linux-kernel - Re: [Bug Report] Linux v6.15-rc7 boot failure on Xen-4.17

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Message-ID: <21456608-aa50-4d70-b201-b51764347804@suse.com>
Date: Sun, 25 May 2025 08:58:15 +0200
From: Jürgen Groß <jgross@...e.com>
To: Xin Li <xin@...or.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "x86@...nel.org" <x86@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
 Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>, alexandre.chartre@...cle.com
Subject: Re: [Bug Report] Linux v6.15-rc7 boot failure on Xen-4.17

On 25.05.25 06:42, Xin Li wrote:
> Just noticed vanilla v6.15-rc7 fails to boot on Xen 4.17 (Ubuntu Xen
> package) in a KVM guest.  So I did a bisect, and it says:
> 
> 872df34d7c51a79523820ea6a14860398c639b87 is the first bad commit
> commit 872df34d7c51a79523820ea6a14860398c639b87
> Author: Peter Zijlstra <peterz@...radead.org>
> Date:   Mon Oct 14 10:05:48 2024 -0700
> 
>      x86/its: Use dynamic thunks for indirect branches
> 
> 
> Attached is the serial console log and my kernel config.

So you are saying that the host kernel is to blame, given that above
commit isn't in the dom0 kernel.

Can you start e.g. a normal Linux guest on that host?

Any host messages to be seen when that happens?


Juergen

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