Fix correctness, sanity check, and resolve shutdown issue. #2206

Job	Run time
Linux [UBSAN] [lmdb \| clang]	39m 20s
Linux [ASAN] [lmdb \| clang]	41m 54s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	39m 9s
macOS [UBSAN] [lmdb \| clang]	27m 28s
Linux [TSAN] [lmdb \| clang]	44m 27s
macOS [ASAN] [lmdb \| clang]	31m 8s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 47s
macOS [TSAN] [lmdb \| clang]	33m 8s
Linux [UBSAN] [rocksdb \| clang]	50m 20s
macOS [UBSAN] [rocksdb \| clang]	26m 59s
Linux [ASAN] [rocksdb \| clang]	55m 0s
macOS [ASAN] [rocksdb \| clang]	40m 46s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	56m 4s
macOS [TSAN] [rocksdb \| clang]	57m 11s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	57m 37s
	10h 40m 18s

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