Awesome investigation and bug fix from _az


In this thread, @_az and @mnordhoff investigated a perplexing problem someone was having with SERVFAILs. @_az not only diagnosed the specific problem, but put together a detailed bug report for Unbound. As of today, the Unbound maintainer (Wouter Wijngaards) has confirmed the issue and patched it.

Great work @_az, thanks so much for working on this!