BIND 10 #3074: kea6 fails to start after repeated start/stop

[BIND 10 Development]

#3074: kea6 fails to start after repeated start/stop
-------------------------------------+-------------------------------------
            Reporter:  wlodekwencel  |                         Type:
              Status:  new           |  defect
           Milestone:  New Tasks     |                     Priority:
            Keywords:  kea6 config   |  medium
           Sensitive:  0             |                    Component:  bind-
         Sub-Project:  Core          |  ctl
Estimated Difficulty:  0             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Kea6 fail to start after exactly 108 start/stop procedure.

 each Forge test sets new Kea6 configuration as follows:
 1. stop
 config remove Init/components b10-dhcp6
 config commit
 Dhcp6 shutdown

 2. start fresh
 config add Init/components b10-dhcp6
 config set Init/components/b10-dhcp6/kind dispensable
 config commit

 3. config (e.g)
 config add Dhcp6/subnet6
 config set Dhcp6/subnet6[0]/subnet "2001:db8:1::/64"
 config set Dhcp6/subnet6[0]/pool [ "2001:db8:1::0 - 2001:db8:1::ffff" ]
 config commit

 after exactly 108 start/stop procedures, it fails on stop (every time on
 stop)
 bindctl stdout:
 Error: [Errno 32] Broken pipe
 Configuration not committed
 "Shutting down."
 bind log:
 ERROR [b10-cmdctl.cmdctl/7827] CMDCTL_COMMAND_ERROR error in command
 set_config to module ConfigManager: [Errno 32] Broken pipe
 INFO  [b10-dhcp6.dhcp6/12922] DHCP6_SHUTDOWN server shutdown
 INFO  [b10-init.init/7820] BIND10_PROCESS_ENDED process 12922 of b10-dhcp6
 ended with status 0

 after that any attempt to start/stop/change configure of kea6 fails with
 info:
 INFO  [b10-init.init/7820] BIND10_CONFIGURATOR_RECONFIGURE reconfiguring
 running components

 it seems related to #2757

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Ticket URL: <http://bind10.isc.org/ticket/3074>
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BIND 10 Development