Open
Description
What version of Go are you using (go version)?
$ go version go version go1.12.7 linux/amd64
Does this issue reproduce with the latest release?
Most likely.
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GOARCH="amd64" GOBIN="" GOCACHE="/home/ziyan/.cache/go-build" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="linux" GOOS="linux" GOPATH="/home/ziyan/go" GOPROXY="" GORACE="" GOROOT="/home/ziyan/software/go" GOTMPDIR="" GOTOOLDIR="/home/ziyan/software/go/pkg/tool/linux_amd64" GCCGO="gccgo" CC="gcc" CXX="g++" CGO_ENABLED="1" GOMOD="" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build414841088=/tmp/go-build -gno-record-gcc-switches"
What did you do?
conn, channels, requests, err := ssh.NewServerConn(...)
for channel := range channels {
channel.Reject(ssh.ConnectionFailed, "rejecting channel")
}Then keep trying to open new direct-tcpip channel on a SSH connection:
ssh -N gosshserver -L 9999:name:9999
telnet localhost 9999
telnet localhost 9999
telnet localhost 9999
What did you expect to see?
No memory leak over time.
What did you see instead?
Unconstrained memory leak.
112.52MB 68.69% 68.69% 155.30MB 94.81% golang.org/x/crypto/ssh.(*mux).newChannel
23.50MB 14.35% 83.04% 23.50MB 14.35% sync.NewCond
15.50MB 9.46% 92.50% 36MB 21.98% golang.org/x/crypto/ssh.newBuffer
7MB 4.27% 96.77% 7MB 4.27% golang.org/x/crypto/ssh.(*connectionState).readPacket
2.50MB 1.53% 98.30% 26MB 15.87% golang.org/x/crypto/ssh.newCond
1.28MB 0.78% 99.08% 1.28MB 0.78% golang.org/x/crypto/ssh.(*chanList).add