linux-kernel - Re: crosstool: x86 kernel compiled with GCC 14.1 fails to boot

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Message-ID: <87le2abkt1.fsf@kernel.org>
Date: Tue, 09 Jul 2024 19:18:50 +0300
From: Kalle Valo <kvalo@...nel.org>
To: Jeff Johnson <quic_jjohnson@...cinc.com>
Cc: Arnd Bergmann <arnd@...db.de>,  <linux-kernel@...r.kernel.org>,
  <ath12k@...ts.infradead.org>
Subject: Re: crosstool: x86 kernel compiled with GCC 14.1 fails to boot

Jeff Johnson <quic_jjohnson@...cinc.com> writes:

> On 7/8/2024 10:44 PM, Arnd Bergmann wrote:
>> On Tue, Jul 9, 2024, at 05:55, Jeff Johnson wrote:
>>> On 7/8/2024 6:57 PM, Jeff Johnson wrote:
>>>> We tend to enable a lot of debug config options, so I'm wondering if one of
>>>> them is contributing to the issue? Guess I'll turn off a bunch of those
>>>> options and try again.
>>>
>>> OK, with a bunch of debug turned off my image boots.
>>>
>>> Now to find the culprit.
>>>
>>> Current diff between original config and working config:
>> 
>> Nice! I've tried the reverse now, turning on the options
>> you have turned off on top of my defconfig. This version
>> still works for me, booting with a plain
>> 'qemu-system-x86_64 -kernel arch/x86_64/boot/bzImage'
>> and building with my arm64-to-x86 cross compiler.
>
> I picked my favorite to begin with, enabling KASAN (which in turn enabled a
> few others). The resulting kernel did not boot for me (just saw a black screen
> after the GRUB menu). Diff between working and non-working config is below.
>
> I then downloaded and built the config you supplied. With that I have the same
> behavior as my original config, the display is frozen with:
> Loading initial ramdisk ...
>
>
> [jjohnson:laptop 1966] diff .config.old .config

BTW there's also scripts/diffconfig which provides a prettier diff.

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