Re: [PATCH v4, RESEND] fs/dax: check zero or empty entry before converting xarray entry

[Seunguk Shin]

Hi Andrew,

Thank you for looking into this.

> Are there any known userspace-visible runtime effects of this?

Yes. I'm trying to fix this because it caused kernel panic on a VM with DAX in
kata-containers project:
https://github.com/kata-containers/kata-containers/commit/1c154b4c15cfc63e06ad1c48a801064677e874e2

I'll add kernel panic message in the commit log like patch v2:
https://lore.kernel.org/all/m2tsvmue92.fsf@xxxxxxx/

Thank you.