In 5.5 all the current buf_flush_remove() callers hold the LRU list mutex. This bug only occurred when buf_flush_ready_for_flush() called buf_flush_remove(), and this has been fixed with the lazy drop table feature removal.
In 5.5 all the current buf_flush_remove() callers hold the LRU list mutex. This bug only occurred when buf_flush_ ready_for_ flush() called buf_flush_remove(), and this has been fixed with the lazy drop table feature removal.