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

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Message-ID: <d94b8659-3392-478c-b9fa-bc951a687195@suse.com>
Date: Wed, 28 May 2025 10:39:59 +0200
From: Jürgen Groß <jgross@...e.com>
To: Xin Li <xin@...or.com>
Cc: Gupta Pawan <pawan.kumar.gupta@...ux.intel.com>,
 linux-kernel@...r.kernel.org, x86@...nel.org,
 Zijlstra Peter <peterz@...radead.org>,
 Hansen Dave <dave.hansen@...ux.intel.com>, alexandre.chartre@...cle.com,
 Cooper Andrew <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 27.05.25 21:21, Xin Li wrote:
> 
>> On May 27, 2025, at 11:36 AM, Jürgen Groß <jgross@...e.com> wrote:
>>
>> On 27.05.25 19:54, Xin Li wrote:
>>> On 5/27/2025 10:46 AM, Pawan Gupta wrote:
>>>>> 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.
>>> Yeah, as I replied to Juergen, the same kernel binary boots fine as
>>> "native".
>>> Unfortunately when booting as dom0 on Xen, it keeps rebooting w/o
>>> helpful log.
>>
>> What about booting Xen on bare metal, i.e. no KVM being involved?
> 
> The same exact problem happens on Intel Simics.  And I got to see it’s a NX page fault in dom0 kernel during apply alternatives.

Do you have a backtrace?

Hitting a NX page fault during applying alternatives sounds like calling
into a just allocated thunk which hasn't been set to ROX again.


Juergen

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