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tailscale/net/netcheck
History
Andrew Dunham 4cb1bfee44 net/netcheck: improve determinism in hairpinning test 
If multiple Go channels have a value (or are closed), receiving from
them all in a select will nondeterministically return one of the two
arms. In this case, it's possible that the hairpin check timer will have
expired between when we start checking and before we check at all, but
the hairpin packet has already been received. In such cases, we'd
nondeterministically set report.HairPinning.

Instead, check if we have a value in our results channel first, then
select on the value and timeout channel after. Also, add a test that
catches this particular failure.

Fixes #1795

Change-Id: I842ab0bd38d66fabc6cabf2c2c1bb9bd32febf35
Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
 		1 year ago
..
netcheck.go net/netcheck: improve determinism in hairpinning test 1 year ago
netcheck_test.go net/netcheck: improve determinism in hairpinning test 1 year ago