BIND assertion failure - 9.10.4

[James Brown]

Upgraded to 9.10.4 a few days ago, and this morning it crashed:

03-May-2016 04:01:54.575 zone rpz.spamhaus.org/IN/internal: transferred serial 1462212030
03-May-2016 04:01:54.575 transfer of 'rpz.spamhaus.org/IN/internal' from 199.168.90.51#53: Transfer status: success
03-May-2016 04:01:54.575 transfer of 'rpz.spamhaus.org/IN/internal' from 199.168.90.51#53: Transfer completed: 1 messages, 287 records, 6102 bytes, 0.265 secs (23026 bytes/sec)
03-May-2016 04:02:54.337   validating ip6.arpa/SOA: got insecure response; parent indicates it should be secure
03-May-2016 04:02:54.342   validating ip6.arpa/SOA: got insecure response; parent indicates it should be secure
03-May-2016 04:04:07.863   validating ip6.arpa/SOA: got insecure response; parent indicates it should be secure
03-May-2016 04:04:07.867   validating ip6.arpa/SOA: got insecure response; parent indicates it should be secure
03-May-2016 04:04:22.862 rbt.c:2726: INSIST(sibling != ((void*)0)) failed, back trace
03-May-2016 04:04:22.870 #0 0x10fe743b7 in isc_thread_yield()+0xfc5f027
03-May-2016 04:04:22.872 #1 0x11003671a in isc_thread_yield()+0xfe2138a
03-May-2016 04:04:22.872 #2 0x10ff2434e in isc_thread_yield()+0xfd0efbe
03-May-2016 04:04:22.872 #3 0x10ff3354f in isc_thread_yield()+0xfd1e1bf
03-May-2016 04:04:22.872 #4 0x10ff32b10 in isc_thread_yield()+0xfd1d780
03-May-2016 04:04:22.873 #5 0x10ff323f1 in isc_thread_yield()+0xfd1d061
03-May-2016 04:04:22.873 #6 0x10ff2cfee in isc_thread_yield()+0xfd17c5e
03-May-2016 04:04:22.873 #7 0x10ffa8217 in isc_thread_yield()+0xfd92e87
03-May-2016 04:04:22.873 #8 0x11005a649 in isc_thread_yield()+0xfe452b9
03-May-2016 04:04:22.873 #9 0x7fff9b19799d in isc_thread_yield()+0x7ffe9af8260d
03-May-2016 04:04:22.873 #10 0x7fff9b19791a in isc_thread_yield()+0x7ffe9af8258a
03-May-2016 04:04:22.873 #11 0x7fff9b195351 in isc_thread_yield()+0x7ffe9af7ffc1
03-May-2016 04:04:22.873 exiting (due to assertion failure)

Running Mac OS X 10.11.4.

Have never had a problem with any previous version of BIND.

Hopefully it’s a one-off. Let me know if there is any more information I can provide.

Thanks,

James.