I disabled dnssec validation, and after a few days with a number of reboots and restarts of bind9, I haven't had any further trouble with stopping the bind9 service or with shutting down my system. So I'm pretty sure at this point that there's some bug with dnssec validation that intermittent prevents bind9 from shutting down properly.
I disabled dnssec validation, and after a few days with a number of reboots and restarts of bind9, I haven't had any further trouble with stopping the bind9 service or with shutting down my system. So I'm pretty sure at this point that there's some bug with dnssec validation that intermittent prevents bind9 from shutting down properly.