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bcmills opened this issue Nov 4, 2021 · 17 comments
Open

net: TestCloseWrite failures with "i/o timeout" on darwin/arm64 #49352

bcmills opened this issue Nov 4, 2021 · 17 comments
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arch-arm64 NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Darwin
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Go1.25

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@bcmills
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bcmills commented Nov 4, 2021 •
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#!watchflakes
post <- goos ~ `darwin|ios` && goarch == "arm64" && pkg == "net" && test == "TestCloseWrite"

greplogs --dashboard -md -l -e '(?m)FAIL: TestCloseWrite/.*\n(\s+.*\n)*.*i/o timeout'

2021-11-03T21:45:33-d3f5dd5/darwin-arm64-11_0-toothrot
2020-10-20T17:52:41-90c924f/ios-arm64-corellium
2020-09-28T21:30:01-af18bce/linux-mips64le-mengzhuo
2020-09-07T02:46:24-1a119ed/darwin-arm64-corellium
2020-08-26T16:15:32-6382809/darwin-arm64-corellium
2020-08-18T15:50:52-b58d297/darwin-arm64-corellium
2020-05-01T19:55:48-30f8074/darwin-arm64-corellium
2020-04-13T21:56:15-1b15c7f/darwin-arm64-corellium

See previously #34837.
@bcmills bcmills added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Nov 4, 2021
@bcmills bcmills added this to the Backlog milestone Nov 4, 2021
@bcmills
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bcmills commented Jun 15, 2022

Still ongoing (but rare) on darwin/arm64.

greplogs -l -e '(?m)FAIL: TestCloseWrite/.*\n(\s+.*\n)*.*i/o timeout' --since=2021-11-04
2022-06-14T21:55:52-cb9bf93/darwin-arm64-11
2021-11-05T00:52:09-bd580a0/darwin-arm64-11_0-toothrot

(attn @neild, @ianlancetaylor)

@neild
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neild commented Jun 15, 2022

I wonder if this is a variation on #37795?

@neild
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neild commented Jun 15, 2022

The mips64le failure above has "too many open files" in the log, and is likely unrelated. I'll bet this is the same macOS bug as #37795. If it is, a similar workaround might work--add a small delay so that we don't close (or CloseWrite) a socket while reading from it.

@bcmills
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bcmills commented Jun 15, 2022

Seems worth a shot, at least! (We can always try it, and reopen the issue if it turns out not to be the right workaround.)

@gopherbot
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Change https://go.dev/cl/414534 mentions this issue: net: avoid darwin/arm64 platform bug in TestCloseWrite

@bcmills
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bcmills commented Jun 27, 2022 •
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Sent https://go.dev/cl/414534 with a port of the workaround from #37795, prompted by another failure on the dashboard.

greplogs -l -e '(?m)FAIL: TestCloseWrite/.*\n(\s+.*\n)*.*i/o timeout' --since=2022-06-15
2022-06-26T00:21:33-666d736/darwin-arm64-12

@dmitshur dmitshur added NeedsFix The path to resolution is known, but the work has not been done. and removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Jun 27, 2022
@dmitshur dmitshur modified the milestones: Backlog, Go1.19 Jun 27, 2022
@heschi
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heschi commented Jul 6, 2022

Unless I'm misunderstanding something, this recurred on 6/29: 2022-06-29T22:28:30-b2cc0fe/darwin-arm64-11

@heschi heschi reopened this Jul 6, 2022
@gopherbot gopherbot modified the milestones: Go1.19, Go1.20 Aug 2, 2022
jproberts pushed a commit to jproberts/go that referenced this issue Aug 10, 2022
@jproberts
net: avoid darwin/arm64 platform bug in TestCloseWrite
f691226 
On darwin_arm64, reading from a socket at the same time as the other
end is closing it will occasionally hang for 60 seconds before
returning ECONNRESET. (This is a macOS issue, not a Go issue.)

Work around this condition by adding a brief sleep before the read.

Fixes golang#49352 (we hope).
Updates golang#37795.

Change-Id: I4052aec21d311d7370550aea9dd7941f39141133
Reviewed-on: https://go-review.googlesource.com/c/go/+/414534
Run-TryBot: Bryan Mills <[email protected]>
Auto-Submit: Bryan Mills <[email protected]>
Reviewed-by: Damien Neil <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
@bcmills bcmills added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Jan 6, 2023
@bcmills bcmills mentioned this issue Jan 6, 2023
Closed
@gopherbot gopherbot removed the NeedsFix The path to resolution is known, but the work has not been done. label Jan 6, 2023
@bcmills bcmills changed the title net: TestCloseWrite failures with "i/o timeout" net: TestCloseWrite failures with "i/o timeout" on darwin/arm64 Jan 6, 2023
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bcmills commented Jan 6, 2023

watchflakes found another in #57589. Added a pattern for this issue.

@gopherbot gopherbot modified the milestones: Go1.20, Go1.21 Feb 1, 2023
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Found new dashboard test flakes for:

#!watchflakes
post <- goos ~ `darwin|ios` && goarch == "arm64" && pkg == "net" && test == "TestCloseWrite"
2023-02-10 17:30 darwin-arm64-12 go@f69dbb6d net.TestCloseWrite (log) 
--- FAIL: TestCloseWrite (0.00s)
    --- FAIL: TestCloseWrite/unix (159.80s)
        net_test.go:176: got (0, read unix ->/tmp/buildlet/tmp/4113395035/sock: i/o timeout); want (0, io.EOF)
        net_test.go:119: got (0, read unix /tmp/buildlet/tmp/4113395035/sock->: i/o timeout); want (0, io.EOF)

— watchflakes

@bcmills
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bcmills commented Feb 24, 2023

(Note that the above failure was on release-branch.go1.19.)

@neild
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neild commented Feb 24, 2023

If this is indeed #37795, then I believe we should stop seeing this on more recent Darwin versions. (macOS 13 and higher? Not sure which version has the fix.)

@gopherbot
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Found new dashboard test flakes for:

#!watchflakes
post <- goos ~ `darwin|ios` && goarch == "arm64" && pkg == "net" && test == "TestCloseWrite"
2023-05-16 19:46 darwin-arm64-12 go@b3d1cce3 net.TestCloseWrite (log) 
--- FAIL: TestCloseWrite (0.00s)
    --- FAIL: TestCloseWrite/tcp (159.74s)
        net_test.go:119: got (0, read tcp4 127.0.0.1:55818->127.0.0.1:55819: i/o timeout); want (0, io.EOF)
        net_test.go:176: got (0, read tcp 127.0.0.1:55819->127.0.0.1:55818: i/o timeout); want (0, io.EOF)

— watchflakes

@gopherbot
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Found new dashboard test flakes for:

#!watchflakes
post <- goos ~ `darwin|ios` && goarch == "arm64" && pkg == "net" && test == "TestCloseWrite"
2023-05-19 22:45 darwin-arm64-12 go@fe786638 net.TestCloseWrite (log) 
--- FAIL: TestCloseWrite (0.00s)
    --- FAIL: TestCloseWrite/unix (159.70s)
        net_test.go:176: got (0, read unix ->/tmp/buildlet/tmp/330333358/sock: i/o timeout); want (0, io.EOF)
        net_test.go:119: got (0, read unix /tmp/buildlet/tmp/330333358/sock->: i/o timeout); want (0, io.EOF)

— watchflakes

@gopherbot gopherbot modified the milestones: Go1.21, Go1.22 Aug 8, 2023
@gopherbot
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Found new dashboard test flakes for:

#!watchflakes
post <- goos ~ `darwin|ios` && goarch == "arm64" && pkg == "net" && test == "TestCloseWrite"
2023-10-13 17:10 darwin-arm64-12 go@6dd7462a net.TestCloseWrite (log) 
--- FAIL: TestCloseWrite (0.00s)
    --- FAIL: TestCloseWrite/tcp (159.96s)
        net_test.go:174: got (0, read tcp 127.0.0.1:54752->127.0.0.1:54750: i/o timeout); want (0, io.EOF)
        net_test.go:117: got (0, read tcp4 127.0.0.1:54750->127.0.0.1:54752: i/o timeout); want (0, io.EOF)

— watchflakes

@gopherbot gopherbot modified the milestones: Go1.22, Go1.23 Feb 6, 2024
@gopherbot
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Found new dashboard test flakes for:

#!watchflakes
post <- goos ~ `darwin|ios` && goarch == "arm64" && pkg == "net" && test == "TestCloseWrite"
2024-03-28 21:12 darwin-arm64-11 go@4edf4bb2 net.TestCloseWrite (log) 
--- FAIL: TestCloseWrite (0.00s)
    --- FAIL: TestCloseWrite/unix (159.49s)
        net_test.go:117: got (0, read unix /tmp/buildlet/tmp/1591061272/sock->: i/o timeout); want (0, io.EOF)
        net_test.go:174: got (0, read unix ->/tmp/buildlet/tmp/1591061272/sock: i/o timeout); want (0, io.EOF)

— watchflakes

@gopherbot
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Found new dashboard test flakes for:

#!watchflakes
post <- goos ~ `darwin|ios` && goarch == "arm64" && pkg == "net" && test == "TestCloseWrite"
2024-04-15 17:26 darwin-arm64-12 go@55e4097c net.TestCloseWrite (log) 
--- FAIL: TestCloseWrite (0.00s)
    --- FAIL: TestCloseWrite/unix (159.63s)
        net_test.go:174: got (0, read unix ->/tmp/buildlet/tmp/323781204/sock: i/o timeout); want (0, io.EOF)
        net_test.go:117: got (0, read unix /tmp/buildlet/tmp/323781204/sock->: i/o timeout); want (0, io.EOF)

— watchflakes

@gopherbot gopherbot modified the milestones: Go1.23, Go1.24 Aug 13, 2024
@gopherbot gopherbot modified the milestones: Go1.24, Go1.25 Feb 11, 2025
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Change https://go.dev/cl/671457 mentions this issue: net: avoid windows hand in TestCloseWrite

gopherbot pushed a commit that referenced this issue May 15, 2025
@qmuntal @gopherbot
net: avoid windows hang in TestCloseWrite
8105ea5 
On Windows, reading from a socket at the same time as the other
end is closing it will occasionally hang. This is a Windows issue, not
a Go issue, similar to what happens in macOS (see #49352).

Work around this condition by adding a brief sleep before the read.

Fixes #73140.

Change-Id: I24e457a577e507d0d69924af6ffa1aa24c4aaaa6
Reviewed-on: https://go-review.googlesource.com/c/go/+/671457
Reviewed-by: Michael Knyszek <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Alan Donovan <[email protected]>
Reviewed-by: Alan Donovan <[email protected]>
Commit-Queue: Alan Donovan <[email protected]>
Reviewed-by: Damien Neil <[email protected]>
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