Systemd: reboot --force does not actually reboot immediately
systemd version the issue has been seen with
245.5-3
Used distribution
Debian sid
Expected behaviour you didn't see
Actual reboot
Unexpected behaviour you saw
System freezing
Steps to reproduce the problem
run reboot --force
audunmg
All 3 comments
"reboot --force" just means we call the kernel's reboot() syscall, nothing else. If that freezes it's a bug in the kernel or firmware. There's nothing systemd can do about that. Please report to your kernel maintainers.
Sorry!
poettering
on 13 Jun 2020
wouldn't that be reboot -f -f ?
man page is not very clear...
boucman
on 13 Jun 2020
I should elaborate.
reboot -f does not reboot, nor does it freeze the system.
It is still responsive as if nothing happened except the terminal doing the reboot -f is frozen.
So no reboot() system call is called, something else happens.
For future reference, echo b > /proc/sysrq-trigger works as a workaround and instantly reboots the system.
audunmg
on 13 Jun 2020
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Most helpful comment
I should elaborate.
reboot -f does not reboot, nor does it freeze the system.
It is still responsive as if nothing happened except the terminal doing the reboot -f is frozen.
So no reboot() system call is called, something else happens.
For future reference,
echo b > /proc/sysrq-triggerworks as a workaround and instantly reboots the system.