This bug was fixed in the package kexec-tools - 1:2.0.20-2.1ubuntu2
---------------
kexec-tools (1:2.0.20-2.1ubuntu2) groovy; urgency=medium
* Add finalrd integration hook, to allow kexec with finalrd. LP:
#1862300
-- Dimitri John Ledkov <x...@ubuntu.com> Thu, 10 Sep 2020 15:33:48
+0100
** Changed in: kexec-tools (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1862300
Title:
"systemctl kexec" reboots
Status in finalrd package in Ubuntu:
Won't Fix
Status in kexec-tools package in Ubuntu:
Fix Released
Bug description:
After the introduction of finalrd, "systemctl kexec" (with a kernel
preloaded by "kexec -l ...") no longer kexec()s -- it reboots instead.
Can be reproduced for example using a livecd (say, xubuntu-18.04
-desktop-amd64.iso):
sudo -i
apt-get update
apt-get install kexec-tools finalrd
systemctl start finalrd # optional
kexec -l /cdrom/casper/vmlinuz
systemctl kexec
Expected results: the system kexec's into the kernel and panics (due
to lack of /init, since we haven't given it an initrd).
Actual results: the system reboots (e.g. the livecd's bootloader menu
runs).
If we don't install "finalrd" above, kexec works normally.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/finalrd/+bug/1862300/+subscriptions
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