[4.0] Kernel panic in HVM

[Vít Šesták]

Hello,
I have tried to boot Fedora 29 Silverblue in a HVM from the official ISO. I have noticed that there is some kernel panic before the HVM shuts down. The problem is that I cannot read it. Is there any way to read it, e.g., by disabling the automatic reboot somehow?

Regards,
Vít Šesták 'v6ak'

[Marek Marczykowski-Górecki]

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On Sun, Mar 17, 2019 at 04:02:31PM -0700, Vít Šesták wrote:
> Hello,
> I have tried to boot Fedora 29 Silverblue in a HVM from the official ISO. I have noticed that there is some kernel panic before the HVM shuts down. The problem is that I cannot read it. Is there any way to read it, e.g., by disabling the automatic reboot somehow?

Try pointing kernel at hvc0 console (console=hvc0 kernel arg), then you
should get it in /var/log/xen/console/guest-VMNAME.log.

- --
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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[Vít Šesták]

Thank you. The error message has told me that there was an attempt to kill the error process. I was not sure about the reason, but I have guessed that it is caused by low RAM (I had 400MiB, which is probably the default for some reason). Increasing the RAM has helped. Well, it had caused an issue with blank screen, since the console was redirected to hvc0, but booting with more RAM and without console=hvc0 has succeeded.

So, my issue is resolved, thank you for the assistance.

I wonder how was chosen the default RAM for HVMs. I believe that 400MiB is rarely enough nowadays.

Regards,
Vít Šesták 'v6ak'

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