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net/http: TestServerEmptyBodyRace_h2 flakes with "connection reset by peer" #22540

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rsc opened this issue Nov 2, 2017 · 11 comments
Open

net/http: TestServerEmptyBodyRace_h2 flakes with "connection reset by peer" #22540

rsc opened this issue Nov 2, 2017 · 11 comments
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@rsc rsc commented Nov 2, 2017

I'm seeing lots of flaky tests in net/http. They all fail with a message like:

2017/11/02 00:10:29 Dialing 127.0.0.1:50066
2017/11/02 00:10:30 Dialing 127.0.0.1:50070
2017/11/02 00:10:30 Unsolicited response received on idle HTTP channel starting with "0\r\n\r\n"; err=<nil>

On my Mac just now:

2017/11/02 00:10:29 Dialing 127.0.0.1:50066
2017/11/02 00:10:30 Dialing 127.0.0.1:50070
2017/11/02 00:10:30 Unsolicited response received on idle HTTP channel starting with "0\r\n\r\n"; err=<nil>
--- FAIL: TestServerEmptyBodyRace_h2 (0.01s)
	serve_test.go:4157: Get https://127.0.0.1:50756: read tcp 127.0.0.1:50757->127.0.0.1:50756: read: connection reset by peer
	serve_test.go:4170: handler ran 19 times; want 20
FAIL
FAIL	net/http	5.178s

linux-386 build dashboard:

2017/11/02 03:56:34 Dialing 127.0.0.1:45529
2017/11/02 03:56:34 Dialing 127.0.0.1:41134
2017/11/02 03:56:34 Unsolicited response received on idle HTTP channel starting with "0\r\n\r\n"; err=<nil>
--- FAIL: TestCloseIdleConnections_h2 (0.22s)
	clientserver_test.go:1304: didn't close connection
FAIL
FAIL	net/http	3.058s

I had a trybot failure with this earlier this evening too.

Not sure what's going on.

Welcome back, @bradfitz!
@rsc rsc added this to the Go1.10 milestone Nov 2, 2017
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@bradfitz bradfitz commented Nov 2, 2017

@tombergan, does this ring any bells?
@bradfitz bradfitz added the NeedsFix label Nov 2, 2017
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@tombergan tombergan commented Nov 2, 2017

TestCloseIdleConnections_h2 is #22413.

I believe those "Dialing... Unsolicited response" messages are printed by tests that were running concurrently with the flakey tests. The "Unsolicited response" message is H1 while the flakey tests are H2. Further, I don't see those messages when I repro the second flake with go test -run TestCloseIdleConnections_h2 -count 100000 net/http.

I can't repro TestServerEmptyBodyRace_h2 on my linux workstation. It looks like Russ has filed an issue for that flake at least twice before, both times on a Mac and both times with the same error message: #18541 and #17713.
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@bradfitz bradfitz commented Nov 2, 2017

The "Dialing" log spam was introduced by f5cd386 for HTTPS proxy support (@bemasc). I'll send a CL for that first.
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@gopherbot gopherbot commented Nov 2, 2017

Change https://golang.org/cl/75531 mentions this issue: net/http: remove some log spam in test, add missing error detail
gopherbot pushed a commit that referenced this issue Nov 2, 2017
@bradfitz
net/http: remove some log spam in test, add missing error detail
ad3742f 
Updates #22540

Change-Id: I26e79c25652976fac6f2e5a7afb4fd1240996d74
Reviewed-on: https://go-review.googlesource.com/75531
Reviewed-by: Tom Bergan <tombergan@google.com>
Run-TryBot: Tom Bergan <tombergan@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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@bradfitz bradfitz commented Nov 2, 2017

More digging. The "Unsolicited" log spam was added by 2da8a16 (@benburkert), also recently.
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@bradfitz bradfitz commented Nov 2, 2017

... as part of TestNoBodyOnChunked304Response.
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@gopherbot gopherbot commented Nov 2, 2017

Change https://golang.org/cl/75593 mentions this issue: net/http: quiet some log spam in TestNoBodyOnChunked304Response
gopherbot pushed a commit that referenced this issue Nov 2, 2017
@bradfitz
net/http: quiet some log spam in TestNoBodyOnChunked304Response
a9a5806 
Updates #22540

Change-Id: I63e8c4874f8a774e9c47affc856aadf8c35ca23b
Reviewed-on: https://go-review.googlesource.com/75593
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tom Bergan <tombergan@google.com>
benburkert added a commit to heroku/go that referenced this issue Nov 14, 2017
@bradfitz @benburkert
net/http: quiet some log spam in TestNoBodyOnChunked304Response
Verified
This commit was signed with a verified signature.
benburkert Ben Burkert
GPG key ID: C7DFCE78F1045ED0 Learn about signing commits
eda2e5c 
Updates golang#22540

Change-Id: I63e8c4874f8a774e9c47affc856aadf8c35ca23b
Reviewed-on: https://go-review.googlesource.com/75593
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tom Bergan <tombergan@google.com>
@tombergan tombergan changed the title net/http: flaky "unsolicited response received on idle HTTP channel" HTTP/2 failures net/http: TestServerEmptyBodyRace_h2 flakes on Mac with "connection reset by peer" Nov 27, 2017
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@bradfitz bradfitz commented Jan 4, 2018

I was able to reproduce this on my Mac (10.13.2) with,

go test -short -count=3000 -run=TestServerEmptyBodyRace

and started to look into it, but when I ran that command again, it hung for a few seconds and then spewed out:

--- FAIL: TestServerEmptyBodyRace_h2 (0.11s)
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4150: Get https://127.0.0.1:64315: dial tcp 127.0.0.1:64315: connect: can't assign requested address
        serve_test.go:4163: handler ran 0 times; want 20
--- FAIL: TestServerEmptyBodyRace_h1 (0.11s)
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4150: Get http://127.0.0.1:64314: dial tcp 127.0.0.1:64314: connect: can't assign requested address
        serve_test.go:4163: handler ran 5 times; want 20
....

Does Darwin's TCP stack not recycle local port numbers as quickly as Linux, I guess? Do I need to wait 3 minutes or so before I'm allowed to run a test again?
@andybons andybons mentioned this issue Jan 24, 2018
Closed
benburkert added a commit to heroku/go that referenced this issue Jan 25, 2018
@bradfitz @benburkert
net/http: quiet some log spam in TestNoBodyOnChunked304Response
Verified
This commit was signed with a verified signature.
benburkert Ben Burkert
GPG key ID: C7DFCE78F1045ED0 Learn about signing commits
f1c801a 
Updates golang#22540

Change-Id: I63e8c4874f8a774e9c47affc856aadf8c35ca23b
Reviewed-on: https://go-review.googlesource.com/75593
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tom Bergan <tombergan@google.com>
@bradfitz bradfitz modified the milestones: Go1.10, Go1.11 Feb 14, 2018
@andybons andybons modified the milestones: Go1.11, Go1.11.1 Aug 25, 2018
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@fraenkel fraenkel commented Aug 25, 2018

When I run go test -short -count=3000 -run=TestServerEmptyBodyRace
There are 59289 connections in time-wait.
TestServerEmptyBodyRace_h1 creates 58737
TestServerEmptyBodyRace_h2 creates 172
@FiloSottile FiloSottile modified the milestones: Go1.11.1, Go1.12 Aug 31, 2018
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@mcauto mcauto commented Nov 27, 2018

Same here

Code

transport := &http.Transport{
		Dial: (&net.Dialer{
			Timeout: p.timeout,
		}).Dial,
		TLSHandshakeTimeout: p.timeout,
		IdleConnTimeout:     time.Second,
		TLSClientConfig:     &tls.Config{InsecureSkipVerify: true},
	}

	client := &http.Client{
		Transport: transport,
		Timeout:   p.timeout,
	}
        response, _ := client.Get(addr)

Result

2018/11/27 09:38:02 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil>
2018/11/27 09:38:02 Unsolicited response received on idle HTTP channel starting with "DY></HTML>\r\n\r\n"; err=<nil>
2018/11/27 09:38:02 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil>
2018/11/27 09:38:02 Unsolicited response received on idle HTTP channel starting with "\r\n"; err=<nil>

I use go version go1.9.4 linux/amd64
@andybons andybons modified the milestones: Go1.12, Go1.13 Feb 12, 2019
@andybons andybons modified the milestones: Go1.13, Go1.14 Jul 8, 2019
@bcmills bcmills mentioned this issue Aug 12, 2019
Open
@rsc rsc modified the milestones: Go1.14, Backlog Oct 9, 2019
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@bcmills bcmills commented Oct 21, 2019

Same failure mode on netbsd-amd64-8_0, but without the Unsolicited response messages:
https://build.golang.org/log/c005ed3a705dd49a49c1c529e7cc7491bd3a6728
@bcmills bcmills changed the title net/http: TestServerEmptyBodyRace_h2 flakes on Mac with "connection reset by peer" net/http: TestServerEmptyBodyRace_h2 flakes with "connection reset by peer" Oct 21, 2019
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@rsc @bradfitz @tombergan @gopherbot @fraenkel @mcauto @bcmills @andybons @FiloSottile
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