On 31/07/2015 02:22, Jason Gunthorpe wrote:
>  int ib_dealloc_pd(struct ib_pd *pd)
>  {
> +     if (pd->local_mr) {
> +             if (ib_dereg_mr(pd->local_mr))
> +                     return -EBUSY;
> +             pd->local_mr = NULL;
> +     }
> +

It looks like ib_uverbs_alloc_pd calls ib_device.alloc_pd() directly,
and some drivers don't use kzalloc for allocating the pd, so the
ib_dereg_mr call above results in a general protection fault.

Haggai
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