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Message-ID: <53430646.40507@archlinux.org>
Date: Mon, 07 Apr 2014 22:10:46 +0200
From: =?ISO-8859-15?Q?Thomas_B=E4chler?= <thomas@archlinux.org>
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To: =?ISO-8859-15?Q?Thomas_B=E4chler?= <thomas@archlinux.org>,
        Andi Kleen <ak@linux.intel.com>
CC: Al Viro <viro@ZenIV.linux.org.uk>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org, tpowa@archlinux.org
Subject: Re: 3.13: <module> disagrees about version of symbol <symbol>
References: <52E4CF03.8030208@archlinux.org> <5339F739.2060207@archlinux.org> <20140331233450.GI32556@tassilo.jf.intel.com> <5339FC62.8060207@archlinux.org> <20140405011332.GR32556@tassilo.jf.intel.com> <5340134B.4010705@archlinux.org> <20140407173016.GU32556@tassilo.jf.intel.com> <5342E46B.4080603@archlinux.org>
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Am 07.04.2014 19:46, schrieb Thomas B=E4chler:
> 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:=20
>>
>> commit e06df6a7eae1ab1ef4deb076aeeaed90e948e5c0
>> Merge: c0fc3cb 9dd721c
>> Author: Linus Torvalds <torvalds@linux-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.
>=20
> 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=
=2E
> I will do more tests today on two of my own computers to narrow this do=
wn.

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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