Description
Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (go version)?
go version go1.9.2 linux/amd64
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (go env)?
CentOS 6
GOARCH="amd64"
GOBIN="/home/annsam/go/bin"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/annsam/go"
GORACE=""
GOROOT="/home/annsam/bin/go"
GOTOOLDIR="/home/annsam/bin/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build210233403=/tmp/go-build"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
What did you do?
If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.
package main
import (
"fmt"
"net/http"
)
func main() {
// Something about this URL:
traceRedirects("https://www.bizjournals.com/twincities/morning_roundup/2013/07/richfield-green-lights-25m-car-dealer.html")
// causes the next URL retrieved to SIGSEGV (doesn't matter what the URL is)
traceRedirects("https://www.google.com")
}
func traceRedirects(testURL string) {
nextURL := testURL
var i int
for i < 10 {
client := &http.Client{
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
}}
req, err := http.NewRequest("HEAD", nextURL, nil)
if err != nil {
fmt.Println(err)
return
}
resp, err := client.Do(req)
if err != nil {
fmt.Println(err)
return
}
defer resp.Body.Close()
fmt.Printf("i: %d, StatusCode: %d: %q", i, resp.StatusCode, resp.Request.URL)
nextURL = resp.Header.Get("Location")
if nextURL == "" {
fmt.Println("Done!")
return
}
i += 1
}
}
What did you expect to see?
No panics
What did you see instead?
$ ./foo
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x5bb360]
goroutine 29 [running]:
net/http.(*http2pipe).Write(0xc420370ca8, 0xc420560000, 0xb42, 0xb42, 0x0, 0x0, 0x0)
/home/annsam/bin/go/src/net/http/h2_bundle.go:3661 +0x100
net/http.(*http2clientConnReadLoop).processData(0xc420045fb0, 0xc4205a6120, 0xc4205a6120, 0x0)
/home/annsam/bin/go/src/net/http/h2_bundle.go:8259 +0x2ac
net/http.(*http2clientConnReadLoop).run(0xc420045fb0, 0x67ecc8, 0xc420031fb0)
/home/annsam/bin/go/src/net/http/h2_bundle.go:7896 +0x54f
net/http.(*http2ClientConn).readLoop(0xc4200761a0)
/home/annsam/bin/go/src/net/http/h2_bundle.go:7788 +0x9d
created by net/http.(*http2Transport).newClientConn
/home/annsam/bin/go/src/net/http/h2_bundle.go:7053 +0x6b9