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Message-ID: <68e3503c-5573-4d82-8fb0-5b955c212d67@leemhuis.info>
Date: Sat, 13 Apr 2024 11:46:09 +0200
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Subject: Re: [bisected] Kernel v6.9-rc3 fails to boot on a Thinkpad T60 with
 MITIGATION_RETHUNK=y (regression from v6.8.5)
To: Bagas Sanjaya <bagasdotme@gmail.com>,
 Erhard Furtner <erhard_f@mailbox.org>, x86@kernel.org,
 Linux Regressions <regressions@lists.linux.dev>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
 jpoimboe@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
 Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
 Dave Hansen <dave.hansen@linux.intel.com>,
 Peter Zijlstra <peterz@infradead.org>, Breno Leitao <leitao@debian.org>
References: <20240413024956.488d474e@yea> <ZhpOIeVq1KQXzjBp@archie.me>
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@leemhuis.info>
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On 13.04.24 11:19, Bagas Sanjaya wrote:
> On Sat, Apr 13, 2024 at 02:49:56AM +0200, Erhard Furtner wrote:
>> Greetings!
>>
>> With MITIGATION_RETHUNK=y selected in kernel .config v6.9-rc3 fails to boot on my Thinkpad T60. The resulting kernel stalls booting at "x86/fpu: x87 FPU will use FXSAVE":
>> [...]
>> 4461438a8405e800f90e0e40409e5f3d07eed381 is the first bad commit

There was an earlier report about this here:
https://lore.kernel.org/all/78e0d19c-b77a-4169-a80f-2eef91f4a1d6@gmail.com/

Boris there suggested: "perhaps we should make
CONFIG_MITIGATION_RETHUNK depend on !X86_32":
https://lore.kernel.org/all/20240403173059.GJZg2SUwS8MXw7CdwF@fat_crate.local/

But that did not happen afaics. Would it be wise to go down that path?

Ciao, Thorsten