RocksDB: Server Collapse with certain Queries

When doing Bulk Loads, RocksDB gets stuck with some scheduled bulk load events with "Creating sort index". Under normal circumstances, the procedure should execute in a couple of minutes, but at time of reporting, it has been running for nearly 6 hours without any result...

SET STATEMENT

      rocksdb_commit_in_the_middle = 1,

      max_statement_time = 10800

FOR

     CREATE OR REPLACE TABLE t_table

     AS

          SELECT [...]

And if I try to kill the query, it does not get killed, causing performance issues to the whole server, and forcing a serve shutdown.

Which could be the root cause?