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Re: Buster won't boot with Xen hypervisor

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Apparently, the similarity in version numbers between Xen and the Linux kernel is more coincidental, and they aren’t required to match. How can I start to debug a boot configuration that’s not working? I’ve tried regenerating with with `update-grub` and `update-initramfs -u`, but no luck.

I’ve also confirmed that the initrd generated by update-initramfs is the one used by the xen boot entry in /boot/grub/grub.cfg. I’ve tried rebooting, changing my boot options to “debug earlyprintk=efi,keep”. It causes torrents of information for the non-xen (successful) boot, but seems to have no impact on the xen option. I still just see:
> Loading Xen 4.11-amd64 …
> Loading Linux 4.19.0-8-amd64 …
> Loading initial ramdisk …

How can I begin debugging this?

- Garrett

> On Feb 24, 2020, at 6:34 PM, Garrett Reid <garrett.reid@gmail.com> wrote:
> 
> Hey, Debian folks!
> 
> After updating to Buster, my system is unable to boot with the Xen hypervisor. When I try and boot, the screen gets stuck loading the ramdisk:
>> Loading Xen 4.11-amd64 …
>> Loading Linux 4.19.0.8-amd-64 …
>> Loading initial ramdisk …
> 
> I’m immediately suspicious of the version mismatch, especially since booting “Debian GNU/Linux” instead of “Debian GNU/Linux, with Xen hypervisor” works just fine.
> 
> I still have the appropriate xen package installed:
>> bash# apt install xen-system
>> Reading package lists... Done
>> Building dependency tree       
>> Reading state information... Done
>> Note, selecting 'xen-system-amd64' instead of 'xen-system'
>> xen-system-amd64 is already the newest version (4.11.3+24-g14b62ab3e5-1~deb10u1).
> 
> And there doesn’t seem to be a 4.11 hypervisor option:
>> bash# apt-cache search xen-hypervisor
>> xen-hypervisor-4.11-amd64 - Xen Hypervisor on AMD64
>> xen-hypervisor-common - Xen Hypervisor - common files
>> xen-hypervisor-4.8-amd64 - Xen Hypervisor on AMD64
> 
> Furthermore, there also aren’t any packages for a 4.11 stock kernel to match the hypervisor:
>> bash# apt-cache search linux-image-4. | fgrep 'amd64 ' | egrep -v 'headers|cloud|rt'
>> linux-image-4.19.0-8-amd64 - Linux 4.19 for 64-bit PCs (signed)
>> linux-image-4.19.0-6-amd64 - Linux 4.19 for 64-bit PCs (signed)
>> linux-image-4.9.0-11-amd64 - Linux 4.9 for 64-bit PCs
>> linux-image-4.9.0-12-amd64 - Linux 4.9 for 64-bit PCs
>> linux-image-4.9.0-4-amd64 - Linux 4.9 for 64-bit PCs
>> linux-image-4.9.0-8-amd64 - Linux 4.9 for 64-bit PCs
>> linux-image-4.9.0-9-amd64 - Linux 4.9 for 64-bit PCs
> 
> 
> (I also checked what old kernels I had lying around in /boot; only a few varieties of 4.9.0).
> 
> Am I correctly understanding the issue here? If so, is there a way to get a newer xen hypervisor from a repo somewhere? (I can’t find it in backports or proposed-updates). Or, is there a way to find a matching old kernel image?
> 
> And if not, where do I start debugging?
> 
> Thanks for your help,
> - Garrett
> 

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Buster won't boot with Xen hypervisor Garrett Reid <garrett.reid@gmail.com> - 2020-02-25 03:40 +0100
  Re: Buster won't boot with Xen hypervisor Garrett Reid <garrett.reid@gmail.com> - 2020-02-25 22:50 +0100

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