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

Sebastian Ott
2025-12-09T21:05:36Z

On Tue, 9 Dec 2025, Robin Murphy wrote:
> On 2025-12-09 11:43 am, Sebastian Ott wrote:
>> Hi,
>>
>> 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?
>
> nvme_unmap_data() is attempting to unmap an IOVA that was never mapped, or
> has already been unmapped by someone else. That's a usage bug.

OK, that's what I suspected - thanks for the confirmation!

I did another repro and tried:

good: 44fc84337b6e Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
bad: cc25df3e2e22 Merge tag 'for-6.19/block-20251201' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux

I'll start bisecting between these 2 - hoping it doesn't fork up my root
fs again...

Thanks,
Sebastian