Error on auto execute of job SYS.ORA$_AT_SA_SPC_SY (external link)

Today I've got a ticket to service with the content more or less like the following:

ORA-12012: error on auto execute of job "SYS"."ORA$AT_SA_SPC_SY_1202"
ORA-20000: ORU-10027: buffer overflow, limit of 20000 bytes
ORA-06512: at "SYS.DBMS_ADVISOR", line 201
ORA-06512: at "SYS.DBMS_SPACE", line 2480
ORA-06512: at "SYS.DBMS_SPACE", line 2553

The issue is not a big deal for me - a problem with space advisor is not a critical thing IMHO, but by the way I found short nice notice on the subject http://qdosmsq.dunbar-it.co.uk/blog/2013/01/oraat_sa_spc_sy-jobs-failing/