x/tools/internal/lsp: TestDebouncer is flaky

[bcmills]

2021-03-16T19:06:39-9e9211a/freebsd-amd64-11_2
2021-02-15T12:39:31-123adc8/darwin-amd64-10_12
2021-01-28T15:26:31-f871472/freebsd-386-12_0
2021-01-22T17:08:14-cf1022a/freebsd-386-11_2
2021-01-14T06:03:00-1bdb73f/freebsd-386-11_2
2020-12-11T18:50:31-d93e913/freebsd-386-11_2
2020-12-06T23:03:34-368bee8/freebsd-amd64-12_0
2020-12-03T16:35:28-2ecf2a5/dragonfly-amd64-5_8
2020-11-19T05:40:27-25dc3e1/plan9-amd64-9front
2020-11-10T12:42:07-079ba7b/netbsd-arm64-bsiegert
2020-11-04T18:37:02-aefe0b7/freebsd-arm64-dmgk
2020-11-03T23:54:15-b653051/netbsd-arm64-bsiegert
2020-10-30T19:58:41-f239dba/dragonfly-amd64
2020-10-30T19:34:16-deb1282/netbsd-386-9_0
2020-10-30T17:45:15-8da1a62/netbsd-amd64-9_0
2020-10-30T16:06:39-589136c/freebsd-amd64-12_0
2020-10-30T14:18:16-63f8a17/netbsd-386-9_0
2020-10-29T22:52:41-186a743/netbsd-386-9_0
2020-10-29T19:59:06-061905c/freebsd-386-12_0
2020-10-29T19:59:06-061905c/freebsd-amd64-12_0
2020-10-29T19:53:23-c86e623/freebsd-amd64-race
2020-10-29T13:53:53-690a3c2/freebsd-amd64-11_2
2020-10-28T22:47:54-2c11599/darwin-amd64-10_15
2020-10-28T22:47:54-2c11599/dragonfly-amd64
2020-10-28T22:47:54-2c11599/freebsd-amd64-12_0
2020-10-28T21:55:01-2b84a06/linux-ppc64le-buildlet
2020-10-28T18:20:00-5bbba66/freebsd-arm64-dmgk
2020-10-28T17:12:10-dc70f74/netbsd-386-9_0
2020-10-28T14:18:08-0dcbe36/freebsd-amd64-12_0
2020-10-28T14:18:08-0dcbe36/netbsd-amd64-9_0
2020-10-28T11:10:35-eafbe7b/freebsd-arm64-dmgk
2020-10-28T11:10:35-eafbe7b/netbsd-amd64-9_0
2020-10-27T23:31:11-0b86805/netbsd-amd64-9_0
2020-10-27T23:31:11-0b86805/openbsd-amd64-64
2020-10-23T17:41:41-c8cfbd0/netbsd-amd64-9_0
2020-10-23T15:00:57-2f4fa18/netbsd-386-9_0
2020-10-22T21:58:48-ffe8bce/darwin-amd64-10_14
2020-10-22T21:58:48-ffe8bce/netbsd-386-9_0
2020-10-22T03:59:29-9cf592e/openbsd-386-62
2020-10-21T21:49:18-23787c0/dragonfly-amd64
2020-10-21T17:08:55-2cbe144/freebsd-386-11_2
2020-10-21T16:55:45-eb9088f/freebsd-arm64-dmgk
2020-10-21T16:55:45-eb9088f/netbsd-amd64-9_0
2020-10-17T00:14:24-6003fad/dragonfly-amd64-5_8
2020-10-17T00:14:24-6003fad/solaris-amd64-oraclerel
2020-10-16T23:51:31-a03874c/freebsd-arm64-dmgk
2020-10-16T23:51:31-a03874c/netbsd-arm-bsiegert
2020-10-16T15:57:21-7c89c52/dragonfly-amd64-5_8
2020-10-16T15:57:21-7c89c52/netbsd-amd64-9_0
2020-10-16T15:57:21-7c89c52/windows-386-2008
2020-10-15T18:20:29-a5d9e45/freebsd-arm64-dmgk
2020-10-15T18:20:29-a5d9e45/netbsd-386-9_0
2020-10-13T20:10:25-64a9e34/windows-amd64-longtest
2020-10-13T16:52:01-8c26973/darwin-amd64-10_12
2020-10-12T19:26:20-5bd0538/windows-amd64-longtest
2020-10-11T14:58:50-ed2f502/darwin-amd64-10_14
2020-10-09T16:22:40-fcf8212/darwin-amd64-10_15
2020-10-09T01:09:51-9ab7e51/freebsd-amd64-12_0
2020-10-08T18:49:44-d01b322/netbsd-386-9_0
2020-10-07T03:26:33-0806396/netbsd-386-9_0
2020-10-07T03:26:33-0806396/netbsd-amd64-9_0
2020-10-07T01:32:53-d5f20aa/windows-amd64-2016
2020-10-05T18:50:03-576e169/darwin-amd64-nocgo
2020-10-05T18:50:03-576e169/netbsd-386-9_0
2020-10-05T18:50:03-576e169/windows-amd64-2016
2020-10-05T18:35:59-9854aba/darwin-amd64-10_14
2020-10-02T17:38:50-7e5cd54/dragonfly-amd64-5_8
2020-10-02T16:18:17-08f1973/freebsd-arm64-dmgk
2020-10-02T14:15:43-2268388/dragonfly-amd64

CC @stamblerre @findleyr

[findleyr]

Thanks. Interesting that it is mostly limited to BSD.

This test relies on timing to sequence goroutines, so is susceptible to this type of flake. I hadn't noticed that it was flaking, thanks for pulling the data.

I'll fix it properly.

[findleyr]

Ah, I forgot a bit of history here.

I did notice that this test was flaking, and increased a timeout in https://golang.org/cl/266698. That's why it's not actually that frequent from November on.

But it's still flaking sometimes.

[gopherbot]

Change https://golang.org/cl/309276 mentions this issue: internal/lsp: avoid flake in TestDebouncer