Fix multi-user file locking #756

Job	Run time
linux-s390x (s390x-unknown-linux-gnu, s390x)	14m 13s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 54s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 31s
linux (x86_64-unknown-linux-gnu)	8m 43s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 35s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	10m 19s
linux (i686-unknown-linux-gnu)	10m 25s
linux-arm (arm-unknown-linux-musleabihf, arm)	9m 46s
macos-aarch64	13m 54s
macos-x86_64	8m 55s
musllinux (x86_64-unknown-linux-musl)	10m 46s
sdist	9m 23s
musllinux (i686-unknown-linux-musl)	9m 28s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	11m 26s
windows (x86_64-pc-windows-msvc, x64)	14m 47s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	10m 17s
windows (i686-pc-windows-msvc, x86)	13m 43s
	3h 8m 5s

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