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This race was reported in

As best as I can tell, it is another instance of #38370. The deferred
call to backend.close() ought to be enough to ensure that the t.Logf
happens before the end of the test, but in practice it is not, and
with enough scheduling delay we can manage to trip the race detector
on a call to Logf after the test function has returned.

Updates #38370.

Change-Id: I5ee45df45c6bfad3239d665df65a138f1c4573a3
LUCI-TryBot-Result: Go LUCI <>
Auto-Submit: Bryan Mills <>
Reviewed-by: Damien Neil <>


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