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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qnJyX-009YFL-Pv; Mon, 02 Oct 2023 14:32:45 +0000 Date: Mon, 2 Oct 2023 15:32:45 +0100 From: Matthew Wilcox To: Oleksandr Natalenko Cc: linux-kernel@vger.kernel.org, Bagas Sanjaya , linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Sumit Semwal , Christian =?iso-8859-1?Q?K=F6nig?= , Linux Regressions , Andrew Morton , linux-mm@kvack.org Subject: Re: [REGRESSION] BUG: KFENCE: memory corruption in drm_gem_put_pages+0x186/0x250 Message-ID: References: <13360591.uLZWGnKmhe@natalenko.name> <2701570.mvXUDI8C0e@natalenko.name> <2300189.ElGaqSPkdT@natalenko.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2300189.ElGaqSPkdT@natalenko.name> X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 1DB818001F X-Stat-Signature: gztrg6gqa3zdund76w16ubfqpstzhdfz X-Rspam-User: X-HE-Tag: 1696257186-25512 X-HE-Meta: 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 PPqxE3M6 QJAUl8SnlT9RD5U1VwNiVsDSoe7rBl2wAYcpEKMU7zM2uO1VKndgQNM3zBNgdINW6ErpPMPFiQfHyu+winhBhgqXr30EyS2UCyJ7o8GdOZy7a6T9cWp9yIgaH3oFniDvUk3Q9UuhkMsQEDWmhk3Z5eAD3IL2w4KG7+U603o2JmsXDXXupI1fN6H+83w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.