This is a bug in the upstream code, so your best chance of getting it fixed is
to report the problem to upsteam.
http://www.nlnetlabs.nl/labs/bugs/
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https://bugs.launchpad.net/bugs/81781
Public bug reported:
num-threads set to 1 disables threading, setting to 0 causes a segfault
rather than the config parser flagging it as an error.
** Affects: unbound (Ubuntu)
Importance: Undecided
Status: New
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