Just let it complete signing the zone. This is done incrementally.
sig-signing-nodes <integer>;
sig-signing-signatures <integer>;
These control the number nodes processed and signatures generated per
increment.
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka at isc.org