[Bug network/19791] res_query.c:262 asserts when dns contains unreachable entries

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19791

--- Comment #9 from Florian Weimer <fweimer at redhat dot com> ---
Thanks.  I can reproduce it now.  I was running the test against the name
server from the reproducer, not a real-world nameserver.  I have not found the
root cause yet, though.

From what I can tell, the resolver is pretty much unusable in this
configuration (IPv6 addresses disabled, IPv6 name server configured). 
Supposedly successful DNS lookups do not return any data, and NXDOMAIN/NODATA
responses result in the reported assertion failure.  Does this match what you
see?

I assume you discovered this right after applying the patch because everything
stopped working.  Or was the failure more subtle?

(I'm asking these questions to determine if this constitutes a security bug in
its own right, rather than a regression exposed by a security fix.)

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