MERGEQUERIES consumes 100% CPU ?

Hello all ..

this week I installed new DNS Software on ~50 servers.
The software I use is exactly like https://andreasschulze.de/dns
( and https://andreasschulze.de/dns/djbdns/doit )

On some servers I noticed a high CPU load. There I disabled MERGEQUERIES.

Now I have again a Server where dnscache happily consumes 100% cpu.
( dont hurts, 3 cores are still available ...  )

I decided to _NOT_ restart the cache.
I run some command:

# strace -p 18637 2>&1 | tai64n | tai64nlocal > /tmp/dnscache.strace
http://postmaster.datev.de/dnscache/dnscache.strace

# cat run
http://postmaster.datev.de/dnscache/run

# ls -la env; cat env/*
http://postmaster.datev.de/dnscache/env

# top -b -n 5 -p 18637 > /tmp/top
http://postmaster.datev.de/dnscache/top

# dump_systeminfos
http://postmaster.datev.de/dnscache/systeminfo

# what_should_i_do
-bash: what_should_i_do: ask the mailinglist ;-)

Anybody may help ?
Last resort would be disabling MERGEQUERIES an all servers :-(

Thanks
Andreas

-- 
########################################################################
#
# Andreas Schulze
# https://andreasschulze.de
# 
# GnuPG Key-ID: A7DBA67F, https://andreasschulze.de/sca.asc
# GnuPG Fingerprint: 14C1 39A8 CE6D 6BE0 28C6 5652 03B5 6793 A7DB A67F
#
# $Id: .signature,v 1.3 2007-12-27 21:13:36 sca Exp $
########################################################################

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iJwEAQECAAYFAkoPxPkACgkQGXQ4Obkc43kGoQP/VgFjtTRLDrm/e34B3r01DSPH
I7w02fh3y2RDWxvsMGjyOlnFGhop6DuCkCh+Ls6RynrYko3AJm2GZ752SjiNsCOp
MzMSTgxlPxJm+uP94Ree1RfVyKEZV+C2qTEJc8r152uqzv11whfRrsixquqLxIhY
mcvmkjR46ZpGyLBJrsA=
=JAhs
-----END PGP SIGNATURE-----