tailscale/tailscale · error

failed to get rx timestamp: %v

Error message

failed to get rx timestamp: %v

What it means

Error "failed to get rx timestamp: %v" thrown in tailscale/tailscale.

Source

Thrown at cmd/stunstamp/stunstamp_linux.go:179

			if rxMsg.Type != ipv4.ICMPTypeEchoReply {
				continue
			}
		} else {
			if rxMsg.Type != ipv6.ICMPTypeEchoReply {
				continue
			}
		}
		if rxMsg.Code != txMsg.Code {
			continue
		}
		rxBody, ok := rxMsg.Body.(*icmp.Echo)
		if !ok || rxBody.Seq != txBody.Seq || !bytes.Equal(rxBody.Data, txBody.Data) {
			continue
		}
		if source == timestampSourceKernel {
			rxAt, err = parseTimestampFromCmsgs(oob[:oobn])
			if err != nil {
				return 0, fmt.Errorf("failed to get rx timestamp: %v", err)
			}
		}
		return rxAt.Sub(txAt), nil
	}
}

func measureSTUNRTTKernel(conn io.ReadWriteCloser, _ string, dst netip.AddrPort) (rtt time.Duration, err error) {
	sconn, ok := conn.(*socket.Conn)
	if !ok {
		return 0, fmt.Errorf("conn of unexpected type: %T", conn)
	}

	var to unix.Sockaddr
	if dst.Addr().Is4() {
		to = &unix.SockaddrInet4{
			Port: int(dst.Port()),
		}
		copy(to.(*unix.SockaddrInet4).Addr[:], dst.Addr().AsSlice())

View on GitHub (pinned to cfe32b8be6)

When it happens

Trigger: Thrown at cmd/stunstamp/stunstamp_linux.go:179 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tailscale/tailscale@cfe32b8be6 (2026-08-15). Data as JSON: /api/errors/51c8d23ce6e33323. Report an issue: GitHub.