This bug was fixed in the package systemd - 245.4-4ubuntu3.23
---------------
systemd (245.4-4ubuntu3.23) focal; urgency=medium
[ Nick Rosbrook ]
* core/device: ignore DEVICE_FOUND_UDEV bit on switching root (LP: #2037281)
File:
debian/patches/lp2037281-core-device-ignore-DEVICE_FOUND_UDEV-bit-on-switching-roo.patch
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=7793563bb38a84a3dc6bc0da1c08546c3b915ab8
* dns-query: bump CNAME_MAX to 16 (LP: #2024009)
File: debian/patches/lp2024009-dns-query-bump-CNAME_MAX-to-16.patch
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=193899d103d44c642d362e9916b14df844ec702f
* Fall back to kexec when no kexec binary exists (LP: #1969365)
File:
debian/patches/lp1969365-Fall-back-to-kexec-when-no-kexec-binary-exists.patch
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=3934f3794427dee4e72824998dd4c6e6d5875289
* test: ignore LXC filesystem when checking for writable locations (LP:
#2029352)
File:
debian/patches/lp2029352-test-ignore-LXC-filesystem-when-checking-for-writable-loc.patch
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=70facbfbf54c4ffb31ba392dbe3fec3084fdf3bc
[ Heitor Alves de Siqueira ]
* core/mount: adjust deserialized state based on /proc/self/mountinfo (LP:
#1837227)
Author: Heitor Alves de Siqueira
File:
debian/patches/lp1837227-core-mount-adjust-deserialized-state-based-on-proc-self-m.patch
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=a0a749953d309f48bc45140102adf205d1071c4d
-- Nick Rosbrook <en...@ubuntu.com> Tue, 21 Nov 2023 16:10:21 -0500
** Changed in: systemd (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1969365
Title:
focal: backport kexec fallback patch
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Focal:
Fix Released
Bug description:
It would be great if focal's systemd could have
https://github.com/systemd/systemd/commit/71180f8e57f8fbb55978b00a13990c79093ff7b3
backported to it.
[Impact]
We have observed that kexec'ing to another kernel will fail as the
drive containing the `kexec` binary has been unmounted by the time
systemd attempts to do so, indicated in the console:
Starting Reboot via kexec...
[ 163.960938] shutdown[1]: (sd-kexec) failed with exit status 1.
[ 163.963463] reboot: Restarting system
[Test Plan]
1) Launch a 20.04 instance
2) `apt-get install kexec-tools`
3) In `/boot`, filling in whatever <cmdline> needed in your environment:
kexec -l vmlinuz --initrd initrd.img --append '<cmdline>'
4) `reboot`
(I have reproduced this in a single-disk VM, so I assume it reproduces
~everywhere: if not, `apt-get remove kexec-tools` before the `reboot`
could be used to emulate the unmounting.)
[Where problems could occur]
Users could inadvertently be relying on the current behaviour: if they
have configured their systems to kexec, they currently will be
rebooting normally, and this patch would cause them to start actually
kexec'ing.
[Other info]
We're currently maintaining a systemd tree with only this patch added
to focal's tree: this patch has received a bunch of testing from us in
focal.
This patch landed in v246, so it's already present in supported
releases later than focal.
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https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1969365/+subscriptions
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