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bcmills opened this issue Jun 15, 2021 · 7 comments
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x/net/http2: TestContentEncodingNoSniffing failures with "connection reset by peer" #46762

bcmills opened this issue Jun 15, 2021 · 7 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Linux release-blocker Testing An issue that has been verified to require only test changes, not just a test failure.
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Go1.18

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@bcmills
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bcmills commented Jun 15, 2021

2021-06-14T18:27:18-04defd4/linux-ppc64le-buildlet
2021-04-05T18:03:19-a5a99cb/linux-ppc64-buildlet
2021-03-31T06:09:03-cb1fcc7/linux-ppc64le-power9osu
2021-03-29T18:18:59-df645c7/linux-ppc64le-buildlet

CC @neild @tombergan @laboger

It's not clear to me whether this is a flaky Go test or a platform bug.
@bcmills bcmills added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. arch-ppc64x labels Jun 15, 2021
@bcmills bcmills added this to the Backlog milestone Jun 15, 2021
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bcmills commented Jan 21, 2022 •
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Turns out not to be specific to PPC64, so this is looking like a flaky test or x/net/http2 bug rather than a platform bug.

--- FAIL: TestContentEncodingNoSniffing (0.05s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: Failed to fetch URL: write tcp 127.0.0.1:56032->127.0.0.1:34169: write: connection reset by peer
FAIL
FAIL	golang.org/x/net/http2	18.129s

greplogs --dashboard -md -l -e 'FAIL: TestContentEncodingNoSniffing .*\n( .*\n)* .*: connection reset by peer' --since=2021-06-16

2022-01-21T00:39:55-0dd24b2-32636cd/linux-amd64-clang
2021-11-03T00:07:38-4a448f8-49a0063/linux-386-clang
2021-09-03T01:38:54-8d99171-9f69a44/linux-arm64-aws

@bcmills bcmills changed the title x/net/http2: TestContentEncodingNoSniffing failures with "connection reset by peer" on linux-ppc64le x/net/http2: TestContentEncodingNoSniffing failures with "connection reset by peer" Jan 21, 2022
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bcmills commented Jan 21, 2022

These failures do not appear to be specific to a single subtest.

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bcmills commented Jan 21, 2022

The subtests of this test share a single Transport, but tear down and set up a new serverTester for each subtest.

@neild, could that cause this failure mode if two of the serverTester instances happen to pick the same port?

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bcmills commented Jan 21, 2022

Setting -httptest.serve to explicitly reuse the same port seems to increase the failure rate substantially.

~/x/net$ go test ./http2 -run=TestContentEncodingNoSniffing -httptest.serve=127.0.0.1:0 -count=10000 -timeout=1h
ok      golang.org/x/net/http2  429.798s

~/x/net$ go test ./http2 -run=TestContentEncodingNoSniffing -httptest.serve=127.0.0.1:8080 -count=10000 -timeout=1h
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:55808->127.0.0.1:8080: write: connection reset by peer
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:55810->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: unexpected EOF
--- FAIL: TestContentEncodingNoSniffing (0.05s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:56964->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:40744->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:40750->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:46014->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.05s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:46036->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:46090->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.05s)
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: unexpected EOF
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:56912->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:35440->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: unexpected EOF
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:40690->127.0.0.1:8080: write: connection reset by peer
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:40692->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: unexpected EOF
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45978->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.05s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45982->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.02s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45990->127.0.0.1:8080: write: connection reset by peer
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45992->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45996->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:46002->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:46010->127.0.0.1:8080: write: connection reset by peer
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:46014->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:46022->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:46028->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.05s)
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:47740->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: unexpected EOF
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: unexpected EOF
--- FAIL: TestContentEncodingNoSniffing (0.05s)
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:35336->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:35340->127.0.0.1:8080: write: connection reset by peer
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:35342->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:35348->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.05s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45878->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.03s)
    --- FAIL: TestContentEncodingNoSniffing/no_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45908->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45914->127.0.0.1:8080: write: connection reset by peer
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:45918->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: unexpected EOF
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:47706->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.06s)
    --- FAIL: TestContentEncodingNoSniffing/phony_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:56668->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.02s)
    --- FAIL: TestContentEncodingNoSniffing/zlib_content-encoding,_zlibbed (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:56672->127.0.0.1:8080: write: connection reset by peer
--- FAIL: TestContentEncodingNoSniffing (0.04s)
    --- FAIL: TestContentEncodingNoSniffing/empty_but_set_content-encoding (0.00s)
        server_test.go:4231: GET https://127.0.0.1:8080: write tcp 127.0.0.1:35158->127.0.0.1:8080: write: connection reset by peer
FAIL
FAIL    golang.org/x/net/http2  430.663s
FAIL

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Change https://golang.org/cl/380154 mentions this issue: http2: in TestContentEncodingNoSniffing, do not allow the Transport to outlive the serverTester

@bcmills
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bcmills commented Jan 21, 2022

Marking as release-blocker: this test empirically affects multiple first-class ports, and I've mailed what I believe to be a fix.

@bcmills bcmills modified the milestones: Backlog, Go1.18 Jan 21, 2022
@bcmills bcmills added the Testing An issue that has been verified to require only test changes, not just a test failure. label Jan 21, 2022
dteh pushed a commit to dteh/fhttp that referenced this issue Jun 22, 2022
http2: in TestContentEncodingNoSniffing, do not allow the Transport t…
cf39dc4 
…o outlive the serverTester

This test constructed a new serverTester for each subtest, but reused
a Transport across all of the tests. I don't fully understand why, but
for some reason that occasionally led to "connection reset by peer"
failures when the port was reused.

Scoping the Transport to the lifetime of the serverTester seems to
resolve the errors: I tested with

	go test ./http2 -run=TestContentEncodingNoSniffing -httptest.serve=127.0.0.1:8080 -count=10000

and got lots of failures prior to this change and none after.

Fixes golang/go#46762
(I hope.)

Change-Id: I385c077c1d8627e42ce4d2db041878aacb5452fb
Reviewed-on: https://go-review.googlesource.com/c/net/+/380154
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
@rsc rsc unassigned neild and bcmills Jun 23, 2022
WeiminShang added a commit to WeiminShang/net that referenced this issue Nov 16, 2022
@WeiminShang
http2: in TestContentEncodingNoSniffing, do not allow the Transport t…
f9822fc 
…o outlive the serverTester

This test constructed a new serverTester for each subtest, but reused
a Transport across all of the tests. I don't fully understand why, but
for some reason that occasionally led to "connection reset by peer"
failures when the port was reused.

Scoping the Transport to the lifetime of the serverTester seems to
resolve the errors: I tested with

	go test ./http2 -run=TestContentEncodingNoSniffing -httptest.serve=127.0.0.1:8080 -count=10000

and got lots of failures prior to this change and none after.

Fixes golang/go#46762
(I hope.)

Change-Id: I385c077c1d8627e42ce4d2db041878aacb5452fb
Reviewed-on: https://go-review.googlesource.com/c/net/+/380154
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
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