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net/http: fix a data race when Request.Cancel is used

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The "add a Request.Cancel channel" change (https://golang.org/cl/11601)
added support for "race free" cancellation, but introduced a data race. :)

Noticed while running "go test -race net/http". The test is skipped in
short mode, so we never saw it on the dashboard.

Change-Id: Ica14579d8723f8f9d1691e8d56c30b585b332c64
Reviewed-on: https://go-review.googlesource.com/12663
Reviewed-by: Aaron Jacobs <jacobsa@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Brad Fitzpatrick 2015-07-24 16:27:07 -07:00
parent 56a062400a
commit da87cf5dcf
1 changed files with 1 additions and 0 deletions
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1
src/net/http/transport.go
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@ -975,6 +975,7 @@ func (pc *persistConn) readLoop() {
// the underlying bufio reader.
select {
case <-rc.req.Cancel:
alive = false
pc.t.CancelRequest(rc.req)
case bodyEOF := <-waitForBodyRead:
pc.t.setReqCanceler(rc.req, nil) // before pc might return to idle pool