[DRBD-user] Kernel oops on create-md

[Lars Ellenberg]

On Thu, Oct 15, 2009 at 03:17:40PM +0100, Stef Morrell wrote:
> Hello,
> 
> > -----Original Message-----
> > From: drbd-user-bounces at lists.linbit.com 
> > [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Lars 
> > Ellenberg
> > Sent: 15 October 2009 14:25
> > To: drbd-user at lists.linbit.com
> > Subject: Re: [DRBD-user] Kernel oops on create-md
> > 
> > On Thu, Oct 15, 2009 at 02:10:54PM +0100, Stef Morrell wrote:
> > > Hello,
> > > 
> > > I'm attempting to run drbd 8.3.4 against Linux 2.31.4. I'm 
> > making the 
> > > (possibly incorrect) assumption that from the Changelog,
> > > 
> > > 8.3.3
> > >  * Following Linux upstream changes 2.6.31
> > > 
> > > that I'm ok on the 2.6.31 kernel series.
> > > 
> > > I've patched the kernel directly and can see from
> > > 
> > > root [ /sources/drbd-8.3.4 ]# cat /proc/drbd
> > > version: 8.3.4 (api:88/proto:86-91)
> > > GIT-hash: 70a645ae080411c87b4482a135847d69dc90a6a2 build by 
> > > root at atuin-1, 2009-10-15 11:36:31
> > > 
> > > that the patch has been applied correctly.
> > 
> > Nope.
> > 
> > > My problem is that when I attempt to create the metadata I get a 
> > > kernel Oops, output of which is attached. I've also included my 
> > > drbd.conf, very basic, but there you have it.
> > > 
> > > Problem is 100% reproduceable both on this machine and it's 
> > > (identical) counterpart which will (eventually) form the 
> > second node in the cluster.
> > > 
> > > I've wondered if it is a kernel compatibility problem,
> > 
> > Yes.
> > 
> > > I wonder if anyone can provide some advice?
> > 
> > You patched it wrong.  Sorry.
> 
> Do you mean that 2.6.31.4 isn't supported at all, or that I've made a
> mistake in the patching process itself? (Log of patching process
> attached). If it is the kernel version, what is actually the latest
> which drbd supports?

I mean you patched it wrong.

> > If you get any compile warnings during the module build, you 
> > got it wrong again. So try again.
> 
> Yes. One compile warning - does seem to fit with the oops.
> 
> drivers/block/drbd/drbd_nl.c: In function 'drbd_nl_init':
> drivers/block/drbd/drbd_nl.c:2380: warning: passing argument 3 of
> 'cn_add_callback' from incompatible pointer type

yep.

> root [ /sources/drbd-8.3.4 ]# make KDIR=/sources/linux-2.6.31.4 kernel-patch

forget about that.
_that_ is not supported.
sometimes it works, sometime it does not.
if it does not work, it does not work.

it may help if you do a "normal" out-of-tree module build, before you
generate the patch.  there is some automatic adjustment of compatibility
ifdefs going on.

if it does not help,
don't use the "kernel-patch" approach.

-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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