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os: TestPipeEOF failures with "timed out waiting for read" #36107

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bcmills opened this issue Dec 12, 2019 · 7 comments
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os: TestPipeEOF failures with "timed out waiting for read" #36107

bcmills opened this issue Dec 12, 2019 · 7 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done. Testing An issue that has been verified to require only test changes, not just a test failure.
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Go1.21

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bcmills commented Dec 12, 2019 •
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#!watchflakes
post <- pkg == "os" && test == "TestPipeEOF" && `timed out waiting for read`

2019-12-12T13:32:03-c39cd41/darwin-amd64-10_14:

--- FAIL: TestPipeEOF (1.08s)
    pipe_test.go:378: line 0
    pipe_test.go:378: line 1
    pipe_test.go:378: line 2
    pipe_test.go:386: timed out waiting for read
FAIL
FAIL	os	2.452s

See previously #35275, which had a very similar failure mode but with an additional file already closed message at the end.

This is the only failure I could find after CL 204800.

CC @ianlancetaylor
@bcmills bcmills added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Dec 12, 2019
@bcmills bcmills added this to the Backlog milestone Dec 12, 2019
@bcmills bcmills mentioned this issue Feb 19, 2021
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@bcmills bcmills changed the title os: TestPipeEOF failure on darwin-amd64-10_14 builder os: TestPipeEOF failures with "timed out waiting for read" Feb 19, 2021
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bcmills commented Feb 19, 2021

2020-08-17T14:50:17-7ee2622/solaris-amd64-oraclerel
2020-06-18T20:58:26-a07e281/solaris-amd64-oraclerel
2020-02-07T18:06:58-ff091b5/solaris-amd64-oraclerel

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bcmills commented Dec 10, 2021

A more thorough history, including a failure in 2021:

greplogs --dashboard -md -l -e 'FAIL: TestPipeEOF .*\n(?: .*\n)* .*: timed out waiting for read'

2021-03-25T19:24:25-569c86d/darwin-amd64-10_14
2020-08-17T14:50:17-7ee2622/solaris-amd64-oraclerel
2020-06-18T20:58:26-a07e281/solaris-amd64-oraclerel
2020-02-07T18:06:58-ff091b5/solaris-amd64-oraclerel
2019-12-12T13:32:03-c39cd41/darwin-amd64-10_14
2019-11-04T10:13:30-1b2ff10/aix-ppc64
2019-11-02T21:51:09-61fa798/aix-ppc64
2019-11-01T00:04:51-4a09a9b/aix-ppc64
2019-10-31T21:47:51-15bff20/windows-amd64-2016
2019-10-31T16:02:25-d5caea7/aix-ppc64

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bcmills commented Dec 13, 2022

This test has an arbitrary short timeout:
https://cs.opensource.google/go/go/+/master:src/os/pipe_test.go;l=400;drc=9839668b5619f45e293dd40339bf0ac614ea6bee

It also has several moderately long (10ms) sleeps, whose purpose isn't obvious:
https://cs.opensource.google/go/go/+/master:src/os/pipe_test.go;l=368;drc=9839668b5619f45e293dd40339bf0ac614ea6bee

@bcmills bcmills added Testing An issue that has been verified to require only test changes, not just a test failure. NeedsFix The path to resolution is known, but the work has not been done. labels Dec 13, 2022
@gopherbot gopherbot removed the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Dec 13, 2022
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The sleeps come straight from the test case in #24164. I expect it could be written better.

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Change https://go.dev/cl/457336 mentions this issue: os: deflake TestPipeEOF

@bcmills bcmills self-assigned this Dec 13, 2022
@bcmills bcmills modified the milestones: Backlog, Go1.21 Dec 13, 2022
@bcmills bcmills mentioned this issue Dec 15, 2022
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Change https://go.dev/cl/458015 mentions this issue: os: clean up tests

gopherbot pushed a commit that referenced this issue Jan 19, 2023
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os: clean up tests
e49cb02 
- Use testenv.Command instead of exec.Command to try to get more
  useful timeout behavior.

- Parallelize tests that appear not to require global state.
  (And add explanatory comments for a few that are not
  parallelizable for subtle reasons.)

- Consolidate some “Helper” tests with their parent tests.

- Use t.TempDir instead of os.MkdirTemp when appropriate.

- Factor out subtests for repeated test helpers.

For #36107.
Updates #22315.

Change-Id: Ic24b6957094dcd40908a59f48e44c8993729222b
Reviewed-on: https://go-review.googlesource.com/c/go/+/458015
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
@bcmills bcmills mentioned this issue Sep 19, 2023
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