Bug#898648: ProLiant DL380 Gen9 takes forever to reboot

[Ivan Sergio Borgonovo <ivan.s.b@gmail.com>]

Package: linux-image-4.15.0-3-amd64
Version: 4.15.17-1

after running

reboot

machine start shutdown and hangs several minutes with this message on 
console

hpwdt: Unxpected close, not stopping watchdog!

Fans go to maximum speed and machine freeze for several minutes before 
rebooting.
Freezing time are not constant (from 5 extra minutes to over 10 minutes).

Same problem with
linux-image-4.16.0-1-amd64
4.16.5-1

I had to revert to
linux-image-4.14.0-3-amd64
4.14.17-1

thanks

--
Ivan Sergio Borgonovo
https://www.webthatworks.it https://www.borgonovo.net