macOS [UBSAN] [lmdb \| clang]	24m 43s
macOS [ASAN] [lmdb \| clang]	32m 20s
macOS [TSAN] [lmdb \| clang]	33m 6s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	39m 51s
macOS [UBSAN] [rocksdb \| clang]	27m 45s
Linux [TSAN] [lmdb \| clang]	39m 55s
macOS [ASAN] [rocksdb \| clang]	41m 1s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 38s
macOS [TSAN] [rocksdb \| clang]	1h 1m 1s
Linux [UBSAN] [rocksdb \| clang]	52m 42s
Linux [ASAN] [rocksdb \| clang]	58m 30s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	55m 5s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	58m 0s
	10h 41m 41s

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