go version go1.8.1 windows/amd64

C:\Users\someuser>go env
set GOARCH=amd64
set GOBIN=
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=C:\users\someuser\code\go
set GORACE=
set GOROOT=C:\Go
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0
set CXX=g++
set CGO_ENABLED=1
set PKG_CONFIG=pkg-config
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2

I am running an application that makes multiple HTTPS calls to different endpoints (it does not listen to any incoming connections). At some point (after 309 minutes in this case) the application will eventually panic . It appears that this occurs because of this chunk of code in transport.go:

	go func() {
		if trace != nil && trace.TLSHandshakeStart != nil {
			trace.TLSHandshakeStart()
		}
		err := tlsConn.Handshake()
		if timer != nil {
			timer.Stop()
		}
		errc <- err
	}()

Since this is a go routine I do not have the opportunity to recover from I'm not sure what I can do about this. tlsConn.Handshake() call is what eventually raises the panic.

Here is the panic text (note that this is only the first panic. There were some 200 go routines running so I have not provided the dump of them all):

Exception 0xc0000005 0x0 0x609 0x7ffb1ef5c61f
PC=0x7ffb1ef5c61f

syscall.Syscall6(0x7ffb1ef3ca40, 0x4, 0x4, 0x328e9d0, 0xc042b9f3d0, 0xc042b9f3e0, 0x0, 0x0, 0xc04257cc80, 0x26c8f20, ...)
C:/Go/src/runtime/syscall_windows.go:174 +0x6b
syscall.CertVerifyCertificateChainPolicy(0x4, 0x328e9d0, 0xc042b9f3d0, 0xc042b9f3e0, 0x0, 0xc042e633d8)
C:/Go/src/syscall/zsyscall_windows.go:1208 +0xc1
crypto/x509.checkChainSSLServerPolicy(0xc04211fb00, 0x328e9d0, 0xc042b9f808, 0x34d5110, 0xc042e63548)
C:/Go/src/crypto/x509/root_windows.go:117 +0xfd
crypto/x509.(*Certificate).systemVerify(0xc04211fb00, 0xc042e63808, 0x0, 0x0, 0x0, 0x0, 0x0)
C:/Go/src/crypto/x509/root_windows.go:212 +0x484
crypto/x509.(*Certificate).Verify(0xc04211fb00, 0xc0421dc4c0, 0x1b, 0xc042345350, 0x0, 0xed11c8f28, 0x2622224, 0x955620, 0x0, 0x0, ...)
C:/Go/src/crypto/x509/verify.go:279 +0x86c
crypto/tls.(*clientHandshakeState).doFullHandshake(0xc042b9fe50, 0xc0424aa700, 0x66)
C:/Go/src/crypto/tls/handshake_client.go:300 +0x4c0
crypto/tls.(*Conn).clientHandshake(0xc0424ae380, 0x7b2d40, 0xc0424ae4a0)
C:/Go/src/crypto/tls/handshake_client.go:228 +0xf97
crypto/tls.(*Conn).Handshake(0xc0424ae380, 0x0, 0x0)
C:/Go/src/crypto/tls/conn.go:1307 +0x1aa
net/http.(*Transport).dialConn.func3(0x0, 0xc0424ae380, 0xc042feecc0, 0xc042f8d260)
C:/Go/src/net/http/transport.go:1082 +0x49
created by net/http.(*Transport).dialConn
C:/Go/src/net/http/transport.go:1087 +0xff3

Edit: I should also mention that I was running at ~200 calls / second at the time of failure