Bug#785714: kexec-tools is broken when using systemd, danger of filesystem corruption

[Jan Stattegger-Sievers]

Hi,

for the second time we ran into this problem and lost again data on
several servers. First time, we assumed a firmware update we ran before
the reboot to be the cause.

This time, there was no firmware update and we looked further into this,
knowing now this is no singular issue. And it turns out: On every kexec
reboot you will loose data, if your servers are doing a significant
amount of work shortly before the reboot, since no umount is done
before the new kernel kicks in.

This definitely needs a fix!

Since the proposed fix changes the behavior of reboot and shutdown -r I
am cc'ing systemd-sysv maintainers.

Regards,
Jan