INSIST error from BIND 9.9.9-P6

[Mark Andrews]

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In message <20170420.135455.1218746118721348152.he at uninett.no>, Havard Eidnes writes:
> Hi,
> 
> one of our recursive resolvers running BIND 9.9.9-P6 stopped last
> night, in the log I find:
> 
> Apr 19 22:26:30 xxxx named[14737]: resolver.c:4751: INSIST(fctx->type =3D=
> =3D ((dns_rdatatype_t)dns_rdatatype_any) || fctx->type =3D=3D ((dns_rdataty=
> pe_t)dns_rdatatype_rrsig) || fctx->type =3D=3D ((dns_rdatatype_t)dns_rdatat=
> ype_sig)) failed, back trace
> Apr 19 22:26:30 xxxx named[14737]: #0 0x416078 in assertion_failed()+0x43
> Apr 19 22:26:30 xxxx named[14737]: #1 0x5934f6 in isc_assertion_failed()+0xa
> Apr 19 22:26:30 xxxx named[14737]: #2 0x519059 in validated()+0xdeb
> Apr 19 22:26:30 xxxx named[14737]: #3 0x5b13cd in run()+0x294
> Apr 19 22:26:30 xxxx named[14737]: #4 0x7f7ff6e0ac1c in _fini()+0x7f7ff682d=
> 36c
> Apr 19 22:26:30 xxxx named[14737]: #5 0x7f7ff5a83ce0 in _fini()+0x7f7ff54a6=
> 430
> Apr 19 22:26:30 xxxx named[14737]: exiting (due to assertion failure)
> 
> We run dnscap on this host, so I can see the last query which was
> answered and the first query which arrived which wasn't answered.
> 
> The last answered query was
> 
> A? 40.courier-push-apple.com.akadns.net.
> 
> The answer was some 576 bytes long, tcpdump said
> 
> 60846 9/10/8 CNAME pop-eur-scan-courier.push-apple.com.akadns.net., A 17.25=
> 2.108.23, A 17.252.108.11, A 17.252.108.28, A 17.252.108.19, A 17.252.108.8=
> , A 17.252.108.25, A 17.252.108.14, A 17.252.108.15 (576)
> 
> The first query which arrived afterwards and wasn't answered was
> 
> A? pltrd001.oam.uninett.no.
> 
> That's in an unsecure zone sitting below a DNSSEC-signed zone.  I
> checked, and that query had been sent and answered a few seconds
> earlier with a TTL of around 1000s, so it probably isn't related
> to cache expiry of this particular record.
> 
> Any ideas?
> 
> - H=E5vard
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org