Hello,
      
      when doing a simple search through the lucene indexes in some
      mailboxes (with actually many subfolders) the search terminates
      after a few seconds with no result and the dovecot log shows this
      error:
      
      Fatal: master: service(imap): child 15433 killed with signal 6
      (core not dumped)
      
      
      Any clue about the reasons? the lucene indexes have been already
      rebuilt and look OK.
      
      
      
      Regards
      
      -federico