Sanity checks for calls that were causing crashes

src/cpp/server/server.cc

@@ -287,12 +287,14 @@ void Server::Wait() {
 }
 
 void Server::PerformOpsOnCall(CallOpBuffer* buf, Call* call) {
-  static const size_t MAX_OPS = 8;
+  if (call->call()) {
-  size_t nops = MAX_OPS;
+    static const size_t MAX_OPS = 8;
-  grpc_op ops[MAX_OPS];
+    size_t nops = MAX_OPS;
-  buf->FillOps(ops, &nops);
+    grpc_op ops[MAX_OPS];
-  GPR_ASSERT(GRPC_CALL_OK ==
+    buf->FillOps(ops, &nops);
-             grpc_call_start_batch(call->call(), ops, nops, buf));
+    GPR_ASSERT(GRPC_CALL_OK ==
+               grpc_call_start_batch(call->call(), ops, nops, buf));
+  }
 }
 
 class Server::AsyncRequest GRPC_FINAL : public CompletionQueueTag {
@@ -343,7 +345,9 @@ class Server::AsyncRequest GRPC_FINAL : public CompletionQueueTag {
     }
     ctx_->call_ = call_;
     Call call(call_, server_, cq_);
-    ctx_->BeginCompletionOp(&call);
+    if (call_) {
+      ctx_->BeginCompletionOp(&call);
+    }
     // just the pointers inside call are copied here
     stream_->BindCall(&call);
     delete this;