[Bug 2139579] [NEW] Raspberry Pi tryboot rollback: linux-image-6.17.0-1007-raspi fails to boot, piboot-try marks new slot as bad and falls back to 6.17.0-1006

[Iman Alipour]

Public bug reported:

Release: Ubuntu 25.10 (Questing) on Raspberry Pi (arm64)
Hardware: Raspberry Pi (booting via piboot-try / A-B boot)
Package: flash-kernel 3.109ubuntu6.1

After upgrading, piboot-try reports:

New boot assets in /boot/firmware/new failed. Fallen back to known good
state.

The system automatically rolls back from the new kernel to the previous
kernel.

Expected result:
The newly installed kernel should boot successfully and become the active boot slot.

Actual result:
The system fails to boot with the new kernel, piboot-try marks /boot/firmware/new/state as bad, and the system falls back to the previous kernel without any userspace logs.

Details:
	•	Current (known-good) kernel: 6.17.0-1006-raspi
	•	New (failed) kernel: 6.17.0-1007-raspi
	•	/boot/firmware/current/state = good
	•	/boot/firmware/new/state = bad
	•	cmdline.txt is identical between current and new slots
	•	initrd.img exists and is valid in both slots
	•	Failure happens before userspace (no journal entries for flash-kernel or flash-kernel-piboot)

Holding and downgrading linux-image-raspi to 6.17.0-1006 avoids the
issue.

This appears to be a regression in kernel 6.17.0-1007-raspi or its
interaction with piboot-try on this hardware.

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: flash-kernel 3.109ubuntu6.1
ProcVersionSignature: Ubuntu 6.17.0-1006.6-raspi 6.17.2
Uname: Linux 6.17.0-1006-raspi aarch64
ApportVersion: 2.33.1-0ubuntu3
Architecture: arm64
CasperMD5CheckResult: unknown
CloudArchitecture: aarch64
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSubPlatform: config-disk (/dev/sda1)
Date: Mon Feb  2 10:25:14 2026
ImageMediaBuild: 20251007
ProcEnviron:
 LANG=C.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: flash-kernel
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: flash-kernel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug arm64 arm64-image questing raspi-image

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https://bugs.launchpad.net/bugs/2139579

Title:
  Raspberry Pi tryboot rollback: linux-image-6.17.0-1007-raspi fails to
  boot, piboot-try marks new slot as bad and falls back to 6.17.0-1006

Status in flash-kernel package in Ubuntu:
  New

Bug description:
  Release: Ubuntu 25.10 (Questing) on Raspberry Pi (arm64)
  Hardware: Raspberry Pi (booting via piboot-try / A-B boot)
  Package: flash-kernel 3.109ubuntu6.1

  After upgrading, piboot-try reports:

  New boot assets in /boot/firmware/new failed. Fallen back to known
  good state.

  The system automatically rolls back from the new kernel to the
  previous kernel.

  Expected result:
  The newly installed kernel should boot successfully and become the active boot slot.

  Actual result:
  The system fails to boot with the new kernel, piboot-try marks /boot/firmware/new/state as bad, and the system falls back to the previous kernel without any userspace logs.

  Details:
  	•	Current (known-good) kernel: 6.17.0-1006-raspi
  	•	New (failed) kernel: 6.17.0-1007-raspi
  	•	/boot/firmware/current/state = good
  	•	/boot/firmware/new/state = bad
  	•	cmdline.txt is identical between current and new slots
  	•	initrd.img exists and is valid in both slots
  	•	Failure happens before userspace (no journal entries for flash-kernel or flash-kernel-piboot)

  Holding and downgrading linux-image-raspi to 6.17.0-1006 avoids the
  issue.

  This appears to be a regression in kernel 6.17.0-1007-raspi or its
  interaction with piboot-try on this hardware.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: flash-kernel 3.109ubuntu6.1
  ProcVersionSignature: Ubuntu 6.17.0-1006.6-raspi 6.17.2
  Uname: Linux 6.17.0-1006-raspi aarch64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: arm64
  CasperMD5CheckResult: unknown
  CloudArchitecture: aarch64
  CloudID: nocloud
  CloudName: unknown
  CloudPlatform: nocloud
  CloudSubPlatform: config-disk (/dev/sda1)
  Date: Mon Feb  2 10:25:14 2026
  ImageMediaBuild: 20251007
  ProcEnviron:
   LANG=C.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: flash-kernel
  UpgradeStatus: No upgrade log present (probably fresh install)

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