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Some context: I'm trying to build Go 1.10 under slapos and get failures
like:

	ok   os      0.782s
	PASS
	testing: can't write /tmp/go-build511454695/b682/testlog.txt: write /tmp/go-build511454695/b682/testlog.txt: broken pipe
	FAIL os/exec 0.947s
	...
	ok   cmd/vet/internal/cfg    0.002s
	2018/04/03 18:13:29 Failed: exit status 1
	golang1.10: Command failed with exit code 1:   cd src && ls -l /proc/self/fd && ./all.bash && cp -alf .. /srv/slapgrid/slappart5/srv/runner/software/099a7368550e95d120639cb03b6d47c8/parts/golang1.10
	golang1.10: Compilation error. The package is left as is at /srv/slapgrid/slappart5/srv/runner/software/099a7368550e95d120639cb03b6d47c8/parts/golang1.10__compile__/go where you can inspect what went wrong
	While:
	  Installing golang1.10.
	Error: System error

This was traced to https://github.com/golang/go/issues/24285, which in turn was
traced by me to the fact that golang os/...