[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 #7 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to priyesh from comment #6)

> I see. Sorry I did not catch on to it from your earlier hints. Thanks for
> the explanation. I had this issue originally in 2.22 with the CVE-2015-7547
> patch so that's probably how the "((void *)0)" got in the error.

Okay, it was worth a shot.  We did receive some reports we finally attributed
to a libresolv.so.2 version mismatch.

> I confirm that this is an issue with 2.23 as well. Updating error message
> res_query.c:262: __libc_res_nquery: Assertion `(hp != NULL) && (hp2 !=
> NULL)' failed.
> Aborted

I still cannot reproduce this using your instructions.  Could you run the
reproducer (the C program) with “strace -o strace.log -s 500” and attach the
strace.log file, please?  Hopefully, I will be able to see where my system
behaves differently.

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