Re: [PATCH rc v7 0/7] iommu/arm-smmu-v3: Fix device crash on kdump kernel

[Jason Gunthorpe]

On Tue, Jun 30, 2026 at 12:24:58PM -0700, Nicolin Chen wrote:
> > I don't know exactly the sequence of events that lead up to the kdump
> > kernel crashing (I imagine it is hard to debug that one), but it is
> > something related to the new kernel not participating in the RAS and
> > the RAS flow escalating to something fatal.
> 
> Here is the original bug report:
>  - kernel boots into a crash kernel
>  - crash kernel hits OOM do to insufficient reserved memory and
>    panics
>  - PCIe errors are observed during this failure flow

Maybe the RAS events hits some bugs and OOMs the kdump kernel?

Regardless more general cases like CXL are still things where you
don't want to cause unexpected ATS failures..

Jason