Comment 5 for bug 350491

Forwarding from ubuntu:

1) Apply kernel update (but don't immediately reboot, as you're working)
2) have to move somewhere, hibernate laptop
3) power on laptop to restore from hibernate
4) since the hibernated image does not correspond to the current kernel version, the image will be discarded and a regular boot is done

Result: All data that hasn't been saved is lost, filesystems can be corrupted and need fsck. In severity this corresponds to a hard system crash.

proposed fix: boot old kernel if hibernate exists or prevent hibernation when a new kernel version has been installed.