>  I've tried to figured out at what point during system startup the messages
>  start to appear by manually invoking all scripts in "/etc/rc.d". The
>  messages start to appear when "/etc/rc.d/savecore" is run. They stop
>  as soon as I abort the script.

does it happen only when you have a dump to save,
or does it happen even after savecore -c?
can you trigger it by dd with bs=1m?

YAMAMOTO Takashi