[Bug 1710278] [NEW] [2.3a1] named stuck on reload, DNS broken

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Blake Rouse (blake-rouse):

[Impact]

 * 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.

 * 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

** Affects: bind
     Importance: Undecided
         Status: New

** Affects: maas
     Importance: Critical
     Assignee: Blake Rouse (blake-rouse)
         Status: Fix Committed

** Affects: maas/2.2
     Importance: Critical
     Assignee: Blake Rouse (blake-rouse)
         Status: Fix Released

** Affects: maas/2.4
     Importance: Undecided
     Assignee: Blake Rouse (blake-rouse)
         Status: Fix Committed

** Affects: maas/2.6
     Importance: Critical
     Assignee: Blake Rouse (blake-rouse)
         Status: Fix Released

** Affects: maas/2.7
     Importance: Critical
     Assignee: Blake Rouse (blake-rouse)
         Status: Fix Committed

** Affects: bind9 (Ubuntu)
     Importance: Medium
         Status: In Progress

** Affects: maas (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: bind9 (Ubuntu Xenial)
     Importance: Medium
         Status: In Progress

** Affects: bind9 (Ubuntu Bionic)
     Importance: Medium
         Status: In Progress

** Affects: maas (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Blake Rouse (blake-rouse)
         Status: In Progress

** Affects: bind9 (Ubuntu Disco)
     Importance: Medium
         Status: In Progress

** Affects: bind9 (Ubuntu Eoan)
     Importance: Medium
         Status: In Progress


** Tags: sts
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[2.3a1] named stuck on reload, DNS broken
https://bugs.launchpad.net/bugs/1710278
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