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net/http: TestCancelRequestWhenSharingConnection failures with nil err instead of Canceled #55226

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gopherbot opened this issue Sep 20, 2022 · 10 comments
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net/http: TestCancelRequestWhenSharingConnection failures with nil err instead of Canceled #55226

gopherbot opened this issue Sep 20, 2022 · 10 comments
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@gopherbot
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gopherbot commented Sep 20, 2022 •
edited by bcmills
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#!watchflakes
post <- pkg == "net/http" && test == "TestCancelRequestWhenSharingConnection" && `got err .*, want Canceled`

Bug automatically created to track these flakes.

— watchflakes
@gopherbot gopherbot added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Sep 20, 2022
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gopherbot commented Sep 20, 2022 •
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Found new matching flaky dashboard failures for:

#!watchflakes
post <- pkg == "net/http" && test == "TestCancelRequestWhenSharingConnection"
2022-09-03 18:21 windows-arm64-10 go@a0f05823 net/http.TestCancelRequestWhenSharingConnection (log) 
--- FAIL: TestCancelRequestWhenSharingConnection (0.00s)
    transport_test.go:6524: request 2: got err <nil>, want Canceled

— watchflakes

@gopherbot gopherbot changed the title net/http: flaky TestCancelRequestWhenSharingConnection net/http: TestCancelRequestWhenSharingConnection failures Sep 20, 2022
@rsc rsc moved this to Active in Test Flakes Sep 20, 2022
@bcmills
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bcmills commented Oct 26, 2022

https://storage.googleapis.com/go-build-log/1e6b7c4d/linux-amd64-unified_9f4321a1.log (a linux-amd64-unified TryBot on https://go.dev/cl/445596)

(attn @neild)

@bcmills bcmills mentioned this issue Oct 26, 2022
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@bcmills bcmills added this to the Backlog milestone Oct 26, 2022
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a trybot failed on https://go.dev/cl/414954 (linux-amd64-race)
https://storage.googleapis.com/go-build-log/c4a4d844/linux-amd64-race_f1e0101f.log

@ZekeLu ZekeLu mentioned this issue Oct 31, 2022
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@gopherbot
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Change https://go.dev/cl/446676 mentions this issue: net/http: deflake TestCancelRequestWhenSharingConnection

@bcmills
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bcmills commented Oct 31, 2022

https://storage.googleapis.com/go-build-log/20b2f437/windows-386-2012_09808bc8.log (windows-386-2012 TryBot)

Repository owner moved this from Active to Done in Test Flakes Oct 31, 2022
romaindoumenc pushed a commit to TroutSoftware/go that referenced this issue Nov 3, 2022
@ZekeLu @romaindoumenc
net/http: deflake TestCancelRequestWhenSharingConnection
f4ec08c 
The test sleeps for 1 millisecond to give the cancellation a moment
to take effect. This is flaky because the request can finish before
the cancellation of the context is seen. It's easy to verify by adding

    time.Sleep(2*time.Millisecond)

after https://github.com/golang/go/blob/0a6c4c87404ecb018faf002919e5d5db04c69ee2/src/net/http/transport.go#L2619.
With this modification, the test fails about 5 times out of 10 runs.

The fix is easy. We just need to block the handler of the second
request until this request is cancelled. I have verify that the
updated test can uncover the issue fixed by CL 257818.

Fixes golang#55226.

Change-Id: I81575beef1a920a2ffaa5c6a5ca70a4008bd5f94
GitHub-Last-Rev: 99cb1c2
GitHub-Pull-Request: golang#56500
Reviewed-on: https://go-review.googlesource.com/c/go/+/446676
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && test == "TestCancelRequestWhenSharingConnection"
2022-10-25 20:28 windows-amd64-race go@b95ea201 net/http.TestCancelRequestWhenSharingConnection (log) 
--- FAIL: TestCancelRequestWhenSharingConnection (0.00s)
    --- FAIL: TestCancelRequestWhenSharingConnection/h1 (0.01s)
        transport_test.go:6531: request 2: got err <nil>, want Canceled
2022/10/25 20:42:14 http: TLS handshake error from 127.0.0.1:50830: read tcp 127.0.0.1:50829->127.0.0.1:50830: i/o timeout
2022/10/25 20:42:14 http: TLS handshake error from 127.0.0.1:50886: read tcp 127.0.0.1:50868->127.0.0.1:50886: use of closed network connection
2022/10/25 20:42:14 http: TLS handshake error from 127.0.0.1:50878: read tcp 127.0.0.1:50868->127.0.0.1:50878: use of closed network connection
2022/10/25 20:42:14 http2: server: error reading preface from client 127.0.0.1:50919: bogus greeting "CONNECT golang.fake.tld:"
2022/10/25 20:42:14 http2: server: error reading preface from client 127.0.0.1:50921: bogus greeting "CONNECT golang.fake.tld:"
2022/10/25 20:42:16 http: TLS handshake error from 127.0.0.1:51158: EOF
2022/10/25 20:42:16 http: TLS handshake error from 127.0.0.1:51160: EOF
2022/10/25 20:42:18 http: TLS handshake error from 127.0.0.1:51591: read tcp 127.0.0.1:51589->127.0.0.1:51591: wsarecv: An existing connection was forcibly closed by the remote host.
2022/10/25 20:42:18 http: TLS handshake error from 127.0.0.1:51594: read tcp 127.0.0.1:51592->127.0.0.1:51594: wsarecv: An established connection was aborted by the software in your host machine.
2022-10-28 23:35 linux-amd64-race go@b726b0ca net/http.TestCancelRequestWhenSharingConnection (log) 
--- FAIL: TestCancelRequestWhenSharingConnection (0.00s)
    --- FAIL: TestCancelRequestWhenSharingConnection/h1 (0.01s)
        transport_test.go:6531: request 2: got err <nil>, want Canceled
2022/10/28 23:46:30 http: TLS handshake error from 127.0.0.1:42824: write tcp 127.0.0.1:34363->127.0.0.1:42824: use of closed network connection
2022/10/28 23:46:30 http: TLS handshake error from 127.0.0.1:47998: write tcp 127.0.0.1:46017->127.0.0.1:47998: i/o timeout
2022/10/28 23:46:30 http: TLS handshake error from 127.0.0.1:55276: write tcp 127.0.0.1:44997->127.0.0.1:55276: i/o timeout
2022/10/28 23:46:30 http2: server: error reading preface from client 127.0.0.1:56470: bogus greeting "CONNECT golang.fake.tld:"
2022/10/28 23:46:30 http2: server: error reading preface from client 127.0.0.1:59580: bogus greeting "CONNECT golang.fake.tld:"
2022/10/28 23:46:31 http: TLS handshake error from 127.0.0.1:58690: EOF
2022/10/28 23:46:31 http: TLS handshake error from 127.0.0.1:38948: EOF
2022/10/28 23:46:32 http: TLS handshake error from 127.0.0.1:55176: read tcp 127.0.0.1:37285->127.0.0.1:55176: read: connection reset by peer

— watchflakes

@gopherbot gopherbot reopened this Nov 4, 2022
@bcmills bcmills mentioned this issue Nov 4, 2022
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@ZekeLu
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ZekeLu commented Nov 6, 2022

2022-10-25 20:28 windows-amd64-race go@b95ea201 net/http.TestCancelRequestWhenSharingConnection (log)
2022-10-28 23:35 linux-amd64-race go@b726b0ca net/http.TestCancelRequestWhenSharingConnection (log)

These two failures happened before e943dc5 was landed on 2022-11-01. So they are not new.

The root cause of this issue is that the second request finishes before the context cancellation is seen. While the root cause of #56587 is that the first request does not finish. I think it is not a duplicate of this one, and it's better to close this one and reopen that one.

@bcmills
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bcmills commented Nov 8, 2022

I think it is not a duplicate of this one, and it's better to close this one and reopen that one.

If they have different causes and/or symptoms, then I agree they should be tracked as separate issues, but if that's the case then the issue titles and watchflakes patterns should be updated to distinguish the two. (I don't think I have enough context to update them appropriately, but I suspect that you do — if you can suggest updated patterns I can edit the issues accordingly.)

@ZekeLu
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ZekeLu commented Nov 9, 2022

I have commented #56587 with the suggested watchflakes patterns.

@bcmills bcmills changed the title net/http: TestCancelRequestWhenSharingConnection failures net/http: TestCancelRequestWhenSharingConnection failures with nil err instead of Canceled Nov 9, 2022
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bcmills commented Nov 9, 2022

Re-closing as probably fixed by CL 446676, since the watchflakes failures still all predate that change.

@bcmills bcmills closed this as completed Nov 9, 2022
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net/http: deflake TestCancelRequestWhenSharingConnection ZekeLu/go
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