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The ibv_dereg_mr function causes a segmentation fault in memory_ib_free. This is probably caused, by memory_ib_mr which returns the wrong pointer to the memory region.

Fix this problem and start using memory_ib_mr in other places where we are doing pointer wizardry right now as well.

struct ibv_mr * memory_ib_mr(void *ptr)
{
        struct ibv_mr *mr = (struct ibv_mr *) ptr;

        return (mr - 1);
}

int memory_ib_free(struct memtype *m, void *ptr, size_t len)
{
        struct memory_ib *mi = (struct memory_ib *) m->_vd;
        struct ibv_mr *mr = memory_ib_mr(ptr);

        ibv_dereg_mr(mr);

        ptr -= sizeof(struct ibv_mr *);
        len += sizeof(struct ibv_mr *);

        memory_free(mi->parent, ptr, len);

        return 0;
}