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

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Message-ID: <20250527174612.ml4raiueqdophhxl@desk>
Date: Tue, 27 May 2025 10:46:12 -0700
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Xin Li <xin@...or.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Jürgen Groß <jgross@...e.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	alexandre.chartre@...cle.com,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	"Zhang, Tao1" <tao1.zhang@...el.com>
Subject: Re: [Bug Report] Linux v6.15-rc7 boot failure on Xen-4.17

On Sat, May 24, 2025 at 09:42:21PM -0700, 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.

Serial logs aren't telling much. I do not have a Xen setup to test, without
Xen the config that you provided is booting a KVM guest just fine.

Adding Andrew if he has any pointers on debugging this.