Hi Ralf,
sorry but the output of your shell wrapper is rather long.
Do I understand it right that "time /usr/bin/host 
209.73.175.193.dnsbl.njabl.org" gives you a segfault at 100% of the tries? 
Before you said time to time, so should we loop over it to see if one out of 
many reproduces this?

If it has crashed with a segfault you should find them in /var/crash,
and can report them with apport-collect to add them to this bug.

If you happen to know - Is this a new behavior due to an update?

I see that newer versions report "2(SERVFAIL)" while the precise version
does (as in your post) "3(NXDOMAIN)"

Since only the first is slow I ran 1000 with the following loop but could not 
reproduce:
for i in $(seq 1 1000); do time /usr/bin/host 209.73.175.193.dnsbl.njabl.org; 
done

** Changed in: bind9 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1685449

Title:
  host[47240]: segfault at 1f ip 00007f8c5a00db0c sp 00007f8c56bf7e20
  error 6 in host.orig[7f8c5a001000+1a000]

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