ShutdownWatchdogSec does not work as described

[prashantkumardhotre@xxxxxxxxx (prashantkumar dhotre)]

Hi
I am observing that  ShutdownWatchdogSec   setting in  system.conf

In man page, for ShutdownWatchdogSec    , I see :
" It works as a safety net to ensure that the reboot takes place even if a
clean reboot attempt times out. "
I am not clear what is meant by 'clean reboot' and 'times out ' here

For testing, I have set it to 5 sec

++++++++++++++++++++++++++++++
root at re1:~# grep ShutdownWatchdogSec /etc/systemd/system.conf
ShutdownWatchdogSec=5sec
root at re1:~#
++++++++++++++++++++++++++++++


and I have my.service , which on stop will sleep for few minutes

++++++++++++++++++++++++++++++
# cat /etc/systemd/system/my.service
[Unit]
Description="my"

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/true
ExecStopPost=/bin/sleep 3000
Restart=no

[Install]
WantedBy=multi-user.target
++++++++++++++++++++++++++++++

But I dont see hardware watchdog being kicked in.
Is this a bug in ShutdownWatchdogSec ? if not am I missing any config ?

I did some research and found below links which talk about effect of
ShutdownWatchdogSec .

https://utcc.utoronto.ca/~cks/space/blog/linux/SystemdNFSMountShutdown
https://utcc.utoronto.ca/~cks/space/blog/linux/SystemdShutdownWatchdog

as described in above pages, one option seem to be to lower value of
JobTimeoutSec
<https://www.freedesktop.org/software/systemd/man/systemd.unit.html> in
reboot.target but that solution is still about software watchdog and not
about hardware watchdog.


My requirement is to put upper bound time limit of reboot, and once upper
limit is reached, i want to kick in hardware watchdog

Could you please let me know how do I achieve this ?

Thanks
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