Stopping a VIMAGE+Netgraph jail in 12.2 in the same way as it
did work with Rel. 11.4, crashes the kernel after 2 or 3 start/stop
iterations.
Specifically. this does not work:
exec.poststop = "/usr/sbin/ngctl shutdown ${ifname1l}:";
Also this new option from Rel.12 does not work either, it just
gives a few more iterations:
exec.release = "/usr/sbin/ngctl shutdown ${ifname1l}:";
What seems to work is adding a delay:
exec.poststop = "
sleep 2 ;
/usr/sbin/ngctl shutdown ${ifname1l}: ;
";
The big question now is: how long should the delay be?
This example did run a test with 100 start/stop iterations. But then,
on a loaded machine stopping a jail that had been running for a few
months, is an entirely different matter: in such a case the jail will
spend hours in "dying" state, while in this test the jid became
instantly free for restart.
In any case, as all this did work flawlessly with Rel. 11.4, there
is now something broken in the code, and should be fixed.
PMc