During reboot or kexec, watchdog will be setup before systemd is
replaced by systemd-shutdown binary. But while systemd-shutdown is
executed, the watchdog will not really be released. Log shown as
following:
[ 39.371202] watchdog: watchdog0: watchdog did not stop!
[ 39.383659] systemd-shutdown[1]: Syncing filesystems and block
devices.
[ 39.423727] systemd-shutdown[1]: Sending SIGTERM to remaining
processes...
[ 39.440857] systemd-journald[526]: Received SIGTERM from PID 1
(systemd-shutdow).
[ 39.461047] systemd-shutdown[1]: Sending SIGKILL to remaining
processes...
[ 39.466736] systemd-shutdown[1]: Using hardware watchdog 'iTCO_wdt',
version 0, device /dev/watchdog
[ 39.467835] systemd-shutdown[1]: Unmounting file systems.
[ 39.469721] [2171]: Remounting '/' read-only in with options
'attr2,inode64,logbufs=8,logbsize=32k,noquota'.
[ 39.550266] systemd-shutdown[1]: All filesystems unmounted.
[ 39.550274] systemd-shutdown[1]: Deactivating swaps.
[ 39.550443] systemd-shutdown[1]: All swaps deactivated.
[ 39.550449] systemd-shutdown[1]: Detaching loop devices.
[ 39.550697] systemd-shutdown[1]: All loop devices detached.
[ 39.550703] systemd-shutdown[1]: Detaching DM devices.
[ 39.551269] systemd-shutdown[1]: Not all DM devices detached, 1
left.
[ 39.551277] systemd-shutdown[1]: Cannot finalize remaining DM
devices, continuing.
[ 39.580044] systemd-shutdown[1]: Successfully changed into root
pivot.
[ 39.580050] systemd-shutdown[1]: Returning to initrd...
[ 39.587921] watchdog: watchdog0: watchdog did not stop!
[ 39.774130] dracut Warning: Break before pre-shutdown
after applying fix
[ 59.520379] watchdog: watchdog0: watchdog did not stop!
[ 59.542286] systemd-shutdown[1]: Syncing filesystems and block
devices.
[ 59.583313] systemd-shutdown[1]: Sending SIGTERM to remaining
processes...
[ 59.600133] systemd-journald[517]: Received SIGTERM from PID 1
(systemd-shutdow).
[ 59.624435] systemd-shutdown[1]: Sending SIGKILL to remaining
processes...
[ 59.629288] systemd-shutdown[1]: Using hardware watchdog
'iTCO_wdt', version 0, device /dev/watchdog
[ 59.630468] systemd-shutdown[1]: Unmounting file systems.
[ 59.632219] [2172]: Remounting '/' read-only in with options
'attr2,inode64,logbufs=8,logbsize=32k,noquota'.
[ 59.727588] systemd-shutdown[1]: All filesystems unmounted.
[ 59.727596] systemd-shutdown[1]: Deactivating swaps.
[ 59.727719] systemd-shutdown[1]: All swaps deactivated.
[ 59.727725] systemd-shutdown[1]: Detaching loop devices.
[ 59.727974] systemd-shutdown[1]: All loop devices detached.
[ 59.727979] systemd-shutdown[1]: Detaching DM devices.
[ 59.728547] systemd-shutdown[1]: Not all DM devices detached, 1
left.
[ 59.728556] systemd-shutdown[1]: Cannot finalize remaining DM
devices, continuing.
[ 59.758160] systemd-shutdown[1]: Successfully changed into root
pivot.
[ 59.758167] systemd-shutdown[1]: Returning to initrd...
[ 59.950305] dracut Warning: Break before pre-shutdown