[bind10-dev] RESLIB_RUNQ_FAIL failure callback - nameservers are unreachable

[Jeremy C. Reed]

2011-08-04 10:22:20.751 DEBUG [b10-resolver.reslib] RESLIB_DEEPEST did 
not find <2.48.20.149.in-addr.arpa. IN PTR> in cache, deepest delegation 
found is 20.149.in-addr.arpa.

2011-08-04 10:22:20.759 DEBUG [b10-resolver.reslib] RESLIB_NSAS_LOOKUP 
looking up nameserver for zone 20.149.in-addr.arpa. in the NSAS

2011-08-04 10:22:20.759 DEBUG [b10-resolver.nsas] NSAS_SEARCH_ZONE_NS 
searching NSAS for nameservers for zone 20.149.in-addr.arpa.

2011-08-04 10:22:20.759 DEBUG [b10-resolver.reslib] RESLIB_RUNQ_FAIL 
failure callback - nameservers are unreachable

Why unreachable? What specifically is unreachable?

This resulted in a SERVFAIL. Some problem in cache. Tcpdump showed zero 
traffic. When I restarted b10-resolver, the problem went away.