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net: TestLookupDotsWithRemoteSource is flaky #27992

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katiehockman opened this issue Oct 3, 2018 · 10 comments
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@katiehockman katiehockman commented Oct 3, 2018

We are getting flaky test failures in net. This has been somewhat rare in the past few months, but it has failed the last 5 builds, so probably worth looking into now.

--- FAIL: TestLookupDotsWithRemoteSource (15.57s)
    lookup_test.go:694: LookupSRV(xmpp-server, tcp, google.com): lookup _xmpp-server._tcp.google.com on 8.8.8.8:53: read udp 10.50.0.170:50511->8.8.8.8:53: i/o timeout (mode=go)
FAIL
FAIL	net	30.123s

Looks very related to #16865 closed 2 years ago.
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@katiehockman katiehockman commented Oct 3, 2018

/cc @mikioh @brad-burch @ianlancetaylor
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@ianlancetaylor ianlancetaylor commented Oct 3, 2018

2018-06-13T18:06:14-537fb06/darwin-amd64-10_10
2018-06-13T18:06:14-537fb06/darwin-amd64-10_11
2018-06-26T16:40:09-8997ec1/darwin-amd64-10_10
2018-06-26T16:40:09-8997ec1/darwin-amd64-10_11
2018-06-26T16:40:09-8997ec1/darwin-amd64-race
2018-07-03T16:14:43-2ee6bfb/darwin-amd64-10_10
2018-07-03T16:14:43-2ee6bfb/darwin-amd64-10_12
2018-07-03T16:27:51-aad71d3/darwin-amd64-10_12
2018-07-03T17:37:40-5d4f047/darwin-386-10_11
2018-07-03T17:37:40-5d4f047/darwin-amd64-10_10
2018-07-03T17:37:40-5d4f047/darwin-amd64-10_11
2018-07-09T22:19:21-94076fe/darwin-amd64-10_10
2018-07-11T01:08:56-5e70b13/darwin-amd64-race
2018-07-27T16:29:52-b39fb9e/darwin-amd64-10_10
2018-08-17T15:34:50-876c6d1/darwin-386-10_11
2018-08-17T15:34:50-876c6d1/darwin-amd64-10_10
2018-08-17T15:34:50-876c6d1/darwin-amd64-10_11
2018-08-21T04:39:22-80fe2e6/darwin-amd64-race
2018-08-21T04:50:21-2a5df06/darwin-386-10_11
2018-08-21T04:55:04-187a41d/darwin-amd64-10_10
2018-08-21T04:55:04-187a41d/darwin-amd64-10_11
2018-08-21T14:08:12-e8daca4/darwin-amd64-10_10
2018-08-22T22:11:24-ccb70bd/darwin-386-10_11
2018-08-24T23:02:01-aacc891/darwin-amd64-10_10
2018-08-24T23:02:31-523dc5a/darwin-amd64-10_10
2018-08-30T19:36:15-a2a8396/darwin-amd64-10_10
2018-08-30T19:36:15-a2a8396/darwin-amd64-race
2018-10-03T15:01:47-c96e3bc/darwin-amd64-10_10
2018-10-03T19:52:49-cbafcc5/darwin-amd64-10_10
2018-10-03T19:54:16-9a8372f/darwin-amd64-10_10
2018-10-03T19:54:29-c91ce3c/darwin-386-10_11
2018-10-03T19:54:29-c91ce3c/darwin-amd64-10_10
2018-10-03T19:54:29-c91ce3c/darwin-amd64-race
2018-10-03T20:13:35-112f28d/darwin-amd64-10_10
@ianlancetaylor ianlancetaylor added this to the Go1.12 milestone Oct 3, 2018
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@ianlancetaylor ianlancetaylor commented Oct 3, 2018

Any chance there was a recent change to whether the builders set GO_BUILDER_FLAKY_NET in the environment? Because the test does not fail in that way if that environment variable is set.
@katiehockman katiehockman changed the title net: Flaky test failing in darwin-amd64-10_10 net: flaky test failing in darwin-amd64-10_10 Oct 3, 2018
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@mikioh mikioh commented Oct 3, 2018

Once http://golang.org/cl/102875 lands, I will smash the use of external DNS speakers such as rsc.io or some public full resolver then flaky tests disappear. For now, I have no spare time to debug the circumstances running the tests, also not sure there's a way to sneak in the (protected) circumstances.
@bradfitz bradfitz mentioned this issue Oct 4, 2018
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@andybons andybons commented Nov 28, 2018

@mikioh should we just disable this test until 1.13?
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@mikioh mikioh commented Nov 29, 2018

Yes, please. Will try to allocate my spare time for Go 1.13 devel cycle.
@andybons andybons self-assigned this Nov 29, 2018
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@gopherbot gopherbot commented Nov 29, 2018

Change https://golang.org/cl/151799 mentions this issue: net: skip flaky TestLookupDotsWithRemoteSource for now
gopherbot pushed a commit that referenced this issue Nov 30, 2018
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net: skip flaky TestLookupDotsWithRemoteSource on darwin
9081229 
Updates #27992

Change-Id: Ic327df7cc5002a3d537f9117559c25f30e1eab9c
Reviewed-on: https://go-review.googlesource.com/c/151799
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@andybons andybons commented Nov 30, 2018

@mikioh done. Assigning back to you. Thanks.
@andybons andybons assigned mikioh and unassigned andybons Nov 30, 2018
@andybons andybons modified the milestones: Go1.12, Go1.13 Nov 30, 2018
@mikioh mikioh removed their assignment Dec 4, 2018
@bcmills bcmills changed the title net: flaky test failing in darwin-amd64-10_10 net: TestLookupDotsWithRemoteSource is flaky May 15, 2019
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@bcmills bcmills commented May 15, 2019

Here's the same failure mode on dragonfly-amd64: https://build.golang.org/log/2f33b64e758b0fb89431e34f51f80580e5b56e59

--- FAIL: TestLookupDotsWithRemoteSource (10.85s)
    lookup_test.go:669: LookupCNAME(www.mit.edu, mode=go): lookup www.mit.edu on 192.168.1.100:53: read udp 192.168.1.2:54367->192.168.1.100:53: i/o timeout
FAIL
FAIL	net	68.224s
@bcmills bcmills added the NeedsFix label May 15, 2019
@andybons andybons modified the milestones: Go1.13, Go1.14 Jul 8, 2019
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@bcmills bcmills commented Aug 20, 2019

freebsd-arm-paulzhol (https://build.golang.org/log/daa40802f66a0d79d4d356d551c94456f56785b1):

--- FAIL: TestLookupDotsWithRemoteSource (12.52s)
    lookup_test.go:656: LookupAddr(8.8.8.8): lookup 8.8.8.8.in-addr.arpa. on 192.168.1.253:53: read udp 192.168.1.101:38233->192.168.1.253:53: i/o timeout (mode=go)
FAIL
FAIL	net	44.919s
@bcmills bcmills removed the OS-Darwin label Aug 20, 2019
@rsc rsc removed this from the Go1.14 milestone Oct 9, 2019
@rsc rsc added this to the Backlog milestone Oct 9, 2019
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