Dear Ian,
Am 10.08.25 um 19:48 schrieb Ian Pilcher:
I'm playing around, trying to use 'systemctl kexec' for faster reboots.
Thus far, I haven't been able to get it to work; I'm always getting a
"normal" reboot (including the firmware POST).
My system (Fedora 42) is using UEFI boot, with secure boot disabled.
systemd-boot is the bootloader.
$ sudo bootctl --no-pager
System:
Firmware: UEFI 2.40 (American Megatrends 5.10)
Firmware Arch: x64
Secure Boot: disabled (setup)
TPM2 Support: no
Measured UKI: no
Boot into FW: supported
Current Boot Loader:
Product: systemd-boot 257.7-1.fc42
Features: ✓ Boot counting
✓ Menu timeout control
✓ One-shot menu timeout control
✓ Default entry control
✓ One-shot entry control
✓ Support for XBOOTLDR partition
✓ Support for passing random seed to OS
✓ Load drop-in drivers
✓ Support Type #1 sort-key field
✓ Support @saved pseudo-entry
✓ Support Type #1 devicetree field
✓ Enroll SecureBoot keys
✓ Retain SHIM protocols
✓ Menu can be disabled
✓ Multi-Profile UKIs are supported
✓ Boot loader set partition information
Partition: /dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0
Loader: └─/EFI/SYSTEMD/SYSTEMD-BOOTX64.EFI
[…]
I don't see any obviously fatal errors when I do a dry run.
$ sudo SYSTEMD_LOG_LEVEL=debug systemctl --dry-run kexec
[…]
Would run /usr/sbin/kexec --load
"/efi/e74ab0d2949c479eb03abdab1b1acd41/6.15.9-201.fc42.x86_64/linux" --append
"root=/dev/mapper/vg_breadbox-lv_fedora ro rd.lvm.lv=vg_breadbox/lv_fedora elevator=deadline
intel_iommu=on systemd.machine_id=e74ab0d2949c479eb03abdab1b1acd41" --initrd
"/efi/e74ab0d2949c479eb03abdab1b1acd41/6.15.9-201.fc42.x86_64/initrd"
Would set wall message "".
Would execute org.freedesktop.login1.Manager RebootWithFlags dbus call.
Bus n/a: changing state RUNNING → CLOSED
Nonetheless, running 'systemctl kexec' is doing a normal reboot,
including the firmware POST.
Any pointers on how to troubleshoot this further would be appreciated.
What happens if you run the kexec command from above manually?
Kind regards,
Paul
