Fix list iteration

src/core/client_config/subchannel.c

@@ -597,7 +597,7 @@ static void publish_transport(grpc_subchannel *c, grpc_call_list *call_list) {
   gpr_mu_unlock(&c->mu);
 
   while (w4c != NULL) {
-    waiting_for_connect *next = w4c;
+    waiting_for_connect *next = w4c->next;
     grpc_call_list_add(call_list, &w4c->continuation, 1);
     w4c = next;
   }

test/core/end2end/fixtures/proxy.c

@@ -100,6 +100,10 @@ grpc_end2end_proxy *grpc_end2end_proxy_create(
 
   gpr_join_host_port(&proxy->proxy_port, "localhost", proxy_port);
   gpr_join_host_port(&proxy->server_port, "localhost", server_port);
+
+  gpr_log(GPR_DEBUG, "PROXY ADDR:%s BACKEND:%s", proxy->proxy_port,
+          proxy->server_port);
+
   proxy->cq = grpc_completion_queue_create(NULL);
   proxy->server = def->create_server(proxy->proxy_port);
   proxy->client = def->create_client(proxy->server_port);
@@ -142,8 +146,6 @@ void grpc_end2end_proxy_destroy(grpc_end2end_proxy *proxy) {
 }
 
 static void unrefpc(proxy_call *pc, const char *reason) {
-  gpr_log(GPR_DEBUG, "unref %p: %s %d -> %d", pc, reason, pc->refs.count,
-          pc->refs.count - 1);
   if (gpr_unref(&pc->refs)) {
     grpc_call_destroy(pc->c2p);
     grpc_call_destroy(pc->p2s);
@@ -156,8 +158,6 @@ static void unrefpc(proxy_call *pc, const char *reason) {
 }
 
 static void refpc(proxy_call *pc, const char *reason) {
-  gpr_log(GPR_DEBUG, "ref %p: %s %d -> %d", pc, reason, pc->refs.count,
-          pc->refs.count + 1);
   gpr_ref(&pc->refs);
 }