Release 2.4.3 debdiff.

** Description changed:

- Am running an HA MAAS, but every few days named gets stuck on one of the
- region controllers.
+ [Impact]
  
- systemd thinks the service is running, but it doe not respond to any
+  * systemd thinks the service is running, but it does not respond to any
  commands or requests. Also, it doesn't respond to signals other than
  kill -9. service restarts hang, rndc hangs.
  
- I have attached logs and a core dump of named.
+  * being that the deadlock is in bind9 that ships in bionic the issue
+ needs to be backported to 2.4.3 so MAAS from the archive in bionic can
+ handle the deadlock and get bind9 unstuck.
+ 
+  * change in MAAS watches for this case to occur with bind9, then MAAS
+ will force kill the service and restart it.
+ 
+ [Test Case]
+ 
+  * very hard to reproduce but the issue occurs when bind9 deadlocks, it
+ response to nothing over the network or rndc. SIGTERM does not kill it
+ only SIGKILL works to force kill the process and get systemd to restart
+ it.
+ 
+ 
+ [Regression Potential] 
+ 
+  * possible that bind9 will not be started correctly or possible that
+ bind9 will be placed into a forever restart loop

** Patch added: "maas_2.4.3.debdiff"
   
https://bugs.launchpad.net/maas/+bug/1710278/+attachment/5302068/+files/maas_2.4.3.debdiff

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https://bugs.launchpad.net/bugs/1710278

Title:
  [2.3a1] named stuck on reload, DNS broken

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