BIND stopping/starting - unknown control channel command sync


since some days (or a week) I have problems with BIND stopping and restarting - sometimes within minutes.
Today BIND stopped and started already 70 times.

The logs show a unknown control channel command 'sync ':

received control channel command ‘sync DOMAIN.COM

unknown control channel command ‘sync DOMAIN.COM

received control channel command ‘stop -p’

shutting down: flushing changes

stopping command channel on

no longer listening on ::#53

no longer listening on

no longer listening on

no longer listening on —.---.—.---#53


starting BIND 9.8.1-P1 -u bind

built with ‘–prefix=/usr’ ‘–mandir=/usr/share/man’ ‘–infodir=/usr/share/info’ ‘–sysconfdir=/etc/bind’ ‘–localstatedir=/var’ ‘–enable-threads’ ‘–enable-largefile’ ‘–with-libtool’ ‘–enable-shared’ ‘–enable-static’ ‘–with-openssl=/usr’ ‘–with-gssapi=/usr’ ‘–with-gnu-ld’ ‘–with-geoip=/usr’ ‘–enable-ipv6’ ‘CFLAGS=-fno-strict-aliasing -DDIG_SIGCHASE -O2’ ‘LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro’ ‘CPPFLAGS=-D_FORTIFY_SOURCE=2’

We assume that it could arise from an Webmin/Virtualmin update which is adressing the new command ‘sync’ (as we had all updates installed automatically - changed now to security updates only).

BIND version 9.8.1

Webmin version 1.890

Virtualmin version 6.03

Ubuntu Linux 12.04.1

Kernel and CPU Linux 2.6.32-40-pve on x86_64

Has anybody the same problems or give us a hintz how to fix this?