On 13.03.24 23:26, Peter Xu wrote:
On Wed, Mar 13, 2024 at 11:03:04PM +0100, David Hildenbrand wrote:
On 13.03.24 22:31, peterx@xxxxxxxxxx wrote:
From: Peter Xu <peterx@xxxxxxxxxx>
Commit 0cf18e839f64 of large folio zap work broke uffd-wp. Now mm's uffd
unit test "wp-unpopulated" will trigger this WARN_ON_ONCE().
Good that I added the WARN_ON_ONCE() :)
To be explict, VM_WARN_ON_ONCE. :) And that's my guess that you didn't hit
it when you posted the series and did the tests, as I know latest distros
like Fedora dropped DEBUG_VM, so maybe you had your base config out of
there (but I normally have it irrelevant of that).
It's rather surprising that this went unnoticed for quite a while. I
usually do run with DEBUG_VM, but I have a bunch of different VMs where
I tests stuff, likely it was off when I ran the selftests.
--
Cheers,
David / dhildenb
