debug 1: received control channel command 'null' - linked to amazon.de zone problem?

[James Patterson]

The recursive dns server for my home network keeps crashing. There is
nothing in the logs, so I upped the log severity to debug. I see this:

16-Jan-2015 09:46:44.314 general: debug 1: received control channel
command 'null'
16-Jan-2015 09:46:44.319 general: info: received control channel command
'stop -p'
16-Jan-2015 09:46:44.320 general: info: shutting down: flushing changes
16-Jan-2015 09:46:44.323 general: notice: stopping command channel on
127.0.0.1#953
16-Jan-2015 09:46:44.323 general: notice: stopping command channel on
::1#953
16-Jan-2015 09:46:44.351 network: info: no longer listening on ::#53
16-Jan-2015 09:46:44.352 network: info: no longer listening on
127.0.0.1#53
16-Jan-2015 09:46:44.353 database: debug 1: calling free_rbtdb(.)
16-Jan-2015 09:46:44.353 database: debug 1: done free_rbtdb(.)
16-Jan-2015 09:46:44.354 database: debug 1: calling free_rbtdb(.)
16-Jan-2015 09:46:44.355 database: debug 1: done free_rbtdb(.)
16-Jan-2015 09:46:44.355 database: debug 1: calling
free_rbtdb(0.in-addr.arpa)
16-Jan-2015 09:46:44.356 database: debug 1: done
free_rbtdb(0.in-addr.arpa)
16-Jan-2015 09:46:44.356 database: debug 1: calling
free_rbtdb(127.in-addr.arpa)
16-Jan-2015 09:46:44.356 database: debug 1: done
free_rbtdb(127.in-addr.arpa)
16-Jan-2015 09:46:44.357 database: debug 1: calling
free_rbtdb(255.in-addr.arpa)
16-Jan-2015 09:46:44.357 database: debug 1: done
free_rbtdb(255.in-addr.arpa)
16-Jan-2015 09:46:44.377 database: debug 1: calling free_rbtdb(.)
16-Jan-2015 09:46:44.378 database: debug 1: done free_rbtdb(.)
16-Jan-2015 09:46:44.391 database: debug 1: calling free_rbtdb(.)
16-Jan-2015 09:46:44.392 database: debug 1: done free_rbtdb(.)
16-Jan-2015 09:46:44.393 database: debug 1: calling free_rbtdb(.)
16-Jan-2015 09:46:44.396 database: debug 1: adjust_quantum -> 295
16-Jan-2015 09:46:44.397 database: debug 1: calling
free_rbtdb(localhost)
16-Jan-2015 09:46:44.398 database: debug 1: done free_rbtdb(localhost)
16-Jan-2015 09:46:44.407 database: debug 1: done free_rbtdb(.)
16-Jan-2015 09:46:44.424 general: notice: exiting

Then I have to restart it. It keeps happening.

I think it's related to a SERVFAIL I keep seeing:

debug 1: client 10.8.0.6#50541: query failed (SERVFAIL) for
www.amazon.de/IN/A at query.c:7002

squish.net finds a few problems with www.amazon.de:
 14.6% maxdepth
3% resulted in an exception

Running bind 1:9.8.4.dfsg.P1-6+nmu2+deb7u3 rpi

Anyone know what's going on?

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