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Message-ID: <ZRrUjcWqtmzPV3Fs@casper.infradead.org>
Date: Mon, 2 Oct 2023 15:32:45 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Oleksandr Natalenko <oleksandr@...alenko.name>
Cc: linux-kernel@...r.kernel.org, Bagas Sanjaya <bagasdotme@...il.com>,
linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
dri-devel@...ts.freedesktop.org,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Sumit Semwal <sumit.semwal@...aro.org>,
Christian König <christian.koenig@....com>,
Linux Regressions <regressions@...ts.linux.dev>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: Re: [REGRESSION] BUG: KFENCE: memory corruption in
drm_gem_put_pages+0x186/0x250
On Mon, Oct 02, 2023 at 01:02:52PM +0200, Oleksandr Natalenko wrote:
> > > > > BUG: KFENCE: memory corruption in drm_gem_put_pages+0x186/0x250
> > > > >
> > > > > Corrupted memory at 0x00000000e173a294 [ ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ] (in kfence-#108):
> > > > > drm_gem_put_pages+0x186/0x250
> > > > > drm_gem_shmem_put_pages_locked+0x43/0xc0
> > > > > drm_gem_shmem_object_vunmap+0x83/0xe0
> > > > > drm_gem_vunmap_unlocked+0x46/0xb0
> > > > > drm_fbdev_generic_helper_fb_dirty+0x1dc/0x310
> > > > > drm_fb_helper_damage_work+0x96/0x170
>
> Matthew, before I start dancing around, do you think ^^ could have the same cause as 0b62af28f249b9c4036a05acfb053058dc02e2e2 which got fixed by 863a8eb3f27098b42772f668e3977ff4cae10b04?
Yes, entirely plausible. I think you have two useful points to look at
before delving into a full bisect -- 863a8e and the parent of 0b62af.
If either of them work, I think you have no more work to do.
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