Can lock escalation in undo phase(db recovery)?

Hello everyone,

i have met a db undo situation ,which hold 18000000+ locks,about 3.4GB memory(totally 4gb physical memory).

So my question is :can lock escalation  in undo phase(db recovery) ,because redo thread hold locks beyond lock escalation threshold 5000,and the server's memory is low. 

and can lock escalation  in transaction rollback ?

thanks