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net/http: data race writing to req.Header when serving push #18326

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FiloSottile opened this issue Dec 15, 2016 · 6 comments
Closed

net/http: data race writing to req.Header when serving push #18326

FiloSottile opened this issue Dec 15, 2016 · 6 comments
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@tombergan
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Go1.8

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@FiloSottile
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@FiloSottile FiloSottile commented Dec 15, 2016

What version of Go are you using (go version)?

go version go1.8beta1 darwin/amd64

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/filippo/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.8beta1/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.8beta1/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/v8/xdj2snz51sg2m2bnpmwl_91c0000gn/T/go-build410982852=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

What did you do?

Modified the req.Header map from a Handler invoked by Push.

https://play.golang.org/p/3azPpVRX8f

What did you see instead?

==================
WARNING: DATA RACE
Read at 0x00c42006fdd0 by goroutine 17:
  runtime.mapiterinit()
      /usr/local/Cellar/go/1.8beta1/libexec/src/runtime/hashmap.go:668 +0x0
  net/http.(*http2sorter).Keys()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:2739 +0xb8
  net/http.http2encodeHeaders()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:7604 +0x365
  net/http.(*http2writePushPromise).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:7542 +0x257
  net/http.(*http2serverConn).writeFrameAsync()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3450 +0x58

Previous write at 0x00c42006fdd0 by goroutine 16:
  runtime.mapassign()
      /usr/local/Cellar/go/1.8beta1/libexec/src/runtime/hashmap.go:485 +0x0
  net/textproto.MIMEHeader.Set()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/textproto/header.go:22 +0x7e
  net/http.Header.Set()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/header.go:31 +0x60
  main.main.func2()
      test.go:18 +0x7c
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1930 +0x51
  net/http.(*ServeMux).ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:2226 +0xa2
  net/http.serverHandler.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:2556 +0xbc
  net/http.initNPNRequest.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:3076 +0x109
  net/http.(*initNPNRequest).ServeHTTP()
      <autogenerated>:310 +0x98
  net/http.(Handler).ServeHTTP-fm()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:4286 +0x64
  net/http.(*http2serverConn).runHandler()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:4566 +0x96

Goroutine 17 (running) created at:
  net/http.(*http2serverConn).startFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3732 +0x33b
  net/http.(*http2serverConn).scheduleFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3823 +0x3e1
  net/http.(*http2serverConn).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3686 +0x76
  net/http.(*http2serverConn).startPush()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5227 +0x33d
  net/http.(*http2serverConn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3533 +0x987
  net/http.(*http2Server).ServeConn()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3170 +0xc82
  net/http.http2ConfigureServer.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3052 +0xe7
  net/http.(*conn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1734 +0x1956

Goroutine 16 (running) created at:
  net/http.(*http2serverConn).startPush.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5213 +0x598
  net/http.(*http2serverConn).startFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3714 +0x3bb
  net/http.(*http2serverConn).scheduleFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3823 +0x3e1
  net/http.(*http2serverConn).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3686 +0x76
  net/http.(*http2serverConn).startPush()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5227 +0x33d
  net/http.(*http2serverConn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3533 +0x987
  net/http.(*http2Server).ServeConn()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3170 +0xc82
  net/http.http2ConfigureServer.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3052 +0xe7
  net/http.(*conn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1734 +0x1956
==================
==================
WARNING: DATA RACE
Read at 0x00c4201f2088 by goroutine 17:
  net/http.http2encodeHeaders()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:7607 +0xdd
  net/http.(*http2writePushPromise).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:7542 +0x257
  net/http.(*http2serverConn).writeFrameAsync()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3450 +0x58

Previous write at 0x00c4201f2088 by goroutine 16:
  net/textproto.MIMEHeader.Set()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/textproto/header.go:22 +0xdf
  net/http.Header.Set()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/header.go:31 +0x60
  main.main.func2()
      test.go:18 +0x7c
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1930 +0x51
  net/http.(*ServeMux).ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:2226 +0xa2
  net/http.serverHandler.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:2556 +0xbc
  net/http.initNPNRequest.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:3076 +0x109
  net/http.(*initNPNRequest).ServeHTTP()
      <autogenerated>:310 +0x98
  net/http.(Handler).ServeHTTP-fm()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:4286 +0x64
  net/http.(*http2serverConn).runHandler()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:4566 +0x96

Goroutine 17 (running) created at:
  net/http.(*http2serverConn).startFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3732 +0x33b
  net/http.(*http2serverConn).scheduleFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3823 +0x3e1
  net/http.(*http2serverConn).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3686 +0x76
  net/http.(*http2serverConn).startPush()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5227 +0x33d
  net/http.(*http2serverConn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3533 +0x987
  net/http.(*http2Server).ServeConn()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3170 +0xc82
  net/http.http2ConfigureServer.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3052 +0xe7
  net/http.(*conn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1734 +0x1956

Goroutine 16 (running) created at:
  net/http.(*http2serverConn).startPush.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5213 +0x598
  net/http.(*http2serverConn).startFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3714 +0x3bb
  net/http.(*http2serverConn).scheduleFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3823 +0x3e1
  net/http.(*http2serverConn).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3686 +0x76
  net/http.(*http2serverConn).startPush()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5227 +0x33d
  net/http.(*http2serverConn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3533 +0x987
  net/http.(*http2Server).ServeConn()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3170 +0xc82
  net/http.http2ConfigureServer.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3052 +0xe7
  net/http.(*conn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1734 +0x1956
==================
==================
WARNING: DATA RACE
Read at 0x00c4201c21e0 by goroutine 17:
  net/http.http2encodeHeaders()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:7614 +0x17d
  net/http.(*http2writePushPromise).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:7542 +0x257
  net/http.(*http2serverConn).writeFrameAsync()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3450 +0x58

Previous write at 0x00c4201c21e0 by goroutine 16:
  net/textproto.MIMEHeader.Set()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/textproto/header.go:22 +0xae
  net/http.Header.Set()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/header.go:31 +0x60
  main.main.func2()
      test.go:18 +0x7c
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1930 +0x51
  net/http.(*ServeMux).ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:2226 +0xa2
  net/http.serverHandler.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:2556 +0xbc
  net/http.initNPNRequest.ServeHTTP()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:3076 +0x109
  net/http.(*initNPNRequest).ServeHTTP()
      <autogenerated>:310 +0x98
  net/http.(Handler).ServeHTTP-fm()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:4286 +0x64
  net/http.(*http2serverConn).runHandler()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:4566 +0x96

Goroutine 17 (running) created at:
  net/http.(*http2serverConn).startFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3732 +0x33b
  net/http.(*http2serverConn).scheduleFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3823 +0x3e1
  net/http.(*http2serverConn).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3686 +0x76
  net/http.(*http2serverConn).startPush()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5227 +0x33d
  net/http.(*http2serverConn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3533 +0x987
  net/http.(*http2Server).ServeConn()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3170 +0xc82
  net/http.http2ConfigureServer.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3052 +0xe7
  net/http.(*conn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1734 +0x1956

Goroutine 16 (running) created at:
  net/http.(*http2serverConn).startPush.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5213 +0x598
  net/http.(*http2serverConn).startFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3714 +0x3bb
  net/http.(*http2serverConn).scheduleFrameWrite()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3823 +0x3e1
  net/http.(*http2serverConn).writeFrame()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3686 +0x76
  net/http.(*http2serverConn).startPush()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:5227 +0x33d
  net/http.(*http2serverConn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3533 +0x987
  net/http.(*http2Server).ServeConn()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3170 +0xc82
  net/http.http2ConfigureServer.func1()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/h2_bundle.go:3052 +0xe7
  net/http.(*conn).serve()
      /usr/local/Cellar/go/1.8beta1/libexec/src/net/http/server.go:1734 +0x1956
==================
@bradfitz bradfitz added this to the Go1.8 milestone Dec 15, 2016
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@FiloSottile FiloSottile commented Dec 15, 2016 •
edited

For a common use case, think ReverseProxy.

EDIT: ReverseProxy actually tries to make a copy of the map before modifying it but might have overlooked a copiedHeaders check. If it's the case I'll file a separate issue.
@FiloSottile FiloSottile mentioned this issue Dec 15, 2016
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@gopherbot gopherbot commented Dec 15, 2016

CL https://golang.org/cl/34493 mentions this issue.
gopherbot pushed a commit to golang/net that referenced this issue Dec 15, 2016
@tombergan @broady
http2: fix race in writePushPromise
1195a05 
Writing the PUSH_PROMISE can happen concurrently with the request
handler, so we should pass the request handler a cloned Header..

Updates golang/go#18326

Change-Id: I918e7ffbc02459b9ede3226f4bd3c56a6a3b350f
Reviewed-on: https://go-review.googlesource.com/34493
TryBot-Result: Gobot Gobot <gobot@golang.org>
Run-TryBot: Tom Bergan <tombergan@google.com>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
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@gopherbot gopherbot commented Dec 15, 2016

CL https://golang.org/cl/34495 mentions this issue.
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@gopherbot gopherbot commented Dec 15, 2016

CL https://golang.org/cl/34494 mentions this issue.
gopherbot pushed a commit to golang/net that referenced this issue Dec 15, 2016
@tombergan @bradfitz
http2: add regression test for issue golang/go#18326
989b0d9 
Updates golang/go#18326

Change-Id: Iaed30073bab10c7fc25132b388d7b2fc101293d5
Reviewed-on: https://go-review.googlesource.com/34494
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
gopherbot pushed a commit that referenced this issue Dec 15, 2016
@broady
net/http: update bundled http2
651d392 
Updates bundled x/net/http2 to git rev 1195a05d for:

    http2: fix incorrect panic
    https://golang.org/cl/34498

    http2: fix race in writePushPromise
    https://golang.org/cl/34493

    http2: speed up TestTransportFlowControl in short mode
    https://golang.org/cl/33241

    http2: don't flush a stream's write queue in sc.resetStream
    https://golang.org/cl/34238

    http2: allow Transport to connect to https://[v6literal]/ without port
    https://golang.org/cl/34143

    http2: log Framer reads and writes when a server test fails
    https://golang.org/cl/34130

Updates #18326
Updates #18273
Updates #18111
Updates #18248
Updates #18235

Change-Id: I18c7a297fc94d6a843284efcfc43e0fdab9b5f41
Reviewed-on: https://go-review.googlesource.com/34495
Run-TryBot: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@tombergan tombergan commented Dec 15, 2016

Should be fixed.
@tombergan tombergan closed this Dec 15, 2016
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@FiloSottile FiloSottile commented Dec 15, 2016

Confirmed, thanks.
nimakaviani added a commit to cloudfoundry/diego-release that referenced this issue Jun 26, 2017
@nimakaviani Diego
bump executor go-loggregator inigo rep volman net text
aefac4e 
[finishes #140766303]

Submodule src/code.cloudfoundry.org/executor 1a653cd..85f35ea:
  > update go-loggregator package
Submodule src/code.cloudfoundry.org/go-loggregator 0550818..b1525c9:
  > Fix testhelpers/v1/fakes
  > Merge pull request #10 from apoydence/split-NewTLSConfig
  > Ensure all runtime emitters have a default timeout of 10 seconds
  > Add SendComponentMetric to compatibility client
  > Fix typo
  > TestIngressServer uses address instead of port
  > TestEgressServer needs to save actual address
  > Removes NewInsecureIngressClient
  > IngressClient uses addr instead of port
  > Adds TestEgressServer
  > Renames TestServer to TestIngressServer
  > Fix examples
  > Moves v1 fakes to separate package
  > Adds egress client wrapper
  > Renames Option to IngressOption
  > Renames Client to IngressClient
  > Adds WithDelta option for EmitCounter
  > Moves TestServer to testhelpers package
  > Moves fakes under testhelpers directory
  > Adds ability to create an insecure client
  > Add google.golang.org/genproto to vendors
  > Bump google.golang.org/grpc to v1.4.0
  > Export generated loggregator-api files
  > Fix v2 import in examples/simple
  > Add v1 compatability for runtime stats emitter
  > Fix import for runtime_stats example
  > Move fixtures into example dir
  > Rename suite_test
  > Move v2 contents to root directory
  > Moves generic client and fakes to compatability folder
  > Use gobindata for feature tests.
  > Add gomega dependency to scripts/test
  > Adds another required dependency
  > Updates go-loggregator test script
  > Remove go dep tooling and submodule dependencies
  > Revert "Pin grpc-go using dep and remove dep-ensure script"
  > Changes runtimeemitter emission interval to 10 seconds
  > Pin grpc-go using dep and remove dep-ensure script
  > Add tags to logs, gauges and counters.
  > Merge branch 'enocom/master'
  > update Gopkg files
  > Merge pull request #4 from kdykeman/master
  > Merge pull request #2 from hdub2/master
  > Fixes batch interval emission
  > Adds example for using runtime emitter
  > Add runtime emitter to emit runtime stats on interval
  > fix datarace in v2 client test
  > Update README.md
Submodule src/code.cloudfoundry.org/inigo da0693e..f8f80a2:
  > update go-loggregator package
Submodule src/code.cloudfoundry.org/rep ca15821..8fe785b:
  > emit runtime metrics when using loggregator v2 API
Submodule src/code.cloudfoundry.org/volman 64f4d4e..3ee7830:
  > update go-loggregator package
Submodule src/golang.org/x/net c4bb2f7..5f8847a:
  > dns/dnsmessage: additional test coverage
  > dns/dnsmessage: allocation free DNS message parsing and building
  > ipv6: report a destination address on write error
  > ipv4: report a destination address on write error
  > icmp: use socket.NativeEndian
  > ipv6: use socket.NativeEndian
  > http2: fix Server race
  > trace: export /debug/requests and /debug/events handlers
  > http2: make Transport treat http.NoBody like it were nil
  > publicsuffix: update table to latest list from publicsuffix.org
  > http2: stop rejecting outgoing paths beginning with two slashes
  > internal/socket: don't crash with corrupted control messages
  > bpf: add Setter interface
  > http2: fix up comment on unexported connError type
  > ipv6: don't crash with corrupted control messages
  > ipv4: don't crash with corrupted control messages
  > ipv6: deflake multicast listener tests
  > ipv4: deflake multicast listener tests
  > bpf: fix type of Extension constants
  > internal/socket: fix 386 emulation on amd64 for FreeBSD
  > ipv6: add {Read,Write}Batch methods to PacketConn
  > ipv4: add {Read,Write}Batch methods to {Packet,Raw}Conn
  > http2: fix nil dereference after Read completes with an error
  > http2: fix typo in comment
  > internal/socket: add message IO functionality
  > internal/socket: add platform-dependent boilerplate files
  > nettest: skip testConcurrentMethods on Plan 9
  > http2/hpack: gofmt -w -s
  > internal/iana: update DSCP names
  > Revert "ipv4, ipv6, internal/netreflect, bpf: fix the x/net build"
  > internal/socket: merge internal/netreflect into internal/socket package
  > ipv6: plumb in the standard library of Go 1.9 by using internal/socket package
  > ipv4: plumb in the standard library of Go 1.9 by using internal/socket package
  > internal/socket: new package
  > http2: fix RFC number typo in comment
  > http2: remove extra goroutine stack from awaitGracefulShutdown
  > http2: Discard DATA frames from the server after the response body is closed
  > http2: mostly test for Transport memory issue
  > http2/hpack: remove unused pair function from package
  > http2/hpack: remove pair function and initialize directly
  > http2: fix style inconsistency in test
  > http2: reduce the number of select cases in serverConn.server
  > http2: fix lock contention slowdown due to gracefulShutdownCh
  > http2/hpack: move initialization to a static table
  > lif: rename internal types
  > http2: add all bad ciphers, use package constants
  > xsrftoken: panic for unsafe zero length keys
  > route: don't fail test when at least one version of INET protocols is available
  > lif: don't fail test when at least one version of INET protocols is available
  > trace: support Go 1.6 again
  > nettest: break on unexpected error
  > trace: use standard library context
  > http2: Use NO_ERROR instead of CANCEL when responding before the request is finished
  > http2: enforce write deadline per stream
  > http2/h2demo: don't auto redirect the HTTP-only serverpush demo to HTTPS
  > http2/hpack: fix memory leak in headerFieldTable lookup maps
  > http2/h2demo: use HTTP host for HTTP-only link
  > http2/h2demo: add demo for HTTP/2 Server Push
  > Revert "http2/h2demo: add HTTP/2 with Server Push"
  > idna: copy the idna package from x/text, take 2.
  > http2/h2demo: add HTTP/2 with Server Push
  > http2: work around Go 1.8 tls.Config.Clone bug
  > lif: use of nativeEndian to make API endian agnostic
  > dns/dnsmessage: add support for parsing and packing of DNS messages
  > http2: add configurable knobs for the server's receive window
  > http2/hpack: speedup Encoder.searchTable
  > http2: Add opt-in option to Framer to allow DataFrame struct reuse
  > http2: replace fixedBuffer with dataBuffer
  > http2/hpack: remove hpack's constant time string comparison
  > ipv4, ipv6, internal/netreflect, bpf: fix the x/net build
  > route: drop support for go1.5
  > lif: drop support for go1.5
  > internal/netreflect: don't build on go1.9 or above
  > publicsuffix: update table to latest list from publicsuffix.org
  > proxy: split SOCKS5 Dial method in two
  > context/ctxhttp: close httptest server
  > internal/netreflect: fix test on NaCl and Plan 9
  > route: fix typo
  > route: add support for the manipulation of routing informaion
  > http2: don't allow writing non-zero padding unless Framer.AllowIllegalWrites
  > all: single space after period
  > idna: Revert "use code generated by internal x/text package"
  > bpf: implement fmt.Stringer for BPF instructions
  > trace: initialize templates lazily
  > ipv4: simplify init function for darwin
  > internal/netreflect: more use of internal/nettest package
  > internal/nettest: add missing support for "unixgram" to TestableNetwork
  > http2: nit in TestServer_Push_StateTransitions
  > http2: fix flake in TestServer_Push_StateTransitions
  > internal/nettest: add TestableNetwork, NewLocalListener and NewLocalPacketListener
  > nettest: use of internal/nettest package
  > http2/h2i: strip port from server name in client hello
  > internal/netreflect: use of internal/nettest package
  > http2/h2i: send RequestURI as path, to not lose query args
  > x/net/bpf: cleanup TestAsmDisasm
  > http2: fix nits found by vet
  > bpf: disasm load extension to type LoadExtension
  > bpf: disasm "fake" jump conditions
  > ipv6: add missing BUGS section for Windows
  > ipv4: drop package name prefix from identifiers in docs for consistency
  > ipv6: drop package name prefix from identifiers in docs for consistency
  > idna: use code generated by internal x/text package
  > http2: remove unnecessary TODO for trailer keys allocation
  > http2: clear WriteTimeout in Server
  > http2: fix typo
  > http2: fix incorrect panic
  > http2: add regression test for issue golang/go#18326
  > http2: fix race in writePushPromise
  > icmp: add missing BUGS section
  > ipv6: add missing BUGS section
  > ipv4: add missing BUGS section
  > context: deflake tests under Go 1.6
  > http2: speed up TestTransportFlowControl in short mode
  > http2: don't flush a stream's write queue in sc.resetStream
  > http2: allow Transport to connect to https://[v6literal]/ without port
  > http2: log Framer reads and writes when a server test fails
  > ipv4: deflake TestConnUnicastSocketOptions on Windows
  > ipv4: add missing IP_HDRINCL option on Windows
  > nettest: update comment on MakePipe
  > ipv6: add support for linux/{mips,mipsle}
  > ipv4: add support for linux/{mips,mipsle}
  > http2: make Transport retry on server's GOAWAY graceful shutdown
  > http2: fix minor stream accounting bug
  > http2: test for retry after GOAWAY
  > nettest: add package to test for networking conformance
  > websocket: mention the gorilla package
  > ipv6: don't fail test on IPv6 disabled kernel
  > ipv6: simplify references to RFCs in package documentation
  > ipv6: document that package ipv6 doesn't support Darwin kernel version 12 or below
  > internal/nettest: make SupportsIPv6 return false on Darwin kernel version 12 or below
  > http2: fix a typo
  > http2: don't crash when writing RST_STREAM on idle or closed streams
  > trace: remove internal Google reference from comment
  > webdav: gofmt -w -s
  > http2: schedule RSTStream writes onto its stream's queue
  > http2/h2demo: use Let's Encrypt for the TLS cert
  > http2: make Server respect http1 Server's SetKeepAlivesEnabled
  > Revert "ipv6: disable multicast packet delivery tests on darwin 12 or below"
  > ipv6: disable multicast packet delivery tests on darwin 12 or below
  > http2: conditionally log stacks from panics in Server Handlers like net/http
  > http2: fix CloseNotify data race
  > http2: don't overflow stream IDs in server push
  > http2: fix racey and flaky server push test
  > http2: disable server push on receiving a GOAWAY
  > all: make copyright headers consistent with one space after period
  > http2: fix state tracking for pushed streams
  > Revert "context: use Go 1.8 type alias for CancelFunc and Context"
  > http2: fix over-aggressive ignoring of frames while in "go away" mode
  > http2: fix Transport race sending RST_STREAM while reading DATA on cancels
  > http2: remove h2-14 ALPN proto
  > webdav: add Context argument to FileSystem interface
  > http2: make http2.Server access http1's Server via an interface check
  > http2/h2i: do not assume that stdin value is always 0
  > http2: add support for graceful shutdown of Server
  > webdav: fix recently-broken tests
  > http2: change how Server.IdleTimeout is initialized from http.Server
  > http2/h2i: update line endings for recent change to console package
  > webdav: have escapeXML perform fewer allocations.
  > context: use Go 1.8 type alias for CancelFunc and Context
  > http2: initialize Server.IdleTimeout from http.Server as http1 does
  > http2: fix optimized write scheduling
  > http2: implement support for server push
  > http2: reject stream self-dependencies
  > http2: optimize server frame writes
  > http2: interface to support pluggable schedulers
  > publicsuffix: update table to latest list from publicsuffix.org
  > http2: add Server.IdleTimeout
  > webdav: escape displayname
  > http2: make Server return conn protocol errors on bad idle stream frames
  > http2: fix Server race with concurrent Read/Close
  > ipv6: remove unnecessary control message marshaling
  > ipv4: remove unnecessary control message marshaling
  > http2: make Server reuse 64k request body buffer between requests
  > http2: never Read from Request.Body in Transport to determine ContentLength
  > websocket: drop support for go1.4 or below
  > websocket: use of crypto/rand package in test
  > ipv6: drop support for go1.4 or below
  > ipv4: drop support for go1.4 or below
  > websocket: limit incoming payload size
  > ipv4: add support for FreeBSD 11
  > trace: don't allocate all events upfront
  > Revert "trace: don't allocate all events upfront"
  > lif: rename internal types and constants generated by cgo
  > ipv6: rename internal types and constants generated by cgo
  > ipv4: rename internal types and constants generated by cgo
  > trace: don't allocate all events upfront
  > ipv6: don't refer to cgo-generated union field
  > ipv4: don't refer to cgo-generated union field
  > ipv6: add support for solaris
  > ipv4: add support for solaris
  > ipv6: rename thunk_linux_386.s to sys_linux_386.s
  > ipv4: rename thunk_linux_386.s to sys_linux_386.s
  > http2: remove duplicate map lookups in checkConnHeaders
  > websocket: use net.Dialer to open tcp connection
  > http2: mention bogus header value in error messages
  > trace: spelling consistency tweaks
  > http2: don't sniff Request.Body on 100-continue requests in Transport
  > http2: in Server, disarm connection's ReadTimeout after first request
  > http2: add Transport support for IdleConnTimeout
  > http: fix build on Go 1.6 and below
  > http2: implement Ping method on ClientConn
  > x/net/http2: use request url scheme
  > lif: new package
  > route: fix typo
  > ipv4: fix typo
  > ipv6: fix typo
  > route: test helper code cleanup
  > http2: fix broken tests
  > x/net/http2: Fix various typos in doc comments.
  > ipv6: simplify init function for darwin
  > internel/nettest: add SupportsIPv6MulticastDeliveryOnLoopback
  > http2: don't sniff first Request.Body byte in Transport until we have a conn
  > http2: add Transport support for unicode domain names
  > http2: fix bug where '*' as a valid :path value in Transport
  > icmp: don't step on recycled socket descriptors
  > net: skip tests on OS X 10.8 to avoid a kernel panic
  > http2: fix all vet warnings
  > internal/netreflect: fix test on nacl, plan9 and windows
  > ipv6: deduplicate socket option code
  > ipv4: deduplicate socket option code
  > ipv6: use of internal/netreflect package
  > ipv4: use of internal/netreflect package
  > internal/netreflect: new package
  > http2: don't send bogus :path pseudo headers if Request.URL.Opaque is set
  > http2: fix protocol violation regression when writing certain request bodies
  > publicsuffix: update table to latest list from publicsuffix.org
  > http2: adjust flow control on open streams when processing SETTINGS
  > http2: add missing import path declaration
  > http2: add more Transport logging around why connections close
  > http2: fix Transport.RoundTrip hang on stream error before headers
  > http2: add more HEADERS and error logging in GODEBUG=http2debug=2 mode
  > http2: make Transport work around mod_h2 bug
  > http2: don't ignore DATA padding in flow control
  > http2: return flow control for closed streams
  > http2: fix data race on cc.singleUse
  > route: don't crash or hang up with corrupted messages
  > http2: make Transport prefer HTTP response header recv before body write error
  > http2: make Transport treat "Connection: close" the same as Request.Close
  > context/ctxhttp: if context is canceled, return its error
  > http2: fix flaky TestTransportResPattern_* tests
  > http2: make Transport honor Request.Close more aggressively
  > http2: fix flaky TestTransportReqBodyAfterResponse_403
  > context/ctxhttp: add a specialized minimal version for Go 1.7
  > publicsuffix: update table to latest list from publicsuffix.org.
  > http2: add additional blacklisted ciphersuites
  > http2: merge multiple GOAWAY frames' contents into error message
  > http2: make Transport return server's GOAWAY error back to the user
  > webdav: skip test that fails with gccgo
  > ipv4: add support for ppc (using gccgo)
  > ipv6: add support for ppc (using gccgo)
  > http2: fix typo in ReadFrame
  > bpf: implement LoadExtension and ExtLen for VM
  > bpf: fix a typo
  > bpf: add Go implementation of virtual machine
  > webdav: respect the Handler.Prefix in confirmLocks.
  > publicsuffix: strip generated comments; automatically scrape git version.
  > http2: fix data race on pipe
  > http2: consider buffered data when doing stream flow control
  > http2: GotFirstResponseByte hook should only fire once
  > websocket: fix Read behaviour in hybiFrameReader.Read
  > webdav: set 'getlastmodified' live property for directories
  > http2: fix nits in test
  > http2: allow http scheme for http2
  > http2: prevent Server from sending status 100 header after anything else
  > http2: let handlers close Request.Body without killing streams
  > http2: fix Transport.CloseIdleConnections when http1+http2 are wired together
  > http2: delay sending request body in Transport if 100-continue is set
  > http2, lex/httplex: make Transport reject bogus headers before sending
  > http2: reject more trailer values
  > http2: with Go 1.7 set Request.Context in ServeHTTP handlers
  > http2: when using Go 1.7, make Transport use httptrace hooks
  > ipv6: add support for linux/s390x
  > ipv4: add support for linux/s390x
  > route: fix typos in test
  > ipv6: support attaching packet filters to PacketConn.
  > ipv4: support attaching packet filters to PacketConn/RawConn.
  > route: new package
  > http2/hpack: forbid excess and invalid padding in hpack decoder
  > http2: make Transport use Request.Context, set Response.Uncompressed
  > context: correct spelling of TODO in comment
  > ipv4: don't fail test on big endian machine
  > icmp: don't fail test on big endian machine
  > net/trace: fix comment typo
  > context: fix doc typo
  > http2: allow StreamDep of 0 in HEADERS and PRIORITY frames
  > http2: delete pre-Go1.5 request cancellation
  > context/ctxhttp: remove pre-Go 1.5 support
  > context: bump gccgo-specific alloc limit for WithTimeout test.
  > http2: standardize RFC mention format
  > ipv6: fix a typo
  > ipv4: fix a typo
  > icmp: fix a typo
  > http2: fix typos
  > http2/hpack: fix a typo
  > webdav: have the exported API use the standard library's xml.Name type.
  > webdav: rename the "etc/internal/xml" import.
  > webdav: run "gofmt -s" to simplify some tests.
  > webdav: fill in the package's doc comment.
  > webdav: remove runtime check for Go 1.4 or earlier.
  > http2: make Server reject connection-level headers with a 400 response
  > websocket: remove redundant error handling
  > context: implement in terms of the standard library for Go 1.7+
  > http2: Ignore Keep-Alive header in requests
  > bpf: rename LoadIPv4HeaderLen to the more generic LoadMemShift.
Submodule src/golang.org/x/text 0000000...4e9ab9e (new submodule)

Signed-off-by: Chris Piraino <cpiraino@pivotal.io>
@golang golang locked and limited conversation to collaborators Dec 15, 2017
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