Hi, This is what I have figured out so far.
For some reason the initial probing done by the modesetting driver fails. This is part of the platform device probing stage. This failure means the device is not claimed by the modesetting driver as a 'regular' screen. Instead it is claimed by the fbdev driver. The modesetting driver then claims the platform device as a 'GPU' device. It shouldn't do that: the GPU device init is what causes the crash. What I am still trying to figure out is why the initial probing fails. This is difficult to figure out from the core dump, so I have attached a patch for xorg-server that should help. With this patch I should be able to figure out what part of the probe doesn't go as expected. Please let me know if you have any trouble applying the patch. ** Patch added: "patch to enable extra debugging" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1691991/+attachment/4886582/+files/debug.patch -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1691991 Title: Xorg Segmentation fault on Hisilicon D05 board (arm64) Status in xorg package in Ubuntu: New Bug description: ubuntu@ubuntu:~$ sudo /usr/lib/xorg/Xorg [sudo] password for ubuntu: X.Org X Server 1.18.4 Release Date: 2016-07-19 X Protocol Version 11, Revision 0 Build Operating System: Linux 4.4.0-45-generic aarch64 Ubuntu Current Operating System: Linux ubuntu 4.10.0-20.22-generic #22+pearl.2-Ubuntu SMP Thu Apr 27 20:23:08 UTC 2017 aarch64 Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.10.0-20.22-generic root=UUID=eee681c5-04ce-4cd0-a004-cae6717961ce ro debug earlycon=pl011,mmio,0x602B0000 console=tty0 Build Date: 02 November 2016 10:05:28PM xorg-server 2:1.18.4-0ubuntu0.2 (For technical support please see http://www.ubuntu.com/support) Current version of pixman: 0.33.6 Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/var/log/Xorg.0.log", Time: Fri May 19 18:10:13 2017 (==) Using system config directory "/usr/share/X11/xorg.conf.d" pci id for fd 10: 19e5:1711, driver (null) EGL_MESA_drm_image required. (EE) (EE) Backtrace: (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x58) [0xaaaad7f1cc48] (EE) (EE) Segmentation fault at address 0xa0 (EE) Fatal server error: (EE) Caught signal 11 (Segmentation fault). Server aborting (EE) (EE) Please consult the The X.Org Foundation support at http://wiki.x.org for help. (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information. (EE) (EE) Server terminated with error (1). Closing log file. Aborted (core dumped) ubuntu@ubuntu:~$ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1691991/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
