Fix correctness, sanity check, and resolve shutdown issue. #2203

Job	Run time
macOS [UBSAN] [lmdb \| clang]	25m 26s
Linux [UBSAN] [lmdb \| clang]	39m 47s
macOS [ASAN] [lmdb \| clang]	31m 34s
Linux [ASAN] [lmdb \| clang]	38m 55s
macOS [TSAN] [lmdb \| clang]	32m 39s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	40m 27s
macOS [UBSAN] [rocksdb \| clang]	24m 16s
Linux [TSAN] [lmdb \| clang]	38m 4s
macOS [ASAN] [rocksdb \| clang]	40m 27s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 46s
macOS [TSAN] [rocksdb \| clang]	54m 26s
Linux [UBSAN] [rocksdb \| clang]	51m 22s
Linux [ASAN] [rocksdb \| clang]	56m 23s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	55m 1s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	57m 43s
	10h 26m 16s

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