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net/http, net/http/httptest: locks being copied #16228

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josharian opened this issue Jun 30, 2016 · 7 comments

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commented Jun 30, 2016

From cmd/vet:

net/http/h2_bundle.go:5133: assignment copies lock value to *cfg: crypto/tls.Config contains sync.Once contains sync.Mutex
net/http/httptest/server.go:119: assignment copies lock value to *s.TLS: crypto/tls.Config contains sync.Once contains sync.Mutex

These seem like legitimate complaints.

It seems like tls.Config could use a Copy method, but probably not for Go 1.7.

cc @bradfitz @ianlancetaylor

@josharian josharian added this to the Go1.7Maybe milestone Jun 30, 2016

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commented Jun 30, 2016

Related to #15177?

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commented Jun 30, 2016

Yes, probably. It's not obvious to me from the immediate context why these are ok, though.

If they are ok, they're yet more (new?) false positives...in which case, #16227 is related.

cc @valyala

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commented Jul 1, 2016

Both cases look buggy, since they overwrite already existing mutex inside tls.Config with a new one.

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commented Aug 30, 2016

CL https://golang.org/cl/28075 mentions this issue.

gopherbot pushed a commit that referenced this issue Sep 1, 2016

crypto/tls: add Config.Clone
In Go 1.0, the Config struct consisted only of exported fields.

In Go 1.1, it started to grow private, uncopyable fields (sync.Once,
sync.Mutex, etc).

Ever since, people have been writing their own private Config.Clone
methods, or risking it and doing a language-level shallow copy and
copying the unexported sync variables.

Clean this up and export the Config.clone method as Config.Clone.
This matches the convention of Template.Clone from text/template and
html/template at least.

Fixes #15771
Updates #16228 (needs update in x/net/http2 before fixed)
Updates #16492 (not sure whether @agl wants to do more)

Change-Id: I48c2825d4fef55a75d2f99640a7079c56fce39ca
Reviewed-on: https://go-review.googlesource.com/28075
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
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commented Sep 1, 2016

d24f446 did the first half, and https://go-review.googlesource.com/28344 is the http2 part, which will be bundled in to std before Go 1.8. Closing.

@bradfitz bradfitz closed this Sep 1, 2016

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commented Sep 1, 2016

CL https://golang.org/cl/28344 mentions this issue.

gopherbot pushed a commit to golang/net that referenced this issue Sep 1, 2016

http2: fix all vet warnings
Updates golang/go#16228
Updates golang/go#11041

Change-Id: I2b50c2f4bfaae2d9ad59bc78e1c7c3e807f08075
Reviewed-on: https://go-review.googlesource.com/28344
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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commented Sep 13, 2016

CL https://golang.org/cl/29110 mentions this issue.

gopherbot pushed a commit that referenced this issue Sep 13, 2016

net/http: update bundled x/net/http2
Updates x/net/http2 (and x/net/lex/httplex) to git rev 749a502 for:

   http2: don't sniff first Request.Body byte in Transport until we have a conn
   https://golang.org/cl/29074
   Fixes #17071

   http2: add Transport support for unicode domain names
   https://golang.org/cl/29071
   Updates #13835

   http2: don't send bogus :path pseudo headers if Request.URL.Opaque is set
   https://golang.org/cl/27632
     +
   http2: fix bug where '*' as a valid :path value in Transport
   https://golang.org/cl/29070
   Updates #16847

   http2: fix all vet warnings
   https://golang.org/cl/28344
   Updates #16228
   Updates #11041

Also uses the new -underscore flag to x/tools/cmd/bundle from
https://golang.org/cl/29086

Change-Id: Ica0f6bf6e33266237e37527a166a783d78c059c4
Reviewed-on: https://go-review.googlesource.com/29110
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

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