Add some asserts to narrow #1147 and #1148 down

bin/varnishd/cache/cache_center.c

@@ -116,6 +116,7 @@ cnt_wait(struct sess *sp, struct worker *wrk, struct req *req)
 		SES_GetReq(sp);
 		req = sp->req;
 		CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
+		assert(req->sp == sp);
 		HTC_Init(req->htc, req->ws, sp->fd, sp->req->vsl,
 		    cache_param->http_req_size,
 		    cache_param->http_req_hdr_len);
@@ -928,6 +929,7 @@ DOT first -> wait [style=bold,color=green]
 static int
 cnt_first(struct sess *sp, struct worker *wrk)
 {
+	struct req *req;
 	char laddr[ADDR_BUFSIZE];
 	char lport[PORT_BUFSIZE];
 
@@ -936,8 +938,10 @@ cnt_first(struct sess *sp, struct worker *wrk)
 
 	/* Allocate a request already now, so we can VSL to it */
 	SES_GetReq(sp);
-	CHECK_OBJ_NOTNULL(sp->req, REQ_MAGIC);
-	HTC_Init(sp->req->htc, sp->req->ws, sp->fd, sp->req->vsl,
+	req = sp->req;
+	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
+	assert(req->sp == sp);
+	HTC_Init(req->htc, req->ws, sp->fd, req->vsl,
 	    cache_param->http_req_size,
 	    cache_param->http_req_hdr_len);
 
@@ -949,11 +953,11 @@ cnt_first(struct sess *sp, struct worker *wrk)
 		VTCP_name(&sp->mysockaddr, sp->mysockaddrlen,
 		    laddr, sizeof laddr, lport, sizeof lport);
 		/* XXX: have no req yet */
-		VSLb(sp->req->vsl, SLT_SessionOpen, "%s %s %s %s",
+		VSLb(req->vsl, SLT_SessionOpen, "%s %s %s %s",
 		    sp->addr, sp->port, laddr, lport);
 	} else {
 		/* XXX: have no req yet */
-		VSLb(sp->req->vsl, SLT_SessionOpen, "%s %s %s",
+		VSLb(req->vsl, SLT_SessionOpen, "%s %s %s",
 		    sp->addr, sp->port, sp->mylsock->name);
 	}
 

bin/varnishd/cache/cache_vcl.c

@@ -338,6 +338,8 @@ void									\
 VCL_##func##_method(struct req *req)					\
 {									\
 									\
+	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);				\
+	CHECK_OBJ_NOTNULL(req->sp, SESS_MAGIC);				\
 	req->handling = 0;						\
 	req->cur_method = VCL_MET_ ## upper;				\
 	VSLb(req->vsl, SLT_VCL_call, "%s", #func);			\