Fix correctness, sanity check, and resolve shutdown issue. #2210

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 9s
macOS [UBSAN] [lmdb \| clang]	2h 4m 58s
Linux [ASAN] [lmdb \| clang]	38m 28s
macOS [ASAN] [lmdb \| clang]	30m 15s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	42m 53s
macOS [TSAN] [lmdb \| clang]	32m 32s
Linux [TSAN] [lmdb \| clang]	42m 8s
macOS [UBSAN] [rocksdb \| clang]	32m 12s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 24s
macOS [ASAN] [rocksdb \| clang]	41m 20s
Linux [UBSAN] [rocksdb \| clang]	50m 6s
macOS [TSAN] [rocksdb \| clang]	55m 45s
Linux [ASAN] [rocksdb \| clang]	54m 12s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	57m 34s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	55m 26s
	12h 16m 22s

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