Merge pull request #10015 from rjshade/use_after_free

Fix flaky use-after-free in udp_server

src/core/lib/iomgr/udp_server.c

@@ -485,7 +485,11 @@ void grpc_udp_server_start(grpc_exec_ctx *exec_ctx, grpc_udp_server *s,
                       grpc_schedule_on_exec_ctx);
     grpc_fd_notify_on_write(exec_ctx, sp->emfd, &sp->write_closure);
 
-    s->active_ports++;
+    /* Registered for both read and write callbacks: increment active_ports
+     * twice to account for this, and delay free-ing of memory until both
+     * on_read and on_write have fired. */
+    s->active_ports += 2;
+
     sp = sp->next;
   }
 

gflags @ f8a0efe0

-Subproject commit 30dbc81fb5ffdc98ea9b14b1918bfe4e8779b26e
+Subproject commit f8a0efe03aa69b3336d8e228b37d4ccb17324b88