Dear Kees, dear Andrew,
No idea, if you are aware of it yet, but three people verified that
commit 3202fa62fb (slub: relocate freelist pointer to middle of object)
causes a regression on AMD hardware [1].
It’d be great, if you took a look, and advised if this commit (and
follow-ups) should be reverted, until the issue is analyzed.
Kind regards,
Paul
[1]: https://bugzilla.kernel.org/show_bug.cgi?id=207383
"[Regression] 5.7 amdgpu/polaris11 gpf: amdgpu_atomic_commit_tail"
On Tue, Jul 21, 2020 at 04:55:12PM +0200, Paul Menzel wrote:
> No idea, if you are aware of it yet, but three people verified that commit
> 3202fa62fb (slub: relocate freelist pointer to middle of object) causes a
> regression on AMD hardware [1].
Hi, thanks for emailing; I don't get bugzilla notifications, so I hadn't
seen this yet.
> It’d be great, if you took a look, and advised if this commit (and
> follow-ups) should be reverted, until the issue is analyzed.
There have been a number of fixes to that commit (which I see are
mentioned in a quick skim of the bug), but they've mostly been around
additional slab debugging features. If it's causing a problem outside
of that, my instinct would be there might be a use-after-free happening,
but I'll go read the bug more closely now, and comment there (or here,
if needed).
Thanks!
--
Kees Cook