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cmd/vet: new(sync.Once) copies lock value: sync.Once contains sync.Mutex #14994

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mholt opened this issue Mar 28, 2016 · 2 comments
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cmd/vet: new(sync.Once) copies lock value: sync.Once contains sync.Mutex #14994

mholt opened this issue Mar 28, 2016 · 2 comments
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@mholt
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@mholt mholt commented Mar 28, 2016

  1. What version of Go are you using (go version)?
    go version devel +ad391c9 Sat Mar 26 12:12:04 2016 +0000 linux/amd64
  2. What operating system and processor architecture are you using (go env)?
    GOARCH="amd64"
    GOBIN=""
    GOEXE=""
    GOHOSTARCH="amd64"
    GOHOSTOS="linux"
    GOOS="linux"
    GOPATH="/home/travis/gopath"
    GORACE=""
    GOROOT="/home/travis/.gimme/versions/go"
    GOTOOLDIR="/home/travis/.gimme/versions/go/pkg/tool/linux_amd64"
    CC="gcc"
    GOGCCFLAGS="-fPIC -m64 -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build398857422=/tmp/go-build"
    CXX="g++"
    CGO_ENABLED="0"
  3. What did you do?
    Ran CI tests on Go tip. Tests now fail on code that hasn't changed recently and still passes on Go 1.6. For example: https://travis-ci.org/mholt/caddy/builds/118687079
  4. What did you expect to see?
    No errors
  5. What did you see instead?
$ go vet ./...
caddy/config.go:194: function call copies lock value: sync.Once contains sync.Mutex
caddy/config_test.go:114: function call copies lock value: sync.Once contains sync.Mutex
caddy/config_test.go:115: function call copies lock value: sync.Once contains sync.Mutex

Relevant lines of code are:

onces[dir.name] = new(sync.Once)
map[string]*sync.Once{
    "dummy":  new(sync.Once),
    "dummy2": new(sync.Once),
}

Is new() really a function call that is copying a lock value?

@valyala

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@valyala valyala commented Mar 28, 2016

Should be fixed by the CL https://golang.org/cl/21222

@gopherbot

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@gopherbot gopherbot commented Mar 29, 2016

CL https://golang.org/cl/21222 mentions this issue.

@gopherbot gopherbot closed this in 72a1b53 Mar 30, 2016
@ianlancetaylor ianlancetaylor added this to the Go1.7 milestone Jul 20, 2016
@golang golang locked and limited conversation to collaborators Jul 20, 2017
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