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

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Message-ID: <acb053b0-fc08-91c6-c166-eebf26b5987e@redhat.com>
Date: Wed, 10 Dec 2025 12:08:36 +0100 (CET)
From: Sebastian Ott <sebott@...hat.com>
To: Keith Busch <kbusch@...nel.org>
cc: linux-nvme@...ts.infradead.org, iommu@...ts.linux.dev, 
    linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
    linux-xfs@...r.kernel.org, Jens Axboe <axboe@...com>, 
    Christoph Hellwig <hch@....de>, Will Deacon <will@...nel.org>, 
    Robin Murphy <robin.murphy@....com>, Carlos Maiolino <cem@...nel.org>
Subject: Re: WARNING: drivers/iommu/io-pgtable-arm.c:639

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