[Bug 247950] databases/lmdb: lmdb-0.9.24_2,1 causes problems with bind dynamic zones after reload

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247950

            Bug ID: 247950
           Summary: databases/lmdb: lmdb-0.9.24_2,1 causes problems with
                    bind dynamic zones after reload
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: delphij at FreeBSD.org
          Reporter: david at isnic.is
          Assignee: delphij at FreeBSD.org
             Flags: maintainer-feedback?(delphij at FreeBSD.org)

Since lmdb-0.9.24_2,1 bind with dynamic zones has problems after HUP. This
happens in our setup every night when newsyslog runs. It seems the fix in
#244493 may have issues.

Steps to reproduce:
* Install bind (bind911 and bind916 both tested)
* Add "allow-new-zones yes;" under options section of
/usr/local/etc/namedb/named.conf
* service named restart
* kill -HUP `cat /var/run/named/pid`
* rndc -k /usr/local/etc/namedb/rndc.key addzone 'example.org {type slave;
masters { 127.0.0.1;}; file "/usr/local/etc/namedb/slave/example.org";};'
* Check /var/log/messages, find errors like:
  Jul 13 14:05:57 davidtest named[74867]: mdb_txn_begin: Invalid argument
  Jul 13 14:05:57 davidtest named[74867]: mdb_txn_begin: Invalid argument

We've downgraded to lmdb-0.9.24_1,1 which does not have this problem.

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