Re: [syzbot] [iommu?] kernel BUG in dma_alloc_attrs

[Christoph Hellwig]

The problem is that the dma alloc/free tracing calls virt_to_phys
on the allocated/free memory.  But that memory can be vmalloced as
in this case.  I think we don't have weirdo allocators or pools any
more that are neither in the direct kernel mapping or vmalloc, so
we might be able to do an

		if (is_vmalloc_addr())
			page_to_phys(vmalloc_to_page()))
		else
			virt_to_page()

here.  Or just switch to tracing the virtual address to always be
on the safe side.