<div dir="ltr">Hi Ian,<div> </div><div>I've just tried on a fresh F42 VM and it seems to work correctly. </div><div> </div><div>Out of curiosity, what is the contents of /proc/sys/kernel/bootloader_type after unsuccessful kexec (i.e. normal reboot) in your case? </div><div> </div><div>Also can you make sure you don't have $SYSTEMCTL_SKIP_AUTO_KEXEC= variable set when calling systemctl reboot after manually loading kexec kernel.</div><div> </div><div>Michal</div><div> </div></div> <div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, Aug 10, 2025 at 7:49 PM Ian Pilcher <<a href="mailto:arequipeno@gmail.com">arequipeno@gmail.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">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 > Current Entry: e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf > > Random Seed: > System Token: set > Exists: yes > > Available Boot Loaders on ESP: > ESP: /efi (/dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0) > File: ├─/EFI/systemd/systemd-bootx64.efi (systemd-boot 257.7-1.fc42) > ├─/EFI/BOOT/BOOTX64.EFI (systemd-boot v245.8-2.fc32) > ├─/EFI/BOOT/fallback.efi > └─/EFI/BOOT/fbx64.efi > > Boot Loaders Listed in EFI Variables: > Title: Linux > ID: 0x0000 > Status: active, boot-order > Partition: /dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0 > File: └─/EFI/SYSTEMD/SYSTEMD-BOOTX64.EFI > > Title: Windows Boot Manager > ID: 0x0005 > Status: active, boot-order > Partition: /dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0 > File: └─/EFI/MICROSOFT/BOOT/BOOTMGFW.EFI > > Boot Loader Entries: > $BOOT: /efi (/dev/disk/by-partuuid/e3cdac2c-91c9-4be9-abdd-b97a9dea16f0) > token: fedora > > Default Boot Loader Entry: > type: Boot Loader Specification Type #1 (.conf) > title: Fedora Linux 42 (Adams) (6.15.9-201.fc42.x86_64) > id: e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf > source: /efi//loader/entries/e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf (on the EFI System Partition) > sort-key: fedora > version: 6.15.9-201.fc42.x86_64 > machine-id: e74ab0d2949c479eb03abdab1b1acd41 > linux: /efi//e74ab0d2949c479eb03abdab1b1acd41/6.15.9-201.fc42.x86_64/linux > initrd: /efi//e74ab0d2949c479eb03abdab1b1acd41/6.15.9-201.fc42.x86_64/initrd > options: root=/dev/mapper/vg_breadbox-lv_fedora ro <a href="http://rd.lvm.lv" rel="noreferrer" target="_blank">rd.lvm.lv</a>=vg_breadbox/lv_fedora elevator=deadline intel_iommu=on systemd.machine_id=e74ab0d2949c479eb03abdab1b1acd41 I don't see any obviously fatal errors when I do a dry run. > $ sudo SYSTEMD_LOG_LEVEL=debug systemctl --dry-run kexec > Bus n/a: changing state UNSET → OPENING > sd-bus: starting bus by connecting to /run/dbus/system_bus_socket... > Bus n/a: changing state OPENING → AUTHENTICATING > Bus n/a: changing state AUTHENTICATING → HELLO > Sent message type=method_call sender=n/a destination=org.freedesktop.DBus path=/org/freedesktop/DBus interface=org.freedesktop.DBus member=Hello cookie=1 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a > Got message type=method_return sender=org.freedesktop.DBus destination=:1.17 path=n/a interface=n/a member=n/a cookie=4294967295 reply_cookie=1 signature=s error-name=n/a error-message=n/a > Bus n/a: changing state HELLO → RUNNING > Sent message type=method_call sender=n/a destination=org.freedesktop.login1 path=/org/freedesktop/login1 interface=org.freedesktop.login1.Manager member=ListInhibitors cookie=2 reply_cookie=0 signature=n/a error-name=n/a error-message=n/a > Got message type=method_return sender=:1.2 destination=:1.17 path=n/a interface=n/a member=n/a cookie=33 reply_cookie=2 signature=a(ssssuu) error-name=n/a error-message=n/a > Found container virtualization none. > /dev/sda2: Partition has wrong PART_ENTRY_TYPE=0fc63daf-8483-4772-8e79-3d69d8477de4 for XBOOTLDR partition. > Reading EFI variable /sys/firmware/efi/efivars/LoaderEntryOneShot-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f. > open("/sys/firmware/efi/efivars/LoaderEntryOneShot-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f") failed: No such file or directory > Reading EFI variable /sys/firmware/efi/efivars/LoaderEntryDefault-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f. > open("/sys/firmware/efi/efivars/LoaderEntryDefault-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f") failed: No such file or directory > Reading EFI variable /sys/firmware/efi/efivars/LoaderEntrySelected-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f. > Found default: id "e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf" is matched by pattern "e74ab0d2949c479eb03abdab1b1acd41-*" > Found default boot loader entry in file "/efi/loader/entries/e74ab0d2949c479eb03abdab1b1acd41-6.15.9-201.fc42.x86_64.conf" > 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 <a href="http://rd.lvm.lv" rel="noreferrer" target="_blank">rd.lvm.lv</a>=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. Thanks! -- ======================================================================== If your user interface is intuitive in retrospect ... it isn't intuitive ======================================================================== </blockquote></div>