linux-kernel - Re: drbd 8.0.2/3 doesn't load under kernel 2.6.21

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Message-ID: <20070801223440.GS3972@stusta.de>
Date:	Thu, 2 Aug 2007 00:34:40 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Maurice Volaski <mvolaski@...om.yu.edu>
Cc:	jheffner@....edu, discussion@...100.org,
	linux-kernel@...r.kernel.org, drbd-user@...bit.com
Subject: Re: drbd 8.0.2/3 doesn't load under kernel 2.6.21

On Wed, Aug 01, 2007 at 04:21:29PM -0400, Maurice Volaski wrote:
> I'm making an assumption that depmod is somehow to blame and have logged 
> this as a kernel bug, http://bugzilla.kernel.org/show_bug.cgi?id=8829

depmod is working fine.

It's the interaction between your two patches that breaks it for you.

>>> It turns out I was adding the web100 patch (http://www.web100.org) to
>>> the 2.6.21 kernel and that's what causes the symbol resolving problem
>>> below. Adding the corresponding version of the web100 patch to the
>>> 2.6.20 kernel makes this problem appear there as well. On fresh
>>> versions of the kernel, this problem does not occur. At the moment,
>>> it's not possible to have a current kernel that contains both drbd
>>> and web100.
>>>
>>>> On a 64-bit Gentoo system with Gentoo's 2.6.21 kernel, drbd 8.0.2/3
>>>> complains when I try to load the module:
>>>>
>>>> [  134.141363] drbd: Unknown symbol cn_fini
>>>> [  134.141399] drbd: Unknown symbol cn_init
>>>>
>>>> It works fine when I compile it and load in the previous kernel
>>>> version, 2.6.20 and the symbols are present in the map file
>>>>
>>>> ./System.map-genkernel-x86_64-2.6.21-gentoo-r2:ffffffff802935aa t 
>>>> cn_fini
>>>> ./System.map-genkernel-x86_64-2.6.21-gentoo-r2:ffffffff8029362a t 
>>>> cn_init
>>>>
>>>> I am c'cing the kernel mailing list because this appears to be a
>>>> problem with how any module accesses symbols in the kernel, not just
>>>  >drbd. Source was compiled with Gentoo gcc-4.1.2, glibc-2.5-r3

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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