linux-kernel - Re: 3.13: <module> disagrees about version of symbol <symbol>

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Date:	Mon, 07 Apr 2014 22:10:46 +0200
From:	Thomas Bächler <thomas@...hlinux.org>
To:	Thomas Bächler <thomas@...hlinux.org>,
	Andi Kleen <ak@...ux.intel.com>
CC:	Al Viro <viro@...IV.linux.org.uk>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, tpowa@...hlinux.org
Subject: Re: 3.13: <module> disagrees about version of symbol <symbol>

Am 07.04.2014 19:46, schrieb Thomas Bächler:
> Am 07.04.2014 19:30, schrieb Andi Kleen:
>>>> Do you have a specific config?
>>>> Specific compiler version?
>>>
>>> Using gcc 4.8 from Arch Linux with the configuration at [1] and Linux 3.14.
>>
>> I tested this configuration (with gcc 4.8 on FC20/19) and it loads
>> ext4 and all the other modules without any problems.
>>
>> Base tree: 
>>
>> commit e06df6a7eae1ab1ef4deb076aeeaed90e948e5c0
>> Merge: c0fc3cb 9dd721c
>> Author: Linus Torvalds <torvalds@...ux-foundation.org>
>> Date:   Mon Mar 31 12:34:49 2014 -0700
>>
>> Must be something really archlinux specific. Please do some debugging.
>> Also please double check that all your test procedures are correct.
> 
> Tetsuo was so kind to install Arch Linux and reproduce the exact
> procedure I use to create the kernel (which includes the automated
> creation of a pristine build environment) - his kernel booted just fine.
> I will do more tests today on two of my own computers to narrow this down.

I think I found out why nobody could reproduce the problem.

I did a few more tests and it turns out that the problem only occurs
when I boot the kernel with UEFI (using Gummiboot+EFISTUB). Now, except
for OVMF virtual machines, there are barely any 32 Bit UEFI machines
around, so nobody noticed. When I boot the kernel with 32 Bit BIOS, it
boots fine.

Just to clarify: As mentioned in my first mail, some symbols still get a
0x0 CRC (which I still think is wrong), but the mismatch does not occur
in BIOS mode.

On x86_64, the problem does not occur at all.



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