Take another shot at stability in this case

bin/varnishtest/tests/c00034.vtc

@@ -116,7 +116,7 @@ varnish v1 -expect s_resp_bodybytes == 401
 
 # Test Range streaming with streaming objects with C-L
 
-server s1 -repeat 2 {
+server s1 {
 	rxreq
 	txresp -nolen -hdr "Content-Length: 100"
 	send "0123456789"
@@ -130,6 +130,20 @@ server s1 -repeat 2 {
 	sema r1 sync 2
 	send "0123456789"
 	send "0123456789"
+
+	rxreq
+	txresp -nolen -hdr "Content-Length: 100"
+	send "0123456789"
+	send "0123456789"
+	send "0123456789"
+	send "0123456789"
+	send "0123456789"
+	send "0123456789"
+	send "0123456789"
+	send "0123456789"
+	sema r2 sync 2
+	send "0123456789"
+	send "0123456789"
 } -start
 
 varnish v1 -vcl+backend {
@@ -166,7 +180,7 @@ client c1 {
 	expect resp.status == 206
 	expect resp.http.Content-Range == "bytes 2-5/*"
 	expect resp.http.Content-Length == 4
-	sema r1 sync 2
+	sema r2 sync 2
 	recv 4
 	expect_close
 } -run