auth-zones and DNS NOTIFY

[Harry Schmalzbauer]

Am 17.04.2018 um 15:26 schrieb W.C.A. Wijngaards via Unbound-users:
> Hi Harry,
>
> Yes, DNS NOTIFY is implemented in the current code repo version.  You
> can specify additional sources with allow-notify.

Great, thanks a lot!.
Found time to update some production systems, but unfortunately zone 
transfer seem to work only initially, then I see these messages logged:
unbound: [14927:0] error: ./services/authzone.c at 6102 could not 
pthread_mutex_lock(&xfr->lock): Resource deadlock avoided
unbound: [14927:0] error: ./services/authzone.c at 3454 could not 
pthread_mutex_lock(&xfr->lock): Resource deadlock avoided
…

Increasing log level to 3 doesn't show more useful.

After the error occurs, unbound returns "error response SERVFAIL" for 
all queries which match stub-zones: and all quieries matching 
auth-zones: get the old records (no xfer any more).

Any idea where the problem could come from?
Will try to make all stub-zones auth-zones and see if that changes 
anything....

Thanks,

-Harry