Xen devel - May 2010 - Re: Re: Xen-4 PVUSB kernel bug / Xenlinux 2.6.32

On Fri, May 14, 2010 at 09:10:57PM +0200, Peter Klar
wrote:
> As the bug seems to be related to the SLAB allocator, the dump says
''kernel
> BUG at mm/slub.c:2969!'', I also recompiled the kernel using the
SLAB instead
> of SLUB allocator, but this does not make any difference, the behaviour is 
> the same (beside the dump then reports a bug within slab.c instead of 
> slub.c).
The corresponding register/stack dump from the SLAB case would
certainly be interesting.

Also, since your kernel may be arbitrarily patched from the original
2.6.32, it would be helpful if you could confirm that the line you get
reported is in fact referring to

        BUG_ON(!PageCompound(page));

in slub.c''s kfree().
 
> Do you have any hints regarding this issue, do I perhaps miss some USB 
> related modules or similar?
Missing modules cannot be the issue here, it must be something wrong
within the USB backend that causes this misbehavior.

Is your Dom0 kernel a pv-ops one (not sure if pv USB even exists
there) or a forward port?

Jan


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On Wednesday 19 May 2010, Jan Beulich wrote:
> On Fri, May 14, 2010 at 09:10:57PM +0200, Peter Klar wrote:
> > As the bug seems to be related to the SLAB allocator, the dump says
> > ''kernel BUG at mm/slub.c:2969!'', I also recompiled
the kernel using
> > the SLAB instead of SLUB allocator, but this does not make any
> > difference, the behaviour is the same (beside the dump then reports a
> > bug within slab.c instead of slub.c).
> 
> The corresponding register/stack dump from the SLAB case would
> certainly be interesting.
How do I get the dump?
> Also, since your kernel may be arbitrarily patched from the original
> 2.6.32, it would be helpful if you could confirm that the line you get
> reported is in fact referring to
> 
>         BUG_ON(!PageCompound(page));
> 
> in slub.c''s kfree().
Again, how can I confirm this?
> Is your Dom0 kernel a pv-ops one (not sure if pv USB even exists
> there) or a forward port?
Afaik the gentoo xen kernel sources are based on the opensuse patches.

Regards

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