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  1. Bug #494658
  2. Comment #3

Comment 3 for bug 494658

Revision history for this message
Mario Kothe (mario-kothe) wrote : Re: [Bug 494658] Re: linux-headers-2.6.31-16-server; DRBD module can't be loaded; Unknown symbol cn_add_callback

Hello,

so I started with the -16 kernel and as requested here are the outputs
from modinfo and dkms

#modinfo drbd:

On Mon, 2009-12-14 at 13:21 +0000, Stefan Bader wrote:modinfo drbd
filename: /lib/modules/2.6.31-16-server/updates/dkms/drbd.ko
alias: block-major-147-*
license: GPL
version: 8.3.3
description: drbd - Distributed Replicated Block Device v8.3.3
author: Philipp Reisner <email address hidden>, Lars Ellenberg
<email address hidden>
srcversion: 8F005DC598E07E771AA1BA8
depends:
vermagic: 2.6.31-15-server SMP mod_unload modversions
parm: minor_count:Maximum number of drbd devices (1-255)
(uint)
parm: disable_sendpage:bool
parm: allow_oos:DONT USE! (bool)
parm: cn_idx:uint
parm: proc_details:int
parm: enable_faults:int
parm: fault_rate:int
parm: fault_count:int
parm: fault_devs:int
parm: usermode_helper:string

#dkms status:

drbd8, 8.3.3, 2.6.31-15-server, x86_64: installed
drbd8, 8.3.3, 2.6.31-16-generic, x86_64: installed
drbd8, 8.3.3, 2.6.31-16-server, x86_64: installed
drbd8, 8.3.3, 2.6.31-14-server, x86_64: installed
drbd8, 8.3.3, 2.6.31-15-generic, x86_64: installed

Well, didn't notice it earlier, but modinfo is showing 2.6.31-15 which
it should not. Just clear out the the system is indeed using the -16
kenrel, uname -a output follows:

Linux archangel 2.6.31-16-server #53-Ubuntu SMP Tue Dec 8 05:08:02 UTC
2009 x86_64 GNU/Linux

And the drbd module for 2.6.31-16 does exist. Because a locate drbd.ko
returns the following reuslt:

#locate drbd.ko

/lib/modules/2.6.31-11-server/kernel/ubuntu/drbd/drbd.ko
/lib/modules/2.6.31-14-server/kernel/ubuntu/drbd/drbd.ko
/lib/modules/2.6.31-14-server/updates/dkms/drbd.ko
/lib/modules/2.6.31-15-generic/updates/dkms/drbd.ko
/lib/modules/2.6.31-15-server/kernel/ubuntu/drbd/drbd.ko
/lib/modules/2.6.31-15-server/updates/dkms/drbd.ko
/lib/modules/2.6.31-16-generic/updates/dkms/drbd.ko
/lib/modules/2.6.31-16-server/kernel/ubuntu/drbd/drbd.ko
/lib/modules/2.6.31-16-server/updates/dkms/drbd.ko
/var/lib/dkms/drbd8/8.3.3/2.6.31-14-server/x86_64/module/drbd.ko
/var/lib/dkms/drbd8/8.3.3/2.6.31-15-generic/x86_64/module/drbd.ko
/var/lib/dkms/drbd8/8.3.3/2.6.31-15-server/x86_64/module/drbd.ko
/var/lib/dkms/drbd8/8.3.3/2.6.31-16-generic/x86_64/module/drbd.ko
/var/lib/dkms/drbd8/8.3.3/2.6.31-16-server/x86_64/module/drbd.ko

> I believe there might be two versions of the module: the in-kernel and a
> DKMS external one. When booted into the -16 kernel, can you do a
> "modinfo drbd" and attach the output. While being on it, also do a "dkms
> status" and also attach that output to the bug report.
>