On Tue, Oct 12, 2021 at 11:55 AM Steven Rostedt <rostedt@goodmis.org> wrote:
>
>
> I saved off that warning from a different branch, and looking at the dmesg,
> it is:
>
>   Linux version 5.14.0-rc2-test+
>
> Which shows this happened on 5.14 as well (and explains why the line
> numbers are different).

Ok, yes, that's the exact same "pud_set_huge()" failure.

So it's the same issue, and has been going on for a while, and
presumably very few people end up enabling DEBUG_VM_PGTABLE (together
with it being hard to trigger).

Or it's something specific to your setup, but that sounds unlikely.

You might add some debugging to the x86 pud_set_huge() function,
something like the attached (obviously entirely untested) patch.

           Linus