> Greetings all,
>
> On Tue, 2008-02-12 at 17:05 +0100, Bart Van Assche wrote:
> > On Feb 6, 2008 1:11 AM, Nicholas A. Bellinger <nab@linux-iscsi.org> wrote:
> > > I have always observed the case with LIO SE/iSCSI target mode ...
> >
> > Hello Nicholas,
> >
> > Are you sure that the LIO-SE kernel module source code is ready for
> > inclusion in the mainstream Linux kernel ? As you know I tried to test
> > the LIO-SE iSCSI target. Already while configuring the target I
> > encountered a kernel crash that froze the whole system. I can
> > reproduce this kernel crash easily, and I reported it 11 days ago on
> > the LIO-SE mailing list (February 4, 2008). One of the call stacks I
> > posted shows a crash in mempool_alloc() called from jbd. Or: the crash
> > is most likely the result of memory corruption caused by LIO-SE.
> >
>
> So I was able to FINALLY track this down to:
>
> -# CONFIG_SLUB_DEBUG is not set
> -# CONFIG_SLAB is not set
> -CONFIG_SLUB=y
> +CONFIG_SLAB=y
>
> in both your and Chris Weiss's configs that was causing the
> reproduceable general protection faults. I also disabled
> CONFIG_RELOCATABLE and crash dump because I was debugging using kdb in
> x86_64 VM on 2.6.24 with your config. I am pretty sure you can leave
> this (crash dump) in your config for testing.
>
> This can take a while to compile and take up alot of space, esp. with
> all of the kernel debug options enabled, which on 2.6.24, really amounts
> to alot of CPU time when building. Also with your original config, I
> was seeing some strange undefined module objects after Stage 2 Link with
> iscsi_target_mod with modpost with the SLUB the lockups (which are not
> random btw, and are tracked back to __kmalloc()).. Also, at module load
> time with the original config, there where some warning about symbol
> objects (I believe it was SCSI related, same as the ones with modpost).
>
> In any event, the dozen 1000 loop discovery test is now working fine (as
> well as IPoIB) with the above config change, and you should be ready to
> go for your testing.
>
> Tomo, Vlad, Andrew and Co:
>
> Do you have any ideas why this would be the case with LIO-Target..? Is
> anyone else seeing something similar to this with their target mode
> (mabye its all out of tree code..?) that is having an issue..? I am
> using Debian x86_64 and Bart and Chris are using Ubuntu x86_64 and we
> both have this problem with CONFIG_SLUB on >= 2.6.22 kernel.org
> kernels.
>
> Also, I will recompile some of my non x86 machines with the above
> enabled and see if I can reproduce.. Here the Bart's config again:
>
>
http://groups.google.com/group/linux-iscsi-target-dev/browse_thread/thread/30835aede10...
>
