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[92.176.231.205]) by smtp.gmail.com with ESMTPSA id b17-20020a5d6351000000b0020fee88d0f2sm3262351wrw.0.2022.06.16.12.55.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Jun 2022 12:55:25 -0700 (PDT) Message-ID: <38473dcd-0666-67b9-28bd-afa2d0ce434a@redhat.com> Date: Thu, 16 Jun 2022 21:55:24 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH v6 3/5] fbdev: Disable sysfb device registration when removing conflicting FBs Content-Language: en-US To: Zack Rusin , "linux-kernel@vger.kernel.org" Cc: "linux-fbdev@vger.kernel.org" , "kraxel@redhat.com" , "tzimmermann@suse.de" , "gregkh@linuxfoundation.org" , "alex.williamson@redhat.com" , "dri-devel@lists.freedesktop.org" , "daniel.vetter@ffwll.ch" , "lersek@redhat.com" , "kvm@vger.kernel.org" , "deller@gmx.de" , Linux-graphics-maintainer References: <20220607182338.344270-1-javierm@redhat.com> <20220607182338.344270-4-javierm@redhat.com> From: Javier Martinez Canillas In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Hello Zack, On 6/16/22 21:29, Zack Rusin wrote: > On Tue, 2022-06-07 at 20:23 +0200, Javier Martinez Canillas wrote: >> The platform devices registered by sysfb match with firmware-based DRM or >> fbdev drivers, that are used to have early graphics using a framebuffer >> provided by the system firmware. >> [snip] > > Hi, Javier. > > This change broke arm64 with vmwgfx. We get a kernel oops at boot (let me know if > you'd like .config or just have us test something directly for you): > Yes please share your .config and I'll try to reproduce on an arm64 machine. > > Unable to handle kernel NULL pointer dereference at virtual address > 0000000000000008 > Mem abort info: > ESR = 0x96000004 > EC = 0x25: DABT (current EL), IL = 32 bits > SET = 0, FnV = 0 > EA = 0, S1PTW = 0 > FSC = 0x04: level 0 translation fault > Data abort info: > ISV = 0, ISS = 0x00000004 > CM = 0, WnR = 0 > user pgtable: 4k pages, 48-bit VAs, pgdp=00000001787ee000 > [0000000000000008] pgd=0000000000000000, p4d=0000000000000000 > Internal error: Oops: 96000004 [#1] SMP > Modules linked in: vmwgfx(+) e1000e(+) nvme ahci(+) xhci_pci drm_ttm_helper ttm > sha256_arm64 sha1_ce nvme_core xhci_pci_renesas aes_neon_bs aes_neon_blk aes> > CPU: 3 PID: 215 Comm: systemd-udevd Tainted: G U 5.18.0-rc5-vmwgfx > #12 I'm confused, your kernel version seems to be 5.18.0-rc5 but this patch is only in drm-misc-next now and will land in 5.20... Did you backport it? Can you please try to reproduce with latest drm-tip ? -- Best regards, Javier Martinez Canillas Linux Engineering Red Hat