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

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Date:	Wed, 1 Aug 2007 19:02:14 -0400
From:	Maurice Volaski <mvolaski@...om.yu.edu>
To:	Adrian Bunk <bunk@...sta.de>
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

First, did you confirm this behavior? Can you please explain that? 
How could they possibly interact with one another?


>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

-- 

Maurice Volaski, mvolaski@...om.yu.edu
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University
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