I encountered an issue where the mongoc_cursor_destroy function is not able to destroy a cursor. I attached a file with a small c program that demonstrates the issue. You need to replace the uri_string, db_name & collection_name so they are valid for your system. The issue only occurs when the collection has more than 100 elements.

The crucial part in the attached c program is the following:

mongoc_client_command_with_opts(client, db_name, command, NULL, NULL, &reply, &error);
cursor = mongoc_cursor_new_from_command_reply_with_opts(client, &reply, NULL);
mongoc_cursor_destroy(cursor);

The cursor returned from mongoc_cursor_new_from_command_reply_with_opts has a non zero cursor_id and a server_id which is zero.

This leads to the failure of BSON_ASSERT(server_id) during the destruction of the cursor inside mongoc_cluster_stream_for_server() in mongoc-cluster.c.

The log output is the following:

/build/mongo-c-driver-RRvvb_/mongo-c-driver-1.16.1/src/libmongoc/src/mongoc/mongoc-cluster.c:1913 mongoc_cluster_stream_for_server(): precondition failed: server_id
Aborted