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

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Message-ID: <3cd3b448-e0c7-4408-8a8b-e08bb3b350c3@zytor.com>
Date: Sat, 24 May 2025 21:42:21 -0700
From: Xin Li <xin@...or.com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Cc: Jürgen Groß <jgross@...e.com>,
        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: [Bug Report] Linux v6.15-rc7 boot failure on Xen-4.17

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.

Thanks!
     Xin
View attachment "xen-dom0.config" of type "text/plain" (185086 bytes)

View attachment "xen-ubt.serial.log" of type "text/plain" (12888 bytes)