Update returns FORMERR: ran out of space

[Stephane Bortzmeyer]

On Wed, Feb 24, 2010 at 10:18:31AM +0100,
 Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote 
 a message of 39 lines which said:

> 24-Feb-2010 10:17:01.057 update: error: client ::1#45986: updating zone 'toto.fr/IN': RRSIG/NSEC/NSEC3 update failed: ran out of space

Adding a fair amount of debugging traces, I can get the line number:

24-Feb-2010 15:04:26.343 update: info: client ::1#60371: updating zone 'toto.fr/IN': error: ran out of space at line 1945

which, in my case, is:

/* Calculate the signature, creating a RRSIG RDATA. */
		CHECKV(dns_dnssec_sign(name, &rdataset, keys[i],
				      &inception, &expire,
				      mctx, &buffer, &sig_rdata));

So, the problem lies somewhere in dns_dnssec_sign but my knowledge
stops there.