commit 105abe2f7a2e518afda9eb3bda5cceb60f6fd1b2
Author: Olivier Houchard <cognet@ci0.org>
Date:   Sun Oct 21 03:01:20 2018 +0200

    BUG/MEDIUM: h2: Close connection if no stream is left an GOAWAY was sent.
    
    When we're closing a stream, is there's no stream left and a goaway was sent,
    close the connection, there's no reason to keep it open.
    
    [wt: it's likely that this is needed in 1.8 as well, though it's unclear
     how to trigger this issue, some tests are needed]
    
    (cherry picked from commit 52b946686c28891a4359e9361676dc62af4fffad)
    Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/src/mux_h2.c b/src/mux_h2.c
index b1b039fe..6881302b 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -2540,7 +2540,7 @@ static void h2_detach(struct conn_stream *cs)
 	if (eb_is_empty(&h2c->streams_by_id) &&     /* don't close if streams exist */
 	    ((h2c->conn->flags & CO_FL_ERROR) ||    /* errors close immediately */
 	     (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
-	     (h2c->flags & H2_CF_GOAWAY_FAILED) ||
+	     (h2c->flags & (H2_CF_GOAWAY_FAILED | H2_CF_GOAWAY_SENT)) ||
 	     (!h2c->mbuf->o &&  /* mux buffer empty, also process clean events below */
 	      (conn_xprt_read0_pending(h2c->conn) ||
 	       (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid))))) {