kernel crash on bootup for some arm64 machines

[Abdur Rahman]

[ Impact ]

Questing generic kernel will fail to boot on some arm64 machines.

[ Fix ]

Cherry pick upstream commit c35dd838666d47d ("KVM: arm64: Guard PMSCR_EL1 initialization with SPE presence check").

[ Test Plan ]

Compile and boot tested

[ Where problems could occur ]

This commit touches ARM_SPE, so tools utilizing this feature could show undefined behavior.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/6.17.0-8.8 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-questing-linux' to 'verification-done-questing-linux'. If the problem still exists, change the tag 'verification-needed-questing-linux' to 'verification-failed-questing-linux'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-aws-6.17/6.17.0-1005.5~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-aws-6.17' to 'verification-done-noble-linux-aws-6.17'. If the problem still exists, change the tag 'verification-needed-noble-linux-aws-6.17' to 'verification-failed-noble-linux-aws-6.17'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 6.17.0-8.8

---------------
linux (6.17.0-8.8) questing; urgency=medium

  * questing/linux: 6.17.0-8.8 -proposed tracker (LP: #2131554)

  * crash when reading from /sys/kernel/tracing/rv/enabled_monitors
    (LP: #2131136)
    - rv: Fully convert enabled_monitors to use list_head as iterator

  * i40e driver is triggering VF resets on every link state change
    (LP: #2130552)
    - i40e: avoid redundant VF link state updates

  * kernel crash on bootup for some arm64 machines (LP: #2129770)
    - KVM: arm64: Guard PMSCR_EL1 initialization with SPE presence check

  * CVE-2025-40018
    - ipvs: Defer ip_vs_ftp unregister during netns cleanup

 -- Manuel Diewald <email address hidden> Fri, 14 Nov 2025 17:53:03 +0100

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-realtime-6.17/6.17.0-1004.5~24.04.2 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-realtime-6.17' to 'verification-done-noble-linux-realtime-6.17'. If the problem still exists, change the tag 'verification-needed-noble-linux-realtime-6.17' to 'verification-failed-noble-linux-realtime-6.17'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 6.17.0-8.8

---------------
linux (6.17.0-8.8) questing; urgency=medium

  * questing/linux: 6.17.0-8.8 -proposed tracker (LP: #2131554)

  * crash when reading from /sys/kernel/tracing/rv/enabled_monitors
    (LP: #2131136)
    - rv: Fully convert enabled_monitors to use list_head as iterator

  * i40e driver is triggering VF resets on every link state change
    (LP: #2130552)
    - i40e: avoid redundant VF link state updates

  * kernel crash on bootup for some arm64 machines (LP: #2129770)
    - KVM: arm64: Guard PMSCR_EL1 initialization with SPE presence check

  * CVE-2025-40018
    - ipvs: Defer ip_vs_ftp unregister during netns cleanup

 -- Manuel Diewald <email address hidden> Fri, 14 Nov 2025 17:53:03 +0100

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-nvidia-6.17/6.17.0-1006.6 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-nvidia-6.17' to 'verification-done-noble-linux-nvidia-6.17'. If the problem still exists, change the tag 'verification-needed-noble-linux-nvidia-6.17' to 'verification-failed-noble-linux-nvidia-6.17'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-intel/6.17.0-1006.6 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-questing-linux-intel' to 'verification-done-questing-linux-intel'. If the problem still exists, change the tag 'verification-needed-questing-linux-intel' to 'verification-failed-questing-linux-intel'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-hwe-6.17/6.17.0-14.14~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-hwe-6.17' to 'verification-done-noble-linux-hwe-6.17'. If the problem still exists, change the tag 'verification-needed-noble-linux-hwe-6.17' to 'verification-failed-noble-linux-hwe-6.17'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-azure-6.17/6.17.0-1008.8~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-azure-6.17' to 'verification-done-noble-linux-azure-6.17'. If the problem still exists, change the tag 'verification-needed-noble-linux-azure-6.17' to 'verification-failed-noble-linux-azure-6.17'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-azure-fde-6.17/6.17.0-1005.5~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-azure-fde-6.17' to 'verification-done-noble-linux-azure-fde-6.17'. If the problem still exists, change the tag 'verification-needed-noble-linux-azure-fde-6.17' to 'verification-failed-noble-linux-azure-fde-6.17'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-gcp-6.17/6.17.0-1007.7~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-gcp-6.17' to 'verification-done-noble-linux-gcp-6.17'. If the problem still exists, change the tag 'verification-needed-noble-linux-gcp-6.17' to 'verification-failed-noble-linux-gcp-6.17'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Stefan Bader (smb)]

The many verification requests feel like tooling going wrong. According to sub-tasks this has been released already. But 6.17 backports into noble list them as it is the first public upload for them.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-oracle-6.17/6.17.0-1007.7~24.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-noble-linux-oracle-6.17' to 'verification-done-noble-linux-oracle-6.17'. If the problem still exists, change the tag 'verification-needed-noble-linux-oracle-6.17' to 'verification-failed-noble-linux-oracle-6.17'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!