[Core] Fix deadlock in accelerated DAG channel read (#46288)

Signed-off-by: Jack Humphries <1645405+jackhumphries@users.noreply.github.com>

src/ray/core_worker/experimental_mutable_object_manager.cc

@@ -285,14 +285,15 @@ Status MutableObjectManager::ReadAcquire(const ObjectID &object_id,
         "Channel has not been registered (cannot get semaphores)");
   }
 
+  std::unique_ptr<plasma::MutableObject> &object = channel->mutable_object;
   // Check whether the channel has an error set before checking that we are the only
   // reader. If the channel is already closed, then it's OK to ReadAcquire and
   // ReadRelease in any order.
-  std::unique_ptr<plasma::MutableObject> &object = channel->mutable_object;
-  RAY_RETURN_NOT_OK(object->header->CheckHasError());
-  // The channel is still open. This lock ensures that there is only one reader
-  // at a time. The lock is released in `ReadRelease()`.
-  channel->lock->lock();
+  do {
+    RAY_RETURN_NOT_OK(object->header->CheckHasError());
+    // The channel is still open. This lock ensures that there is only one reader
+    // at a time. The lock is released in `ReadRelease()`.
+  } while (!channel->lock->try_lock());
   channel->reading = true;
 
   int64_t version_read = 0;