Bug#1119673: error: not xen image

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From	Richard <rrosner5@gmail.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1119673: error: not xen image
Date	Thu, 30 Oct 2025 11:40:01 +0100
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Package: linux-image-amd64
Version: 6.12.48-1
Severity: important
Tags: patch


Dear Maintainer,
like already mentioned in Bug#1098798, the Linux kernels in Trixie that are installed by linux-image-amd64 are not capable of booting on a Xen hypervisor. This is an issue with the config used to compile the kernel. The error message that's produced is


Loading Linux 6.12.48-amd64 ...
error: not xen image.
Loading initial ramdisk ...
error: you need to load the kernel first.

Press any key to continue...

VM type is "pv".


After asking on the Project Xen mailing list I can now say with certainty that the offending config is "CONFIG_KERNEL_ZSTD". Disabling it lets the kernel boot again. The cause is pvgrub not supporting the required zstdio iofilter, which supposedly is being fixed right now with grub-2.14~rc1.

Best regards

Richard

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Bug#1119673: error: not xen image Richard <rrosner5@gmail.com> - 2025-10-30 11:40 +0100

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