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Fix runtime data races, memory leak, and shutdown safety #789

Job	Run time
macOS (native)	1m 51s
Linux (x64-linux)	4m 55s
Android (arm64-v8a API 23 cross-compile)	2m 28s
iOS (arm64-ios cross-compile)	1m 42s
Windows (x64-windows-static)	3m 28s
	14m 24s