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SubjectCrash in intel_iommu_assign_device
Hi Sheng,

I'm not claiming to understand the details, but this looks like use
(dereference of pte via dma_pte_addr) after release (free_pgtable_page
of dmar_domain->pgd aka pte) to me:

static int intel_iommu_attach_device(struct iommu_domain *domain,
struct device *dev)
{
[...]
pte = dmar_domain->pgd;
if (dma_pte_present(pte)) {
free_pgtable_page(dmar_domain->pgd);
dmar_domain->pgd = (struct dma_pte *)
phys_to_virt(dma_pte_addr(pte));
}

At least it crashes here right on pte->val access. Swap both lines?

Jan

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