Lustre discuss - Apr 2009 - DRBD modules compiled against Lustre kernel source, no version for "struct_module" found: kernel tainted.

Hi-

I''ve been running into this kernel message every time I''ve
built DRBD
modules against Lustre''s patched kernel and source.  I''ve just
tried it
again with Lustre 1.6.7.1 and it''s still showing up.  DRBD compiles and
functions without error, however, upon loading the module I see:

drbd: no version for "struct_module" found: kernel tainted.
>From what I understand, this message is warning that the module being
inserted was compiled against sources for another kernel.   I''m using
RHEL5 Lustre RPMs on both RHEL5 and CentOS 5.2 systems.  I''m wondering
if it is safe ignore these messages and attribute them to Lustre''s
kernel sources being packaged in a non-Redhat fashion. As I said, DRBD
seems to be working just fine and I haven''t noticed any performance
issues or any other scary kernel messages.

To get DRBD to find uts_releases, modpost, etc. and compile correctly, I
needed to prepare the source as follows:

Edit the EXTRAVERSION parameters in the kernel Makefile to point to the
correct directory in /lib/modules (EXTRAVERSION
-92.1.17.el5_lustre.1.6.7.1custom -> EXTRAVERSION
-92.1.17.el5_lustre.1.6.7.1smp)
/usr/src/linux-2.6.18-92.1.17.el5_lustre.1.6.7.1/make oldconfig && make
prepare && make modules_prepare && make mrproper
/usr/src/ linux-2.6.18-92.1.17.el5_lustre.1.6.7.1-obj/make prepare &&
make modules_prepare

Again, aside from the tainted kernel message everything seems to be
working fine but I''d love to get rid of the message or know for sure
that it is nothing to worry about. 

Thanks,
Adam

Posted to lustre-discuss and drbd-user.

I just built a fresh CentOS 5.1 system, i''m going to try two different
methods. First will be to build DRBD against a kernel patched via the RPM.
If there are any problems there then I will try a custom kernel with lustre
built completely from source (again on a fresh system). I''ll keep an
eye out
for the ''struct_module warning.


> -----Original Message-----
> From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-
> bounces at lists.lustre.org] On Behalf Of Adam Gandelman
> Sent: Friday, 17 April 2009 11:15 AM
> To: lustre-discuss at lists.lustre.org
> Subject: [Lustre-discuss] DRBD modules compiled against Lustre kernel
> source, no version for "struct_module" found: kernel tainted.
> 
> Hi-
> 
> I''ve been running into this kernel message every time
I''ve built DRBD
> modules against Lustre''s patched kernel and source.  I''ve
just tried it
> again with Lustre 1.6.7.1 and it''s still showing up.  DRBD
compiles and
> functions without error, however, upon loading the module I see:
> 
> drbd: no version for "struct_module" found: kernel tainted.
> 
> >From what I understand, this message is warning that the module being
> inserted was compiled against sources for another kernel.   I''m
using
> RHEL5 Lustre RPMs on both RHEL5 and CentOS 5.2 systems.  I''m
wondering
> if it is safe ignore these messages and attribute them to Lustre''s
> kernel sources being packaged in a non-Redhat fashion. As I said, DRBD
> seems to be working just fine and I haven''t noticed any
performance
> issues or any other scary kernel messages.
> 
> To get DRBD to find uts_releases, modpost, etc. and compile correctly,
> I
> needed to prepare the source as follows:
> 
> Edit the EXTRAVERSION parameters in the kernel Makefile to point to the
> correct directory in /lib/modules (EXTRAVERSION >
-92.1.17.el5_lustre.1.6.7.1custom -> EXTRAVERSION >
-92.1.17.el5_lustre.1.6.7.1smp)
> /usr/src/linux-2.6.18-92.1.17.el5_lustre.1.6.7.1/make oldconfig &&
make
> prepare && make modules_prepare && make mrproper
> /usr/src/ linux-2.6.18-92.1.17.el5_lustre.1.6.7.1-obj/make prepare
&&
> make modules_prepare
> 
> Again, aside from the tainted kernel message everything seems to be
> working fine but I''d love to get rid of the message or know for
sure
> that it is nothing to worry about.
> 
> Thanks,
> Adam
> 
> Posted to lustre-discuss and drbd-user.
> 
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss

On Apr 16, 2009  18:15 -0700, Adam Gandelman wrote:
> I''ve been running into this kernel message every time
I''ve built DRBD
> modules against Lustre''s patched kernel and source.  I''ve
just tried it
> again with Lustre 1.6.7.1 and it''s still showing up.  DRBD
compiles and
> functions without error, however, upon loading the module I see:
> 
> drbd: no version for "struct_module" found: kernel tainted.
Actually, I''ve seen this for other Lustre modules as well, so it
may relate to the kernel config or similar.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.