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Re: [PATCH v6 00/16] dma-mapping: migrate to physical address-based API
- To: Keith Busch <kbusch@xxxxxxxxxx>
- From: Jason Gunthorpe <jgg@xxxxxxxxxx>
- Date: Tue, 23 Sep 2025 19:22:16 -0300
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- Cc: Leon Romanovsky <leon@xxxxxxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Abdiel Janulgue <abdiel.janulgue@xxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Alex Gaynor <alex.gaynor@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Danilo Krummrich <dakr@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, iommu@xxxxxxxxxxxxxxx, Jason Wang <jasowang@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, kasan-dev@xxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-trace-kernel@xxxxxxxxxxxxxxx, Madhavan Srinivasan <maddy@xxxxxxxxxxxxx>, Masami Hiramatsu <mhiramat@xxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Miguel Ojeda <ojeda@xxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, rust-for-linux@xxxxxxxxxxxxxxx, Sagi Grimberg <sagi@xxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxx, Will Deacon <will@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 23 Sep 2025 22:22:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Sep 23, 2025 at 12:30:55PM -0600, Keith Busch wrote:
> I don't have a system in this state at the moment, so we checked
> previous logs on machines running older kernels. It's extermely
> uncommon, but this error was happening prior to this series, so I don't
> think this introduced any new problem here. I'll keeping looking, but I
> don't think we'll make much progress if I can't find a more reliable
> reproducer.
Okay, that's great. It needs to get resolved but it is not this series
at fault.
Very rare is a different perspective, I mis-thought it was happening
reproducible all the time..
It seems to me it is actually a legitimate thing for userspace to be
able to trigger this cache line debug. If you do concurrent O_DIRECT
to the very same memory it should trigger if I read it right..
So it may not even be an actual bug???
Jason
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