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x/build: frequent "communication error to buildlet" failures on plan9-amd64-0intro #49756

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bcmills opened this issue Nov 23, 2021 · 9 comments
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Builders x/build issues (builders, bots, dashboards) NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Plan9
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@bcmills
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bcmills commented Nov 23, 2021

greplogs --dashboard -md -l -e 'communication error to buildlet' --since=2021-11-01

2021-11-22T23:51:43-83bfed9/plan9-amd64-0intro
2021-11-22T23:09:35-9678f79/plan9-amd64-0intro
2021-11-22T20:34:40-f13fcd9/plan9-amd64-0intro
2021-11-22T16:53:57-cd0bf38/plan9-arm
2021-11-22T04:27:29-e30ebaa/plan9-amd64-0intro
2021-11-20T00:32:49-57aba32/plan9-386-0intro
2021-11-19T21:59:14-5e774b0/plan9-amd64-0intro
2021-11-19T21:41:33-ba9f0f6/plan9-amd64-0intro
2021-11-18T16:18:50-feb330d/plan9-amd64-0intro
2021-11-17T19:51:32-9a33945/plan9-amd64-0intro
2021-11-17T19:51:32-9a33945/plan9-arm
2021-11-17T19:18:24-aa34ea2/plan9-amd64-0intro
2021-11-17T19:18:24-aa34ea2/plan9-arm
2021-11-17T18:14:23-9bdbed1/plan9-arm
2021-11-16T14:02:36-bddb79f/plan9-arm
2021-11-12T18:10:48-0c6a6cd/plan9-arm
2021-11-10T21:32:50-f410786/plan9-arm
2021-11-10T17:15:54-8a3be15/plan9-arm
2021-11-09T20:08:48-f48115c/plan9-arm
2021-11-07T04:57:22-9e6ad46/plan9-amd64-0intro
2021-11-05T21:13:38-091948a/plan9-arm
2021-11-05T17:46:27-4f543b5/plan9-arm
2021-11-05T17:39:43-0bc98b3/plan9-arm
2021-11-05T17:23:06-37951d8/plan9-arm
2021-11-05T16:35:00-f249fa2/plan9-arm
2021-11-04T18:22:03-b2149ac/plan9-386-0intro
2021-11-04T18:22:03-b2149ac/plan9-amd64-0intro
2021-11-04T17:07:48-5772877/plan9-amd64-0intro
2021-11-04T14:54:46-00d6d20/plan9-amd64-0intro
2021-11-04T14:17:18-901bf29/plan9-arm
2021-11-04T07:05:31-2622235/plan9-amd64-0intro
2021-11-04T02:57:53-2cf85b1/plan9-amd64-0intro
2021-11-04T02:57:48-5fd0c49/plan9-amd64-0intro
2021-11-04T00:15:18-be0cd9e/plan9-arm
2021-11-02T03:54:24-3c61cb3/plan9-arm
2021-11-01T22:55:50-02e5913/plan9-arm
2021-11-01T15:55:20-d2b5121/plan9-arm

CC @millerresearch @0intro

@golang/release, what provokes this error message in the coordinator? (Is this a failing keepalive of some sort?)

@bcmills bcmills added Builders x/build issues (builders, bots, dashboards) OS-Plan9 labels Nov 23, 2021
@bcmills bcmills added this to the Unreleased milestone Nov 23, 2021
@dmitshur
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dmitshur commented Nov 23, 2021

This looks relevant to:

// If a build fails multiple times due to communication
// problems with the buildlet, assume something's wrong with
// the buildlet or machine and fail the build, rather than
// looping forever. This promotes the err (communication
// error) to a remoteErr (an error that occurred remotely and
// is terminal).
if rerr := st.repeatedCommunicationError(err); rerr != nil {
	remoteErr = rerr
	err = nil
	doneMsg = "communication error to buildlet (promoted to terminal error): " + rerr.Error()
	fmt.Fprintf(st, "\n%s\n", doneMsg)
}

The current implementation of repeatedCommunicationError is implemented only for Plan 9, and doesn't allow for any retries yet:

// For now, only do this for plan9, which is flaky (Issue 31261)
if strings.HasPrefix(st.Name, "plan9-") && execErr == errBuildletsGone {
	// TODO: give it two tries at least later (store state
	// somewhere; global map?). But for now we're going to
	// only give it one try.
	return fmt.Errorf("network error promoted to terminal error: %v", execErr)
}

So this is related to issues #31261 and #13026.

@millerresearch
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millerresearch commented Nov 23, 2021

When I observe this on the plan9-arm builders, it's because the builder machine has crashed or rebooted for some reason unrelated to the go tests (eg power flicker, file server disk full). I often use the retrybuilds utility to clear and restart the failed build, and it's fine.

@heschi heschi added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Nov 24, 2021
@bcmills
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bcmills commented Dec 9, 2021

The rate of these for the plan9-arm builder seems to have gone down over the past couple of weeks, but the plan9-amd64-0intro builder appears to be particularly unreliable.

@0intro, could you please investigate?

greplogs --dashboard -md -l -e 'communication error to buildlet' --since=2021-11-24

2021-12-08T23:38:20-d6c4583/plan9-amd64-0intro
2021-12-08T23:00:01-f5ddd94/plan9-amd64-0intro
2021-12-08T21:21:44-9e29dd4/plan9-amd64-0intro
2021-12-08T18:30:00-61011de/plan9-amd64-0intro
2021-12-08T18:06:06-7b7efd7/plan9-amd64-0intro
2021-12-08T17:55:13-c1c303f/plan9-amd64-0intro
2021-12-08T17:48:45-85a8e17/plan9-amd64-0intro
2021-12-08T17:34:34-6b60911/plan9-amd64-0intro
2021-12-08T17:24:46-ac7e950/plan9-amd64-0intro
2021-12-08T17:04:27-c759ec2/plan9-amd64-0intro
2021-12-08T16:50:04-f5b5939/plan9-amd64-0intro
2021-12-08T15:45:29-46db6aa/plan9-amd64-0intro
2021-12-08T15:34:19-3042ba3/plan9-amd64-0intro
2021-12-08T15:15:40-08025a9/plan9-amd64-0intro
2021-12-08T04:14:00-a19e72c/plan9-amd64-0intro
2021-12-08T01:23:09-016e6eb/plan9-amd64-0intro
2021-12-08T01:17:33-34573ae/plan9-amd64-0intro
2021-12-07T22:33:39-0a15e78/plan9-amd64-0intro
2021-12-07T22:33:33-a3ae45e/plan9-amd64-0intro
2021-12-07T21:31:42-dc50d69/plan9-amd64-0intro
2021-12-07T21:16:00-daf9018/plan9-386-0intro
2021-12-07T21:16:00-daf9018/plan9-amd64-0intro
2021-12-07T21:15:51-2ebe081/plan9-amd64-0intro
2021-12-07T02:31:12-e07b02f/plan9-amd64-0intro
2021-12-04T01:07:28-fa88ba1/plan9-386-0intro
2021-12-03T18:27:20-c4a8550/plan9-amd64-0intro
2021-12-03T18:09:19-deb988a/plan9-amd64-0intro
2021-11-30T18:09:02-931d80e/plan9-amd64-0intro
2021-11-29T19:24:34-68da368/plan9-arm
2021-11-27T23:29:50-0fa53e4/plan9-amd64-0intro
2021-11-27T23:27:52-9f2a075/plan9-386-0intro
2021-11-27T19:49:32-a142d65/plan9-amd64-0intro
2021-11-27T01:14:21-fad67f8/plan9-amd64-0intro
2021-11-26T22:36:21-1d47a11/plan9-amd64-0intro

@0intro
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0intro commented Dec 9, 2021

I've recently reworked the plan9-386 and plan9-amd64 builders so they reboot automatically after running the tests.
This should prevent the builders from remaining stuck in case of failure.

I'll investigate the issues with the plan9-amd64 builder.

@bcmills
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bcmills commented Jan 5, 2022

@0intro, any progress on the plan9-amd64 builder? It is currently showing completely broken on the build dashboard.

greplogs --dashboard -md -l -e 'communication error to buildlet' --since=2021-12-10

2022-01-03T23:45:12-95b240b/plan9-amd64-0intro
2022-01-03T23:45:06-a893d0f/plan9-amd64-0intro
2022-01-02T14:27:43-c886143/plan9-amd64-0intro
2022-01-02T14:27:32-d181885/plan9-amd64-0intro
2021-12-29T20:20:32-6178d25/plan9-amd64-0intro
2021-12-29T19:23:11-8a306e2/plan9-amd64-0intro
2021-12-29T04:10:07-91e7821/plan9-amd64-0intro
2021-12-29T01:44:55-a78532a/plan9-amd64-0intro
2021-12-23T20:03:38-b357b05/plan9-amd64-0intro
2021-12-23T19:58:13-0e4b878/plan9-amd64-0intro
2021-12-23T18:58:36-af3b8cf/plan9-amd64-0intro
2021-12-23T17:27:50-ed766b6/plan9-amd64-0intro
2021-12-22T23:31:40-d2ce939/plan9-amd64-0intro
2021-12-22T20:47:09-8cfcee1/plan9-amd64-0intro
2021-12-22T18:43:55-0f3becf/plan9-amd64-0intro
2021-12-22T18:38:41-d7b035f/plan9-amd64-0intro
2021-12-22T00:11:21-90fb5a4/plan9-amd64-0intro
2021-12-21T23:09:59-ebac50e/plan9-amd64-0intro
2021-12-21T22:43:13-3fb17cf/plan9-amd64-0intro
2021-12-21T22:26:48-60f2c12/plan9-amd64-0intro
2021-12-21T19:17:52-a1ce550/plan9-amd64-0intro
2021-12-21T18:43:00-9502339/plan9-amd64-0intro
2021-12-21T03:55:43-2d1d548/plan9-amd64-0intro
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2021-12-21T01:10:17-e087949/plan9-amd64-0intro
2021-12-20T23:46:23-1555062/plan9-amd64-0intro
2021-12-20T23:02:08-59d04d1/plan9-amd64-0intro
2021-12-19T20:16:45-87b2a54/plan9-amd64-0intro
2021-12-17T16:05:31-c5fee93/plan9-amd64-0intro
2021-12-17T03:59:09-5299390/plan9-amd64-0intro
2021-12-17T03:28:06-3c49583/plan9-amd64-0intro
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2021-12-15T20:26:19-07ed86c/plan9-amd64-0intro
2021-12-15T20:26:19-07ed86c/plan9-arm
2021-12-15T20:26:10-4cda05d/plan9-amd64-0intro
2021-12-15T20:26:03-bc0aba9/plan9-amd64-0intro
2021-12-15T20:19:05-83fc097/plan9-amd64-0intro
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@bcmills bcmills changed the title x/build: frequent "communication error to buildlet" failures on all plan9 builders x/build: frequent "communication error to buildlet" failures on plan9-amd64-0intro Jan 27, 2022
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bcmills commented Jan 27, 2022

Still ongoing — essentially every run for plan9-amd64-0intro for the main Go repo.

greplogs --dashboard -md -l -e 'communication error to buildlet' --since=2022-01-06

2022-01-27T05:30:27-a991d9d/plan9-amd64-0intro
2022-01-27T00:03:31-f4aa021/plan9-amd64-0intro
2022-01-26T23:43:39-db48840/plan9-amd64-0intro
2022-01-26T22:33:26-ef0b09c/plan9-amd64-0intro
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@0intro
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0intro commented Jan 28, 2022

The plan9-amd64 builder was running out of memory while executing GOMAXPROCS=2 go test runtime -cpu=1,2,4 -quick.
I think it should be better now.

@bcmills Thank you for your time tracking the various Plan 9 issues. It's very appreciated.

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gopherbot commented May 26, 2022

Change https://go.dev/cl/408698 mentions this issue: dashboard: add known issues for plan9-386, plan9-386-0intro, and plan9-amd64-0intro

gopherbot pushed a commit to golang/build that referenced this issue May 26, 2022
…9-amd64-0intro

For golang/go#52653.
Updates golang/go#29801.
Updates golang/go#49756.
Updates golang/go#50137.

Change-Id: Ided04da5c1e403c4a194c8c645c5179534a00907
Reviewed-on: https://go-review.googlesource.com/c/build/+/408698
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Alex Rakoczy <alex@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
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bcmills commented Jun 28, 2022

Still ongoing as of last month, but possibly improved for this builder in June?

greplogs --dashboard -md -l -e '(?ms)\Aplan9-amd64.*communication error to buildlet' --since=2022-05-01
2022-05-24T17:02:34-70668a4/plan9-amd64-0intro
2022-05-19T21:32:46-dd83fd8/plan9-amd64-0intro
2022-05-17T20:05:58-13147f7/plan9-amd64-0intro
2022-05-08T17:28:26-1b86ef4/plan9-amd64-0intro

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