Re: WARNING: drivers/iommu/io-pgtable-arm.c:639

[Sebastian Ott]

On Wed, 10 Dec 2025, Keith Busch wrote:
> On Tue, Dec 09, 2025 at 12:43:31PM +0100, Sebastian Ott wrote:
> > got the following warning after a kernel update on Thurstday, leading to a
> > panic and fs corruption. I didn't capture the first warning but I'm pretty
> > sure it was the same. It's reproducible but I didn't bisect since it
> > borked my fs. The only hint I can give is that v6.18 worked. Is this a
> > known issue? Anything I should try?
>
> Could you check if your nvme device supports SGLs? There are some new
> features in 6.19 that would allow merging IO that wouldn't have happened
> before. You can check from command line:
>
>  # nvme id-ctrl /dev/nvme0 | grep sgl

# nvme id-ctrl /dev/nvme0n1 | grep sgl
sgls      : 0xf0002

Thanks,
Sebastian